Passing a callback function to jQuery AJAX success function

I'm trying to pass in a function to run when the AJAX call is successful, however it's not working as it say's that "callback is not a function".


Calling Code:



function getGrades(grading_company) {

    // Set file to get results from..
    var loadUrl = "ajax_files/get_grades.php";

    // Set data string
    var dataString = 'gc_id=' + grading_company;

    // Set the callback function to run on success
    var callback = 'showGradesBox';

    // Run the AJAX request
    runAjax(loadUrl, dataString, callback);


function showGradesBox(response) {

    // Code here...


function runAjax(loadUrl, dataString, callback) {

        type: 'GET',
        url: loadUrl,
        data: dataString,
        dataType: 'html',
        error: ajaxError,
        success: function(response) {


Now if I replace this line below with the function name itself it works:


But I can't get it to work like above where I get the function name from a passed in parameter.



showGradesBox is a string in your code. So you have two options to execute the callback function:

If you want to keep the string you can use


(if callback is defined in global scope you can also use window[callback](response);

Or you can pass the function directly:

var callback = showGradesBox;

(in this case you can keep your existing code for callback execution)


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