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POFunction to stop a setInterval call leaving the width style static
 

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    <p>The code below (found here) shows a kind of progress bar that moves very fast towards the right side re-starting non stop. This is done by changing the element's width within a setInterval. </p> <p>How can I build a function that freezes the progress bar motion when called (stops the width from changing freezing it in the moment the function is called)?</p> <p>I'm working with prototype/javascript (the jQuery line in the code is a fast way to add a class in order to publish this post, but I'm not using jQuery). </p> <pre><code> &lt;style&gt; .thepower { opacity: 0; background-color: #191919; padding: 4px; position: absolute; overflow: hidden; width: 300px; height: 24px; top:150px; left:84px; -webkit-border-radius: 16px; border-radius: 16px; -webkit-box-shadow: inset 0 1px 2px #000, 0 1px 0 #2b2b2b; box-shadow: inset 0 1px 2px #000, 0 1px 0 #2b2b2b; } .visible.thepower { opacity: 1; } .thepower .inner { background: #999; display: block; position: absolute; overflow: hidden; max-width: 97.5% !important; height: 24px; text-indent: -9999px; -webkit-border-radius: 12px; border-radius: 12px; -webkit-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3), inset 0 -1px 3px rgba(0, 0, 0, 0.4), 0 1px 1px #000; box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.3), inset 0 -1px 3px rgba(0, 0, 0, 0.4), 0 1px 1px #000; } .green .inner { background: #7EBD01; background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#7EBD01), to(#568201)); } &lt;/style&gt; &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"&gt;&lt;/script&gt; &lt;script&gt; // How it works: /* var counter = 0 (inside a function, window.onload) - A local variable is defined and initialised at zero. window.setInterval(function(){ ... }, 50) - An interval is defined, activating the function (first argument) every 50 milliseconds (20x a second, adjust to your own wishes) (++counter % 101) - Increments the counter by one, modulo 101: The modulo operator calculates the remainder after division, ie: 0 % 101 = 0, 100 % 101 = 100 and 200 % 101 = 99, 201 % 101 = 100, 202 % 101 = 100 */ window.onload = function(){ var counter = 0; window.setInterval(function(){ $(".green").addClass("visible") ; document.querySelector('.green.thepower.visible .inner').style.width = (++counter % 101) + '%'; }, 10); } &lt;/script&gt; &lt;div id="thepower" ad-outlet="thepower"&gt; &lt;div class="green thepower"&gt;&lt;div class="inner"&gt;&lt;/div&gt;&lt;/div&gt; &lt;/div&gt; </code></pre>
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