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前言:
项目有个需求是:跳转路由,在离开页面前,需要弹框询问用户是否确定离开。
react-router<Prompt>组件是可以的,但是,怎么使用antd组件(或者说自定义组件)呢?
请看下面

先看的这个:https://stackoverflow.com/questions/32841757/detecting-user-leaving-page-with-react-router
(1)使用react-router<Prompt>

import { Prompt } from 'react-router'

<Prompt
  message="你确定要离开嘛?"
/>

(2)<Prompt>支持函数

<Prompt
  when={true}
  message={(location) => {
    return window.confirm(`confirm to leave to ${location.pathname}?`);
  }}
/>

(3)history.block这个是个坑!

import { history } from 'path/to/history';
class MyComponent extends React.Component {
   componentDidMount() {
      history.block(targetLocation => {
           // take your action here     
           return false;
      });
   }
   render() {
      //component render here
   }
}

坑的原因是history.block()方法是不能和<Modal>组件并列使用的,而必须在history.block()内部去调用<Modal>组件(就是注释take your action here那里),这就导致一个问题:<Modal>组件里的 onOk、onCancel 如何返回值给 history.block()的 return 语句(return false/true)的同时,不让history.block()的 return 语句和 <Modal>组件顺序执行呢?

说白点就是,<Modal>组件先显示出来,阻塞后面的 return false/true,等 <Modal>组件的 onOk、onCancel 方法执行后,再 return false/true

我试了几种方法,不行,直到找到这篇文章:
Using React-Router v4 Prompt with custom modal component

(4)在离开页面,路由跳转时,自定义弹框拦截,并询问

  handlePrompt = location => {
    if (!this.isSave) {
      this.showModalSave(location);
      return false;
    }
    return true;
  };

  showModalSave = location => {
    this.setState({
      modalVisible: true,
      location,
    });
  };

  closeModalSave = () => {
    const { location } = this.state;
    const { history } = this.props;
    this.setState({
      modalVisible: false,
    });
    history.push({
      pathname: `..${location.pathname}`,
    });
  };

  handlePrompt = location => {
    if (!this.isSave) {
      this.showModalSave(location);
      return false;
    }
    return true;a
  };

  handleSave = () => {
    const { location } = this.state;
    const { history } = this.props;
    this.isSave = true;
    console.log(location.pathname, 'pathname75');
    history.push({
      pathname: `..${location.pathname}`,
    });
    this.setState({
      modalVisible: false,
    });
    this.saveAll();
  };

 <Prompt message={this.handlePrompt}/>
<Modal title="提示"
       visible={modalVisible}
       onCancel={this.closeModalSave}
       closable={false}
       centered
       footer={null}
>
<div>是否保存修改?</div>
<div>
      <Button onClick={this.closeModalSave}>
            不保存
      </Button>
       <Button onClick={this.handleSave}>
            保存
       </Button>
</div>
</Modal>

完美实现离开页面,路由拦截的同时,显示自定义模态框!


(完)

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