I want to do something very simple. I have one button in my page.

<form action="/process" method="POST">
   <input class="btn btn-large btn-primary" type="submit" value='Analyze Topics'>
    </form>

Now what I want is when the user presses this submit button. It shows that "loading" gif animation until it gets the response from server.

But I have been struggling since long time.

How do I implement this?

jquery html css ajax
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