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<setvar name="i" value="10"/>
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Whenever you create an input element, the results are stored as variables Simply use the name of the element preceded by a dollar sign You can surround the variable name by parentheses to separate it from any other text So, to create a small application that asks the user for their name and then displays it, you could use the following code:
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< xml version="10" > <!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 11//EN" "http://wwwwapforumorg/DTD/wml_11xml">
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<wml> <card id="input"> <input name="myname" size="10"/> <select input="Name:"> </select> <do type="accept" label="OK!"> <go href="#result"/> </do> </card> <card id="result"> <p>Your name is: $(myname)</p> </card> </wml>
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The name is input in the first card (with the id of input) Then the card with the id result is called, as soon as the OK! button is pressed The result is then displayed Images As with HTML, WML does support an <img> tag:
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<img src="mewbmp"/ alt="Me">
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The resultant image might appear as in Figure 47 Figure 47 A beautiful WAP image
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The src attribute points to an image in the WBMP format This format is a special, tiny blackand-white bitmap created to fit snugly on wireless devices NOTE The WAP 20 specification proposes the use of color images The alt attribute lets you substitute a word or phrase instead of an image, for phones or WAP browsers that do not support images There are several tools and plug-ins available at the following Web sites that allow you to convert GIF or BMP images to the WBMP format:
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WBmpCreator http://wwwwbmpcreatorcom
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MobImage http://wwwpywebcom/tools/ Gif2Wbmp http://wwwtowapnet/download/indexphp cmd=gif2wbmp&langue=2 Wbmp Butterfly http://inin-wapavalonhr/zdravko/wbmpflyhtm
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Timers When using WAP, the connection between a mobile phone and the server does not remain persistent between requests If the server needs to send an update to the client, it has no way to do so until the client explicitly requests a new deck Many games and other time-sensitive applications will need to constantly poll the server, asking for any new updates This can be done using a simple WML timer Set the ontimer attribute of the <card> tag to point to the WML page you wish to update You can then use the <timer value="10"/> tag to create the countdown, setting the value in tenths of a second To refresh the WML document every three seconds, simply use the following:
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<card ontimer="testwml"> <timer value="30"/> <p>Some Message</p> </card>
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If you've followed along so far, you've noticed that WML has very limited interactivity on the client side Really, all you can do is display simple text and images, collect a little information via user input forms, and send it all to the server to process Just as HTML has JavaScript (based on the ECMAScript standard), some WML browsers support a special client-side scripting language called WMLScript WMLScript is a much simpler subset of ECMAScript In addition, WMLScript is compiled into bytecode by the WAP gateway before being sent down to the phone WARNING Many WAP Browsers do not support WMLScript Be sure to research your target platform before relying on any client-side scripting Check out the excellent table at http://wwwallnetdevicescom/faq/useragentsphp3 to determine what version of WAP your target device supports WMLScript is used, for the most part, to verify user input before wasting precious time sending it to the server For example, if you ask your game player for his age, a simple WMLScript can be sure the input is indeed a number, isn't negative, and isn't over 200 If the results aren't valid, a dialog box can pop up telling the player to enter a new number In addition, some versions of WMLScript allow you to access special features of the user agent, such as the following:
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Dialog boxes to alert the user of something or to request input Make phone calls Access the SIM card Access or change the address book Configure the phone preferences
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Accessing WML Script WMLScript files are stored separately from WML files They usually have the wmls extension You can access a WMLScript file's WML the same way you would request any other document:
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