jquery - Adding callback parameter to $.ajax with jsonp -

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i trying implement jquery ajax call cross domain call using jsonp, , code -

$.ajax({     async:true,     cached:true,     url: 'cfcs/temprepository.cfc?method=getallcategories'         +'&storeid='+ storeid         +'&callback=?',     type: 'get',     data: '',     datatype: 'jsonp',     success: populatecategoryobject,     error: function (xhr, status, error) {         console.log(xhr + ',' + status + ',' + error);     } });  function populatecategoryobject(results) {     //populate categories }

i confused here use of callback. if remove success attribute of $.ajax , use callback=populatecategoryobject in place of callback=? -

$.ajax({     async:true,     cached:true,     url: 'cfcs/temprepository.cfc?method=getallcategories'         +'&storeid='+ storeid         +'&callback=populatecategoryobject',     type: 'get',     data: '',     datatype: 'jsonp',     error: function (xhr, status, error) {         console.log(xhr + ',' + status + ',' + error);     } });

the difference makes is, returns result -

populatecategoryobject, jquery172012112959187034678_1376976441013( // data here )

and, function populatecategoryobject not executed.

i unable figure out how set callback function here? , why "jquery172012112959187034678_1376976441013" getting added here result?

thanks in advance.

try

$.ajax({     cached:true,     url: 'cfcs/temprepository.cfc?method=getallcategories' + '&storeid=' + storeid,     jsonpcallback: 'populatecategoryobject',     datatype: 'jsonp',     error: function (xhr, status, error) {         console.log(xhr + ',' + status + ',' + error);     } });

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