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How do I intercept all page postbacks in jquery before they occur?

Posted on 2014-12-04
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Last Modified: 2014-12-08
Hi:

I've got of client side processing on a web page which needs to be completed before the page posts back to the server.
There are several operations on the page which could result in a postback, so I would like to universally intercept the postback on the client side before it occurs, complete some processing and proceed with the postback.

What is the best way to do this in jquery?

Thanks,
JohnB
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Question by:jxbma
3 Comments
 
LVL 82

Accepted Solution

by:
leakim971 earned 500 total points
ID: 40481927
var notDone = true;
jQuery(function($) {
   $("form").submit(function(evt) {
       if(notDone) {
           evt.preventDefault();
           // do what you need here SYNCHRONOUSLY, I mean no timer, no Ajax call
           // do what you need here SYNCHRONOUSLY, I mean no timer, no Ajax call
           // do what you need here SYNCHRONOUSLY, I mean no timer, no Ajax call
           // do what you need here SYNCHRONOUSLY, I mean no timer, no Ajax call
           notDone = false;
           $(this).submit();
       }
   });
});

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Expert Comment

by:Hans Langer
ID: 40482875
if you are using $.ajax({..}) you can set the properties off all the calls that you will use with "$.ajax" function.

I.E.:
$.ajax({beforeSend:function(jqXHR,settings){
//DO SOMETHING BEFORE SEND THE DATA TO THE SERVER
}})

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if its only a page that have forms then you can just set the "submit" event of the forms.
$('form').submit(function(){
//your process
//return false to cancel the submit
//return true to proceed with the submit
})

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0
 
LVL 1

Author Closing Comment

by:jxbma
ID: 40487251
Ultimately, this was the solution I chose to go with.

Thx
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