fix(reply): Fix editor focus causes jumping to page top

src/components/Popups/ReplyField/ReplyField.tsx

@@ -45,33 +45,16 @@ export default class ReplyField extends React.Component<Props, State> {
         value: '',
     };
 
-    editorRef: React.MutableRefObject<Editor | null> = React.createRef<Editor | null>();
-
     constructor(props: Props) {
         super(props);
 
-        const { value, cursorPosition } = props;
-        const contentState = ContentState.createFromText(value as string);
-        let prevEditorState = withMentionDecorator(EditorState.createWithContent(contentState));
-        let selectionState = prevEditorState.getSelection();
-
-        selectionState = selectionState.merge({
-            anchorOffset: cursorPosition,
-            focusOffset: cursorPosition,
-        }) as SelectionState;
-        prevEditorState = EditorState.forceSelection(prevEditorState, selectionState);
-
         this.state = {
             activeItemIndex: 0,
-            editorState: prevEditorState,
+            editorState: this.restoreEditor(),
             popupReference: null,
         };
     }
 
-    componentDidMount(): void {
-        this.focusEditor();
-    }
-
     componentWillUnmount(): void {
         this.saveCursorPosition();
     }
@@ -140,13 +123,6 @@ export default class ReplyField extends React.Component<Props, State> {
         this.setState({ popupReference: activeMention ? this.getVirtualElement(activeMention) : null });
     };
 
-    focusEditor = (): void => {
-        const { current: editor } = this.editorRef;
-        if (editor) {
-            editor.focus();
-        }
-    };
-
     saveCursorPosition = (): void => {
         const { setCursorPosition } = this.props;
         const { editorState } = this.state;
@@ -230,6 +206,22 @@ export default class ReplyField extends React.Component<Props, State> {
         this.setPopupListActiveItem(activeItemIndex === length - 1 ? 0 : activeItemIndex + 1);
     };
 
+    restoreEditor(): EditorState {
+        const { cursorPosition: prevCursorPosition, value } = this.props;
+        const contentState = ContentState.createFromText(value as string);
+        const prevEditorState = withMentionDecorator(EditorState.createWithContent(contentState));
+        const cursorPosition = value ? prevCursorPosition : 0;
+
+        return EditorState.forceSelection(
+            prevEditorState,
+            prevEditorState.getSelection().merge({
+                anchorOffset: cursorPosition,
+                focusOffset: cursorPosition,
+                hasFocus: true,
+            }) as SelectionState,
+        );
+    }
+
     render(): JSX.Element {
         const { className, isDisabled, itemRowAs, placeholder, ...rest } = this.props;
         const { activeItemIndex, editorState, popupReference } = this.state;
@@ -238,7 +230,6 @@ export default class ReplyField extends React.Component<Props, State> {
             <div className={classnames(className, 'ba-ReplyField')}>
                 <Editor
                     {...rest}
-                    ref={this.editorRef}
                     editorState={editorState}
                     handleReturn={this.handleReturn}
                     onChange={this.handleChange}

src/components/Popups/ReplyField/__tests__/ReplyField-test.tsx

@@ -42,6 +42,24 @@ describe('components/Popups/ReplyField', () => {
     const getWrapper = (props = {}): ShallowWrapper<Props, State, ReplyField> =>
         shallow(<ReplyField {...defaults} {...props} />);
 
+    describe('restoreEditor()', () => {
+        test('should restore value and cursor position', () => {
+            const wrapper = getWrapper({ cursorPosition: 1, value: 'test' });
+
+            const editorState = wrapper.instance().restoreEditor();
+
+            expect(editorState.getCurrentContent().getPlainText()).toEqual('test');
+            expect(editorState.getSelection().getFocusOffset()).toEqual(1);
+        });
+
+        test('should reset cursor position if value is empty', () => {
+            const wrapper = getWrapper({ cursorPosition: 1 });
+            const editorState = wrapper.instance().restoreEditor();
+
+            expect(editorState.getSelection().getFocusOffset()).toEqual(0);
+        });
+    });
+
     describe('render()', () => {
         test('should render the editor with right props', () => {
             const wrapper = getWrapper();
@@ -238,22 +256,6 @@ describe('components/Popups/ReplyField', () => {
         });
     });
 
-    describe('focusEditor()', () => {
-        test('should call editor ref focus', () => {
-            const wrapper = getWrapper();
-            const instance = wrapper.instance();
-
-            const editorRef = ({
-                focus: jest.fn(),
-            } as unknown) as Editor;
-
-            instance.editorRef = { current: editorRef };
-            instance.focusEditor();
-
-            expect(editorRef.focus).toBeCalled();
-        });
-    });
-
     describe('saveCursorPosition()', () => {
         test('should call setCursorPosition with cursor position', () => {
             const wrapper = getWrapper();