Solved

Getting value of selected option in Java Script

Posted on 2007-12-04
6
777 Views
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]);
}

Open in new window

0
Comment
Question by:Mr_Splash
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
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);
}
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
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.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
How to combine and minify CSS and JS files 5 39
Print Rhino Java Array in Javascript 1 34
Send form to asp server side 6 26
Read text on Table 7 27
Introduction HTML checkboxes provide the perfect way for a web developer to receive client input when the client's options might be none, one or many.  But the PHP code for processing the checkboxes can be confusing at first.  What if a checkbox is…
Nothing in an HTTP request can be trusted, including HTTP headers and form data.  A form token is a tool that can be used to guard against request forgeries (CSRF).  This article shows an improved approach to form tokens, making it more difficult to…
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

756 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question