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this.callback javascript

Posted on 2011-09-14
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Last Modified: 2012-05-12
Hi

As per my knowledge

 var my_alert = function ShowAlert() {  
            alert("This is the test message");  
        }  
        my_alert();  

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is call back but I am not sure what is this,callback().

Please advice.

Regards
Karan Gupta
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Question by:KaranGupta
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by:Michel Plungjan
ID: 36540864
Please show some context.
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by:gurvinder372
ID: 36540877
check this link for some good discussion
http://stackoverflow.com/questions/483073/getting-a-better-understanding-of-callback-functions-in-javascript

example that you posted is more of a delegation than callback.
Callback is mostly used for asynchronous execution to make sure that there is some method waiting for execution when the original method returns back.

For example, call back methods for ajax calls
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gurvinder372 earned 167 total points
ID: 36540881
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by:h4hardy
h4hardy earned 167 total points
ID: 36540895
Hi karan,

here is the good article to get the better idea about the callback function JavaScript,

http://pietschsoft.com/post/2008/02/JavaScript-Function-Tips-and-Tricks.aspx
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by:Kishan Zunjare
Kishan Zunjare earned 166 total points
ID: 36545017
Callback functions are used in JavaScript (JS) extensively. They are required for AJAX/XHR, event handling, and in popular JS libraries.

http://onemarco.com/2008/11/12/callbacks-and-binding-and-callback-arguments-and-references/
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