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PONeed to preform operation in javascript
 

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  1. PONeed to preform operation in javascript
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    <p>I want to subtract 2 values, and do the calculation instantly with javascript. I need to find a way to target second <code>&lt;select&gt;</code> id in JS, since i echo the options, I do it like this:</p> <pre><code>&lt;tr&gt; &lt;!-- first row, with css --&gt; &lt;td style="width:50%;"&gt;From&lt;/td&gt; &lt;td style="width:50%;"&gt; &lt;select name="fromlevel" id="fromlevel" style="width:100%; text-align:center; font-weight:bold;"&gt; &lt;?php $i = 1; while ($i &lt; 91) { echo ' &lt;option value=f' . $i . ' name=f' . $i . '&gt;' . $i . '&lt;/option&gt;'; $i++; } ?&gt; &lt;/select&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;!-- second row, with css --&gt; &lt;td&gt;To&lt;/td&gt; &lt;td&gt; &lt;select name="tolevel" id="tolevel" style="width:100%; text-align:center; font-weight:bold;"&gt; &lt;?php $i = 1; while ($i &lt; 91) { echo ' &lt;option value=t' . $i . ' name=t' . $i . '&gt;' . $i . '&lt;/option&gt;'; $i++; } ?&gt; &lt;/select&gt; &lt;/td&gt; &lt;/tr&gt; </code></pre> <p>I referenced the IDs with f1, f2, f3, f4 etc, and t1, t2, t3, t4 etc. Hhow do i distinguish between them in JS?</p> <p>The JS below works if I just refernce the ID of the first <code>&lt;select&gt;</code> as $i, im very bad with JS, and i dont know how to make that reference f$i </p> <pre><code>var level_current_prices = {}; for(var i = 1; i &lt;= 90; i++ ) { level_current_prices[i] = i; } function getCurrentLevel() { // current level, from var levelSetPrice=0; var theForm = document.forms["priceCalcForm"]; var selectedLevel = theForm.elements["fromlevel"]; levelSetPrice = level_current_prices[selectedLevel.value]; return levelSetPrice; } function calculateTotal() { var LevelPrice = getCurrentLevel(); var divobj = document.getElementById('totalPrice'); divobj.style.display='block'; divobj.innerHTML = "Total Price For the Leveling $"+LevelPrice; } function hideTotal() { var divobj = document.getElementById('totalPrice'); divobj.style.display='none'; } document.forms['priceCalcForm'].fromlevel.onchange = function () { calculateTotal(); } </code></pre>
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    1. USWesley Murch
    1. USJohn Doe
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    1. COI do not completely understand what you want to do, but have you tried `theForm.elements["tolevel"]`? which refrences the second select.
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      1. USShedokan
    2. COnot a solution, but you should really quote your html attributes eg: `<option value="t1" name="t1">Caption</option>`
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      1. USNickSlash
 

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