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HTML

              
                    <div>
        <label style="font-size: 14px;">
            <span style='color:navy;font-weight:bold'>Attachment Instructions :</span>
        </label>
        <ul>
            <li>
                Allowed only files with extension (jpg, png, gif)
            </li>
            <li>
                Maximum number of allowed files 10 with 300 KB for each
            </li>
            <li>
                you can select files from different folders
            </li>
        </ul>
        <!--To give the control a modern look, I have applied a stylesheet in the parent span.-->
        <span class="btn btn-success fileinput-button">
            <span>Select Attachment </span>
            <input type="file" name="files[]" id="files" multiple accept="image/jpeg, image/png, image/gif," onchange="checkUploadFile()" id = "myFileInput"><br />
        </span>
        <output id="Filelist"></output>
    </div>
              
            
!

CSS

              
                        /*Copied from bootstrap to handle input file multiple*/
        .btn {
            display: inline-block;
            padding: 6px 12px;
            margin-bottom: 0;
            font-size: 14px;
            font-weight: normal;
            line-height: 1.42857143;
            text-align: center;
            white-space: nowrap;
            vertical-align: middle;
            cursor: pointer;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
            background-image: none;
            border: 1px solid transparent;
            border-radius: 4px;
        }
        /*Also */
        .btn-success {
            border: 1px solid #c5dbec;
            background: #D0E5F5;
            font-weight: bold;
            color: #2e6e9e;
        }
        /* This is copied from https://github.com/blueimp/jQuery-File-Upload/blob/master/css/jquery.fileupload.css */
        .fileinput-button {
            position: relative;
            overflow: hidden;
        }
 
            .fileinput-button input {
                position: absolute;
                top: 0;
                right: 0;
                margin: 0;
                opacity: 0;
                -ms-filter: 'alpha(opacity=0)';
                font-size: 200px;
                direction: ltr;
                cursor: pointer;
            }
 
        .thumb {
            height: 80px;
            width: 100px;
            border: 1px solid #000;
        }
 
        ul.thumb-Images li {
            width: 120px;
            float: left;
            display: inline-block;
            vertical-align: top;
            height: 120px;
        }
 
        .img-wrap {
            position: relative;
            display: inline-block;
            font-size: 0;
        }
 
            .img-wrap .close {
                position: absolute;
                top: 2px;
                right: 2px;
                z-index: 100;
                background-color: #D0E5F5;
                padding: 5px 2px 2px;
                color: #000;
                font-weight: bolder;
                cursor: pointer;
                opacity: .5;
                font-size: 23px;
                line-height: 10px;
                border-radius: 50%;
            }
 
            .img-wrap:hover .close {
                opacity: 1;
                background-color: #ff0000;
            }
 
        .FileNameCaptionStyle {
            font-size: 12px;
        }
              
            
!

JS

              
                let myFiles = [];
const files = document.querySelector('myFileInput')
        //I added event handler for the file upload control to access the files properties.
        document.addEventListener("DOMContentLoaded", init, false);
 
        //To save an array of attachments
        var AttachmentArray = [];
 
        //counter for attachment array
        var arrCounter = 0;
 
        //to make sure the error message for number of files will be shown only one time.
        var filesCounterAlertStatus = false;
 
        //un ordered list to keep attachments thumbnails
        var ul = document.createElement('ul');
        ul.className = ("thumb-Images");
        ul.id = "imgList";
 
        function init() {
            //add javascript handlers for the file upload event
            document.querySelector('#files').addEventListener('change', handleFileSelect, false);
        }
 
        //the handler for file upload event
        function handleFileSelect(e) {
            //to make sure the user select file/files
            if (!e.target.files) return;
 
            //To obtaine a File reference
            var files = e.target.files;
 
            // Loop through the FileList and then to render image files as thumbnails.
            for (var i = 0, f; f = files[i]; i++) {
 
                //instantiate a FileReader object to read its contents into memory
                var fileReader = new FileReader();
 
                // Closure to capture the file information and apply validation.
                fileReader.onload = (function (readerEvt) {
                    return function (e) {
                       
                        //Apply the validation rules for attachments upload
                        ApplyFileValidationRules(readerEvt)
 
                        //Render attachments thumbnails.
                        RenderThumbnail(e, readerEvt);
 
                        //Fill the array of attachment
                        FillAttachmentArray(e, readerEvt)
                    };
                })(f);
 
                // Read in the image file as a data URL.
                // readAsDataURL: The result property will contain the file/blob's data encoded as a data URL.
                // More info about Data URI scheme https://en.wikipedia.org/wiki/Data_URI_scheme
                fileReader.readAsDataURL(f);
            }
            document.getElementById('files').addEventListener('change', handleFileSelect, false);
        }
 
        //To remove attachment once user click on x button
        jQuery(function ($) {
            $('div').on('click', '.img-wrap .close', function () {
                var id = $(this).closest('.img-wrap').find('img').data('id');
 
                //to remove the deleted item from array
                var elementPos = AttachmentArray.map(function (x) { return x.FileName; }).indexOf(id);
                if (elementPos !== -1) {
                    AttachmentArray.splice(elementPos, 1);
                }
 
                //to remove image tag
                $(this).parent().find('img').not().remove();
 
                //to remove div tag that contain the image
                $(this).parent().find('div').not().remove();
 
                //to remove div tag that contain caption name
                $(this).parent().parent().find('div').not().remove();
 
                //to remove li tag
                var lis = document.querySelectorAll('#imgList li');
                for (var i = 0; li = lis[i]; i++) {
                    if (li.innerHTML == "") {
                        li.parentNode.removeChild(li);
                    }
                }
 
            });
        }
        )
 
        //Apply the validation rules for attachments upload
        function ApplyFileValidationRules(readerEvt)
        {
            //To check file type according to upload conditions
            if (CheckFileType(readerEvt.type) == false) {
                alert("The file (" + readerEvt.name + ") does not match the upload conditions, You can only upload jpg/png/gif files");
                e.preventDefault();
                return;
            }
 
            //To check file Size according to upload conditions
            if (CheckFileSize(readerEvt.size) == false) {
                alert("The file (" + readerEvt.name + ") does not match the upload conditions, The maximum file size for uploads should not exceed 300 KB");
                e.preventDefault();
                return;
            }
 
            //To check files count according to upload conditions
            if (CheckFilesCount(AttachmentArray) == false) {
                if (!filesCounterAlertStatus) {
                    filesCounterAlertStatus = true;
                    alert("You have added more than 10 files. According to upload conditions you can upload 10 files maximum");
                }
                e.preventDefault();
                return;
            }
        }
 
        //To check file type according to upload conditions
        function CheckFileType(fileType) {
            if (fileType == "image/jpeg") {
                return true;
            }
            else if (fileType == "image/png") {
                return true;
            }
            else if (fileType == "image/gif") {
                return true;
            }
            else {
                return false;
            }
            return true;
        }
 
        //To check file Size according to upload conditions
        function CheckFileSize(fileSize) {
            if (fileSize < 300000) {
               return true;
           }
           else {
               return false;
           }
           return true;
       }
 
       //To check files count according to upload conditions
       function CheckFilesCount(AttachmentArray) {
           //Since AttachmentArray.length return the next available index in the array,
           //I have used the loop to get the real length
           var len = 0;
           for (var i = 0; i < AttachmentArray.length; i++) {
               if (AttachmentArray[i] !== undefined) {
                   len++;
               }
           }
           //To check the length does not exceed 10 files maximum
           if (len > 9) {
                return false;
            }
            else
            {
                return true;
            }
        }
 
        //Render attachments thumbnails.
        function RenderThumbnail(e, readerEvt)
        {
            var li = document.createElement('li');
            ul.appendChild(li);
            li.innerHTML = ['<div class="img-wrap"> <span class="close">&times;</span>' +
                '<img class="thumb" src="', e.target.result, '" title="', escape(readerEvt.name), '" data-id="',
               readerEvt.name, '"/>' + '</div>'].join('');
 
            var div = document.createElement('div');
            div.className = "FileNameCaptionStyle";
            li.appendChild(div);
            div.innerHTML = [readerEvt.name].join('');
            document.getElementById('Filelist').insertBefore(ul, null);
        }
 
        //Fill the array of attachment
        function FillAttachmentArray(e, readerEvt)
        {
            AttachmentArray[arrCounter] =
            {
                AttachmentType: 1,
                ObjectType: 1,
                FileName: readerEvt.name,
                FileDescription: "Attachment",
                NoteText: "",
                MimeType: readerEvt.type,
                Content: e.target.result.split("base64,")[1],
                FileSizeInBytes: readerEvt.size,
            };
            arrCounter = arrCounter + 1;
        }


function checkUploadFile(e){
    //console.log(e)
    //const { files } = e.target;
    //myFiles.concat([...files]);
    // alert("目前圖片長度="+myFiles.length);
  console.log(AttachmentArray)
}
              
            
!
999px

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