WMLScript » Operators » Conditional

Syntax:

? : ;

The conditional operator is used to assign one of two possible values to an expression based upon the results from a boolean test applied to a specified operand.

The conditional operator is used in the following format:

expression = operand1 ? operand2 : operand3;

This operator behaves as follows:

• A boolean (true or false) test is performed on operand1.
• If the test proves true, the expression is assigned the value of operand2.
• If the test proves false or invalid, the expression is assigned the value of operand3.

  Examples

  Code:

  <?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
"http://www.WAPforum.org/DTD/wml_1.1.xml">
<wml>

<card id="card1">
   <p>
   conditional example
   </p>
   <do type="accept">
      <go href="ConditionalExample.wmls#findconditional()" />
   </do>
</card>

<card id="card2">
<p>
   expression = $(express)
</p>
</card>

</wml>

  Explanation:

  Code for ConditionalExample.wml.

  Language(s): WML

  Code:

  extern function findconditional()
{
   var oper1;
   var oper2 = "second operand";
   var oper3 = "third operand";
   var boo = Dialogs.prompt("true, false, or invalid", "");
   if(boo == "true") oper1 = true;
   if(boo == "false") oper1 = false;
   if(boo == "invalid") oper1 = invalid;
   var exp = oper1 ? oper2 : oper3;
   WMLBrowser.setVar("express", exp);
   WMLBrowser.go("ConditionalExample.wml#card2");
};


  Explanation:

  Code for ConditionalExample.wmls.

  Language(s): WML

  See Also:

  • isvalid
  • Comparison