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    <p>Here is the code:</p> <p>I simulated your situation like this:</p> <pre><code>&lt;table id="interest_rate"&gt; &lt;tr&gt; &lt;td&gt; &lt;select class="dropDown" style="width:150px" name="rate_value_1"&gt; &lt;option value="rate_value_1"&gt;rate_value_1&lt;/option&gt; &lt;option value="Floating Rate"&gt;Floating Rate&lt;/option&gt; &lt;option value="Fixed Rate"&gt;Fixed Rate&lt;/option&gt; &lt;/select&gt; &lt;/td&gt; &lt;td&gt;&lt;input type="button" value="equal" class="equal" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;select class="dropDown" style="width:150px" name="rate_value_2"&gt; &lt;option value="rate_value_2"&gt;rate_value_2&lt;/option&gt; &lt;option value="Floating Rate"&gt;Floating Rate&lt;/option&gt; &lt;option value="Fixed Rate"&gt;Fixed Rate&lt;/option&gt; &lt;/select&gt; &lt;/td&gt; &lt;td&gt;&lt;input type="button" value="equal" class="equal" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; </code></pre> <p>And here is the javascript code that are going to work in that situation, you just need to put this code after the table.</p> <pre><code>document.getElementById('interest_rate').onclick = function (e) { if (!e) { e = event; } // Get the clicked target var target = e.target || e.srcElement; // If this is the target that we want to get. if ('equal' == target.className &amp;&amp; 'button' == target.type) { // Get the selected index of the 'SELECT' element. var defaultValue = target.parentNode.parentNode.getElementsByTagName('SELECT')[0].selectedIndex; // Loop and change all 'SELECT' element to the same selected index. for (var i = 0, selects = this.getElementsByTagName('SELECT'), selectsLength = selects.length; i &lt; selectsLength; ++i) { selects[i].selectedIndex = defaultValue; } } }; </code></pre> <p><a href="http://jsfiddle.net/hVuj6/" rel="nofollow">Live jsFiddle Demo</a></p> <hr> <p><strong>EDIT1</strong></p> <p>To change only the <code>SELECT</code> elements below the row, you need to identify the index of the current <code>SELECT</code> element and then change all below. Here is the code:</p> <pre><code>document.getElementById('interest_rate').onclick = function (e) { if (!e) { e = event; } var target = e.target || e.srcElement; if ('equal' == target.className &amp;&amp; 'button' == target.type) { var targetSelect = target.parentNode.parentNode.getElementsByTagName('SELECT')[0]; if (targetSelect) { var defaultValue = targetSelect.selectedIndex; for (var i = 0, selects = this.getElementsByTagName('SELECT'), selectsLength = selects.length, status = 0; i &lt; selectsLength; ++i) { if (status || selects[i] === targetSelect) { status = 1; selects[i].selectedIndex = defaultValue; } } } } }; </code></pre> <p><a href="http://jsfiddle.net/hVuj6/1/" rel="nofollow">Live jsFiddle Demo</a></p> <hr> <p><strong>EDIT2</strong></p> <p>To change the value of <code>INPUT</code> elements with <code>type="text"</code>, you just need to change <code>selectedIndex</code> to <code>value</code> and then check the type of <code>INPUT</code> element like this:</p> <pre><code>document.getElementById('interest_rate').onclick = function (e) { if (!e) { e = event; } var target = e.target || e.srcElement; if ('equal' == target.className &amp;&amp; 'button' == target.type) { var targetInput = target.parentNode.parentNode.getElementsByTagName('INPUT')[0]; if (targetInput &amp;&amp; 'text' == targetInput.type) { var defaultValue = targetInput.value; for (var i = 0, inputs = this.getElementsByTagName('INPUT'), inputsLength = inputs.length, status = 0; i &lt; inputsLength; ++i) { if (status || inputs[i] === targetInput) { status = 1; if ('text' == inputs[i].type) { inputs[i].value = defaultValue; } } } } } }; </code></pre> <p><a href="http://jsfiddle.net/hVuj6/2/" rel="nofollow">Live jsFiddle Demo</a></p>
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    1. POJavascript onclick change the value of the second input box to be the same as the value of the first input box
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    1. POJavascript onclick change the value of the second input box to be the same as the value of the first input box
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    1. COThanks for your quick reply. But the value doesn't change when I select and click on the button.
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    2. CO@Psinyee If you can show me the code of the HTML, I can adapt it for your code.
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    3. CO@Psinyee I just added a demo, you can check it.
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