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    copied!<pre><code>$('#otherField').val(Number($('#numbers').val())+1); </code></pre> <p><strong>Update</strong></p> <p>HTML</p> <pre><code>&lt;p&gt; &lt;select id="numbers" name="numbers" class="numbers"&gt; &lt;option value=""&gt;pick one&lt;/option&gt; &lt;option value="1"&gt;1&lt;/option&gt; &lt;option value="2"&gt;2&lt;/option&gt; &lt;option value="3"&gt;3&lt;/option&gt; &lt;option value="4"&gt;4&lt;/option&gt; &lt;option value="5"&gt;5&lt;/option&gt; &lt;option value="6"&gt;6&lt;/option&gt; &lt;option value="7"&gt;7&lt;/option&gt; &lt;/select&gt; &lt;/p&gt; &lt;p&gt; &lt;select id="morenumbers" name="morenumbers" class="numbers"&gt; &lt;option value=""&gt;pick one&lt;/option&gt; &lt;option value="1"&gt;1&lt;/option&gt; &lt;option value="2"&gt;2&lt;/option&gt; &lt;option value="3"&gt;3&lt;/option&gt; &lt;option value="4"&gt;4&lt;/option&gt; &lt;option value="5"&gt;5&lt;/option&gt; &lt;option value="6"&gt;6&lt;/option&gt; &lt;option value="7"&gt;7&lt;/option&gt; &lt;/select&gt; &lt;/p&gt; </code></pre> <p>jQuery</p> <pre><code>$(".numbers").change(function() { //grab selected value and add it to the 3rd text field //so if 2 is selected, the field with 1 becomes 3 and the total sum becomes 12 var first; var second; var initial = 1; if($('#morenumbers').val() == '') first = 0; else first = Number($('#morenumbers').val()); if($('#numbers').val() == '') second = 0; else second = Number($('#numbers').val()); $('#third').val(first+second+initial); $("input[name^=sum]").sum("keyup", "#totalSum"); }); </code></pre> <p>Fiddle</p> <p><a href="http://jsfiddle.net/rEQnY/9/" rel="nofollow">http://jsfiddle.net/rEQnY/9/</a></p>
 

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