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how do i assign an onchange function to a select field within my javascript code?

Posted on 2006-11-02
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Last Modified: 2008-02-07
i want to dynamically assign an onchange function to a select field in my javascript code.

so lets say i have this code:

function eventHandler(param1) {

           doSomeStuff(param1);
}

selectField.onchange=eventHandler("blah");



obviously this is the wrong way, what is the correct way?

selectField.onchange = function() { eventHandler("blah"); }


is this the correct way?





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Question by:wrynn
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Basilisci earned 500 total points
ID: 17862501
This is ok:

selectField.onchange = function() { doSomeStuff("blah"); };

If you don't need to specify any parameters, you can also do

selectField.onchange=eventHandler;

or

selectField.onchange= doSomeStuff;


Another approach is to use addEventListener (allows to attach many listeners on the same event and element):

if (selectField.attachEvent) {
   selectField.attachEvent("onchange", function() { doSomeStuff("blah"); });  // this is for IE
} else {
   selectField.addEventListener("change", function() { doSomeStuff("blah"); }, false); // this for standards-compliant browser
}
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