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    <p>An id has to be unique on a page, you have multiple input's with the same id on the page. Hence why it is only every performing the calculation on the first input. Your best bet is to append a numerical value to 'baseprice' and 'units' input to distinguish each row. In addition pass the 'this' keyword into the calc function to reference the element that has triggered the function.</p> <p>Example row:</p> <pre><code> &lt;tr&gt; &lt;td&gt; &lt;input id="units_1" name="units_1" type="hidden" value="10" /&gt; &lt;!-- attach an onchange handler to baseprice_1, when a change is made trigger the calc function. --&gt; &lt;input id="baseprice_1" name="baseprice_1" type="text" onchange="calc(this);" /&gt; &lt;input id="sub_1" name="sub_1" type="text" /&gt; &lt;/td&gt; &lt;/tr&gt; </code></pre> <p>JS:</p> <pre><code>/* An array to store the subtotals. */ grandTotalArr = []; function calc(el){ /* el = this (which is a reference to baseprice_1) */ baseprice=parseInt(el.value); units=parseInt(document.getElementById("units" + el.id.replace('baseprice', '')).value); x=baseprice*units; document.getElementById("sub" + el.id.replace('baseprice', '')).value=x; /* Store the subtotal in the grandTotalArr using it's id as the key. */ grandTotalArr["sub" + el.id.replace('baseprice', '')] = x; /* Implode all values with the + operator, and evaluate as a JS expression. Once evaluated, update the grand total. */ document.getElementById('grand_total').value = eval(grandTotalArr.join('+')); } </code></pre>
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    1. COHow shall I make each id different? I want to avoid copying the same code and changing one number. eg id1, id2... I have tried id[], this this is only for names.
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    2. COSee above for an indication.
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    3. COI will test now. Please note that my $alter PHP var increments the name (at the moment) and can also increment the id of the input field. This is done by concatenating. Also, $alter is used to alternate the table colour at the same time.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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