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 // Remove the upload window completely (even if it's hidden)
  14 function deactivate_uploads() {
  15         document.getElementById("ctdl-upload").remove();
  16 }
  17
  18
  19 // Turn the specified div into a place where we can upload.  (Note: permanently changes the drag-and-drop behavior of that div.)
  20 function activate_uploads(parent_div) {
  21                 document.getElementById(parent_div).innerHTML += `
  22                         <div class="ctdl-upload" id="ctdl-upload">
  23                                 <div id="ctdl_attachments_title" class="ctdl-compose-attachments-title">
  24                                         <div><h1><i class="fa fa-paperclip" style="color:grey"></i>` + _("Attachments:") + ` <span id="num_attachments">` + uploads.length + `</span></h1></div>
  25                                         <div><h1><i class="fas fa-window-close" style="color:red" onClick="show_or_hide_upload_window()"></i></h1></div>
  26                                 </div>
  27                                 <br>
  28                                 <ul id="ctdl-upload_list">
  29                                 </ul>
  30                                 <br>
  31                                 <div id="drop-area" class="ctdl-upload-drop-area">
  32                                         <form class="ctdl-upload-form">
  33                                                 <p>${_("Drop files here to upload")}</p>
  34                                                 <input type="file" id="fileElem" multiple accept="*/*" onChange="handle_upload_files(this.files)">
  35                                         </form>
  36                                 </div>
  37                         </div>
  38                 `;
  39
  40                 // activate drag and drop
  41                 let dropArea = document.getElementById(parent_div);
  42                 ;['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
  43                         dropArea.addEventListener(eventName, upload_prevent_defaults, false)
  44                 })
  45                 ;["dragenter", "dragover"].forEach(eventName => {
  46                         dropArea.addEventListener(eventName, upload_highlight, false)
  47                 })
  48                 ;['dragleave', 'drop'].forEach(eventName => {
  49                         dropArea.addEventListener(eventName, upload_unhighlight, false)
  50                 })
  51                 dropArea.addEventListener('drop', upload_handle_drop, false);
  52 }
  53
  54
  55 // prevent drag and drop events from propagating up through the DOM
  56 function upload_prevent_defaults(e) {
  57         e.preventDefault();
  58         e.stopPropagation();
  59 }
  60
  61
  62 function upload_handle_drop(e) {
  63         let dt = e.dataTransfer;
  64         let files = dt.files;
  65         handle_upload_files(files);
  66 }
  67
  68
  69 function handle_upload_files(files) {
  70         ([...files]).forEach(upload_file)
  71 }
  72
  73
  74 function upload_file(file) {
  75         var url = '/ctdl/p/';
  76         var xhr = new XMLHttpRequest();
  77         var formData = new FormData();
  78         xhr.open('POST', url, true);
  79
  80         xhr.addEventListener('readystatechange', function(e) {
  81                 if (xhr.readyState == 4 && xhr.status == 200) {
  82                         // remove the "uploading in progress" message
  83                         let li = document.getElementById("ctdl_uploading_" + uploads_in_progress.toString());
  84                         li.parentNode.removeChild(li);
  85                         uploads_in_progress -= 1;
  86
  87                         // The response body will be a JSON array of completed uploads.
  88                         var j_response = JSON.parse(xhr.response);
  89
  90                         // Add these uploads to the displayed list
  91                         j_response.forEach((item) => {
  92                                 let new_upl = document.createElement("li");
  93                                 // item["ref"] is what we need
  94                                 new_upl.innerHTML = `<i class="fa-solid fa-circle-xmark" style="color:red" onClick="alert('` + item["ref"] + `')"></i>`
  95                                 + `&nbsp;`
  96                                 + item["uploadfilename"] + " (" + item["contenttype"] + ", " + item["contentlength"] + " " + _("bytes") + ")";
  97                                 document.getElementById("ctdl-upload_list").appendChild(new_upl);
  98
  99                                 // append it to the global list of uploads
 100                                 uploads.push(item);
 101                         });
 102                         document.getElementById("num_attachments").innerHTML = uploads.length;
 103                 }
 104                 else if (xhr.readyState == 4 && xhr.status != 200) {
 105                         // remove the "uploading in progress" message (there was an error, so just let it disappear)
 106                         let li = document.getElementById("ctdl_uploading_" + uploads_in_progress.toString());
 107                         li.parentNode.removeChild(li);
 108                         uploads_in_progress -= 1;
 109                 }
 110         })
 111
 112         formData.append('file', file);
 113         xhr.send(formData);
 114         uploads_in_progress += 1;
 115
 116         // Make an "uploading in progress" message appear in the uploads list!
 117         progress = document.createElement("li");
 118         progress.setAttribute("id", "ctdl_uploading_" + uploads_in_progress.toString());
 119         progress.innerHTML = `<img src="/ctdl/s/images/dotcrawl.gif" /> ` + _("Processing dropped files...");
 120         document.getElementById("ctdl-upload_list").appendChild(progress);
 121 }
 122
 123
 124 // called when the user drags a file into the upload area
 125 function upload_highlight(e) {
 126         let dropArea = document.getElementById("ctdl-upload");
 127         dropArea.classList.add('highlight')
 128
 129         document.getElementById("ctdl-upload").style.display = "block";         /* also make it appear */
 130 }
 131
 132
 133 // called when the user is no longer dragging a file into the upload area
 134 function upload_unhighlight(e) {
 135         let dropArea = document.getElementById("ctdl-upload");
 136         dropArea.classList.remove('highlight')
 137 }
 138
 139
 140 // Show or hide the attachments window in the composer
 141 function show_or_hide_upload_window() {
 142
 143         if (document.getElementById("ctdl-upload").style.display == "block") {
 144                 document.getElementById("ctdl-upload").style.display = "none";          /* turn it off */
 145         }
 146         else {
 147                 document.getElementById("ctdl-upload").style.display = "block";         /* turn it on */
 148         }
 149 }
 150
 151
 152 // Flush all uploaded files and close the window
 153 function flush_uploads() {
 154         document.getElementById('ctdl-upload').style.display='none';
 155
 156         // FIXME tell the server to delete the files
 157         uploads.forEach(u => {
 158                 console.log(u.ref);
 159         });
 160         uploads=[];
 161
 162         deactivate_uploads();   // this makes the window get destroyed too
 163 }