Question

I am working for some code with bxslider because I have many large images, the page is loading slowly , I tried any lazy loading plugin, but not work well with bxslider. So finally, I tried to write some code by myself.

I tried to do something, if the div is visible, removeAttr data-style, then add addAttr style. my code in jsfiddle (Omitted code for bxslider):

<div class="bgAnchor" data-style="background:url('http://it.bing.com/az/hprichbg?p=rb%2fNewRiverGorgeBridge_ROW468427072.jpg') no-repeat;background-position:0px 0px;"></div>
<div class="bgAnchor" data-style="background:url('http://it.bing.com/az/hprichbg?p=rb%2fPalmFrond_ROW2095872384.jpg') no-repeat;background-position:0px 0px;"></div>
<div class="bgAnchor" data-style="background:url('http://it.bing.com/az/hprichbg?p=rb%2fJacksonSquare_ROW1364682631.jpg') no-repeat;background-position:0px 0px;"></div>
<div class="bgAnchor" data-style="background:url('http://it.bing.com/az/hprichbg?p=rb%2fAustraliaClouds_ROW1600390948.jpg') no-repeat;background-position:0px 0px;"></div>​    

$('.bgAnchor').each(function(){
    if($(this).is(":visible")){
        var data_style = $(this).attr('data-style');
        if(data_style!== 'undefined' && data_style!== false){
            var attr_image = $(this).attr("data-style");
            $(this).css('background',attr_image).removeAttr("data-style");
        }
    }
});​

but I am not sure why it is not work. I am pleasure if any one can help me. many thanks.

Answer 1

from jQuery css() page

Shorthand CSS properties (e.g. margin, background, border) are not supported. 
For example, if you want to retrieve the rendered margin, 
use: $(elem).css('marginTop') 
and $(elem).css('marginRight'), and so on.

this means that you can’t use background in css()

so you have to do it with style attribute.

 $(this).attr('style',attr_image);

here is jsFiddle page