如何在我的react组件中渲染draft js的LINK类型的实体映射？-Java 学习之路

我在我的redux商店中有这些数据，我想在反应组件中渲染 .

{
"entityMap":{
      "0":{
           "type":"LINK",
           "mutability":"MUTABLE",
           "data":{"url":"www.google.co.in"}
          }
       },
"blocks":[
      {
        "key":"9k5h7",
         "text":"this is the link", 
         "type":"unstyled",
         "depth":0,
         "inlineStyleRanges":[],
         "entityRanges":[
             {
                "offset":12,
                "length":4,
                "key":0
             }
          ],
         "data":{}
       }
   ]
}

我成功地设法创建了一个带草稿编辑器的链接类型，并且能够将其存储在数据库中，并且在呈现它时，除了链接之外我得到了整个文本 . 我在我的redux中有这个链接信息，即“实体图”以及“块”内的“entityRanges”，它告诉链接开始的偏移量和长度是多少 . 例如，在我的情况下，它是“这是链接”中的“链接” .

这是我用来从我的redux渲染上面的json的代码：

render(){
     return(
            <div>

                {
                    var nn = abovejsonfromreduxstore;
                    var editorState = EditorState.createWithContent(convertFromRaw(JSON.parse(nn)));
               return (        
                      <div>
                          <pre>
                              <Editor 
                                  editorState={editorState}
                                  readOnly 
                               />
                          </pre>
                       </div>
                   </div>
               }

        </div>

        );

}

如何修改此渲染方法以便它也呈现链接实体？

1 回答

你应该这样指定draft.js decorator：

const decorator = new CompositeDecorator([
  {
    strategy: findLinkEntities,
    component: Link,
  },
]);

将 findLinkEntities 函数传递给 strategy 属性，将 Link 反应组件传递给 component 属性：

function findLinkEntities(contentBlock, callback, contentState) {
  contentBlock.findEntityRanges(
    (character) => {
      const entityKey = character.getEntity();
      return (
        entityKey !== null &&
        contentState.getEntity(entityKey).getType() === 'LINK'
      );
    },
    callback
  );
}


const Link = (props) => {
  const {url} = props.contentState.getEntity(props.entityKey).getData();
  return (
    <a href={url}>
      {props.children}
    </a>
  );
};

之后，将这个装饰器传递给 createWithContent 方法：

this.state = {
  editorState: EditorState.createWithContent(convertFromRaw(initialStateRaw), decorator)
};

查看下面隐藏代码段中的工作示例：

const {Editor, CompositeDecorator, convertFromRaw, EditorState} = Draft;

const initialStateRaw = {
"entityMap":{
      "0":{
           "type":"LINK",
           "mutability":"MUTABLE",
           "data":{"url":"www.google.co.in"}
          }
       },
"blocks":[
      {
        "key":"9k5h7",
         "text":"this is the link", 
         "type":"unstyled",
         "depth":0,
         "inlineStyleRanges":[],
         "entityRanges":[
             {
                "offset":12,
                "length":4,
                "key":0
             }
          ],
         "data":{}
       }
   ]
};

function findLinkEntities(contentBlock, callback, contentState) {
  contentBlock.findEntityRanges(
    (character) => {
      const entityKey = character.getEntity();
      return (
        entityKey !== null &&
        contentState.getEntity(entityKey).getType() === 'LINK'
      );
    },
    callback
  );
}

const Link = (props) => {
  const {url} = props.contentState.getEntity(props.entityKey).getData();
  return (
    <a href={url}>
      {props.children}
    </a>
  );
};

class Container extends React.Component {
  constructor(props) {
    super(props);
    
    const decorator = new CompositeDecorator([
      {
        strategy: findLinkEntities,
        component: Link,
      },
    ]);

    this.state = {
      editorState: EditorState.createWithContent(convertFromRaw(initialStateRaw), decorator)
    };
  }
  
  _handleChange = (editorState) => {
    this.setState({ editorState });
  }
  
  render() {
    return (
      <div className="container-root">
        <Editor 
          placeholder="Type away :)"
          editorState={this.state.editorState}
          onChange={this._handleChange}
        />
      </div>
    );
  }
}

ReactDOM.render(<Container />, document.getElementById('react-root'))

body {
  font-family: Helvetica, sans-serif;
}

.container-root {
  border: 1px solid black;
  padding: 5px;
  margin: 5px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.0/react.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.3.0/react-dom.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.1/immutable.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/draft-js/0.7.0/Draft.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/draft-js/0.10.0/Draft.js"></script>
<div id="react-root"></div>

回复于 2024-05-17T01:33:55+08:00

如何在我的react组件中渲染draft js的LINK类型的实体映射？

1 回答

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