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         upload_window = document.getElementById('ctdl-upload');
  16         if (upload_window) {
  17                 upload_window.remove();
  18         }
  19 }
  20
  21
  22 // Turn the specified div into a place where we can upload.  (Note: permanently changes the drag-and-drop behavior of that div.)
  23 function activate_uploads(parent_div) {
  24                 document.getElementById(parent_div).innerHTML += `
  25                         <div class="ctdl-upload" id="ctdl-upload">
  26                                 <div id="ctdl_attachments_title" class="ctdl-compose-attachments-title">
  27                                         <div><h1><i class="fa fa-paperclip" style="color:grey"></i>` + _("Attachments:") + ` <span id="num_attachments">` + uploads.length + `</span></h1></div>
  28                                         <div><h1><i class="fas fa-window-close" style="color:red" onClick="show_or_hide_upload_window()"></i></h1></div>
  29                                 </div>
  30                                 <br>
  31                                 <ul id="ctdl-upload_list">
  32                                 </ul>
  33                                 <br>
  34                                 <div id="drop-area" class="ctdl-upload-drop-area">
  35                                         <form class="ctdl-upload-form">
  36                                                 <p>${_("Drop files here to upload")}</p>
  37                                                 <input type="file" id="fileElem" multiple accept="*/*" onChange="handle_upload_files(this.files)">
  38                                         </form>
  39                                 </div>
  40                         </div>
  41                 `;
  42
  43                 // activate drag and drop
  44                 let dropArea = document.getElementById(parent_div);
  45                 ;['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
  46                         dropArea.addEventListener(eventName, upload_prevent_defaults, false)
  47                 })
  48                 ;["dragenter", "dragover"].forEach(eventName => {
  49                         dropArea.addEventListener(eventName, upload_highlight, false)
  50                 })
  51                 ;['dragleave', 'drop'].forEach(eventName => {
  52                         dropArea.addEventListener(eventName, upload_unhighlight, false)
  53                 })
  54                 dropArea.addEventListener('drop', upload_handle_drop, false);
  55 }
  56
  57
  58 // prevent drag and drop events from propagating up through the DOM
  59 function upload_prevent_defaults(e) {
  60         e.preventDefault();
  61         e.stopPropagation();
  62 }
  63
  64
  65 function upload_handle_drop(e) {
  66         let dt = e.dataTransfer;
  67         let files = dt.files;
  68         handle_upload_files(files);
  69 }
  70
  71
  72 function handle_upload_files(files) {
  73         ([...files]).forEach(upload_file)
  74 }
  75
  76
  77 // Delete an uploaded item from the list
  78 delete_upload = async(ref) => {
  79
  80         response = await fetch(
  81                 "/ctdl/p/" + ref, { method: "DELETE" }
  82         );
  83
  84         if (response.ok) {                              // If the server accepted the delete, remove it from the screen
  85                 var el = document.getElementById(ref);
  86                 el.parentNode.removeChild(el);
  87         }
  88 }
  89
  90
  91 function upload_file(file) {
  92         var url = '/ctdl/p/';
  93         var xhr = new XMLHttpRequest();
  94         var formData = new FormData();
  95         xhr.open('POST', url, true);
  96
  97         xhr.addEventListener('readystatechange', function(e) {
  98                 if (xhr.readyState == 4 && xhr.status == 200) {
  99                         // remove the "uploading in progress" message
 100                         let li = document.getElementById("ctdl_uploading_" + uploads_in_progress.toString());
 101                         li.parentNode.removeChild(li);
 102                         uploads_in_progress -= 1;
 103
 104                         // The response body will be a JSON array of completed uploads.
 105                         var j_response = JSON.parse(xhr.response);
 106
 107                         // Add these uploads to the displayed list
 108                         j_response.forEach((item) => {
 109                                 let new_upl = document.createElement("li");
 110                                 new_upl.setAttribute("id", item["ref"]);        // set the element id to the upload reference
 111                                 new_upl.innerHTML = `<i class="fa-solid fa-circle-xmark" style="color:red" onClick="delete_upload('` + item["ref"] + `')"></i>`
 112                                 + `&nbsp;`
 113                                 + item["uploadfilename"] + " (" + item["contenttype"] + ", " + item["contentlength"] + " " + _("bytes") + ")";
 114                                 document.getElementById("ctdl-upload_list").appendChild(new_upl);
 115
 116                                 // append it to the global list of uploads
 117                                 uploads.push(item);
 118                         });
 119                         document.getElementById("num_attachments").innerHTML = uploads.length;
 120                 }
 121                 else if (xhr.readyState == 4 && xhr.status != 200) {
 122                         // remove the "uploading in progress" message (there was an error, so just let it disappear)
 123                         let li = document.getElementById("ctdl_uploading_" + uploads_in_progress.toString());
 124                         li.parentNode.removeChild(li);
 125                         uploads_in_progress -= 1;
 126                 }
 127         })
 128
 129         formData.append('file', file);
 130         xhr.send(formData);
 131         uploads_in_progress += 1;
 132
 133         // Make an "uploading in progress" message appear in the uploads list!
 134         progress = document.createElement("li");
 135         progress.setAttribute("id", "ctdl_uploading_" + uploads_in_progress.toString());
 136         progress.innerHTML = `<img src="/ctdl/s/images/dotcrawl.gif" /> ` + _("Processing dropped files...");
 137         document.getElementById("ctdl-upload_list").appendChild(progress);
 138 }
 139
 140
 141 // called when the user drags a file into the upload area
 142 function upload_highlight(e) {
 143         let dropArea = document.getElementById("ctdl-upload");
 144         dropArea.classList.add('highlight')
 145
 146         document.getElementById("ctdl-upload").style.display = "block";         /* also make it appear */
 147 }
 148
 149
 150 // called when the user is no longer dragging a file into the upload area
 151 function upload_unhighlight(e) {
 152         let dropArea = document.getElementById("ctdl-upload");
 153         dropArea.classList.remove('highlight')
 154 }
 155
 156
 157 // Show or hide the attachments window in the composer
 158 function show_or_hide_upload_window() {
 159
 160         if (document.getElementById("ctdl-upload").style.display == "block") {
 161                 document.getElementById("ctdl-upload").style.display = "none";          /* turn it off */
 162         }
 163         else {
 164                 document.getElementById("ctdl-upload").style.display = "block";         /* turn it on */
 165         }
 166 }
 167
 168
 169 // Helper function for flush_uploads()
 170 flush_one_upload = async(ref) => {
 171         response = await fetch(
 172                 "/ctdl/p/" + ref, { method: "DELETE" }
 173         );
 174         // We don't have any interest in the server response.
 175 }
 176
 177
 178 // Flush all uploaded files and close the window
 179 function flush_uploads() {
 180         upload_window = document.getElementById('ctdl-upload');
 181
 182         if (upload_window) {
 183                 upload_window.style.display='none';
 184         }
 185
 186         // tell the server to delete the files
 187         uploads.forEach(u => {
 188                 flush_one_upload(u.ref);
 189         });
 190         uploads=[];
 191
 192         deactivate_uploads();   // this makes the window get destroyed too
 193 }