disable upload button while uploading. fixes #927

app/pages/welcome/index.js

@@ -78,7 +78,7 @@ module.exports = function(state, emit) {
 
     <button
       class="btn ${btnUploading} ${sendFileClass}"
-      onclick=${upload}
+      onclick=${state.uploading ? noop : upload}
       title="${btnText}">
       ${btnText}
     </button>
@@ -91,6 +91,8 @@ module.exports = function(state, emit) {
   </div>
   `;
 
+  function noop() {}
+
   function dragover(event) {
     const div = document.querySelector('.uploadArea');
     div.classList.add('uploadArea--dragging');
@@ -117,20 +119,22 @@ module.exports = function(state, emit) {
     }
   }
 
-  async function addFiles(event) {
+  function addFiles(event) {
     event.preventDefault();
     const newFiles = Array.from(event.target.files);
 
     emit('addFiles', { files: newFiles });
   }
 
-  async function upload(event) {
+  function upload(event) {
     event.preventDefault();
-
+    event.target.disabled = true;
+    if (!state.uploading) {
       emit('upload', {
         type: 'click',
         dlimit: state.downloadCount || 1,
         password: state.password
       });
     }
+  }
 };