Can I fade in a background image (CSS: background-image) with jQuery?

Question

I have a div element with text in it and a background image, which is set via the CSS property background-image. Is it possible to fade in the back

Answer 1

It's not possible to do it just like that, but you can overlay an opaque div between the div with the background-image and the text and fade that one out, hence giving the appearance that the background is fading in.

Answer 2

You can give opacity value as

div {opacity: 0.4;}

For IE, you can specify as

div { filter:alpha(opacity=10));}

Lower the value - Higher the transparency.

Answer 3

I know i'm late, but I found a way using jquery which works on every browser(i tested it on chrome, firefox and Ie 9)and th fore-ground elements are always displayed instead of css3 transition property.

create 2 absolute wrapper and using z-index.

First set the elements that have to be in the fore-ground with the highest z-index property value, and the other elemets(all included in the body, so: body{}) with a lower z-index property value than the fore-ground elements'one , at least of 2 number lower.

HTML part:

         <div class="wrapper" id="wrapper1"></div>
         <div class="wrapper" id="wrapper2"></div>

css part:

        .fore-groundElements{              //select all fore-ground elements
                  z-index:0;               //>=0
        }
       .wrapper{
                  background-size: cover;
                  width:100%;
                  height:100%;
                  background-size: 100% 100%;
                  position:absolute;
         }

        #wrapper1{
               z-index:-1; 
        }


        #wrapper2{
                 z-index:-2;
         }
         body{

              height:100%;
              width:100%;
              margin:0px;   
              display:cover;
              z-index:-3                          //<=-3
         }

than the javascript/jquery one:

i needed to change the background image every three second so i used a set timeout.

this is the code:

  $(document).ready(main);

  var main = function(){

             var imgPath=[imagesPath1,..,...];                 // the array in which store the image paths

             var newWrapper;                     // the wrapper to display 
             var currentWrapper;                 //the current displayed wrapper which has to be faded
             var l=2;                             // the next image index  to be displayed, it is set to 2 because the first two position of the array(first two images) start already setted up
             var imgNumber= imgPath.length;        //to know when the images are over and restart the carousel
             var currentImg;                       //the next image path to be displayed


             $('#wrapper1').css("background-image", 'url'+imgPath[0]);         //pre set the first wrapper background images
             $('#wrapper2').css("background-image", 'url'+imgPath[1]);          //pre set the first wrapper background images   

             setInterval(myfunction,3000);                //refresh the background image every three seconds

             function myfunction(){
                    if(l===imgNumber-1){               //restart the carousel if every single image has already been displayed                  
                         l=0;
                     };

             if(l%2==0||l%2==2){                    //set the wrapper that will be displaied after the fadeOut callback function
                  currentWrapper='#wrapper1';         
                  newWrapper='#wrapper2';
             }else{
                  currentWrapper='#wrapper2';
                  newWrapper='#wrapper1';
             };
             currentImg=imgPath[l];
            $(currentWrapper).fadeOut(1000,function(){               //fade out the current wrapper, so now the back-ground wrapper is fully displayed
                  $(newWrapper).css("z-index", "-1");                //move the shown wrapper in the fore-ground
                  $(currentWrapper).css("z-index","-2");             //move the hidden wrapper in the back ground
                  $(currentWrapper).css("background-image",'url'+currentImg);                   // sets up the next image that is now shown in the actually hidden background wrapper
                  $(currentWrapper).show();          //shows the background wrapper, which is not visible yet, and it will be shown the next time the setInterval event will be triggered
                  l++;                         //set the next image index that will be set the next time the setInterval event will be triggered 
             });


         };                   //end of myFunction
  }                          //end of main

i hope that my answer is clear,if you need more explanation comment it.

sorry for my english :)