problem fixed, that file-upload would not start. Also did some code cleanup

src/converse-chatboxes.js

@@ -131,22 +131,16 @@
 
                 sendFile (file, chatbox) {
                     const self = this;
-                    console.log('Send file via http upload');
                     const request_slot_url = 'upload.' + _converse.domain;
                     _converse.api.disco.supports(Strophe.NS.HTTPUPLOAD, request_slot_url)
                         .then((result) => { 
                             chatbox.showHelpMessages([__('The file upload starts now')],'info');
                             self.requestSlot(file, request_slot_url, function(data) {
                                 if (!data) {
-                                    // general error
-                                    console.log('Unknown error while requesting upload slot.');
                                     alert(__('File upload failed. Please check the log.'));
                                 } else if (data.error) {
-                                    // specific error
-                                    console.log('The XMPP-Server return an error of the type: ' + data.error.type);
                                     alert(__('File upload failed. Please check the log.'));
                                 } else if (data.get && data.put) {
-                                    console.log('slot received, start upload to ' + data.put);
                                     self.uploadFile(data.put, file, function() {
                                         console.log(data.put);
                                         chatbox.onMessageSubmitted(data.put, null, file);
@@ -175,7 +169,7 @@
                     });
                 },
                 
-                uploadFile (url, file, success_cb) {
+                uploadFile (url, file, callback) {
                     console.log("uploadFile start");
                     const xmlhttp = new XMLHttpRequest();
                     const contentType = 'application/octet-stream';
@@ -183,13 +177,11 @@
                         if (xmlhttp.readyState === XMLHttpRequest.DONE) {   
                             console.log("Status: " + xmlhttp.status);
                             if (xmlhttp.status === 200 || xmlhttp.status === 201) {
-                                console.log('file successful uploaded');
-                                if (success_cb) {
-                                    success_cb();
+                                if (callback) {
+                                    callback();
                                 }    
                             }
                             else {
-                                console.log('error while uploading file to ' + url);
                                 alert(__('Could not upload File please try again.'));
                             }
                         }
@@ -198,13 +190,8 @@
                     xmlhttp.open('PUT', url, true);
                     xmlhttp.setRequestHeader("Content-type", contentType);
                     xmlhttp.send(file);
-
-                    console.log("uploadFile end");
                 },
-                
-                /**
-                * Process successful response to slot request.
-                */
+
                 successfulRequestSlotCB (stanza, cb) {
                     const slot = stanza.getElementsByTagName('slot')[0];
                 
@@ -220,9 +207,6 @@
                     }
                 },
                 
-                /**
-                * Process failed response to slot request.
-                */
                 failedRequestSlotCB (stanza, cb) {
                     alert(__('Could not upload File please try again.'));
                 },

src/converse-chatview.js

@@ -116,8 +116,7 @@
                     'call': false,
                     'clear': true,
                     'emoji': true,
-                    'spoiler': true,
-                    'fileUpload': true
+                    'spoiler': true
                 },
             });
             emojione.imagePathPNG = _converse.emojione_image_path;
@@ -379,7 +378,6 @@
                         'label_toggle_spoiler': label_toggle_spoiler,
                         'show_call_button': _converse.visible_toolbar_buttons.call,
                         'show_spoiler_button': _converse.visible_toolbar_buttons.spoiler,
-                        'show_fileUpload_button': _converse.visible_toolbar_buttons.fileUpload,
                         'use_emoji': _converse.visible_toolbar_buttons.emoji,
                     });
                 },
@@ -818,7 +816,7 @@
                     return stanza;
                 },
 
-                sendMessage (message, file=null) {
+                sendMessage (message, file = null) {
                     /* Responsible for sending off a text message.
                      *
                      *  Parameters:
@@ -828,7 +826,7 @@
                     // Especially in the OTR case.
                     var messageStanza;
                     if (file !== null) {
-                        messageStanza = this.createFileMessageStanza(message, this.model.get('jid'));
+                        messageStanza = this.model.createFileMessageStanza(message, this.model.get('jid'));
                     }
                     else {
                         messageStanza = this.createMessageStanza(message);

src/converse-http-file-upload.js

@@ -22,7 +22,6 @@
 
         overrides: {
             ChatBoxView:  {
-
                 events: {
                     'click .toggle-fileUpload': 'toggleFileUpload',
                     'change .fileUpload_input': 'handleFileSelect'
@@ -35,18 +34,6 @@
                         tpl_toolbar_fileupload({'label_upload_file': __('Choose a file to send')}));
                 },
 
-                renderToolbar (toolbar, options) {
-                    const { _converse } = this.__super__;
-                    const result = this.__super__.renderToolbar.apply(this, arguments);
-                    _converse.api.disco.supports(Strophe.NS.HTTPUPLOAD, 'upload.' + _converse.domain)
-                        .then((result) => {
-                            if (result.supported) {
-                                this.addFileUploadButton();
-                            }
-                        });
-                    return result;
-                },
-
                 toggleFileUpload (ev) {
                     this.el.querySelector('.fileUpload_input').click();
                 },
@@ -55,21 +42,24 @@
                     var files = evt.target.files;
                     var file = files[0];
                     this.model.sendFile(file, this);
-                }
+                },
+
+                renderToolbar (toolbar, options) {
+                    const result = this.__super__.renderToolbar.apply(this, arguments);
+                    this.addFileUploadButton();
+                    return result;
+                },
             },
 
             ChatRoomView: {
                 events: {
                     'click .toggle-fileUpload': 'toggleFileUpload',
-                    'change .fileUpload_input': 'handleFileSelect',
+                    'change .fileUpload_input': 'handleFileSelect'
                 }
             }
         },
 
         initialize () {
-            /* The initialize function gets called as soon as the plugin is
-             * loaded by converse.js's plugin machinery.
-             */
             const { _converse } = this,
                 { __ } = _converse;
         }

src/templates/toolbar_fileupload.html

 <input type="file" class="fileUpload_input" style="display:none"/>
 <li class="toggle-fileUpload">
     <a class="fa fa-paperclip" title="{{{o.label_upload_file}}}"></a>
-</li> 
\ No newline at end of file
+</li>