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08.19.2008 at 12:40PM PDT, ID: 23660868
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8.4

What's the big deal about DOM?

Asked by gabrielPennyback in Hypertext Markup Language (HTML), Cascading Style Sheets (CSS)

So what is the big deal? For example, if you go to this page at w3schools.com (http://www.w3schools.com/js/tryit.asp?filename=try_dom_tut_getelementbyid), ...

why would I want to use all that roundabout super technically precise coding, when I could produce the identical result much more simply and intuitively? Would anyone actually write the code for these 4 lines this way?

Furthermore they don't tell you the really interesting stuff, like how the "edit text and click me" button refreshes the images above it.

I suppose I'd be a better coder if I had this foundation, but it seems very daunting. I think I must be very slow and stupid, because I can't seem to learn anything from sites like this. They always tell me that I'll be writing ajax in minutes, and after a half an hour I still don't understand what's going on with this apparently simple piece of code., which I've attached below  For example, I'm used to having to define id's in css ... so where are "main," "main1," and "main2" defined?  Or are they standard terms that every browser knows what to do with? And why would I write <<< document.write("Intro paragraph text: " + x.innerHTML)>>>, when i can just write: "Intro paragraph text: W3Schools example"?

I'm in kind of a bind because I'm trying to learn this stuff as fast as I can for my job. And while in an ideal world  I would have learned all this basic foundational stuff before now, I didn't, and without someone to explain every third word I get stopped dead in my tracks.

Any and all help/comments/advice will be greatly appreciated.

Thanks,

JohnStart Free Trial 
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<html>
<body>
 
<p id="intro">W3Schools example</p>
<div id="main">
<p id="main1">The DOM is very useful</p>
<p id="main2">This example demonstrates how to use the <b>getElementById</b> method</p>
</div>
<script type="text/javascript">
x=document.getElementById("intro");
document.write("Intro paragraph text: " + x.innerHTML);
</script>
 
</body>
</html>
[+][-]08.19.2008 at 12:59PM PDT, ID: 22263298

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Zones: Hypertext Markup Language (HTML), Cascading Style Sheets (CSS)
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Solution Provided By: glcummins
Participating Experts: 4
Solution Grade: A
 
 
[+][-]08.19.2008 at 01:02PM PDT, ID: 22263324

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[+][-]08.19.2008 at 01:21PM PDT, ID: 22263533

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[+][-]08.19.2008 at 07:23PM PDT, ID: 22265636

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[+][-]08.21.2008 at 06:50PM PDT, ID: 22285757

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