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    <p>This is how you would bind a click handler to your <code>div</code> and add the class to your header:</p> <pre><code>var yourDiv = document.getElementById('your-div-id'); var header = document.getElementById('header'); yourDiv.onclick = function(){ alert("yourDiv was clicked"); header.className = "newCssClass"; }; </code></pre> <p>The above assumes markup like so:</p> <pre><code>&lt;div id="your-div-id"&gt;Click&lt;/div&gt; &lt;div id="header"&gt;&lt;/div&gt; </code></pre> <p>Here's <a href="http://jsfiddle.net/mp8Lq/" rel="nofollow">an example</a>.</p> <p><em>Update:</em> The reason that the <code>expanded</code> variable isn't working as you'd expect is because you're creating a duplicate local variable called <code>expanded</code> in your <code>btnClick()</code> method. As a result, the global <code>expanded</code> variable you declare outside the function is never updated.</p> <p>This is being caused by how you're using the <code>var</code> keyword:</p> <ol> <li>When used outside a function, <code>var</code> creates a global variable that's accessible anywhere within the current document.</li> <li>When used inside a function <code>var</code> creates a local variable that is accessible only within that function.</li> </ol> <p>Here's your function cleaned up to work as you'd expect:</p> <pre><code>// Define global variable (using var outside function) var expanded = true; function btnClick(){ alert('The variable expanded is '+expanded); // Condition for true if(expanded) { // do something // Condition for false } else { // do something else } // Flips boolean value of the global variable (notice lack of var keyword) expanded = !expanded; } </code></pre> <p>Here's <a href="http://jsfiddle.net/mp8Lq/2/" rel="nofollow">an example</a> showing the correct way to update the <code>expanded</code> variable.</p>
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    1. POAdding style to Header when div is clicked using Javascript
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    1. COI would prefer to go the all Javascript route such as this. I've made quite a bit of progress with the route I was going. Right now I'm having trouble with the variable 'expanded' passing through to the function. Any ideas?
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    2. COYep, your trouble is the `var` keyword. Check my updated answer.
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    3. COI updated the script on my web server to the method shown in your example and jsfiddle. I can't get the onClick event to work. I'm not sure which part I configured incorrectly :(.
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