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:

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.

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:

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