通過僅傳遞一次道具多次執行狀態和數組操作

Question

我是React的新手，這讓我很困惑。 我有一個具有數組的根組件，並且正在將函數ADD和DELETE作為道具傳遞給子組件ui_forms 。 在子組件中，我接受輸入參數，並根據按下的按鈕從數組中推送或刪除數組。 但是，我似乎不能多次執行推/刪除操作，因為我想我在根組件中只注入了一次子組件。

是否有機會通過僅發送一次道具來執行用戶想要的多次推送或刪除操作？

謝謝

App.js

import FormsMap from './form_map';

class App extends Component {
  state = {
    maps : [
      {'regno' : 'Karan', 'id' : 1},
      {regno : 'Sahil', 'id' : 2},
      {'regno' : 'Rahul', id : 4},
      {regno : 'Mohit', id : 5},
      {regno : 'Kartik', id : 3}
    ]
  };

   function_as_props(list1) {
      console.log(this.state.maps);
      let ninja = [...this.state.maps];
      console.log(ninja);
      ninja.push({"regno" : list1, "id" : Math.random()*10});

      this.setState({
        maps : ninja 
      });
    console.log(ninja);


    function_as_props1(name) {
       let t = this.state.maps.indexOf(name);  
       let x = this.state.maps.splice(t,1);
       console.log(x);
       this.setState({
         maps : x
       });
       console.log(this.state.maps);
    }
  }

  render() {
      const p = this.state.maps.map(list => {
        return(
           <div key={list.id}> {list.regno} </div>
        );
       })

 return(
   <FormsMap transpose = {this.function_as_props.bind(this)}  traverse ={this.function_as_props1.bind(this)} /> <br />
 );


} 
}

export default app;

form_map.js

import React, { Component } from 'react';

class FormsMap extends Component {
    state = {
        name : null,
        age : null,
        hobby : null
    };

    changes(e) {
        this.setState({
            [e.target.id] : e.target.value
        });
    }

    handle = (e) => {
        e.preventDefault();
        console.log(this.state);
        this.props.transpose(this.state.name);
    }

    dels = (e) => {
        this.setState({
            [e.target.id] : e.target.value
        });
    }

    del_button(e) {
        e.preventDefault();
        //console.log(this.state.name);
        this.props.traverse(this.state.name);
    }
    render() {
        return(
            <React.Fragment>
            <form onSubmit={this.handle}>   {/* After entering all info, Press Enter*/}
                <label htmlFor="labels"> Name : </label>  
                <input type="text" id="name" placeholder="Your name goes here..." onChange={this.changes.bind(this)} />
                <label htmlFor="labels"> Age : </label>  
                <input type="text" id="age" placeholder="Your age goes here..." onChange={this.changes.bind(this)} />
                <label htmlFor="labels"> Hobby : </label>  
                <input type="text" id="hobby" placeholder="Your hobby goes here..." onChange={this.changes.bind(this)} /> <br /><br />
                <input type="submit" value="SUBMIT" /><br /><br />
            </form>

            <input type="text" id="name" placeholder="Enter name to delete..." onChange={this.dels} />   <button onClick={this.del_button.bind(this)}> DELETE </button>
            </React.Fragment>

        );
    }
}

export default FormsMap;

Answer 1

嘗試這個

---

App.js

import React, { Component } from "react";
import FormsMap from "./components/FormsMap";

class App extends Component {
  constructor(props) {
    super(props);
    this.state = {
      maps: [
        { regno: "Karan", id: 1 },
        { regno: "Sahil", id: 2 },
        { regno: "Rahul", id: 4 },
        { regno: "Mohit", id: 5 },
        { regno: "Kartik", id: 3 }
      ]
    };
  }
  function_as_props(list1) {
    let ninja = this.state.maps.concat({
      regno: list1,
      id: Math.random() * 10
    });
    this.setState({ maps: ninja });
  }
  function_as_props1(name) {
    let x = this.state.maps.filter(
      list => list.regno.toLocaleLowerCase() !== name.toLocaleLowerCase()
    );
    this.setState({
      maps: x
    });
  }
  render() {
    return (
      <React.Fragment>
        {this.state.maps.map(list => <div key={list.id}>{list.regno}</div>)}
        <FormsMap
          transpose={this.function_as_props.bind(this)}
          traverse={this.function_as_props1.bind(this)}
        />
      </React.Fragment>
    );
  }
}

export default App;

---

FormsMap.js

import React, { Component } from "react";

class FormsMap extends Component {
  state = {
    name: null,
    age: null,
    hobby: null
  };

  changes(e) {
    this.setState({
      [e.target.id]: e.target.value
    });
  }

  handle = e => {
    e.preventDefault();
    this.props.transpose(this.state.name);
  };

  dels = e => {
    this.setState({
      [e.target.id]: e.target.value
    });
  };

  del_button(e) {
    e.preventDefault();
    this.props.traverse(this.state.name);
  }
  render() {
    return (
      <React.Fragment>
        <form onSubmit={this.handle}>
          {" "}
          {/* After entering all info, Press Enter*/}
          <label htmlFor="labels"> Name : </label>
          <input
            type="text"
            id="name"
            placeholder="Your name goes here..."
            onChange={this.changes.bind(this)}
          />
          <label htmlFor="labels"> Age : </label>
          <input
            type="text"
            id="age"
            placeholder="Your age goes here..."
            onChange={this.changes.bind(this)}
          />
          <label htmlFor="labels"> Hobby : </label>
          <input
            type="text"
            id="hobby"
            placeholder="Your hobby goes here..."
            onChange={this.changes.bind(this)}
          />{" "}
          <br />
          <br />
          <input type="submit" value="SUBMIT" />
          <br />
          <br />
        </form>
        <input
          type="text"
          id="name"
          placeholder="Enter name to delete..."
          onChange={this.dels}
        />{" "}
        <button onClick={this.del_button.bind(this)}> DELETE </button>
      </React.Fragment>
    );
  }
}

export default FormsMap;

---

這是演示： https : //codesandbox.io/s/xl97xm6zpo