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POelement selection with prototype js
 

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    <p>I'm having a some problems with a page where I have an input to take product EAN code and compare that to a table listing of products and update the input box with id <code>ean_xxxx</code> to <code>oldValue+1</code>. My current code looks like this:</p> <pre><code>function updateProductQty(ean) { var inputs = document.getElementsByTagName("input"); for (var i = 0; i &lt; inputs.length; i++) { if(inputs[i].id == "ean_" + ean) { inputs[i].value = Number(inputs[i].value) + 1; } } } </code></pre> <p>That I call with this code on the input for EAN-code <code>onchange="updateProductQty(this.value);"</code></p> <p>Now the problem is that the input box with ID <code>ean_xxxxx</code> is located inside a table row, and I also need to compare to a value in a previous TD-tag. The value I'm looking for is surrounded by HTML like this:</p> <pre><code>&lt;td&gt; &lt;h5 class="title"&gt;....&lt;/h5&gt; &lt;div&gt;&lt;strong&gt;...&lt;/strong&gt; A252502&lt;/div&gt; &lt;dl class="item-options"&gt; &lt;dt&gt;...&lt;/dt&gt; &lt;dd&gt;..&lt;/dd&gt; &lt;/dl&gt; &lt;/td&gt; .... more &lt;td&gt;-tags &lt;td&gt; ... &lt;input id="ean_xxxx" .... /&gt; ... &lt;/td&gt; </code></pre> <p>As you can see, when I locate the input tag, I never know which row in the table I'm at, and the value I want to add a check for is "A252502".</p> <p>The site uses Prototype as js framework, which I have no experience in what so ever, so I mostly use basic JS where Google fails me for Prototype solutions.</p> <p>If only I could get the TD contents, I could strip the -tag and any spaces to get the value - but how can search for it? I can't even step back in the DOM tree, because I either get the EAN code or this internal article ID, not both. So no <code>inputs[i]</code> to start out from. Any help is highly appreciated, no matter if it's in Prototype syntax or basic JS.</p>
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    1. USChristoffer Bubach
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    1. COYes, you really should use an [id selector](http://prototypejs.org/doc/latest/dom/dollar/index.html) for that input
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      1. USBergi
    2. COWhat I'm looking for is `A252502` from the html `<div><strong>...</strong> A252502</div>` inside that <td> - and there's no way I can change the HTML output, I have to use JS.
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      1. USChristoffer Bubach
    3. CO"A252502" is not even an element, so selecting it is tricky. You could try something like `document.getElementById('ean_'+ean).parentNode.parentNode.firstElementChild.querySelector("div strong").nextSibling` (not sure of the prototype equivalent)
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