Friday, February 28, 2014

jquery Understanding Event Delegation

The delegate() method attaches one or more event handlers for specified elements that are children of selected elements, and specifies a function to run when the events occur.
Event handlers attached using the delegate() method will work for both current and FUTURE elements (like a new element created by a script).
As of jQuery version 1.7, the on() method is the preferred method for attaching event handlers for selected elements.

When a <p> element inside a <div> element is clicked, change the background color of all <p> elements:
$("div").delegate("p","click",function(){
  $("p").css("background-color","pink");
});

Try it yourself »

Syntax

$(selector).delegate(childSelector,event,data,function)

Parameter Description
childSelector Required. Specifies one or more child elements to attach the event handler to
event Required. Specifies one or more events to attach to the elements.

Multiple event values are separated by space. Must be a valid event
data Optional. Specifies additional data to pass along to the function
function Required. Specifies the function to run when the event occurs

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