CODEWITHSUNDEEP
javascriptjqueryhtmlcss
CW Design
CW Design

Reputation: 125

Dynamically Changing CSS Background Image

What I'm looking for is a way to make my HTML header tag change background images every few seconds. Any solutions are welcome, as long as it is not to complex.

I have this code right now as well as linking to JQuery:

<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>

$(function() {
    var header = $(‘.mainHeader’);
    var backgrounds = new Array(
        ‘url(img/rainbow.jpg)’,
        ‘url(img/chickens_on_grass.jpg)’
        ‘url(img/cattle_on_pasture.jpg)’
        ‘url(img/csa_bundle.jpg)’
    );
    var current = 0;

    function nextBackground() {
        header.css(‘background’,backgrounds[current = ++current % backgrounds.length]);
        setTimeout(nextBackground, 10000);
    }

    setTimeout(nextBackground, 10000);
    header.css(‘background’, backgrounds[0]);
});

My HTML header:

<header class="mainHeader"></header>

And CSS:

.mainHeader {
    background: no-repeat center bottom scroll; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    min-height: 150px;
    padding-top: 2%;
    font-size: 100%;
}

Right now I have now background image at all.

Upvotes: 10

Views: 74967

Answers (5)

Farid Silva Aboid
Farid Silva Aboid

Reputation: 91

It must be late but may help to another one. For this goal in some situations I prefer to use a jquery plugin named tcycle which have only a few lines of code and supports just fade transition, but it works smoothly even with large images.

Setting up a slideshow with tcycle is easy and even could be done with declarative markup such as

<div class="tcycle">
<img src="p1.jpg">
<img src="p2.jpg">
</div>

The trick could be donde using css z-index:-1 for container div and setting width and height to 100%

Homepage for downloading and check for other examples is Malsup jQuery plugins

Upvotes: -1

truleighsyd
truleighsyd

Reputation: 301

You could acheive this same technique with HTML/CSS Only by 1. placing images within an "img" tag in your HTML surrounded by a "div wrapper" and setting it to position:relative and div wrapper img's to position:absolute. For full-width/full-height you can use percentages or potentially "background-size:cover" (haven't checked) and then call a CSS animation to change the images dynamically.

Or 2. you can add multiple images to a background in your CSS separated by commas, apply background-size:cover and again use CSS animations to change the background.

Here's an example and also Mozilla CSS3 Animation Documentation

Upvotes: 5

sopanha
sopanha

Reputation: 345

<html>
<head>
<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script>
$(document).ready(function(){
var header = $('body');

var backgrounds = new Array(
    'url(http://placekitten.com/100)'
  , 'url(http://placekitten.com/200)'
  , 'url(http://placekitten.com/300)'
  , 'url(http://placekitten.com/400)'
);

var current = 0;

function nextBackground() {
    current++;
    current = current % backgrounds.length;
    header.css('background-image', backgrounds[current]);
}
setInterval(nextBackground, 1000);

header.css('background-image', backgrounds[0]);
});
</script>
</head>
<body>
<header></header>
</body>
</html>

Upvotes: 4

gvee
gvee

Reputation: 17171

Made a few amendments to your code

DEMO: http://jsfiddle.net/p77KW/

var header = $('body');

var backgrounds = new Array(
    'url(http://placekitten.com/100)'
  , 'url(http://placekitten.com/200)'
  , 'url(http://placekitten.com/300)'
  , 'url(http://placekitten.com/400)'
);

var current = 0;

function nextBackground() {
    current++;
    current = current % backgrounds.length;
    header.css('background-image', backgrounds[current]);
}
setInterval(nextBackground, 1000);

header.css('background-image', backgrounds[0]);

Biggest changes (as noted in others comments) is that you have to use apostrophe**'**s, not those funky open and close single-quotes and that your array wasn't correct.

With these corrections out of the way I simplified a few things:

  1. Increment current then take modulus (I know this is basically what you did but how much easier is that to debug ;))
  2. Target background-image directly
  3. Used setInterval() instead of a double call to setTimeout

Upvotes: 21

Quentin
Quentin

Reputation: 944321

You can't delimit JavaScript strings with ‘ characters. You must use " or '.

Upvotes: 1

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