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    <p>The way you are doing it is fine, but your event listener for the <code>click</code> event should be like this:</p> <pre><code>button.addEventListener("click", function() { alert("alert");}); </code></pre> <p>Notice, the <code>click</code> event should be attached with <code>"click"</code>, not <code>"onclick"</code>.</p> <p>You can also try doing this the old way:</p> <pre><code>function onload() { var button = document.getElementById("buttonid"); // add onclick event button.onclick = function() { alert("alert"); } } </code></pre> <h3>Update 1</h3> <p>You need to also monitor for IE &lt; 9, because those Vs use <code>attachEvent()</code>. Attach the event like this, so it will work with dinosaur browsers:</p> <pre><code>if(button.addEventListener){ button.addEventListener('click', function() { alert("alert");}); } else if(button.attachEvent){ // IE &lt; 9 :( button.attachEvent('onclick', function() { alert("alert");}); } </code></pre> <h3>Update 2</h3> <p>Based on your edit, this <strike>should work</strike> <a href="http://jsfiddle.net/Shef/GcU4Y/" rel="noreferrer">works just fine</a>.</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;script type="text/javascript"&gt; function init() { var button = document.getElementById("buttonid"); if(button.addEventListener){ button.addEventListener("click", function() { alert("alert");}, false); } else if(button.attachEvent){ button.attachEvent("onclick", function() { alert("alert");}); } }; if(window.addEventListener){ window.addEventListener("load", init, false); } else if(window.attachEvent){ window.attachEvent("onload", init); } else{ document.addEventListener("load", init, false); } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;input type="button" id="buttonid" value="click"&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Please, do not use <code>window.onload = on_load();</code>, this will prevent all other <code>onload</code> event listeners from getting fired, or you are risking for your event listener to get overwritten. Consider attaching the <code>onload</code> event the way I am suggesting above.</p>
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    1. POAdding Event Listeners on Elements - Javascript
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    1. COthanks for your reply, i tried changing the way i added the event listener, but it still seem to not work. could it be that i have missed something out?
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    2. COi have tried to replace the whole code with the onload method you provided and also tried replacing the "onclick" to "click" but it still doesn't seem to work. i wasn't able to see any error too, do you happen to know the possible reason why?
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    3. CO@simplified: If by any chance you are checking it in an IE browser version < 9, please check the update. The other reason it might not be working, is because you are not calling the `onload()` function on your `body` tag, like `<body onload="onload()">`.
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