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不呈现组件onClick

reactjs javascript

strumpy_strudel · 技术社区 · 7 年前

我尝试渲染的组件:

import React, { Component } from 'react';

export default class QueryPrint extends Component {

    render() {
        console.log('working');

        return (
            <div>Hello</div>
        )
    }

}

尝试调用它的组件:

import React, { Component } from 'react';
import { connect } from 'react-redux';

import {
    Button,

} from 'reactstrap';

import QueryPrint from './bq_print';

class QueryResults extends Component {
    constructor(props) {
        super(props);
        this.print = this.print.bind(this);
    }

    print() {
        console.log('Clicked');
        return (
            <QueryPrint />
        );
    }

    render() {
        return (
            <Button 
                className='cuts-btn' 
                color='success' 
                onClick={this.print}
            >
                Print
            </Button>
        )
    }
}

function mapStateToProps(state) {
    return {
        query_data: state.results.query_data
    }
}

export default connect (mapStateToProps, null)(QueryResults);

console.log('clicked') 正在工作,但是应该在该方法中呈现的组件没有——没有 console.log('working') 或 <div> .

2 回复 | 直到 7 年前

Nicholas Tower 7 年前

从单击回调返回的内容无效。如果要渲染某个对象,请在render方法中执行此操作。click回调的任务是调用this.setState(),然后它将启动渲染。

也许是这样的:

class QueryResults extends Component {
  constructor(props) {
    super(props);
    this.print = this.print.bind(this);
    this.state = {
      queryPrint: false,
    }
  }

  print() {
    console.log('Clicked');
    this.setState({ queryPrint: true })
  }

  render() {
    const { queryPrint } = this.state;
    return (
      <React.Fragment>
        {queryPrint && <QueryPrint />}
        <Button 
          className='cuts-btn' 
          color='success' 
          onClick={this.print}
        >
          Print
        </Button>
      </React.Fragment>
    )
  }
}