How to upload image file from computer and set as div background image using jQuery?

This may solve your problem

JS FIDDLE

HTML

<input type='file' id='getval' name="background-image" /><br/><br/>
<div id='clock'></div>

CSS

#clock{
   background-image:url('');
   background-size:cover;
   background-position: center;
   height: 250px; width: 250px;
   border: 1px solid #bbb;
}

PURE JAVASCRIPT

document.getElementById('getval').addEventListener('change', readURL, true);
function readURL(){
   var file = document.getElementById("getval").files[0];
   var reader = new FileReader();
   reader.onloadend = function(){
      document.getElementById('clock').style.backgroundImage = "url(" + reader.result + ")";        
   }
   if(file){
      reader.readAsDataURL(file);
    }else{
    }
}

It's small way to do this without using FileReader.

http://jsfiddle.net/PuneetChawla/vqn7r0nj/

HTML

<input type='file' id='getval' name="background-image" onchange="readURL(event)" /><br/><br/>
<div id='clock'></div>

CSS

#clock{
           background-image:url('');
           background-size:cover;
           background-position: center;
           height: 250px; width: 250px;
           border: 1px solid #bbb;
            }

JavaScript

function readURL(event){
         var getImagePath = URL.createObjectURL(event.target.files[0]);
         $('#clock').css('background-image', 'url(' + getImagePath + ')');
        }

Explanation - The URL.createObjectURL() static method creates a DOMString containing an URL representing the object given in parameter.