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I have a "container" DIV that scales to fit the window 100% and I would like to load a random image into the DIV. I have a working script that works for the html background, but I can't get it to work on a DIV instead.

Anyn suggestions?

Here is the original script:

<script type="text/javascript">
    var imgCount = 3;
    var dir = 'images/';
    var randomCount = Math.round(Math.random() * (imgCount - 1)) + 1;
    var images = new Array
            images[1] = "bg-01.jpg",
            images[2] = "bg-02.jpg",
            images[3] = "bg-03.jpg",
    document.body.style.backgroundImage = "url(" + dir + images[randomCount] + ")"; </script>

I have a "container" DIV that scales to fit the window 100% and I would like to load a random image into the DIV. I have a working script that works for the html background, but I can't get it to work on a DIV instead.

Anyn suggestions?

Here is the original script:

<script type="text/javascript">
    var imgCount = 3;
    var dir = 'images/';
    var randomCount = Math.round(Math.random() * (imgCount - 1)) + 1;
    var images = new Array
            images[1] = "bg-01.jpg",
            images[2] = "bg-02.jpg",
            images[3] = "bg-03.jpg",
    document.body.style.backgroundImage = "url(" + dir + images[randomCount] + ")"; </script>
  • javascript
  • css
  • html
  • random
Share edited Jan 30, 2013 at 11:06 svz 4,58811 gold badges44 silver badges66 bronze badges asked Jan 30, 2013 at 11:05 Craig Jonathan KristensenCraig Jonathan Kristensen 7373 gold badges13 silver badges22 bronze badges 1
  • And what is a problem with div? Show your code where you are trying to set a background for a div, not for body. – Viktor S. Commented Jan 30, 2013 at 11:09
Add a ment  | 

2 Answers 2

Reset to default 5

There should be no problem with that. Just find that div, for instance with document.getElementById() and apply a background image to it:

<div id="divID"></div>
<script type="text/javascript">
    var imgCount = 3;
        var dir = 'images/';
        var randomCount = Math.round(Math.random() * (imgCount - 1)) + 1;
        var images = new Array
                images[1] = "bg-01.jpg",
                images[2] = "bg-02.jpg",
                images[3] = "bg-03.jpg",
        document.getElementById("divID").style.backgroundImage = "url(" + dir + images[randomCount] + ")"; 
   </script>

But note that above script block must go AFTER a div you need to update. Otherwise, at the moment of script execution div will be not available in DOM and document.getElementById will find nothing.

document.body.style.backgroundImage sets the background to <body>

You can easily force it to do it for your selected div by doing:

document.getElementById('divID').style.backgroundImage = "url(" + dir + images[randomCount] + ")";

本文标签： javascriptRandom imagebackground in divStack Overflow

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