Slate.js在选定区域插入新节点时抛出错误

Question

相关代码块:

<Slate editor={editor} value={value} onChange={value => {
setValue(value);
const { selection } = editor;
// if nothing is currently selected under the cursor
if (selection && Range.isCollapsed(selection)) {
const [start] = Range.edges(selection);
// if the two characters beforce the cursor are {{, select them and replace with a template block
const before = Editor.before(editor, start, {distance: 2})
const beforeRange = before && Editor.range(editor, before, start)
const beforeText = beforeRange && Editor.string(editor, beforeRange)
const beforeMatch = beforeText && beforeText.match(/{{/);
if (beforeMatch) {
Transforms.select(editor, beforeRange as Location);
insertTemplateBlock(editor, {name: "test"})
}
}
}}>
...
</Slate>

export const insertTemplateBlock = (editor: Editor, {name, opts, defaultValue}: TemplateBlockProps) => {
const templateBlock = { type: "template-block", name, opts, defaultValue, children: [{text: ''}] }
Transforms.insertNodes(editor, templateBlock);
Transforms.move(editor);
}

具体来说，它总是在insertTemplateBlock函数的第2行中断，沿着以下行给出错误:

Cannot find a descendant at path [0,2] in node: {"children":[{"type":"paragraph","children":[{"text":"Thing is working {{"}]}],"operations":[{"type":"insert_text","path":[0,0],"offset":18,"text":"{"},{"type":"set_selection","properties":{"anchor":{"path":[0,0],"offset":19}},"newProperties":{"anchor":{"path":[0,0],"offset":17}}},{"type":"remove_text","path":[0,0],"offset":17,"text":"{{"},{"type":"insert_node","path":[0,1],"node":{"type":"template-block","name":"test","children":[{"text":""}]}},{"type":"set_selection","properties":{"anchor":{"path":[0,0],"offset":17},"focus":{"path":[0,0],"offset":17}},"newProperties":{"anchor":{"path":[0,1,0],"offset":0},"focus":{"path":[0,1,0],"offset":0}}},{"type":"insert_node","path":[0,2],"node":{"text":""}},{"type":"set_selection","properties":{"anchor":{"path":[0,1,0],"offset":0},"focus":{"path":[0,1,0],"offset":0}},"newProperties":{"anchor":{"path":[0,2],"offset":0},"focus":{"path":[0,2],"offset":0}}}],"selection":{"anchor":{"path":[0,2],"offset":0},"focus":{"path":[0,2],"offset":0}},"marks":null,"history":{"undos":[[{"type":"set_selection","properties":null,"newProperties":{"anchor":{"path":[0,0],"offset":0},"focus":{"path":[0,0],"offset":0}}}],[{"type":"insert_text","path":[0,0],"offset":0,"text":"T"},{"type":"insert_text","path":[0,0],"offset":1,"text":"h"},{"type":"insert_text","path":[0,0],"offset":2,"text":"i"},{"type":"insert_text","path":[0,0],"offset":3,"text":"n"},{"type":"insert_text","path":[0,0],"offset":4,"text":"g"},{"type":"insert_text","path":[0,0],"offset":5,"text":" "},{"type":"insert_text","path":[0,0],"offset":6,"text":"i"},{"type":"insert_text","path":[0,0],"offset":7,"text":"s"},{"type":"insert_text","path":[0,0],"offset":8,"text":" "},{"type":"insert_text","path":[0,0],"offset":9,"text":"w"},{"type":"insert_text","path":[0,0],"offset":10,"text":"o"},{"type":"insert_text","path":[0,0],"offset":11,"text":"r"},{"type":"insert_text","path":[0,0],"offset":12,"text":"k"},{"type":"insert_text","path":[0,0],"offset":13,"text":"i"},{"type":"insert_text","path":[0,0],"offset":14,"text":"n"},{"type":"insert_text","path":[0,0],"offset":15,"text":"g"},{"type":"insert_text","path":[0,0],"offset":16,"text":" "},{"type":"set_selection","properties":null,"newProperties":{"anchor":{"path":[0,0],"offset":17},"focus":{"path":[0,0],"offset":17}}}],[{"type":"insert_text","path":[0,0],"offset":17,"text":"{"},{"type":"insert_text","path":[0,0],"offset":18,"text":"{"},{"type":"set_selection","properties":{"anchor":{"path":[0,0],"offset":19}},"newProperties":{"anchor":{"path":[0,0],"offset":17}}},{"type":"remove_text","path":[0,0],"offset":17,"text":"{{"},{"type":"insert_node","path":[0,1],"node":{"type":"template-block","name":"test","children":[{"text":""}]}},{"type":"set_selection","properties":{"anchor":{"path":[0,0],"offset":17},"focus":{"path":[0,0],"offset":17}},"newProperties":{"anchor":{"path":[0,1,0],"offset":0},"focus":{"path":[0,1,0],"offset":0}}},{"type":"insert_node","path":[0,2],"node":{"text":""}},{"type":"set_selection","properties":{"anchor":{"path":[0,1,0],"offset":0},"focus":{"path":[0,1,0],"offset":0}},"newProperties":{"anchor":{"path":[0,2],"offset":0},"focus":{"path":[0,2],"offset":0}}}]],"redos":[]}}

在他们提到的例子中没有发生这种情况，它使用了类似的逻辑。任何帮助将不胜感激!

Codesandbox: https://codesandbox.io/s/elastic-turing-dv9bm?file=/src/App.tsx

更新:我已经发现这个问题可以通过移动插入逻辑(目前在if语句中)到一个useEffect钩子来避免，这取决于包含选择的target值，类似于Slate提到的例子是如何工作的。但是，我还是很想知道为什么我用问题语句的方式写Slate时，它会这样中断。

Answer 1

当您使用useMemo时，问题与渲染有关，而您应该使用useRef:

const editorRef = useRef()
if (!editorRef.current) editorRef.current = withReact(createEditor())
const editor = editorRef.current

https://github.com/ianstormtaylor/slate/issues/4081

Answer 2

我认为你的问题源于<Slate>是上下文提供程序的事实，你实际上应该使用一个嵌套的<Editable>组件来处理事件-在你的情况下onKeyDown。在您提到的特定示例中，我相信您遇到了嵌套Editable组件不会发生的竞争条件。请参阅文档中walkthrough下的Installing Slate。

https://docs.slatejs.org/walkthrouli/01-installing-slate