reactjs - 如何检查 draft js Editor 中的空格

Question

我如何检查编辑器中是否有空格？当编辑器中有空白时，我不想提交表单。我正在使用这个功能来检测编辑器是否为空，但它不会检测编辑器是否有空格

contentState.hasText()

Answer 1

您可以使用两种方法检查编辑器内容，您可以在当前内容状态下调用这两种方法。第一 - hasText第二个getPlainText

查看下面的演示。这里我们检查三种不同的编辑条件:

• 编辑器是空的(没有空格，没有字母，没有其他字符)，

• 是编辑器只包含空格(没有其他字符)，

• 是编辑器包含一些文本(除空格外的任何字符)

const {Editor, EditorState} = Draft;

class Container extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      editorState: EditorState.createEmpty()
    };
  }
  
  _handleChange = (editorState) => {
    this.setState({ editorState });
  }
  
  _checkEditorContent = () => {
    const content = this.state.editorState.getCurrentContent();
    const isEditorEmpty = !content.hasText();
    const currentPlainText = content.getPlainText()
    const lengthOfEditorContent = currentPlainText.length;
    const lengthOfTrimmedContent = currentPlainText.trim().length;
    const isContainOnlySpaces = !isEditorEmpty && !lengthOfTrimmedContent;

    console.clear();
    console.log('editor empty => ', isEditorEmpty)
    console.log('editor containe only spaces => ', isContainOnlySpaces)
    console.log('editor containe some text (not only spaces) => ', !!(!isEditorEmpty && lengthOfTrimmedContent))
  }
  
  render() {
    return (
      <div className="container-root">
        <Editor 
          placeholder="Type away :)"
          editorState={this.state.editorState}
          onChange={this._handleChange}
        />
        <button onClick={this._checkEditorContent}>
          CHECK
        </button>
      </div>
    );
  }
}

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

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

.public-DraftEditor-content {
  border: 1px solid black;
}

<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>