反应:TypeError:无法读取未定义的属性"Item" [英] React : TypeError: Cannot read property 'Item' of undefined

问题描述

我想在新状态道具中访问状态/属性的值.实际上，我已经具有状态属性，在其中存储Item = 5的值，并在UrlParam中创建要存储URL的位置，但是我需要URL属性中的项数字值.我是React的新手，请有人帮我怎么做?

I want to access the value of state/property in new state prop. Actually I have already state property where I am storing value of Item=5 and I create UrlParam Where I am storing URL but I need Item numeric value in URL property. I am new to React , Somebody please help me how to do this ?

当我遇到错误 TypeError:无法读取未定义的属性'Item'时，有人可以帮助我吗?

When I getting Error TypeError: Cannot read property 'Item' of undefined , Could someone please help me ?

代码

 this.state={
  Item : 5,
  skip:0,
  urlParams:`http://localhost:8001/meetups?filter[limit]=${(this.state.Item)}&&filter[skip]=${this.state.skip}`
}

推荐答案

作为另一个答案，您似乎正在尝试在赋值表达式 this之前使用 this.state.Item .state = {...} 已完成.

As another answer mentioned, it looks like you are trying to use this.state.Item before the assignment expression this.state={...} is complete.

也就是说，您似乎希望 urlParams 始终保持最新状态，并使用 Item 和 skip .在这种情况下，您可能希望将其实现为帮助函数，而不是 state 的属性.

That said, it looks a bit like you want urlParams to always stay up-to-date with the new values of Item and skip. If that's the case, you may want to implement it as a helper function instead of a property of state.

class Example extends React.Component {
  constructor(props) {
    super(props);
    
    this.state = {
      Item: 5,
      skip: 0
    }
    
    this.handleClick = this.handleClick.bind(this);
  }

  urlParams() {
    return `http://localhost:8001/parties?filter[limit]=${(this.state.Item)}&&filter[skip]=${this.state.skip}`
  }
  
  handleClick() {
    this.setState({skip: this.state.skip + 1})
  }

  render() {
    return (
      <div>
        <a href={this.urlParams()}>Example link</a>
        <pre>{this.urlParams()}</pre>
        <button onClick={this.handleClick}>Change link</button>
      </div>
    )
  }
}

    
ReactDOM.render(<Example/>, document.querySelector('div#my-example' ))

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
<div id="my-example"></div>

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