File Preview Before Upload jQuery

file-preview.js

function readURL(input){
   if (input.files && input.files[0]) {
      var reader = new FileReader();
      reader.onload = function (e) {
         //e.target.result ->contain image url in encoded form
         //Do action with e.target.result here. Dont place outside onload function. won't work
      };
      reader.readAsDataURL(input.files[0]);
  }
 }