javascript - jQuery ajax:before event - Stack Overflow

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I've seen some coworkers use this in rails

    $('[data-once=true]').live('ajax:before', function(request, e) {

});

However I'm trying to use it with jquery and it doesnt work, does this event es with the rails jquery adapter?

I've seen some coworkers use this in rails

    $('[data-once=true]').live('ajax:before', function(request, e) {

});

However I'm trying to use it with jquery and it doesnt work, does this event es with the rails jquery adapter?

• javascript
• ruby-on-rails
• ajax
• jquery

Share Follow edited Jan 1, 2011 at 8:24 Nick Craver 631k138138 gold badges1.3k1.3k silver badges1.2k1.2k bronze badges asked Jan 1, 2011 at 2:07 ryudiceryudice 37.5k3333 gold badges120120 silver badges164164 bronze badges

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3 Answers 3

Sorted by: Reset to default 4

Yes, ajax:before is a jQuery event that rails adds/triggers, though in the latest version it's not ajax:beforeSend. In jQuery though (ajax:before was around before the JS framework agnostic changes to rails), you can just attach to this globally, using the ajaxSend global event, like this:

$(document).bind('ajaxSend', function(e, request, options) {
  $('[data-once=true]').something();
});

I'm not a rails dev, so I'm not sure how rails changes this equation, but this is how I'd attach an function to the AJAX before in plain ole' JS:

$.ajax({
   beforeSend: function(){

     alert("Before");

   },
   plete: function(){

    alert("after");

   }
 });

Note that these events are fired for all AJAX requests thereafter. You're essentially subscribing to the AJAX object.

See the jQuery AJAX Events Documentation for more info.

This 'ajax:before' isn't a useful event for .live() to handle, unless you've defined a custom event with that name.

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