Moved duplicate code into functions and added better handling of large paste text dumps

web/react/components/create_comment.jsx

@@ -105,16 +105,9 @@ module.exports = React.createClass({
             this.lastTime = t;
         }
     },
-    handleUserInput: function(messageText) {
-        var newPostError = this.state.postError;
-
-        var len = utils.getLengthOfTextInTextarea(messageText);
-
-        if (!this.state.postError && len >= Constants.MAX_POST_LEN) {
-            newPostError = 'Comment length cannot exceed 4000 characters';
-        } else if (this.state.postError === 'Comment length cannot exceed 4000 characters' && len < Constants.MAX_POST_LEN) {
-            newPostError = '';
-        }
+    handleUserInput: function(message) {
+        var messageText = utils.truncateText(message);
+        var newPostError = utils.checkMessageLengthError(messageText, this.state.postError, 'Comment length cannot exceed ' + Constants.MAX_POST_LEN + ' characters');
 
         var draft = PostStore.getCommentDraft(this.props.rootId);
         draft.message = messageText;