Why Does My AJAX Post Fail When Loading a Form with jQuery's $.load()?

Ajax Post Failure Within Loaded Form

In a scenario where a button click triggers the loading of an external form using jQuery's $.load() method, an issue arises when the form attempts to post data. Instead of being forwarded to the intended PHP file, the page reloads itself.

AJAX Overview

Before delving into the solution, it's crucial to understand the concept of AJAX (Asynchronous JavaScript and XML). AJAX allows websites to exchange data with a server without refreshing the entire page.

The Issue and Solution

The issue here stems from a lack of understanding of how AJAX works. The button triggers the loading of an external form using $.load(), but this does not establish an AJAX request. To post data through AJAX, the form must be submitted using the $.ajax() function.

Example Code

Consider the following revised code:

$('#Sel').change(function() {
    var opt = $(this).val();
    var someelse = 'Hello';
    var more_stuff = 'Goodbye';
    $.ajax({
        type: "POST",
        url: "receiving_file.php",
        data: 'selected_opt=' + opt + '&something_else=' +someelse+'&more_stuff='+more_stuff,
        success:function(data){
            alert('This was sent back: ' + data);
        }
    });
});

In this revised code, the form data is posted using $.ajax(). The script will send the selected value and additional parameters to the "receiving_file.php" and display the returned data in an alert box.

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