preview uploaded images

index.html

<form id="form1" runat="server">
    <input type='file' id="imgInp" multiple='true' />
    <div id="preview"></div>
</form>

index.js

function readURL(input) {

    if (input.files && input.files.length) {
        [...input.files].map(file=>{          
          var reader = new FileReader();

          reader.onload = function (e) {
            $('#preview').append($('<img/>').attr('src', e.target.result));
          }

          reader.readAsDataURL(file);
        })
    }
}

$("#imgInp").change(function(){
    readURL(this);
});