Javascript : Onchange Function Causes Error/ Didn't Work

The Following code will add File upload and preview field. This single img works but not in jsCopy

Other way to do:

upload.addEventListener('change', function () {
    document.getElementById(img.id).src = 
    window.URL.createObjectURL(this.files[0])
})

Solution 2:

Problem Solved

Working Fine.

All image fields can able to preform upload and preview function of 'n' fields.

<b>This single img works but not in js</b><br><imgid="img"alt="your image"width="100"height="100" /><inputtype="file"onchange="document.getElementById('img').src = window.URL.createObjectURL(this.files[0])"><br/>
No of Img <inputtype="text"id="noi"name="noi"value=""onkeyup="addFields()"><br /><script>functionaddFields(){
            // Number of inputs to createvar number = document.getElementById("noi").value;
            // Container <div> where dynamic content will be placedvar container = document.getElementById("container");
            var array = ["CRICTICAL","HIGH","LOW","INFO"];
            // Clear previous contents of the containerwhile (container.hasChildNodes()) {
                container.removeChild(container.lastChild);
            }
            for (i=1;i<=number;i++){
                var img = document.createElement("img");
                img.width="100";
                img.height="100";
                img.id="img "+i;

                var upload = document.createElement("input");
                upload.type="file";
                upload.id="upload "+i;
//Working_______________
                upload.onchange=upload.onchange= function () {

                    var img_id=this.getAttribute('id');
                    var imgId = img_id.charAt(7) ; 
                     document.getElementById("img "+imgId).src = window.URL.createObjectURL(this.files[0])
                      }

//________________________________________
                container.appendChild(img);
                container.appendChild(upload);
                container.appendChild(document.createElement("br"));
            }
        }
</script><divid="container"/>