javascript - Get the value of an element whose id changes -


i trying values of multiple inputs on page. ids of inputs generated dynamically. 

<input id="updates_662224305" class="text quantity" type="text" value="1" name="updates[662224305]" size="4">

i running loop table , cells in inputs contained. getting innerhtml of cells inputs located in, , slicing section ids are:

var racetamarray = [], racetamtotal = 0, table = document.getelementbyid('cart-table'), cells = table.getelementsbytagname('td');  (var i=0,len=cells.length; i<len; i++){      if(cells[i].innerhtml.indexof("ncombo-racetam") != -1) {         i+=3;         var racetaminput = cells[i].innerhtml;         var racetaminputcontain = racetaminput.slice(43,60);         var racetamelem = document.getelementbyid(racetaminputid);         racetamarray.push(parseint(racetamelem.value));     } }

this worked in firefox, able extract ids , put them in variable racetamelem. when tried in chrome not work, slice occurs @ different section of string , not capture ids. there better way slice or of converting inputs string dom element?

html of 1 of rows in table:

<tr class="item sampler-pramiracetam-capsules"> <td> <span class="ncombo-racetam"></span> <a href="/products/sampler-pramiracetam-capsules"> <img src="//cdn.shopify.com/s/files/1/0173/1766/products/pramiracetamcaps_grande_thumb.jpg?v=1396441752"  alt="sampler, pramiracetam capsules" /> </a> </td> <td> <a href="/products/sampler-pramiracetam-capsules">sampler, pramiracetam capsules - 30 capsules</a></td> <td>$8.90</td> <td><input class="text quantity" type="text" size="4" id="updates_658967781" name="updates[658967781]" value="1" class="replace"  /></td> <td>$8.90</td> <td><a class="btn remove-from-cart" href="/cart/change?id=658967781&quantity=0">remove</a></td> </tr>

this walks through table rows , checks elements in first cell class name, , if found push input value (from fourth cell) array.

demo: http://jsfiddle.net/seae4/

var racetamarray = []; var table = document.getelementbyid('cart-table'); var row;  for(var i=0; i<table.rows.length; i++){     row = table.rows[i];     if(row.cells.length > 3){         if(row.cells[0].queryselectorall('.ncombo-racetam').length) {             racetamarray.push(row.cells[3].getelementsbytagname('input')[0].value);         }     } }  console.log(racetamarray);

side note: if need support ie7 or older need replace queryselectorall() call more code check each element class.


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