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...
  85                 var el = document.getElementById(ref);                                          // ...remove it from the screen...
  86                 el.parentNode.removeChild(el);
  87                 uploads = uploads.filter((r) => r.ref != ref);                                  // ...remove it from the array...
  88                 document.getElementById("num_attachments").innerHTML = uploads.length;          // ...and update our count
  89         }
  90 }
  91
  92
  93 function upload_file(file) {
  94         var url = '/ctdl/p/';
  95         var xhr = new XMLHttpRequest();
  96         var formData = new FormData();
  97         xhr.open('POST', url, true);
  98
  99         xhr.addEventListener('readystatechange', function(e) {
 100                 if (xhr.readyState == 4 && xhr.status == 200) {
 101                         // remove the "uploading in progress" message
 102                         let li = document.getElementById("ctdl_uploading_" + uploads_in_progress.toString());
 103                         li.parentNode.removeChild(li);
 104                         uploads_in_progress -= 1;
 105
 106                         // The response body will be a JSON array of completed uploads.
 107                         var j_response = JSON.parse(xhr.response);
 108
 109                         // Add these uploads to the displayed list
 110                         j_response.forEach((item) => {
 111                                 let new_upl = document.createElement("li");
 112                                 new_upl.setAttribute("id", item["ref"]);        // set the element id to the upload reference
 113                                 new_upl.innerHTML = `<i class="fa-solid fa-circle-xmark" style="color:red" onClick="delete_upload('` + item["ref"] + `')"></i>`
 114                                 + `&nbsp;`
 115                                 + item["uploadfilename"] + " (" + item["contenttype"] + ", " + item["contentlength"] + " " + _("bytes") + ")";
 116                                 document.getElementById("ctdl-upload_list").appendChild(new_upl);
 117
 118                                 // append it to the global list of uploads
 119                                 uploads.push(item);
 120                         });
 121                         document.getElementById("num_attachments").innerHTML = uploads.length;
 122                 }
 123                 else if (xhr.readyState == 4 && xhr.status != 200) {
 124                         // remove the "uploading in progress" message (there was an error, so just let it disappear)
 125                         let li = document.getElementById("ctdl_uploading_" + uploads_in_progress.toString());
 126                         li.parentNode.removeChild(li);
 127                         uploads_in_progress -= 1;
 128                 }
 129         })
 130
 131         formData.append('file', file);
 132         xhr.send(formData);
 133         uploads_in_progress += 1;
 134
 135         // Make an "uploading in progress" message appear in the uploads list!
 136         progress = document.createElement("li");
 137         progress.setAttribute("id", "ctdl_uploading_" + uploads_in_progress.toString());
 138         progress.innerHTML = `<img src="/ctdl/s/images/dotcrawl.gif" /> ` + _("Processing dropped files...");
 139         document.getElementById("ctdl-upload_list").appendChild(progress);
 140 }
 141
 142
 143 // called when the user drags a file into the upload area
 144 function upload_highlight(e) {
 145         let dropArea = document.getElementById("ctdl-upload");
 146         dropArea.classList.add('highlight')
 147
 148         document.getElementById("ctdl-upload").style.display = "block";         /* also make it appear */
 149 }
 150
 151
 152 // called when the user is no longer dragging a file into the upload area
 153 function upload_unhighlight(e) {
 154         let dropArea = document.getElementById("ctdl-upload");
 155         dropArea.classList.remove('highlight')
 156 }
 157
 158
 159 // Show or hide the attachments window in the composer
 160 function show_or_hide_upload_window() {
 161
 162         if (document.getElementById("ctdl-upload").style.display == "block") {
 163                 document.getElementById("ctdl-upload").style.display = "none";          /* turn it off */
 164         }
 165         else {
 166                 document.getElementById("ctdl-upload").style.display = "block";         /* turn it on */
 167         }
 168 }
 169
 170
 171 // Helper function for flush_uploads()
 172 flush_one_upload = async(ref) => {
 173         response = await fetch(
 174                 "/ctdl/p/" + ref, { method: "DELETE" }
 175         );
 176         // We don't have any interest in the server response.
 177 }
 178
 179
 180 // Flush all uploaded files and close the window
 181 function flush_uploads() {
 182         upload_window = document.getElementById('ctdl-upload');
 183
 184         if (upload_window) {
 185                 upload_window.style.display='none';
 186         }
 187
 188         // tell the server to delete the files
 189         uploads.forEach(u => {
 190                 flush_one_upload(u.ref);
 191         });
 192         uploads=[];
 193         document.getElementById("num_attachments").innerHTML = uploads.length;
 194
 195         deactivate_uploads();   // this makes the window get destroyed too
 196 }