Setting DIV width and height in JavaScript

I have a div with id="div_register". I want to set its width dynamically in JavaScript.

I am using this following code:

getElementById('div_register').style.width=500;

but this line of code isn't working.

I also tried using the units px like the following, still no luck:

getElementById('div_register').style.width='500px';

and

getElementById('div_register').style.width='500';

and

getElementById('div_register').style.width=500px;

but none of this code is working for me.

I don't know what's going wrong.

I am using Mozilla Firefox.

EDIT

<html>
    <head>
        <title>Untitled</title>
        <script>
            function show_update_profile() {
                document.getElementById('black_fade').style.display='block';
                //document.getElementById.('div_register').style.left=((window.innerWidth)-500)/20;
                document.getElementById('div_register').style.height= "500px";
                document.getElementById('div_register').style.width= '500px';
                //alert('kutta');
                  document.getElementById('div_register').style.display='block';
                document.getElementById('register_flag').value= 1;
                document.getElementById('physical_flag').value= 0;
                document.getElementById('cultural_flag').value= 0;
                document.getElementById('professional_flag').value= 0;
                document.getElementById('lifestyle_flag').value= 0;
                document.getElementById('hobby_flag').value= 0;
                //alert(window.innerWidth);
            }
        </script>
        <style>
            .white_content {
                display:none;
            }
        </style>
    </head>
    <body>
        <div id="main">
            <input type="button" onclick="javascript:show_update_profile();" id="show" name="show" value="show"/>
        </div>
        <div id="div_register">
            <table cellpadding="0" cellspacing="0" border="0">
                <tr>
                    <td>
                      welcome 
                    </td>
                </tr>
            </table>
        </div>
    </body>
</html>

The properties you're using may not work in Firefox, Chrome, and other non-IE browsers. To make this work in all browsers, I also suggest adding the following:

document.getElementById('div_register').setAttribute("style","width:500px");

For cross-compatibility, you will still need to use the property. Order may also matter. For instance, in my code, when setting style properties with JavaScript, I set the style attribute first, then I set the properties:

document.getElementById("mydiv").setAttribute("style","display:block;cursor:pointer;cursor:hand;");
document.getElementById("mydiv").style.display = "block";
document.getElementById("mydiv").style.cursor = "hand";

Thus, the most cross-browser compatible example for you would be:

document.getElementById('div_register').setAttribute("style","display:block;width:500px");
document.getElementById('div_register').style.width='500px';

I also want to point out that a much easier method of managing styles is to use a CSS class selector and put your styles in external CSS files. Not only will your code be much more maintainable, but you'll actually make friends with your Web designers!

document.getElementById("div_register").setAttribute("class","wide");

.wide {
    display:block;
    width:500px;
}

.hide {
    display:none;
}

.narrow {
    display:block;
    width:100px;
}

Now, I can easily just add and remove a class attribute, one single property, instead of calling multiple properties. In addition, when your Web designer wants to change the definition of what it means to be wide, he or she does not need to go poking around in your beautifully maintained JavaScript code. Your JavaScript code remains untouched, yet the theme of your application can be easily customized.

This technique follows the rule of separating your content (HTML) from your behavior (JavaScript), and your presentation (CSS).

These are several ways to apply style to an element. Try any one of the examples below:

1. document.getElementById('div_register').className = 'wide';
  /* CSS */ .wide{width:500px;}
2. document.getElementById('div_register').setAttribute('class','wide');
3. document.getElementById('div_register').style.width = '500px';

Setting DIV width and height in JavaScript

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