JP2009105780A - Content display device and content display program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a content display device capable of notifying a user that a key event does not occur even though the key is pressed regarding the key with which the key event does not occur using a characteristic of a markup description language. <P>SOLUTION: The content display device can display the content described by a markup language, and can change the contents of the displayed content according to key input by a key input means. The content display device comprises: a determination means for determining whether or not the input of each key of the key input means is valid or invalid based on the contents of the displayed content; and a key state notifying means for notifying the user that the input of each key is valid or invalid based on the determination result by the determination means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a content display device and a content display program for displaying content described in a markup description language.

  In a browser that reproduces content described in a markup description language such as BML (Broadcast Markup Language) used for data broadcasting in terrestrial digital broadcasting, a key event can be generated by a user operation. For example, a key down event occurs when the user presses the enter key, and a key up event occurs when the enter key is released. The user can generate a key event for a specific element and perform a predetermined operation. For example, when the user generates a keydown event for the decision key in the object element with the onkeydown attribute specified, the operation specified by the onkeydown attribute is performed. As a result, document transition or screen update is performed. Note that BML is described in detail in Non-Patent Document 1.

  Usually, a portable / mobile terminal such as a mobile phone having a browser function includes a display control device having a function of performing a focus display in order to perform an operation by key input. Focus display refers to displaying so that the user can determine that an element has been selected by operating the arrow keys while viewing the displayed screen and selecting one of the displayed elements. . An element that is displayed in focus is called a focus element. Further, when an element becomes a focus element, it is said that the element has acquired the focus, and conversely, when it becomes a normal element from the focus element, it is said that the element has lost the focus. When the user presses the enter key, a key down event by the enter key is generated for this focus element.

However, whether or not an event occurs when a key is pressed depends on the content and browser status. That is, there is a case where no display is updated even if the user performs some key operation.
Digital Broadcasting Standard “ARIB STD-B24“ Data Broadcast Coding and Transmission System for Digital Broadcasting ”Standard Edition, March 4, 2007

  The present invention uses a feature of a markup description language to make it possible to notify a user that a key event does not occur for a key that does not generate a key event even if the key is pressed. An object is to provide a display program.

  The invention described in claim 1 is a content display device capable of displaying content described in a markup language and changing the content of the displayed content in response to a key input from a key input means. And determining whether each key input of the key input means is valid or invalid based on the content of the displayed content, and whether each key input is valid based on the determination result by the determination means. It is characterized by comprising key state notifying means for notifying the user of whether or not it is invalid. Here, “changing the content of the displayed content” includes changing the content of the document structure obtained by analyzing the BML document in addition to changing the content displayed on the screen.

  According to a second aspect of the present invention, in the content display device according to the first aspect, the determination means is a key input means based on “the value of the used-key-list characteristic of the body element included in the displayed content”. It is characterized in that it is determined whether the input of each key is valid or invalid.

  According to a third aspect of the present invention, in the content display device according to the first aspect, the determining means includes “the value of the used-key-list characteristic of the body element included in the displayed content” and “the focus on the displayed content”. It is characterized in that whether or not the input of each key of the key input means is valid or invalid is determined based on whether or not there is an element having “.”

  According to a fourth aspect of the present invention, in the content display device according to the first aspect, the determination means includes “the value of the used-key-list characteristic of the body element included in the displayed content”, “the focus on the displayed content”. Input of each key of the key input means is valid based on "whether there is an element that has an accesskey attribute" and "the value of the accesskey attribute when there is an element having an accesskey attribute in the displayed content" It is characterized in that it is determined whether or not it is invalid.

  According to a fifth aspect of the present invention, in the content display device according to any one of the third to fourth aspects, the determination unit further includes: “the focus element” when there is an element having a focus on the displayed content. It is characterized in that it is determined whether the input of each key of the key input means is valid or invalid in consideration of the attribute designated by “.

  According to a sixth aspect of the present invention, in the content display device according to any one of the third to fourth aspects, the determination unit further includes: “the focus element” when there is an element having a focus on the displayed content. It is characterized in that it is determined whether the input of each key of the key input means is valid or invalid in consideration of the “attribute specified in” and “the type of the focus element”.

  According to a seventh aspect of the present invention, in the content display device according to the first aspect, in the content being displayed, the determination means is “when the used-key-list characteristic of the body element does not include“ basic ”” , "When there is no element that has the focus", or "When there is an element that has the focus but the focus element is not in a state to acquire the key event of the enter key" In this case, there is provided means for determining that the determination key is invalid.

  The case where the focus element is not in a state of acquiring the key event of the determination key means a case where none of the href attribute, onkeydown attribute, onkeyup attribute, and onclick attribute is effectively specified for the focus element.

  The invention according to claim 8 is the content display device according to claim 1, wherein the determination unit is configured such that “when there is no element having focus” or “with focus” in the displayed content. But the focus element is not an element related to character input and the body element used-key-list property does not contain "basic" or "the element has the focus" But if the focus element is not an element related to character input and the body element's used-key-list property contains "basic", but the focus element is not in a state to get the key event of the decision key " And a means for determining that the determination key is invalid.

  The element related to the character input is, for example, an input element or a textarea element.

  According to the ninth aspect of the present invention, in the content display device according to the first aspect of the present invention, the determination unit is configured such that “basic” is not included in the used-key-list characteristic of the body element in the displayed content. Or “corresponds to the case where there is no element that has focus, or there is an element that has focus, but the focus element is not in a state of acquiring the key event of the return key, and In the case where there is no element in which the accesskey attribute corresponding to the return key is specified, means for determining that the return key is invalid is provided.

  The case where the focus element is not in a state of acquiring the key event of the return key means that neither the onkeydown attribute nor the onkeyup attribute is effectively specified for the focus element.

  According to a tenth aspect of the present invention, in the content display device according to the first aspect, the determination means does not include “numeric-tuning” in the “used-key-list characteristic of the body element” in the displayed content. ”Or“ when there is no element that has the focus, or there is an element that has the focus, but the focus element is not in a state to acquire a key event of a numeric key. And means for determining that the numeric key is invalid when there is no element in which the accesskey attribute corresponding to the numeric key is specified.

  The case where the focus element is not in the state of acquiring the key event of the numeric key means a case where neither the onkeydown attribute nor the onkeyup attribute is effectively specified for the focus element.

  According to the eleventh aspect of the present invention, in the content display device according to the first aspect, the determination means does not include “special-1” in the used-key-list characteristic of the body element in the displayed content. ”Or“ when there is no element that has the focus, or there is an element that has the focus but the focus element is not in a state to acquire the key event of the symbol key. And means for determining that the symbol key is invalid when there is no element in which the accesskey attribute corresponding to the symbol key is specified.

  The case where the focus element is not in a state of acquiring the key event of the symbol key means a case where neither the onkeydown attribute nor the onkeyup attribute is effectively specified for the focus element.

  According to a twelfth aspect of the present invention, in the content display device according to the first to eleventh aspects, the key input means is a touch panel, and the key state notification means changes the display mode of the soft keys displayed on the touch panel. In this way, the user is notified whether the input of each key of the key input means is valid or invalid.

  According to a thirteenth aspect of the present invention, in the content display device according to the first to eleventh aspects, the key input means is composed of one or a plurality of hard keys, and the key state notifying means controls the backlight of the hard keys. In this way, the user is notified whether the input of each key of the key input means is valid or invalid.

  According to a fourteenth aspect of the present invention, there is provided a content display program for displaying content described in a markup language and changing the content of the displayed content in response to a key input from a key input unit. In addition, the computer determines whether each key input of the key input means is valid or invalid based on the content of the displayed content, and each key is determined based on the determination result by the determination means. It is characterized by functioning as a key state notifying means for notifying the user whether it is valid or invalid.

  According to the present invention, for a key that does not generate a key event, the user can be notified that a key event does not occur even if the key is pressed.

  Hereinafter, with reference to the drawings, an embodiment in which the present invention is applied to a mobile terminal having a function of receiving digital terrestrial television broadcasting and a car navigation function will be described.

[1] Configuration of Mobile Terminal FIG. 1 shows a configuration of a mobile terminal having a function of receiving digital terrestrial television broadcasting and a car navigation function. However, since the feature of this embodiment is the key valid / invalid display method in the case of displaying a data broadcast transmitted by terrestrial digital television broadcast, in FIG. The circuit is omitted.

  A broadcast wave received by the antenna 1 is sent to the tuner 2, subjected to high frequency processing and demodulation, and output as a transport stream. The DEMUX circuit 3 analyzes the transport stream received by the tuner 2 and decomposes it into an AV stream, program information, and a BML document. The AV stream is sent to the AV decoder 4, and the program information and the BML document are sent to the system control unit 20.

  The AV decoder 4 decodes the AV stream. The video signal obtained by the AV decoder 4 is sent to an LCD (liquid crystal display) 8 through a video processing circuit 5, a multiplexer 6 and a video output circuit 7. The audio signal obtained by the AV decoder 4 is sent to the speaker 11 via the audio processing circuit 9 and the audio output circuit 10.

  The system control unit 20 controls each unit of the mobile terminal. An operation unit 21 is connected to the system control unit 20. In this embodiment, the operation unit 21 includes a touch panel formed on the LCD 8.

  The system control unit 20 analyzes the BML document separated by the DEMUX circuit 3, and controls the graphic display circuit 22 so that display according to the analysis result is performed. The graphic signal generated by the graphic display circuit 22 is sent to the multiplexer 6 and synthesized with the video signal. The video signal obtained by the multiplexer 6 is sent to the LCD 8 via the video output circuit 7.

[2] Embodiment of the Present Invention FIG. 2 shows an example of a display screen of terrestrial digital television broadcasting.

  In this example, the display screen includes a television program display area Q1 at the upper left, a program information display area Q2 below the area Q1, a browser area Q3 on the right side of these areas Q1 and Q2, and a button display area Q4 at the bottom of the screen. Is provided. Data broadcast content is displayed in the browser area Q3.

  As shown in FIG. 2, in this embodiment, various operation keys are displayed as soft keys in the screen. Here, the soft key refers to a button arranged in the screen. In this example, a soft key switching button 101 is displayed in the program information display area Q2. In the button display area Q4, a video button 201, a data menu button 202, a number / symbol button 203, a return button 204, a determination button 205, an up movement button 206, and a down movement button 207 are displayed.

  When the numeric / symbol button 203 is pressed, numeric buttons 0 to 9 and symbol buttons * and # are displayed as shown in FIG. The screen of FIG. 3 is referred to as a number / symbol operation screen. On the number / symbol operation screen, the number / symbol button 203 is changed to a basic operation button 208. When the basic operation button 208 is pressed, the display screen of FIG. 2 is displayed.

  In digital terrestrial television broadcasting for mobile / mobile terminals, the keys that can issue key events that can be acquired are “decision key”, “return key”, “numeric keys (0-9)”, “* key”, “# Key” and “TV link key” are defined. The “* key” and “# key” are collectively referred to as the “symbol key”.

  In this embodiment, since there is no space for arranging the “numeric key”, “* key”, and “# key” in the screen, as shown in FIG. When the symbol button 203 is displayed and the user depresses the number / symbol button 203, a number / symbol operation screen as shown in FIG. 3 is displayed.

  Among the buttons displayed in FIG. 2, the object of the present invention is a decision button 205 for issuing a “decision key” key event and a return for issuing a “return key” key event. A number / symbol button 203 for displaying a button 204 and buttons (numeric buttons and symbol buttons in FIG. 3) for issuing key events of “numeric key”, “# key”, and “* key”.

  In this embodiment, it is determined whether each of the decision button 205, the return button 204, and the number / symbol button 203 is valid or invalid based on the content being displayed, and whether each button is valid. The display mode of the button is controlled so that the user can identify whether it is invalid.

  As shown in FIG. 4, a display for identifying whether each soft key is valid or invalid is a display that allows the user to determine at a glance whether or not the soft key (button) can be pressed. And In the example of FIG. 4, only the number / symbol button 203 among the buttons 201 to 207 is invalid. In other words, in this example, when the soft key is valid, the character portion in the button is displayed in white, but when the soft key is invalid, the character portion in the button is displayed in the same black as the background. Is done.

[3] Embodiment 1

  In the first embodiment, based on the value of the used-key-list characteristic used in the BML document, it is determined whether each of the decision button 205, the return button 204, and the number / symbol button 203 is valid or invalid. “Used-key-list” designates a key type to be accepted by the BML browser, and the values shown in Table 1 are used in terrestrial digital television broadcasting for portable / mobile terminals.

  For example, when only “basic” is included in the value of the used-key-list characteristic, the content acquires a key event only when the “decision key” and the “return key” are pressed. Conversely, even if the “numeric key”, “# key”, and “* key” are pressed, the content does not acquire a key event. In the first embodiment, for example, when only “basic” is included in the value of the used-key-list characteristic, numbers for issuing key events of “numeric key”, “# key”, and “* key” The / symbol button 203 is disabled.

  In other words, in the first embodiment, a button for issuing a key event of a key that is not included as a key type that should be accepted by the BML browser by “used-key-list” is disabled.

[4] Embodiment 2

  In the second embodiment, each of the enter button 205, the return button 204, and the number / symbol button 203 is valid based on the value of the used-key-list characteristic used in the BML document and the presence / absence of an element having focus. Determine if it is present or invalid.

  FIG. 5 is a data broadcast display screen in which only the browser area S3 of FIG. 2 is extracted. FIG. 5A shows a data broadcast screen when there is no focus element, and FIG. 5B shows a data broadcast screen when there is a focus element. As shown in FIG. 5A, when there is no focus element, there is naturally no element for acquiring a key event.

Therefore, even if the key is included as a key type that should be received by the BML browser by “used-key-list”, if the focus element does not exist, the key is displayed invalid. That is, when there is no focus element, a determination button 205 and a return button 204 for issuing key events of “decision key”, “return key”, “numeric key”, “# key”, and “* key”. The number / symbol button 203 is disabled.
[5] Embodiment 3

  In the third embodiment, the determination is made based on the value of the used-key-list characteristic used in the BML document, the presence / absence of an element having a focus, and the presence / absence of an element having an accesskey attribute for making an access key available. It is determined whether each of the button 205, the return button 204, and the number / symbol button 203 is valid or invalid.

  In the third embodiment, the same key validity / invalidity determination as in the second embodiment is performed. However, in the third embodiment, when there is an element having an accesskey attribute for making an access key available, access is performed. The button corresponding to the key is displayed effectively.

  An access key is a key event issued by a “decision key” for an element when a corresponding key event is issued, simultaneously with the focus movement to the element for which the accesskey attribute is specified. If there is an element in the content that has an accesskey attribute value that can obtain a key event for a key, enable the key for issuing the key event. For example, if the value indicating the access key for the “return key” is “X”, and there is an element whose accesskey attribute value is “X” in the content, the key event of the “return key” is sent. The return button 204 for issuing is valid display.

  For example, suppose that the BML document for data broadcasting display of FIG. 5B is FIG. In FIG. 6, the bml: accesskey attribute is specified in the object element corresponding to the image displayed as “return to top page”. In this case, since the object element acquires a key event based on the “return key” regardless of the state of the browser, the return button 204 for issuing the “return key” key event becomes effective display.

[6] Embodiment 4

  In the fourth embodiment, in the key validity / invalidity determination in the second or third embodiment, when there is an element having a focus, the attribute specified for the focus element and the type of the focus element are further set. Consider key validity / invalidity.

  In terrestrial digital television broadcasting and terrestrial digital radio broadcasting for portable / mobile terminals, an element that can be a focus element is “one or more attributes of the href attribute, onclick attribute, onkeydown attribute, and onkeyup attribute are designated a” Element "," onclick attribute, onkeydown attribute, onkeyup attribute, bml: onfocus attribute, bml: onblur attribute object element with one or more attributes "," input element ", and" textarea element " Either. However, not all key events can be acquired even with a focus element.

  Only the href attribute, the onclick attribute, the onkeydown attribute, and the onkeyup attribute can acquire the key event by the “decision key”. That is, when none of the href attribute, onclick attribute, onkeydown attribute, and onkeyup attribute is specified as the attribute of the focus element, the content does not acquire a key event even if the “decision key” is pressed. In the fourth embodiment, in such a case, the determination button 205 for issuing a “decision key” key event is disabled.

  Only the onkeydown attribute and the onkeyup attribute can acquire the key event by the “return key”, “numeric key”, “# key”, and “* key”. If neither the onkeydown attribute nor the onkeyup attribute is specified in the attribute of the focus element, the content will not acquire a key event even if the “return key”, “number key”, “# key”, “* key” is pressed . In the fourth embodiment, in such a case, the return button 204 and the number / symbol button 203 for issuing key events of “return key”, “number key”, “# key”, and “* key” are displayed as invalid. Become. However, as described in the third exemplary embodiment, when the value indicating the “return key” is included in the value of the accesskey attribute, the return button 204 is enabled. Similarly, when the value indicating the “numeric key”, “# key”, or “* key” is included in the value of the accesskey attribute, the numeric / symbol button 203 is effectively displayed. .

  For example, suppose that the BML document for data broadcasting display of FIG. 5B is FIG. Since "basic" and "numeric-tuning" are included in the value of "used-key-list", the key event by "decision key", "return key", "numeric key" can be used as content It is. From the above-described condition of the focusable element, the elements that can have the focus in FIG. 7 are four a elements and two object elements. In the display screen of FIG. 5B, the character strings of “weather”, “sports”, “news”, and “program information” correspond to four “a” elements, and return to the “note image” and “top page”. The “displayed image” corresponds to two object elements.

  Only the href attribute is specified for these four a elements. That is, these four a elements acquire only the key event by the “decision key”. Therefore, when any of these four a elements is the focus element, the determination button 205 for issuing the “decision key” key event is displayed effectively, and the “return key” and “number key” key events are issued. The return button 204 and the number / symbol button 203 for displaying are invalid. However, as described in the third embodiment, when there is an element having an accesskey attribute for making an access key available, the return button 204 and the number / symbol button 203 may be displayed effectively.

  Only the bml: onfocus attribute is specified in the object element corresponding to “note image”. That is, this object element does not acquire any key event. Therefore, when the object element is a focus element, the determination button 205, the return button 204, and the number / symbol button 203 for issuing the “decision key”, “return key”, and “numeric key” key events are invalidated. Become. However, as described in the third embodiment, when there is an element having an accesskey attribute for making an access key available, the return button 204 and the number / symbol button 203 may be displayed effectively.

  Only the onkeydown attribute is specified for the “image displayed when returning to the top page”. That is, this object element acquires a key event based on a “decision key”, “return key”, and “numeric key”. Therefore, when this object element is a focus element, the enter button 205, the return button 204, and the number / symbol button 203 for issuing a key event by the “decision key”, “return key”, and “number key” are valid. Display.

  When the focus element is an input element or textarea element, and the mobile / mobile terminal where the character input application is activated by pressing the “decision key”, if the focus element is an input element or textarea element, The decision button 205 for issuing a key event based on the “decision key” needs to be displayed in an effective manner.

[5-1] The following describes the validity / invalidity determination processing for “decision key”, “return key”, “numeric key”, and “symbol key” executed by the system control unit 20.

  The system control unit 20 displays the determination button 205 as valid when it is determined that the “decision key” is valid, and displays the determination button 205 as invalid when it is determined that the “decision key” is invalid. Further, the system control unit 20 displays the return button 204 as valid when it is determined that the “return key” is valid, and displays the return button 204 as invalid when it is determined that the “return key” is invalid. When the system control unit 20 determines that at least one of the “number key” and the “symbol key” is valid, the number / symbol button 203 is displayed as valid, and the “number key” and the “symbol key” are displayed. If both are invalid, the number / symbol button 203 is invalidated. When the number / symbol button 203 is displayed while the number / symbol button 203 is pressed down to display the number / symbol operation screen shown in FIG. The numeric buttons are displayed as valid / invalid according to the invalidity determination result, and the symbol buttons are displayed as valid / invalid according to the validity / invalidity determination result of the “symbol key”.

  FIG. 8 shows the procedure of the validity / invalidity determination process for the “decision key”.

  This process is executed when “the contents displayed on the screen are changed” and “when the contents of the document structure obtained by analyzing the BML document are changed”. The same applies to the validity / invalidity determination processing for other keys.

  “When the content displayed on the screen is changed” means that a document transition occurs and the BML document displayed on the screen is changed, or even if the same BML document is being displayed, When the change occurs, specifically, the focus element is changed or the focus element disappears. “When the content of the document structure obtained by analyzing the BML document is changed” refers to the case where the value of the document structure obtained by analyzing the BML document is changed by the script. Even if the value of the document structure is changed, the screen display is not necessarily changed. For example, even if the value of the used-key-list property is changed, the screen display is not changed.

  First, it is determined whether or not a focus element exists (step S1). If it is determined that the focus element does not exist, it is determined that the “decision key” is invalid (step S6). In this case, the enter button 205 is displayed invalid.

  If it is determined in step S1 that the focus element exists, it is determined whether or not the focus element is an input element or a textarea element (step 2). When it is determined that the focus element is the input element or the textarea element, it is determined that the “decision key” is valid (step S5). In this case, the determination button 205 is displayed effectively.

  If it is determined in step S2 that the focus element is neither an input element nor a textarea element, it is determined whether or not “basic” is included in the value of the used-key-list characteristic (step S3). . When it is determined that “basic” is not included in the value of the used-key-list characteristic, it is determined that the “decision key” is invalid (step S6). In this case, the enter button 205 is displayed invalid.

  In step S3, when it is determined that the value of the used-key-list characteristic includes “basic”, the focus element is in a state of acquiring a key event of “decision key” (with respect to the focus element). It is determined whether or not at least one of href attribute, onclick attribute, onkeydown attribute, and onkeyup attribute is designated (step S4). If it is determined that the focus element is in a state of acquiring the “decision key” key event, it is determined that the “decision key” is valid (step S5). In this case, the determination button 205 is displayed effectively.

  If it is determined in step S4 that the focus element is not in a state of acquiring the “decision key” key event, it is determined that the determination key is invalid (step S6). In this case, the enter button 205 is displayed invalid.

  FIG. 9 shows the procedure of the validity / invalidity determination process for the “return key”.

  First, it is determined whether or not “basic” is included in the value of the used-key-list characteristic (step S11). When it is determined that “basic” is not included in the value of the used-key-list characteristic, it is determined that the “return key” is invalid (step S16). In this case, the return button 204 is displayed invalid.

  In step S11, if it is determined that the value of the used-key-list characteristic includes “basic”, it is determined whether or not there is an element in which the accesskey attribute corresponding to the “return key” is specified. (Step S12). Specifically, it is determined whether or not there is an element for which the value “X” corresponding to the “return key” is specified as the value of the accesskey attribute. If it is determined that there is an element for which the accesskey attribute corresponding to the “return key” is specified, it is determined that the “return key” is valid (step S15). In this case, the return button 204 is effectively displayed.

  If it is determined in step S12 that there is no element for which the accesskey attribute corresponding to the “return key” is specified, it is determined whether or not a focus element exists (step S13). If it is determined that there is no focus element, it is determined that the “return key” is invalid (step S16). In this case, the return button 205 is displayed invalid.

  If it is determined in step S13 that the focus element is present, the focus element is in a state of acquiring a “back key” key event (at least one of the onkeydown attribute and the onkeyup attribute is valid for the focus element). It is determined whether or not (step S14). When it is determined that the focus element is not in a state of acquiring the key event of “return key”, it is determined that the “return key” is invalid (step S16). In this case, the return button 204 is displayed invalid.

  If it is determined in step S14 that the focus element is in a state of acquiring the key event “return key”, it is determined that the “return key” is valid (step S15). In this case, the return button 204 is effectively displayed.

  FIG. 10 shows the procedure of the validity / invalidity determination process for the “numeric key”.

  First, it is determined whether or not “numeric-tuning” is included in the value of the used-key-list characteristic (step S21). When it is determined that “numeric-tuning” is not included in the value of the used-key-list characteristic, it is determined that the “numeric key” is invalid (step S26).

  If it is determined in step S21 that the used-key-list characteristic value includes “numeric-tuning”, whether or not there is an element for which the accesskey attribute corresponding to the “numeric key” is specified. Is determined (step S22). Specifically, it is determined whether or not there is an element in which a value corresponding to the “numeric key” (any one of values corresponding to 0 to 9) is specified as the value of the accesskey attribute. If it is determined that there is an element for which the accesskey attribute corresponding to the “number key” is specified, it is determined that the “number key” is valid (step S25).

  If it is determined in step S22 that there is no element for which the accesskey attribute corresponding to the “numeric key” is specified, it is determined whether or not a focus element exists (step S23). If it is determined that the focus element does not exist, it is determined that the “numeric key” is invalid (step S26).

  If it is determined in step S23 that the focus element is present, the focus element is in a state of acquiring a “numeric key” key event (at least one of the onkeydown attribute and the onkeyup attribute is valid for the focus element). It is determined whether it is specified (step S24). If it is determined that the focus element is not in a state of acquiring the key event of “number key”, it is determined that the “number key” is invalid (step S26).

  If it is determined in step S24 that the focus element is in a state of acquiring a key event of “numeric key”, it is determined that the “numeric key” is valid (step S25).

  FIG. 11 shows the procedure of the validity / invalidity determination process for the “symbol key”.

  First, it is determined whether or not “special-1” is included in the value of the used-key-list characteristic (step S31). If it is determined that “special-1” is not included in the value of the used-key-list characteristic, it is determined that the “symbol key” is invalid (step S36).

  If it is determined in step S31 that the value of the used-key-list characteristic includes “special-1”, whether or not there is an element for which the accesskey attribute corresponding to the “symbol key” is specified. Is discriminated (step S32). Specifically, it is determined whether or not there is an element for which the value corresponding to the “symbol key” (any one of the values corresponding to * and #) is specified as the value of the accesskey attribute. If it is determined that there is an element for which the accesskey attribute corresponding to the “symbol key” is specified, it is determined that the “symbol key” is valid (step S35).

  If it is determined in step S32 that there is no element for which the accesskey attribute corresponding to the “symbol key” is specified, it is determined whether or not a focus element exists (step S33). If it is determined that the focus element does not exist, it is determined that the “symbol key” is invalid (step S36).

  If it is determined in step S33 that the focus element is present, the focus element is in a state of acquiring a “symbol key” key event (at least one of the onkeydown attribute and the onkeyup attribute is valid for the focus element). It is determined whether or not (step S34). If it is determined that the focus element is not in a state of acquiring the “symbol key” key event, it is determined that the “symbol key” is invalid (step S36).

  If it is determined in step S34 that the focus element is in a state of acquiring a “symbol key” key event, it is determined that the “symbol key” is valid (step S35).

  In the above embodiment, the operation unit (key input means) 21 is a touch panel and each operation key is a soft key. However, each operation key may be a hard key. When each operation key is a hard key, whether the key is valid or invalid may be identified by, for example, the on / off state of the backlight of the hard key. The key name or the like may be separately displayed on the display unit for identification.

It is a block diagram which shows the structure of the mobile terminal provided with the function to receive terrestrial digital television broadcasting, and a car navigation function. It is a schematic diagram which shows the example of a display screen of terrestrial digital television broadcasting. FIG. 3 is a schematic diagram showing a number / symbol input screen displayed when a number / symbol button 203 on the display screen of FIG. 2 is pressed. It is a schematic diagram which shows the example in which only the number / symbol button 203 is invalidly displayed among the buttons 201-207. It is a schematic diagram which shows the example of a data broadcast screen when a focus element does not exist, and the example of a data broadcast screen when a focus element exists. It is a schematic diagram which shows an example of the BML document for the display of the data broadcast of FIG.5 (b). It is a schematic diagram which shows an example of the BML document for the display of the data broadcast of Fig.5 (a). It is a flowchart which shows the procedure of the validity / invalidity determination process with respect to a "decision key". It is a flowchart which shows the procedure of the validity / invalidity determination process with respect to a "return key". It is a flowchart which shows the procedure of the valid / invalid determination process with respect to a "numeric key". It is a flowchart which shows the procedure of the validity / invalidity determination process with respect to a "symbol key".

Explanation of symbols

1 Antenna 2 Tuner 3 DEMUX Circuit 4 AV Decoder 5 Video Processing Circuit 6 Multiplexer 7 Video Output Circuit 8 LCD (Liquid Crystal Display)
9 Audio processing circuit 10 Audio output circuit 11 Speaker 20 System control unit 21 Operation unit 22 Graphic display circuit

Claims (14)

A content display device capable of displaying content described in a markup language and changing the content of the displayed content in response to a key input from a key input means,
Based on the content of the content being displayed, the determination means for determining whether the input of each key of the key input means is valid or invalid, and the input of each key is valid based on the determination result by the determination means Key status notification means for notifying the user of whether or not it is invalid,
A content display device comprising: The determination means determines whether the input of each key of the key input means is valid or invalid based on “the value of the used-key-list characteristic of the body element included in the displayed content”. The content display device according to claim 1. The determination means is a key input means based on “the value of the used-key-list characteristic of the body element included in the displayed content” and “whether there is an element having a focus on the displayed content”. The content display device according to claim 1, wherein the input of each key is determined to be valid or invalid. The judging means are “the value of the used-key-list characteristic of the body element included in the displayed content”, “whether there is an element having a focus on the displayed content”, and “the displayed content The key input means determines whether each key input is valid or invalid based on the value of the access key attribute when there is an element having the access key attribute. 2. The content display device according to 1. When there is an element that has focus in the displayed content, the determination means further considers the “attribute specified for the focus element” and the input of each key of the key input means is valid. 5. The content display device according to claim 3, wherein the content display device determines whether the content is invalid or invalid. If there is an element that has focus in the content being displayed, the determination means further considers the “attributes specified for the focus element” and the “type of the focus element” and key input 5. The content display apparatus according to claim 3, wherein the input of each key of the means is determined to be valid or invalid. In the displayed content, the judging means is “when the“ basic ”is not included in the used-key-list characteristic of the body element”, “when there is no element with focus”, or “with focus”. A means for determining that the determination key is invalid when any of the elements is present but the focus element is not in a state of acquiring the key event of the determination key. The content display device according to claim 1, wherein In the content being displayed, the determination means is “when there is no element with focus” or “the element with focus exists but the focus element is not an element related to character input and the body element Used-key-list property does not include "basic" "or" There is an element that has focus, but the focus element is not an element related to character input, and the used-key of the body element When "-basic" is included in the -list property but the focus element is not in a state to acquire the key event of the enter key ", it is provided with means for determining that the enter key is invalid. The content display device according to claim 1. In the content being displayed, the judging means is “when the“ basic ”is not included in the used-key-list characteristic of the body element” or “when there is no element that has the focus or there is a focus. If there is an element that exists but the focus element is not in a state to get the key event of the return key, and there is no element with the accesskey attribute corresponding to the return key ", 2. The content display device according to claim 1, further comprising means for determining that the return key is invalid. In the content being displayed, the judging means is “when the“ numeric-tuning ”is not included in the used-key-list characteristic of the body element” or “when there is no element that has the focus or the focus is When there is an element that has, but the focus element is not in the state to acquire the key event of the numeric key, and there is no element with the accesskey attribute corresponding to the numeric key The content display device according to claim 1, further comprising means for determining that the numeric key is invalid. In the content being displayed, the judgment means is “if the element used-key-list property does not contain“ special-1 ”” or “if the element that has focus does not exist or the focus is When there is an element that has it but the focus element is not in a state to acquire the key event of the symbol key, and there is no element with the accesskey attribute corresponding to the symbol key The content display device according to claim 1, further comprising means for determining that the symbol key is invalid. The key input means is a touch panel, and the key status notification means determines whether each key input of the key input means is valid or invalid by changing the display state of the soft keys displayed on the touch panel. The content display apparatus according to claim 1, wherein the content display apparatus is configured to notify a user. The key input means is composed of one or a plurality of hard keys, and the key status notification means controls whether the input of each key of the key input means is valid or invalid by controlling the backlight of the hard key. The content display apparatus according to claim 1, wherein the content display apparatus is configured to notify a user. In order to display the content described in the markup language and change the content of the displayed content in response to the key input from the key input means, the computer is
Based on the contents of the content being displayed, a determination means for determining whether the input of each key of the key input means is valid or invalid, and whether each key is valid or invalid based on the determination result by the determination means A key state notification means for notifying the user of whether or not
Content display program to function as

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