CODEWITHSUNDEEP
jqueryimagebackgroundscrolljquery-animate
mtwallet
mtwallet

Reputation: 5086

jQuery on window scroll animate background image position

I am trying to achieve a scrolling effect using jQuery. I have a background div set to 100% browser window size with overflow hidden. This has a large background image that is approx. 1500px x 2000px.

The effect I want is when the user scrolls down the page the background image moves at a percentage of the scrolled distance, so for every 200px scrolled down the page the image moves 10px in the same direction.

Can anyone point me in the right direction? Is this even possible? : ) Many thanks in advance.

UPDATE

I have since tried variations on the suggestion by @Capt Otis but I'm still struggling the code I am playing around with is as follows:

$(window).scroll(function(){
    if($(this).scrollTop() > 200) {
        $('#div').animate({'background-postion': '+=10px 0'}, 500);
    }
});

Can anyone shed any light on what I am doing wrong?

Upvotes: 20

Views: 72201

Answers (6)

brz
brz

Reputation: 1959

If you don't want to be hassled with the extra background div, here's my code I wrapped up from several examples:

$(window).scroll(function () {
    setBackgroundPosition();
})
$(window).resize(function() {
    setBackgroundPosition();
});
function setBackgroundPosition(){
    $("body").css('background-position', "-" + (1920 - $(window).width()) / 2 + "px " + -(Math.max(document.body.scrollTop, document.documentElement.scrollTop) / 4) + "px");
}

The Math.max is required for cross-browser issues. Also replace '1920' with the width of your background image

body{
    background-image:url(images/background.jpg);
    background-position:center top;
    background-repeat:no-repeat;
    background-attachment:fixed;
}

Upvotes: 7

stormwild
stormwild

Reputation: 2955

This worked for me:

In js:

$(window).scroll(function() {
    var x = $(this).scrollTop();
    $('#main').css('background-position', '100% ' + parseInt(-x / 1) + 'px' + ', 0% ' + parseInt(-x / 2) + 'px, center top');
});

In css:

#main {
background: url(../img/img1.png) center top no-repeat, url(../img/img2.png) center top no-repeat, url(../img/img3.png);
background-repeat: no-repeat, no-repeat, repeat-x;
background-position: right top, left top, center top;

Where #main is the div whose background image I wanted to move. No need to have height: 100% for html, body.

This is a variation for multiple background images.

Upvotes: 5

Hussein
Hussein

Reputation: 42818

Here you go. Background is set to 10% scroll. You can change the background scroll rate by changing the 10 in the code.

CSS

html, body{
    height:100%;
    min-height:100%;
    margin:0;
    padding:0;
}
.bg{
    width:100%;
    height:100%;
    background: #fff url(..) no-repeat fixed 0 0;
    overflow:auto;
}

<div class="bg">
   <span>..</span>
</div>

JavaScript

$('.bg').scroll(function() {
    var x = $(this).scrollTop();
    $(this).css('background-position', '0% ' + parseInt(-x / 10) + 'px');
});

Check working example at http://jsfiddle.net/Vbtts/
Click this link for the full screen example: http://jsfiddle.net/Vbtts/embedded/result/

Upvotes: 58

Gareth
Gareth

Reputation: 5719

This might do it:

$(window).scroll(function(){
    $('#div').css("background-position",parseInt($(this).scrollTop()*0.05));
})

Upvotes: 2

Cokegod
Cokegod

Reputation: 8424

I don't think you can use += or -= when you have two parts in the CSS. There is something you can do, it is a bit tricky but it works:

$(window).scroll(function(){
    if($(this).scrollTop() > 200) {
        var bgpos = $("#div").css("background-position");
        var bgposInt = 0;
        if(bgpos.indexOf("px")!=-1) {
            bgpos = bgpos.substr(bgpos.indexOf("px")+3);
            bgposInt = parseInt(bgpos.substr(0, bgpos.indexOf("px")));
        }
        bgposInt += 10;
        $("#div").animate({"background-position": "0 "+bgposInt+"px"}, 500);
    }
});

This code gets only the second number from the background-position of the div (the top position), converts it to int, and increases it by 10. Then it just animates the div to the new position.

Upvotes: 0

Capt Otis
Capt Otis

Reputation: 1260

Look here to see an example of how far the user has scrolled on the page. See the $(this).scrollTop()?

Rather than referencing $(this), try using the background div. Then use a .scroll function to determine how much to move the background.

Your code should look something sort of like this:

$("html").scroll(function{
  var move["bottom"] = $("bg_div").scrollTop();
  $("bg_div").animate({bottom: move}, 500);
});

Upvotes: 0

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