Question

我使用React编写此演示。我使用Webpack来构建这个演示。当我开始演示时，错误将显示给我。

错误：

未捕获的TypeError：超级表达式必须为null或函数，而不是未定义的

  var data = {  "challengeSelectInfo" : [ {"mob_0" : "xxxxx1211"},
   {"mob_1" : "xxxxx1211"}, {"mob_2" : "xxxxx1211"} ]}
  $scope.radioGrp = (data['challengeSelectInfo'] || []).map(function(obj){      
       for(var i in obj){ 
          return { 'value': i, 'name': obj[i] }; 
       } 
     });

 <input type="radio" ng-repeat="rb in radioGrp" ng-value="rb.value" ng-modal="radioValue" name="{{rb.name}}">

我不知道如何解决这个问题。

Answer 1

您的代码中唯一的警告是由于您没有扩展正确的类，您需要扩展React.Component。

class App extends React.Component {
        constructor(props){
            super(props);
            this.handleClick = this.handleClick.bind(this);
        }
        handleClick(){
            if(this.myTextInput !=null) {
                this.myTextInput.focus();
            }
        }
        render (){
            return (
                <div>
                    <input type="text" ref={(ref) => this.myTextInput = ref} />
                    <input type="button"
                        value="'Focus the text input"
                           onClick={this.handleClick}
                    />
                </div>
            );
        }
    }
    ReactDOM.render(<App />, document.getElementById('app'));

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.8/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/0.14.8/react-dom.min.js"></script>
<div id="app"></div>

Answer 2

尝试以下：

        import React, {Component} from 'react';
        import ReactDOM from 'react-dom';
        class App extends React.Compoment {
          constructor(props){
            super(props);
            this.myTextInput = this.myTextInput.bind(this);
            this.handleClick = this.handleClick.bind(this);
          }
          handleClick(){
            if(this.myTextInput !=null) {
              this.myTextInput.focus();
            }
          }
          render (){
            return (
              <div>
                <input type="text" ref={(ref) => this.myTextInput = ref} />
                <input type="button"
                  value="'Focus the text input"
                  onClick={this.handleClick}
                />
              </div>
            );
          }
        }
        ReactDOM.render(<App />, document.getElementById('app'));

Reactjs，Super表达式必须为null或函数

2 个答案: