exception example


HTML document 

<html>

<head>
<title>example</title>

<SCRIPT>
function generateError() {
 var diputree = parent.frames["diputree"].document.diputree;

 diputree.setValue("blah blah","oops");

 if ( diputree.hasException() ) {
   alert (diputree.getException() );
 }

 if ( diputree.hasException() ) {
   alert ("This can't happen!");
 }

}
</SCRIPT>
</head>

<body>

<form>
<p>generate an error:
<p><input type="button" value="generate" onClick="generateError();">

</form>

</body>
</html>

Explanation

Check if there was an error

  if ( diputree.hasException() ) {

If there was an error then display an alert with the exception

    alert (diputree.getException() );
  }

The next expression can never be true, because the getException() method cleared the exception.

  if ( diputree.hasException() ) {
    alert ("This can't happen!");
  }


diputree documentation © 2000 dipu