What is the recommended approach for re-attaching a JavaScript widget after an AJAX call or DOM

I am managing a django website with custom js/widgets that I have created myself. The following is an example of the js code I am using:

$(document).ready(function() {
    $(".input_group_text_clear button").on("click", function (e) {
        data_action = $(this).attr('data-action');
        data_target = $(this).attr('data-target');
        $.each(data_target.split(':'), function(i, target) {
            $("#" + target).val("").trigger("change");
        });
        e.preventDefault();
    });
});

While this code works well when attached to a django widget and included in the template, I encounter issues when posting forms via ajax. After a failed submission, the form along with any error messages/blocks are returned through a json api. I then replace the original form element with the updated one containing errors.

The problem arises when I need to rebind the controls for them to work as intended. My current approach involves extracting the "binding" code into a global function and calling it from the ajax/done handler. However, this method feels inefficient as it requires assuming which controls are present in the form. Are there any best practices for handling element replacement while binding js functions?

Any help or advice on this matter would be greatly appreciated. Sincerely, Paul

Answer №1

To improve your code, consider implementing delegation. Instead of directly binding the click event to the button element itself, it is recommended to bind it to a higher-level parent element that remains unchanged. Utilize the selector argument in the on() method to specify the specific element to bind to.

For instance, if you have the following HTML structure:

<div id="container">
  <form>
     <div id="input_group_text_clear">
        <button>submit</button>
     </div>
  </div>
</div>

In a scenario where your Ajax call replaces the content within the <form> element, your revised code should look like this:

$("#container").on("click", ".input_group_text_clear button", function (e) {
  ...
});

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