jQuery “live” event

jQuery 1.3 has a brand new and powerful event. It was very painful and a nightmare to maintain events for newly created elements. For example if you define “click” event for existing elements at domready it won’t work for dynamically added elements later. Each time a new element is added you had to bind the event to that element. Which results in many recursive function calls, for huge applications so tough to maintain the events dynamically and finally not efficient coding structure.

The new “live” event has made our life easier to a great extent!

For example:

$("a").bind("click", function(){$(this).blur();});

  This simple code will remove the unwanted selection for your EXISTING “a” tags only. But if any new “a” tag is added dynamically to the dom, you have to do the same thing again. But if you use

$("a").live("click", function(){$(this).blur();});

  this will remove your headache about new “a” tags which will be added later.
So live event will reduce the load of calling same function(for applying same event) again and again for new elements. To unbind live event you have to use “die”.

One very important point to note – live event only works for direct selectores. For example, this would work:

$("li a").live(...)

but this would not:

$("a", someElement).live(...)

and neither would this:

$("a").parent().live(...)

I must say jQuery is like a “Lamp of Aladdin” for web developers which has made javascript application development a fun. And the new live event will boost up that fun and make more time for dating

Documentation: http://docs.jquery.com/Events/live

Tags | event, jQuery, live