How can I display a loading image during an AJAX request using jQuery?

Displaying Loading Image During Ajax Execution

To indicate asynchronous request execution, displaying a loading image is often desired. Let's explore how to achieve this using jQuery's $.ajax method.

Introducing an Image

The desired behavior involves displaying an image to indicate the ongoing request. Here's a simple HTML setup:

<img>

AJAX Request Customization

To augment the $.ajax request with the desired visualization, we must include the following:

• Show the Loading Image Before Request: Use the fadeIn() or show() method to make the loading image visible.
• Hide the Loading Image After Completion: Use the fadeOut() or hide() method to remove the loading image after the request finishes.

Customized AJAX Request:

$('#loading-image').fadeIn();
$.ajax({
  url: uri,
  cache: false,
  success: function(html){
    $('.info').append(html);
  },
  complete: function(){
    $('#loading-image').fadeOut();
  }
});

Event-Based Approach

An alternative approach utilizes the global ajaxStart and ajaxStop jQuery events. This allows asynchronous visualization for all AJAX events:

$('#loading-image').bind('ajaxStart', function(){
    $(this).fadeIn();
}).bind('ajaxStop', function(){
    $(this).fadeOut();
});

By implementing these techniques, developers can effectively display a loading image to provide visual feedback during asynchronous requests.

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