webcit-ng/static/js/upload.js

   1 // Handle any tasks which require uploading files to the server (such as attachments)
   2 // h/t https://www.smashingmagazine.com/2018/01/drag-drop-file-uploader-vanilla-js/ which inspired the design of this module
   3 //
   4 // Copyright (c) 2016-2023 by the citadel.org team
   5 //
   6 // This program is open source software.  Use, duplication, or
   7 // disclosure are subject to the GNU General Public License v3.
   8
   9 var uploads_in_progress = 0;
  10 var uploads = [] ;                                                              // everything the user has uploaded
  11
  12
  13 // Turn the specified div into a place where we can upload.  (Note: permanently changes the drag-and-drop behavior of that div.)
  14 function activate_uploads(parent_div) {
  15                 document.getElementById(parent_div).innerHTML += `
  16                         <div class="ctdl-upload" id="ctdl-upload">
  17                                 <div id="ctdl_attachments_title" class="ctdl-compose-attachments-title">
  18                                         <div><h1><i class="fa fa-paperclip" style="color:grey"></i>` + _("Attachments:") + ` <span id="num_attachments">` + uploads.length + `</span></h1></div>
  19                                         <div><h1><i class="fas fa-window-close" style="color:red" onClick="show_or_hide_upload_window()"></i></h1></div>
  20                                 </div>
  21                                 <br>
  22                                 <ul id="ctdl-upload_list">
  23                                 </ul>
  24                                 <br>
  25                                 <div id="drop-area" class="ctdl-upload-drop-area">
  26                                         <form class="ctdl-upload-form">
  27                                                 <p>${_("Drop files here to upload")}</p>
  28                                                 <input type="file" id="fileElem" multiple accept="*/*" onChange="handle_upload_files(this.files)">
  29                                         </form>
  30                                 </div>
  31                         </div>
  32                 `;
  33
  34                 // activate drag and drop
  35                 let dropArea = document.getElementById(parent_div);
  36                 ;['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
  37                         dropArea.addEventListener(eventName, upload_prevent_defaults, false)
  38                 })
  39                 ;["dragenter", "dragover"].forEach(eventName => {
  40                         dropArea.addEventListener(eventName, upload_highlight, false)
  41                 })
  42                 ;['dragleave', 'drop'].forEach(eventName => {
  43                         dropArea.addEventListener(eventName, upload_unhighlight, false)
  44                 })
  45                 dropArea.addEventListener('drop', upload_handle_drop, false);
  46 }
  47
  48
  49 // prevent drag and drop events from propagating up through the DOM
  50 function upload_prevent_defaults(e) {
  51         e.preventDefault();
  52         e.stopPropagation();
  53 }
  54
  55
  56 function upload_handle_drop(e) {
  57         let dt = e.dataTransfer;
  58         let files = dt.files;
  59         handle_upload_files(files);
  60 }
  61
  62
  63 function handle_upload_files(files) {
  64         ([...files]).forEach(upload_file)
  65 }
  66
  67
  68 function upload_file(file) {
  69         var url = '/ctdl/p/';
  70         var xhr = new XMLHttpRequest();
  71         var formData = new FormData();
  72         xhr.open('POST', url, true);
  73
  74         xhr.addEventListener('readystatechange', function(e) {
  75                 if (xhr.readyState == 4 && xhr.status == 200) {
  76                         // remove the "uploading in progress" message
  77                         let li = document.getElementById("ctdl_uploading_" + uploads_in_progress.toString());
  78                         li.parentNode.removeChild(li);
  79                         uploads_in_progress -= 1;
  80
  81                         // The response body will be a JSON array of completed uploads.
  82                         var j_response = JSON.parse(xhr.response);
  83
  84                         // Add these uploads to the displayed list
  85                         j_response.forEach((item) => {
  86                                 let new_upl = document.createElement("li");
  87                                 // item["ref"] is what we need
  88                                 new_upl.innerHTML = `<a href="xxx">❌</a>`
  89                                 + item["uploadfilename"] + " (" + item["contenttype"] + ", " + item["contentlength"] + " " + _("bytes") + ")";
  90                                 document.getElementById("ctdl-upload_list").appendChild(new_upl);
  91                         });
  92
  93                         // append it to the global list of uploads
  94                         uploads.push(j_response);
  95                         document.getElementById("num_attachments").innerHTML = uploads.length;
  96                 }
  97                 else if (xhr.readyState == 4 && xhr.status != 200) {
  98                         // remove the "uploading in progress" message (there was an error, so just let it disappear)
  99                         let li = document.getElementById("ctdl_uploading_" + uploads_in_progress.toString());
 100                         li.parentNode.removeChild(li);
 101                         uploads_in_progress -= 1;
 102                 }
 103         })
 104
 105         formData.append('file', file);
 106         xhr.send(formData);
 107         uploads_in_progress += 1;
 108
 109         // Make an "uploading in progress" message appear in the uploads list!
 110         progress = document.createElement("li");
 111         progress.setAttribute("id", "ctdl_uploading_" + uploads_in_progress.toString());
 112         progress.innerHTML = `<img src="/ctdl/s/images/dotcrawl.gif" /> ` + _("Processing dropped files...");
 113         document.getElementById("ctdl-upload_list").appendChild(progress);
 114 }
 115
 116
 117 // called when the user drags a file into the upload area
 118 function upload_highlight(e) {
 119         let dropArea = document.getElementById("ctdl-upload");
 120         dropArea.classList.add('highlight')
 121
 122         document.getElementById("ctdl-upload").style.display = "block";         /* also make it appear */
 123 }
 124
 125
 126 // called when the user is no longer dragging a file into the upload area
 127 function upload_unhighlight(e) {
 128         let dropArea = document.getElementById("ctdl-upload");
 129         dropArea.classList.remove('highlight')
 130 }
 131
 132
 133 // Show or hide the attachments window in the composer
 134 function show_or_hide_upload_window() {
 135
 136         if (document.getElementById("ctdl-upload").style.display == "block") {
 137                 document.getElementById("ctdl-upload").style.display = "none";          /* turn it off */
 138         }
 139         else {
 140                 document.getElementById("ctdl-upload").style.display = "block";         /* turn it on */
 141         }
 142 }
 143
 144
 145 // Flush all uploaded files and close the window
 146 function flush_uploads() {
 147         document.getElementById('ctdl-upload').style.display='none';
 148
 149         // FIXME tell the server to delete the files
 150         uploads.forEach(u => {
 151                 console.log(u.ref);
 152         });
 153         uploads=[];
 154 }