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Jquery Ajax - on change event not being picked up

Stephen Forlance
on
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Last Modified: 2017-04-27
Hello All,

http://www.dnx.org/mep/form2.php

I have a simple form, when the select box changes if uses an AJAX method and jquery to retrieve another question and display  it.

You can see it by selecting "Bird" as the pet, and then "This year" for when you bought it.

However, if the select box has been created by the ajax query it then does not trigger further ajax calls when its changed.  (In the example given, it should display a further question when "This year" is selected.

Any ideas how I can get it working?

Thanks
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Jeffrey Dake Senior Director of Technology
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Commented:
Yeah, the issue is that when you function initially runs the jquery binds to all the elements on the page.  When you ajax in something new it doesn't look at it again.  You have two options.  Re include the JavaScript when you run your ajax, or a better one you can use the on function and use event-delegation.

Something like

$( "#form" ).on( "change", "select", function() {
  // your function here
});

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instead of what you have with
$('#form select').change(function() {

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For more info look here: http://api.jquery.com/on/
HainKurtSr. System Analyst
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Commented:
try

$('#form select').change(function() {

>>>

$('#form select').on ('change', function() {

Author

Commented:
Hi all,
changing to  $('#form select').on ('change', function() {

did not work

Author

Commented:
Is there a way I could wrap this in a JS function and then call it via an onchange in the select tag?
Jim RiddlesPrepress/OMS Specialist
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Commented:
Stephen,

When I browse to the page you referenced in your post, I can see from the console that it is binding the event to your new choices, and firing when I make changes.  What is not working?
Jeffrey Dake Senior Director of Technology
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Commented:
I don't know if I clarified enough what I was proposing in my above comment.  I was proposing switching to

$( "#form" ).on( "change", "select", function() {

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The key part about this is that it has two selectors.  The outer one "#form" is the selector to a wrapper element that is always on the page.  The "select" is the selector to the element you are trying to have the change event listened for.  By doing it this way, any new "Select" element that is added within the form will process the change event.  

Hope this helps.

Author

Commented:
Thanks guys, its now working.

One final question, how would I set it up to bind both select and radio fields?

$( "#form" ).on( "change", "select", function() {
Senior Director of Technology
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Commented:
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