jquery load callback function 

Syntax
.load( url [, data ] [, complete ] ) 
 
complete parameter is a callback function that is executed when the request completes. The callback function has 3 parameters.
 
CallbackFunction(response, status, xhr)
 
In the following example, the anonymous function that is passed as the third parameter to the load function is executed when the AJAX request completes.
 
<html>
<head>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            var textBoxes = $('input[type="text"]');
            textBoxes.focus(function () {
                var helpDiv = $(this).attr('id');
                $('#' + helpDiv + 'HelpDiv').load('GetHelpText.aspx', { HelpTextKey: helpDiv },
                      function (response, status, xhr) {
                          var errorMessage = 'status : ' + xhr.status + '<br/>';
                          errorMessage += 'status text : ' + xhr.statusText + '<br/>';
                          errorMessage += 'response : ' + response;
                          $('#divError').html(errorMessage);
                      });
            });
 
            textBoxes.blur(function () {
                var helpDiv = $(this).attr('id') + 'HelpDiv';
                $('#' + helpDiv).html('');
            });
        });
    </script>
</head>
<body style="font-family:Arial">
    <table>
        <tr>
            <td>First Name</td>
            <td><input id="firstName" type="text" /></td>
            <td><div id="firstNameHelpDiv"></div></td>
        </tr>
        <tr>
            <td>Last Name</td>
            <td><input id="lastName" type="text" /></td>
            <td><div id="lastNameHelpDiv"></div></td>
        </tr>
        <tr>
            <td>Email</td>
            <td><input id="email" type="text" /></td>
            <td><div id="emailHelpDiv"></div></td>
        </tr>
        <tr>
            <td>Income</td>
            <td><input id="income" type="text" /></td>
            <td><div id="incomeHelpDiv"></div></td>
        </tr>
    </table>
    <br />
    <div id="divError"></div>
</body>
</html>
 
If you want the code in the callback function to execute only if these is an error, you can do so using status parameter as shown below.
$('#' + helpDiv + 'HelpDiv').load('GetHelpText.aspx', { HelpTextKey: helpDiv },
    function (response, status, xhr) {
        if (status == 'error') {
            var errorMessage = 'status : ' + xhr.status + '<br/>';
            errorMessage += 'status text : ' + xhr.statusText + '<br/>';
            errorMessage += 'response : ' + response;
            $('#divError').html(errorMessage);
        }
    });

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