Question

我正在使用语义UI React构建输入组件。我希望它在焦点对准时打开下拉列表，而不是默认行为，即当用户更改搜索字符串时显示结果。我正在使用他们的网站here上的道具。

这是我的一些相关代码：

constructor(props) {
  super(props);
  this.handleResultSelect = this.handleResultSelect.bind(this);
  this.handleFocusSearch = this.handleFocusSearch.bind(this);
  this.handleBlurSearch = this.handleBlurSearch.bind(this);
  this.state = ({
    results: [{
      "title": "Roob, Cummerata and Watsica"
    },
    {
      "title": "Stanton, Kessler and Walsh"
    },
    {
      "title": "Boyle, Schuppe and Renner"
    }],
    value: '',
    open: false,
  });
}

handleBlurSearch () {
  this.setState({ 
    open: false,
    focused: false,
  });
}

handleFocusSearch () {
  this.setState({ 
    open: true,
    focused: true,
  });
}

handleResultSelect(e, {result}) {
  this.setState({ value: result.title });
}

render() {
  var searchProps = {
    input: <input className='custom-form-field' placeholder={this.props.placeholder}/>,
    open: this.state.open,
    onFocus: this.handleFocusSearch,
    onBlur: this.handleBlurSearch,
    results: this.state.results,
    onResultSelect: this.handleResultSelect,
    value: this.state.value,
  };

  return ( 
    <SemanticUI.Search {...searchProps} />
  );
}

但是，在选择结果时，未在输入值中设置结果标题值。此外，在调试时，我发现甚至没有调用handleResultSelect。

我的第一个猜测是onBlur导致结果下拉列表关闭，并且结果选择事件被忽略。不过我不确定。我是React和Semantic的新手。

欢迎大家提供帮助。

Answer 1

尝试将值prop添加到searchProps。另外，onBlur事件和onResultSelect彼此冲突，因此我在lodash.debounce函数中添加了一个延迟。

所以，像这样

class SearchExampe extends React.Component {
  constructor(props) {
    super(props);
    this.handleResultSelect = this.handleResultSelect.bind(this);
    this.handleFocusSearch = this.handleFocusSearch.bind(this);
    this.handleBlurSearch = this.handleBlurSearch.bind(this);
    this.handleSearchChange = this.handleSearchChange.bind(this);

    this.state = {
      results: [
        {
          title: "Roob, Cummerata and Watsica"
        },
        {
          title: "Stanton, Kessler and Walsh"
        },
        {
          title: "Boyle, Schuppe and Renner"
        }
      ],
      value: " ",
      open: true
    };
  }

  handleSearchChange(e) {
    this.setState({ value: e.target.value });
  }

  handleBlurSearch() {
    this.setState({
      open: false,
      focused: false
    });
  }

  handleFocusSearch() {
    this.setState({
      open: true,
      focused: true
    });
  }

  handleResultSelect(e) {
    this.setState({ value: e.target.value, open: false });
  }

  render() {
    var searchProps = {
      input: <input className="custom-form-field" onChange={this.handleSearchChange} placeholder="placeholder" />,
      open: this.state.open,
      onFocus: this.handleFocusSearch,
      onBlur: _.debounce(this.handleBlurSearch, 100, {}),
      results: this.state.results,
      onResultSelect: this.handleResultSelect,
      value: this.state.value
    };

    return <Search {...searchProps} />;
  }
}

Answer 2

我非常感谢R. Wright的回答，但是下拉模糊中添加的200ms延迟不符合UX标准。因此，我对javascript的blur进行了更深入的研究，发现它具有一个relatedTarget属性，该属性可用于查看单击了哪个元素。

请注意，这某种程度上仅适用于具有tabindex属性的DOM元素，因此我还必须修改Semantic Search的结果渲染器，以使每个结果都具有属性tabindex=0。另外，可以覆盖tabindex应用于元素的默认焦点CSS。

以此为基础，我编辑了handleBlur，将open: true设置为_.contains(event.relatedTarget.classList, 'title')。

这是我的一些相关代码：

constructor(props) {
  super(props);
  this.handleResultSelect = this.handleResultSelect.bind(this);
  this.handleFocusSearch = this.handleFocusSearch.bind(this);
  this.handleBlurSearch = this.handleBlurSearch.bind(this);
  this.state = ({
    results: [{
      "title": "Roob, Cummerata and Watsica"
    },
    {
      "title": "Stanton, Kessler and Walsh"
    },
    {
      "title": "Boyle, Schuppe and Renner"
    }],
    value: '',
    open: false,
  });
}

handleBlurSearch (event) {
  let open = _.contains(event.relatedTarget.classList, 'title');
  this.setState({ 
    open: open,
    focused: false,
  });
}

handleFocusSearch () {
  this.setState({ 
    open: true,
    focused: true,
  });
}

handleResultSelect(e, {result}) {
  this.setState({ value: result.title, open: false });
}

render() {
  var searchProps = {
    input: <input className='custom-form-field' placeholder={this.props.placeholder}/>,
    open: this.state.open,
    onFocus: this.handleFocusSearch,
    onBlur: this.handleBlurSearch,
    results: this.state.results,
    onResultSelect: this.handleResultSelect,
  };

  return ( 
    <SemanticUI.Search {...searchProps} />
  );
}

Answer 3

另一个选项，查看“下拉列表”组件。下拉列表中的“搜索选择”示例可能会显示您尝试创建的行为。

https://react.semantic-ui.com/modules/dropdown/#types-search-selection

SemanticUI搜索-下拉选择不填充输入

3 个答案: