End a for loop if value is ""

[plumba]

Hi all.

I have a small script which checks a text field on a form against values in a select box, then alert either 'Match' if there is a match or 'no match' if there is no match. However, I would like the script to end if the text field is blank.
The code is:

function compareID(){
 
var idlist = document.getElementById('1stDefinition').options;
var idinput = document.getElementById('existingid');
var match = false;
 
for (i=0; i<idlist.length; i++) {
  if (idlist[i].value.toLowerCase() == idinput.value.toLowerCase()){ match = true;  }
} 
if (match) { alert("match"); } else {
    alert("no match");
    document.Enrolment.existingid.focus();}
 
 
}

And the script os called on an onblur:

[HTML]<input type="text" name="Users_ID" size="10" maxlength="8" style="text-transform: uppercase" id="existingid" onblur=compareID();>[/HTML]

What seems to happen is, if the text field is clicked into and the left blank - the onblur says 'no match' and puts the cursor back in the text field - what it should do - if the text field is blank on blur then the script should just end.

Suggestions?????

[mrhoo]

Don't start the loop if there is no input-

var idinput = document.getElementById('existingid');
if(/^(\w)+$/.test(idinput.value)==false) return;

[pbmods]

Heya, Plumba.

Changed your thread title for you (I'm sure you meant a FOR loop, not an IF loop).

Have a look at the break keyword.

[plumba]

Heya, Plumba.

Changed your thread title for you (I'm sure you meant a FOR loop, not an IF loop).

Have a look at the break keyword.

Many thanks, suggestion worked a treat.

Cheers guys!!

[pbmods]

Heya, Plumba.

Glad to hear you got it working! Good luck with your project, and if you ever need anything, post back anytime :)