Can't Read property innerHTML Javascript

Question

I'm getting the following error: cannot read property 'innerHTML' of null.

Here is the HTML part:

<div id="itemcost0">300</div>

Now the Javascript part:

    itemcount = parseInt(document.getElementById("itemcounter").value);
    var loop = 0;
    while(loop<=itemcount)
    {
        itemprice = parseInt(document.getElementById("itemcost" + loop).innerHTML);
        loop++;
    }

Before anyone suggests this, the javascript is located after the table the div itemcost0 is in. It should also be noted that itemcount has the correct value.

What is this? document.getElementById("itemcounter").value can you add that part of the html? — Scott
– Scott, Commented Apr 16, 2014 at 13:59
Still might be a good idea to wrap this in a function and call it when the document is ready, no? — bsoist
– bsoist, Commented Apr 16, 2014 at 14:00

epascarello · Accepted Answer · 2014-04-16 14:00:35Z

6

You are using zero index, so the count is probably one less than the max so

while(loop<=itemcount)

should probably be

while(loop<itemcount)

answered Apr 16, 2014 at 14:00

epascarello

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2 Comments

l2aelba Over a year ago

nice, no one found this :P

user3541457 Over a year ago

You were correct. I forgot to subtract 1 from itemcount. Thanks for the help.

ProllyGeek · Accepted Answer · 2014-04-16 13:58:41Z

0

itemcount = parseInt(document.getElementById("itemcounter").value);
    var loop = 0;
    while(loop<=itemcount)
    {
        itemprice = parseInt(document.getElementById("itemcost" + loop.toString()).innerHTML);
        loop++;
    }

loop should be a string not an integer.

answered Apr 16, 2014 at 13:58

ProllyGeek

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1 Comment

epascarello Over a year ago

String + Interger = String AKA "itemcost" + 0 === "itemcost0"

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