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Getting value of selected option in Java Script

Posted on 2007-12-04
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Last Modified: 2008-02-01
I'm trying to get the value of the selected option when a drop down is changed like so;

<select name="months" id="months" onchange="updateMonth();">

However when I change the drop down, the alert says "Undefined"  where it's meant to say "January"

Can someone tell me where I'm going wrong?
function updateMonth() {

	var opIndex = document.book.months.selectedIndex;

	var opValue = new Array(document.book.months.Options);

	alert (opValue[opIndex]);

}

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Question by:Mr_Splash
6 Comments
 
LVL 36

Accepted Solution

by:
Zyloch earned 80 total points
ID: 20406815
Do not create a new array. Instead, do something like this:

<select name="months" id="months" onchange="updateMonth(this);">

Then, you can have

function updateMonth(sel) {
    alert(sel.options[sel.selectedIndex]);
}
0
 
LVL 3

Author Comment

by:Mr_Splash
ID: 20406887
Thanks Zyloch,

But I'm now getting [object HTMLOptionElement]

Implemented exactly as you specified.
0
 
LVL 19

Expert Comment

by:erikTsomik
ID: 20406901
try this
function updateMonth(sel) {
    alert(sel.options[sel.selectedIndex].value);
}
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LVL 63

Assisted Solution

by:Zvonko
Zvonko earned 45 total points
ID: 20406905
Or simplified:

<select name="months" id="months" onchange="updateMonth(this);">

function updateMonth(theSel){
  alert(theSel.value);
}

0
 
LVL 36

Expert Comment

by:Zyloch
ID: 20407015
That's right. I can't believe I forgot the value attribute, thanks for the save.
0
 
LVL 19

Expert Comment

by:erikTsomik
ID: 20407053
that is fine , but got no points anyway.
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