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106

What is the meaning of callback.call( value, i, value ) in jQuery's each method?

rated 0 times [ 110] [ 4] / answers: 1 / hits: 26000 / 14 Years ago, sun, october 31, 2010, 12:00:00

each() method in jQuery contains such a statement:

callback.call( value, i, value )

I couldn't understand what this statement means exactly.

I know what callback and call mean but I couldn't get the arguments of the function call: (value,i,value). What does this mean?

The statement is used in a for block of each() but my question is independent of that context.

from the jQuery source:

for ( var value = object[0];

      i < length &&

      callback.call( value, i, value ) // <=== LOOK!

      !== false;

      value = object[++i] ) {}

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daquanmilesw

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answered 14 Years ago nadiaa · Accepted Answer

The call method exists on all functions in Javascript. It allows you to call the function and in doing so set the value of this within that function.

function myFunc() {

    console.log(this);

}



myFunc.call(document.body);

In this example, this within myFunc will be document.body.

The first parameter of call is the value to be set as this; subsequent parameters are passed on to the function as normal parameters. So, in your example:

callback.call( value, i, value )

this is equivalent to

callback(i, value)

except that, within the callback, this is now also set to value.