In jQuery, various methods are available to know that the AJAX request is in progress or completed. With the use of these methods, you can display loading image or text message on the screen.In the tutorial, I am creating examples to show how you can use these methods to display image loader when AJAX is in progress.
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In the loading spinner, you can use font awesome, spinning GIF, image, or custom spinner design as per your theme. Also, you can jQuery ajaxStart() Method and jQuery ajaxStop() Method for the display loader.

The loading spinner, indicator, leading icon whatever you say will be displayed until all the records not fetched. One thing I will do, the user can’t do anything until data is not loaded. I mean mouse will be disabled for that particular browser tab. Then call it using this: DOWNLOAD SPREADSHEET. The button will call our javascript function with the URL we want to download. At this time we make the hidden spinner DIV visible and allow it take over the screen (note position absolute in style). For example, if a user is downloading a file, the progress bar can be used to show the progress of the ongoing download, the same is the case for uploading and etc. Step By Step Guide to Animate Progress Bar
The easiest way to do it is to create two div one over the other. One div with the spinner covering the div with the content, and then when the page finishes loading to display the div with the content over it. On this example I use it on window.load, so you might need to modify the event to be on image load. The rest should work fine. CSS:
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jquery loading spinner overlay example