Question

我想从json文件中获取一些值并在多个组件中呈现它们。这段代码似乎不起作用。请提出任何修改建议。可能存在一些范围问题。

var App = React.createClass({

    getInitialState: function(){
      return { myData: [] }

    },
    showResults: function(response){
        this.setState(
          {myData: response}
          )
    },

    loadData: function(URL) {
      $.ajax({
        type: 'GET',
        dataType: 'jsonp',
        url: URL,
        success: function(response){
          this.showResults(response)
        }.bind(this)
      })
    },

    render: function(){
      this.loadData("fileLocation/sample.json");
      return(
        <div>
        {myData.key1}
        <Component1 value={myData.key2} />
        <Component2 value={myData.array[0].key3}/>
        </div>
      )
    }
  });

  var Component1 = React.createClass({
    render: function () {
      return(
        <div>{this.props.value}</div>
      )
    }
  });

  var Component2 = React.createClass({
    render: function () {
      return(
        <div>{this.props.value}</div>
      )
    }
  });
  ReactDOM.render(<App/>, document.getElementById('content'));

这是我试图从中获取的sample.json文件。即使这显示语法错误

{
  key1:"value1",
  key2:"value2",
  array: [
    {key3:"value3"},
    {key4:"value4"}
  ]
}

Answer 1

在showResults [1]正确拨打loadData：

var App = React.createClass({

    getInitialState: function(){
      return { myData: [] };
    },

    showResults: function(response){
        this.setState({
            myData: response
        });
    },

    loadData: function(URL) {
      var that = this;
      $.ajax({
        type: 'GET',
        dataType: 'json',
        url: URL,
        success: function(response){
          that.showResults(response);
        }
      })
    },

将loadData从render移至componentDidMount [2]，并正确访问myData [3]：

    componentDidMount: function() {
      this.loadData("fileLocation/sample.json");
    },

    render: function(){
      return(
        <div>
        {this.state.myData.key1}
        <Component1 value={this.state.myData.key2} />
        <Component2 value={this.state.myData.array[0].key3}/>
        </div>
      )
    }
});

保持Component1和Component2原样：

var Component1 = React.createClass({
    render: function () {
      return(
        <div>{this.props.value}</div>
      )
    }
});

var Component2 = React.createClass({
    render: function () {
      return(
        <div>{this.props.value}</div>
      )
    }
});
ReactDOM.render(<App/>, document.getElementById('content'));

在多个react.js组件

1 个答案: