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assign javascript var to div style

Posted on 2013-01-31
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Last Modified: 2013-01-31
I have a javascript string variable for background color.
<script>  var  bg_color="black"; </script>
How do I assign this var to div background-color?
<div class="wrapper" style="background-color:??????">
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Question by:yaron89
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8 Comments
 
LVL 30

Expert Comment

by:LZ1
ID: 38839838
Just so you know, it's a very bad practice to have inline styles on your page. Why aren't you setting this on the class or ID of the element instead?
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Author Comment

by:yaron89
ID: 38839848
I have to change it dynamically
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LVL 30

Expert Comment

by:LZ1
ID: 38839873
I would use jQuery, because for me it's easier.
There's 2 ways of doing it. 1 would be to set it inline like you have above. The 2nd and the one I would use would be to add a class that overrides the default styling.

$(document).ready(function(){
     $(".wrapper").click(function(){
	//$(this).css("background", "#000000")
           $(this).addClass("black");
	});
});

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You can replace the click function with whatever you need.
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LVL 46

Expert Comment

by:Chris Stanyon
ID: 38839905
Without jQuery, something like this:

<script type="text/javascript">
var bg_color = '#ff0000';
			
function setBg(element) {
	element.style.backgroundColor = bg_color;
}
</script>

<div class="wrapper" onclick="setBg(this)">This is a test</div>

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Author Comment

by:yaron89
ID: 38839948
It works with onclick event but not with onload. I need to change the background when the page is loading.
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LVL 30

Expert Comment

by:LZ1
ID: 38839958
Then just this:
			$(document).ready(function(){
				$('.wrapper').addClass("black");
				});

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LVL 46

Accepted Solution

by:
Chris Stanyon earned 2000 total points
ID: 38839963
Give the relevant DIV an ID (so you can select it when loading) and then use the following:

<script type="text/javascript">
var bg_color = '#ff0000';
			
function setBg(element) {
	x = document.getElementById(element);
	x.style.backgroundColor = bg_color;
}
<script>

<body onLoad="setBg('myDiv')">
	<div id="myDiv" class="wrapper">This is a test</div>
</body>

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Author Closing Comment

by:yaron89
ID: 38840009
Thank you
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