Question

我需要将焦点应用于Draft.js编辑器并将光标定位在第一行/块的开头。编辑器包含多行/块。

仅应用this.refs.editor.focus()时，光标始终位于编辑器中第二个块/行的开头。

使用this question和this issue作为指南，我尝试了以下代码但没有成功。我怀疑将blockMap传递给createFromBlockArray()是不正确的：

focusTopLine() {

  this.refs.editor.focus();

  const { editorState } = this.state;
  const contentState = editorState.getCurrentContent();
  const selectionState = editorState.getSelection();
  const blockMap = contentState.getBlockMap();

  const newContentState = ContentState.createFromBlockArray(blockMap);
  const newEditorState = EditorState.createWithContent(newContentState);

  this.setState({
    editorState: EditorState.forceSelection(newEditorState, selectionState)
  });
}

Answer 1

您可以（可能，我还没有对此进行过测试）与EditorState.moveFocusToEnd()的实施方式类似：

首先，创建一个新的EditorState，其中选择了第一个块：

function moveSelectionToStart(editorState) {
  const content = editorState.getCurrentContent()
  const firstBlock = content.getFirstBlock()
  const firstKey = firstBlock.getKey()
  const length = firstBlock.getLength()

  return EditorState.acceptSelection(
    editorState,
    new SelectionState({
      anchorKey: firstKey,
      anchorOffset: length,
      focusKey: firstKey,
      focusOffset: length,
      isBackward: false,
    })
  )
}

然后用它来移动焦点：

function moveFocusToStart(editorState) {
  const afterSelectionMove = EditorState.moveSelectionToStart(editorState)
  return EditorState.forceSelection(
    afterSelectionMove,
    afterSelectionMove.getSelection()
  )
}

现在可以像这样使用：

this.setState({ editorState: moveFocusToStart(editorState) })

焦点编辑器，第一个块开始处的位置光标

1 个答案: