Added the ability to cancel file uploads on posts

web/react/components/create_post.jsx

@@ -180,12 +180,21 @@ module.exports = React.createClass({
     },
     removePreview: function(filename) {
         var previews = this.state.previews;
-        for (var i = 0; i < previews.length; i++) {
-            if (previews[i] === filename) {
-                previews.splice(i, 1);
-                break;
+        var uploadsInProgress = this.state.uploadsInProgress;
+
+        // this can be either an uploaded file or an in progress upload that we need to remove
+        var index = previews.indexOf(filename);
+        if (index !== -1) {
+            previews.splice(index, 1);
+        } else {
+            index = uploadsInProgress.indexOf(filename);
+
+            if (index !== -1) {
+                uploadsInProgress.splice(index, 1);
+                this.refs.fileUpload.cancelUpload(filename);
             }
         }
+
         var draft = PostStore.getCurrentDraft();
         if (!draft) {
             draft = {}
@@ -193,8 +202,10 @@ module.exports = React.createClass({
             draft['uploadsInProgress'] = [];
         }
         draft['previews'] = previews;
+        draft['uploadsInProgress'] = uploadsInProgress;
         PostStore.storeCurrentDraft(draft);
-        this.setState({previews: previews});
+
+        this.setState({previews: previews, uploadsInProgress: uploadsInProgress});
     },
     componentDidMount: function() {
         ChannelStore.addChangeListener(this._onChange);
@@ -270,6 +281,7 @@ module.exports = React.createClass({
                             id="post_textbox"
                             ref="textbox" />
                         <FileUpload
+                            ref='fileUpload'
                             getFileCount={this.getFileCount}
                             onUploadStart={this.handleUploadStart}
                             onFileUpload={this.handleFileUploadComplete}

web/react/components/file_preview.jsx

@@ -45,8 +45,9 @@ module.exports = React.createClass({
 
         this.props.uploadsInProgress.forEach(function(filename) {
             previews.push(
-                <div className="preview-div">
+                <div className="preview-div" data-filename={filename}>
                     <img className="spinner" src="/static/images/load.gif"/>
+                    <a className="remove-preview" onClick={this.handleRemove}><i className="glyphicon glyphicon-remove"/></a>
                 </div>
             );
         }.bind(this));

web/react/components/file_upload.jsx

@@ -4,8 +4,12 @@
 var client = require('../utils/client.jsx');
 var Constants = require('../utils/constants.jsx');
 var ChannelStore = require('../stores/channel_store.jsx');
+var utils = require('../utils/utils.jsx');
 
 module.exports = React.createClass({
+    getInitialState: function() {
+        return {requests: {}};
+    },
     handleChange: function() {
         var element = $(this.refs.fileInput.getDOMNode());
         var files = element.prop('files');
@@ -40,16 +44,26 @@ module.exports = React.createClass({
             formData.append('channel_id', channel_id);
             formData.append('files', files[i], files[i].name);
 
-            client.uploadFile(formData,
+            var request = client.uploadFile(formData,
                 function(data) {
                     parsedData = $.parseJSON(data);
                     this.props.onFileUpload(parsedData['filenames'], channel_id);
+
+                    var requests = this.state.requests;
+                    for (var i = 0; i < parsedData['filenames'].length; i++) {
+                        delete requests[utils.getFileName(parsedData['filenames'][i])];
+                    }
+                    this.setState({requests: requests});
                 }.bind(this),
                 function(err) {
                     this.props.onUploadError(err);
                 }.bind(this)
             );
 
+            var requests = this.state.requests;
+            requests[files[i].name] = request;
+            this.setState({requests: requests});
+
             this.props.onUploadStart([files[i].name], channel_id);
         }
 
@@ -121,18 +135,39 @@ module.exports = React.createClass({
                             function(data) {
                                 parsedData = $.parseJSON(data);
                                 self.props.onFileUpload(parsedData['filenames'], channel_id);
+
+                                var requests = self.state.requests;
+                                for (var i = 0; i < parsedData['filenames'].length; i++) {
+                                    delete requests[utils.getFileName(parsedData['filenames'][i])];
+                                }
+                                self.setState({requests: requests});
                             },
                             function(err) {
                                 self.props.onUploadError(err);
                             }
                         );
 
+                        var requests = self.state.requests;
+                        requests[files[i].name] = request;
+                        self.setState({requests: requests});
+
                         self.props.onUploadStart([name], channel_id);
                     }
                 }
             }
         });
     },
+    cancelUpload: function(filename) {
+        var requests = this.state.requests;
+        var request = requests[filename];
+
+        if (request) {
+            request.abort();
+
+            delete requests[filename];
+            this.setState({requests: requests});
+        }
+    },
     render: function() {
         return (
             <span ref="input" className="btn btn-file"><span><i className="glyphicon glyphicon-paperclip"></i></span><input ref="fileInput" type="file" onChange={this.handleChange} multiple/></span>

web/react/utils/client.jsx

@@ -762,7 +762,7 @@ module.exports.getProfiles = function(success, error) {
 };
 
 module.exports.uploadFile = function(formData, success, error) {
-    $.ajax({
+    var request = $.ajax({
         url: "/api/v1/files/upload",
         type: 'POST',
         data: formData,
@@ -771,12 +771,16 @@ module.exports.uploadFile = function(formData, success, error) {
         processData: false,
         success: success,
         error: function(xhr, status, err) {
-            e = handleError("uploadFile", xhr, status, err);
-            error(e);
+            if (err !== 'abort') {
+                e = handleError("uploadFile", xhr, status, err);
+                error(e);
+            }
         }
     });
 
     module.exports.track('api', 'api_files_upload');
+
+    return request;
 };
 
 module.exports.getPublicLink = function(data, success, error) {