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javascript pass variable to url

Posted on 2016-07-30
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Last Modified: 2016-08-04
I am trying to pass a simple variable to url but for some reason it is not working. Am I missing something?

function myFunction() {
    var x = "img_tree.png";
    document.body.style.backgroundColor = "#f3f3f3";
    document.body.style.backgroundImage = 'url(x)';
}

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Question by:Mazdajai
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3 Comments
 
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Expert Comment

by:Zvonko
ID: 41736208
Check this:
function myFunction() {
    var x = "img_tree.png";
    document.body.style.backgroundColor = "#f3f3f3";
    document.body.style.backgroundImage = "url('"+x+"')";
}

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And that script does not PASS anything to URL.
The script does set the background image to a image file denoted by the url parameter:
http://www.w3schools.com/jsref/prop_style_backgroundimage.asp
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Author Comment

by:Mazdajai
ID: 41736241
Thanks. Can you explain this?

 '"+x+"'

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Accepted Solution

by:
Zvonko earned 2000 total points
ID: 41737268
No, that I cannot explain.
But I can explain you this:
"url('"+x+"')";

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In JavaScript that are three Strings concatinated to one string value.
In the resulting string value is the middle part enclosed by single quotes and the middle part is comming from variable with the name: x

Is that explanation suitable for you?
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