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/**

* File: App.js

* "React State Example-1: Update state using 2 select elements."

* by Joe Dorocak (JoeCodeswell.com)

* Demonstrates changing state with 2 select elements

* Source Code Link: https://joecodeswell.wordpress.com/2018/09/25/react-state-example-1-update-state-using-2-select-elements/

* MIT License

* Copyright (c) [2018] [Joseph P. Dorocak]

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

* The above copyright notice and this permission notice shall be included in all

* copies or substantial portions of the Software.

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

* SOFTWARE.

* https://en.forums.wordpress.com/topic/posting-javascript-markdown-does-not-show/

import React, { Component } from 'react';

import logo from './logo.svg';

import './App.css';

let programmerList = ["Admiral Grace Hopper","Ada Lovelace","Donald Knuth","James Gosling","Guido van Rossum","Linus Torvalds"];

class App extends Component {

constructor() {

super();

this.state = {

counter: 0,

programmer_list: programmerList,

fmSelFrom: programmerList[0],

fmSelTo:programmerList[0]

};

}

handleFromChange = (event) => {

this.setState({

fmSelFrom: event.target.value

});

}

handleToChange = (event) => {

this.setState({

fmSelTo: event.target.value

});

}

render() {

// inside class App -> render(){ before return(

return (

/* begin out of the box jsx */

<h1 className="App-title">Welcome to React</h1>

</header>

To get started, edit <code>src/App.js</code> and save to reload.

</p>

{/* end out of the box jsx */}

{/* begin non out of the box jsx */}

<p>Programmer List</p>

{this.state.programmer_list.map( (itm,ix) => <p key={ix} value={itm} >ix:{ix}->itm:{itm}</p> ) }

</div>

<label>

Pick your FROM Programmer:

{this.state.programmer_list.map( (itm,ix) => <option key={ix} value={ix+":"+itm} >{itm}</option> ) }

</select>

</label>

<label>

Pick your TO Programmer:

{this.state.programmer_list.map( (itm,ix) => <option key={ix} value={itm} >{itm}</option> ) }

</select>

</label>

<p>this.state.fmSelFrom: {this.state.fmSelFrom}</p>

<p>this.state.fmSelTo: {this.state.fmSelTo}</p>

</div>

{/* end non out of the box jsx */}

</div>

/* end of <div className="App"> */

// inside class App -> render(){ ->return( -> after <div className="App"></div>

); // end render -> return

} // end render () code

}

export default App;

已保存差异

原始文本

打开文件

import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';

let programmerList =  ["Admiral Grace Hopper","Ada Lovelace","Donald Knuth","James Gosling","Guido van Rossum","Linus Torvalds"];

class App extends Component {
  constructor() {
    super();
    this.state = {
      counter: 0,
      programmer_list: programmerList,
      fmSelFrom: programmerList[0],
      fmSelTo:programmerList[0]
    };
  }
  handleFromChange = (event) => {
    this.setState({ 
      fmSelFrom: event.target.value     
    });
  }
  handleToChange = (event) => {
    this.setState({ 
      fmSelTo: event.target.value    
    });
  }
  render() {
    // inside class App -> render(){ before return(
    return (

/* begin out of the box jsx */
      <div className="App">
        <header className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h1 className="App-title">Welcome to React</h1>
        </header>
        <p className="App-intro">
          To get started, edit <code>src/App.js</code> and save to reload.
        </p>
        {/* end out of the box jsx */}
        {/* begin non out of the box jsx */}
        <div id="show-programmer-list">
          <p>Programmer List</p>
            {this.state.programmer_list.map(  (itm,ix) => <p key={ix} value={itm} >ix:{ix}->itm:{itm}</p> )   }          
        </div>

<div id="select-programmer-from-to">
        <label>
            Pick your FROM Programmer:        
            <select id="select-from"  value={this.value} onChange={this.handleFromChange} >
              {this.state.programmer_list.map(  (itm,ix) => <option key={ix} value={ix+":"+itm} >{itm}</option> )   }  
            </select>
        </label>
        <label>
          Pick your TO Programmer:         
          <select id="select-to" value={this.key} onChange={this.handleToChange} >
            {this.state.programmer_list.map(  (itm,ix) => <option key={ix} value={itm} >{itm}</option> )   }
          </select>
        </label>

<p>this.state.fmSelFrom: {this.state.fmSelFrom}</p>
        <p>this.state.fmSelTo: {this.state.fmSelTo}</p>

</div>
        {/* end non out of the box jsx */}
     
      </div> 
      /* end of <div className="App"> */

// inside class App -> render(){ ->return( -> after <div className="App"></div>

); // end render -> return
  } // end render () code
}

export default App;

更改后文本

打开文件

/**
 *  File: App.js
 *  "React State Example-1: Update state using 2 select elements."
 *  by Joe Dorocak (JoeCodeswell.com) 
 *  Demonstrates changing state with 2 select elements 
 * 
 *  Source Code Link: https://joecodeswell.wordpress.com/2018/09/25/react-state-example-1-update-state-using-2-select-elements/
 * 
 * MIT License
 * 
 * Copyright (c) [2018] [Joseph P. Dorocak]
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 *  https://en.forums.wordpress.com/topic/posting-javascript-markdown-does-not-show/
 * 
 *  
 */
 
import React, { Component } from 'react';
import logo from './logo.svg';
import './App.css';
 
let programmerList =  ["Admiral Grace Hopper","Ada Lovelace","Donald Knuth","James Gosling","Guido van Rossum","Linus Torvalds"];
 
class App extends Component {
  constructor() {
    super();
    this.state = {
      counter: 0,
      programmer_list: programmerList,
      fmSelFrom: programmerList[0],
      fmSelTo:programmerList[0]
    };
  }
  handleFromChange = (event) => {
    this.setState({ 
      fmSelFrom: event.target.value     
    });
  }
  handleToChange = (event) => {
    this.setState({ 
      fmSelTo: event.target.value    
    });
  }
  render() {
    // inside class App -> render(){ before return(
    return (
 
      /* begin out of the box jsx */
      <div className="App">
        <header className="App-header">
          <img src={logo} className="App-logo" alt="logo" />
          <h1 className="App-title">Welcome to React</h1>
        </header>
        <p className="App-intro">
          To get started, edit <code>src/App.js</code> and save to reload.
        </p>
        {/* end out of the box jsx */}
        {/* begin non out of the box jsx */}
        <div id="show-programmer-list">
          <p>Programmer List</p>
            {this.state.programmer_list.map(  (itm,ix) => <p key={ix} value={itm} >ix:{ix}->itm:{itm}</p> )   }          
        </div>
 
        <div id="select-programmer-from-to">
        <label>
            Pick your FROM Programmer:        
            <select id="select-from"  value={this.value} onChange={this.handleFromChange} >
              {this.state.programmer_list.map(  (itm,ix) => <option key={ix} value={ix+":"+itm} >{itm}</option> )   }  
            </select>
        </label>
        <label>
          Pick your TO Programmer:         
          <select id="select-to" value={this.key} onChange={this.handleToChange} >
            {this.state.programmer_list.map(  (itm,ix) => <option key={ix} value={itm} >{itm}</option> )   }
          </select>
        </label>
 
        <p>this.state.fmSelFrom: {this.state.fmSelFrom}</p>
        <p>this.state.fmSelTo: {this.state.fmSelTo}</p>
 
        </div>
        {/* end non out of the box jsx */}
      
      </div> 
      /* end of <div className="App"> */
 
      // inside class App -> render(){ ->return( -> after <div className="App"></div>
 
    ); // end render -> return
  } // end render () code
}
 
export default App;