20.2. Referring to the Value of a Variable in WML

To refer to the value of a variable in WML, use the form $(variable name). Whenever a WAP browser comes across a term of such form, it will substitute the term with the stored value of the variable.

The WML example below demonstrates how to refer to the value of a variable in a card:


(varEg1.wml)

<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.3//EN" "http://www.wapforum.org/DTD/wml13.dtd">

<wml>
  <card id="card1" title="WML Variable">
    <onevent type="onenterforward">
      <refresh>
        <setvar name="var1" value="variable 1"/>
      </refresh>
    </onevent>
    <p>
      What's your name?
      <input name="name" maxlength="16"/><br/>

      Which part of our WML tutorial do you like?
      <select name="tutorial_part">
        <option value="Part 1">Part 1</option>
        <option value="Part 2">Part 2</option>
        <option value="Part 3">Part 3</option>
      </select><br/><br/>

      <a href="#card2">Next Card</a>
    </p>
  </card>

  <card id="card2" title="WML Variable">
    <p>
      Your name is $(name).<br/><br/>
      You like $(tutorial_part) of our WML tutorial.<br/><br/>
      The value of var1 is <i>$(var1)</i>.

    </p>
  </card>
</wml>


The screenshots below show what you will see if you open the above WML document in some mobile phone browsers:






Sony Ericsson T610





Sony Ericsson T68i





Nokia Mobile Browser 4.0


Type Jack in the input field and then select the Part 2 option of the selection list. The values Jack and Part 2 are assigned to the variables name and tutorial_part respectively.






Sony Ericsson T610





Sony Ericsson T68i





Nokia Mobile Browser 4.0


After selecting the "Next Card" anchor link, the mobile phone browser prints out the values of variables name, tutorial_part and var1 on the screen. You should see something similar to the following screenshots:






Sony Ericsson T610








Sony Ericsson T68i





Nokia Mobile Browser 4.0


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