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showing results for - "pass params react js"
Jona
23 Oct 2016
1//pass color from parent -> child
2
3App.js -> ColorPicker (Components/ColorPicker.js)
4
5/// parent App.js
6import ColorPicker from './Component/ColorPicker';
7
8class App extends Component {
9  
10   constructor(props) {
11        super(props);
12        this.state = {
13            color:  'red',
14        };
15    }
16  
17   render() {
18        return (
19			<div className="col">
20    			<ColorPicker color={ this.state.color } />     
21			</div>
22		)
23    }
24}export default App;        
25
26/// child ColorPicker
27import React, { PureComponent } from 'react';
28
29class ColorPicker extends PureComponent {  
30
31    constructor(props) {
32        super(props);
33        this.state = {
34            colors: ['red', 'green', 'blue', 'yellow', 'purple'],
35        };
36    }
37
38    render() {
39
40        var elementColors = this.state.colors.map((c, index) => {
41            return <span key={ index } 
42                         className={ this.props.color === c ? 'active squad ml-10' : 'squad ml-10'}
43                        }  // click into color c will pass params c to Bai11Practice.js
44                        >
45                   </span>
46        });
47}
48export default ColorPicker;    
49
50// ---------------------------------------
51
52//pass params from child -> parent
53// onClick => setActiveColor -> this.props.onReceiverColor(c);
54ColorPicker (Components/ColorPicker.js) -> App.js 
55
56/// child ColorPicker
57import React, { PureComponent } from 'react';
58
59class ColorPicker extends PureComponent {  
60
61    constructor(props) {
62        super(props);
63        this.state = {
64            colors: ['red', 'green', 'blue', 'yellow', 'purple'],
65        };
66    }
67  
68    setActiveColor = (c)  => {
69        this.props.onReceiverColor(c);
70    }
71
72    render() {
73
74        var elementColors = this.state.colors.map((c, index) => {
75            return <span key={ index } 
76                        onClick={ () => this.setActiveColor(c) }  // click into color c will pass params c to Bai11Practice.js
77                        >
78                   </span>
79        });
80}
81export default ColorPicker;        
82
83// Parent
84import React, { Component } from 'react';
85import ColorPicker from './Component/ColorPicker';
86
87class App extends Component {
88
89    onSetColor(c) {
90        alert(c);
91    }
92
93    render() {
94        return (
95		        <ColorPicker onReceiverColor={ this.onSetColor } />     
96        );
97    }
98}export default App;
99
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