Displays a picture LOCALLY when user uploads

show-image.js

/**************************************************************
 * Displaying Picture when user uploads it (from the localhost)
***************************************************************/ 


let tempProfilePicContainer = document.getElementById("reg--profile--pic");
let reader = new FileReader();

function showImage(that){

    reader.onload = function(event){
        tempProfilePicContainer.setAttribute("style","background-image:url('"+reader.result+"')");
    }

    reader.readAsDataURL(event.target.files[0]);

}