Catch that error : throw « Language Basics « JavaScript DHTML






  1. JavaScript DHTML
  2. Language Basics
  3. throw

Catch that error

   
<HTML>
<HEAD>
<TITLE>Catch that error!</TITLE>
<SCRIPT>
function catchError(errString) {
   try {
      try {
         if (errString == -1)
            throw new Error (-1, "errString is -1!");
         else
            throw new Error (0, "errString is NOT -1!");
      }
      catch(e) {
         if (e.number == -1)
            return (e.description + " Got this one!");
         else
            throw e;
      } 
   }
   catch (e){
      return(e.description + " This one not handled here!");
   } 
}
</SCRIPT>
</HEAD>
<BODY>
<FORM name="theForm">
<INPUT type=text name=errText value="-1">
<INPUT type=button name=btnThrow value="Catch it!" onClick="alert(catchError(document.theForm.errText.value));">
</FORM>  
</BODY>
</HTML>








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