//functions on change event of file input to select different file
    $('body').on('change', '#image_data', function(){
                if (this.files && this.files[0]) {
                     abc += 1; //increementing global variable by 1

                    var z = abc - 1;
                    var x = $(this).parent().find('#previewimg' + z).remove();
                    $(this).before("<div id='abcd"+ abc +"' class='abcd'><img id='previewimg" + abc + "' src=''/></div>");

                    var reader = new FileReader();
                    reader.onload = imageIsLoaded;
                    reader.readAsDataURL(this.files[0]);

                    }));
                }
            });

//To preview image
    function imageIsLoaded(e) {
        $('#previewimg' + abc).attr('src', e.target.result);
    };

success: function(data)
{
$("#previewimg" + abc).remove();
}