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copied!<blockquote> <p>however sometimes this function gets called twice at the same time resulting in receiving exactly the same result twice, something I don't want.</p> </blockquote> <p>JavaScript on browsers is single-threaded (barring using the new <a href="http://www.w3.org/TR/workers/" rel="nofollow">web workers</a> stuff, but that wouldn't apply here anyway). Your function will never get called while it's running. (But more below.)</p> <p>In your various code quotes, you're <em>calling</em> <code>myFunc</code> where you mean to just be referring to it. E.g.:</p> <pre><code>var interval = setInterval(myFunc(), 5000); </code></pre> <p>should be</p> <pre><code>var interval = setInterval(myFunc, 5000); // ^--- No parentheses </code></pre> <p>Your code cancelling the timeout will work if you correct that:</p> <pre><code>var interval = setInterval(myFunc, 5000); function buttonClick() { clearTImeout(interval); // do some stuff myFunc(); interval = setInterval(myFunc, 5000); } </code></pre> <p>But there's no reason to do that, <code>myFunc</code> cannot get called while it's running anyway.</p> <p>If <code>myFunc</code> is <em>triggering</em> something that will complete asynchronously (an ajax call, for instance), the above <strong>won't</strong> help (for the simple reason that <code>myFunc</code> will start the process and then return; the process will complete separately). In that situation, your best bet is to have <code>myFunc</code> schedule its next call itself:</p> <pre><code>function myFunc() { // Do my work... // Schedule my next run setTimeout(myFunc, 5000); } </code></pre> <p>...and not use <code>setInterval</code> at all.</p>

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