61 lines
1.4 KiB
Markdown
61 lines
1.4 KiB
Markdown
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---
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title: Use State to Toggle an Element
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localeTitle: استخدم الدولة لتبديل عنصر
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---
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## استخدم الدولة لتبديل عنصر
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* يمكنك تبديل عنصر عن طريق فحص وتغيير حالته.
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## تلميح 1:
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* تذكر أن تربط `this` بمنشئ الطريقة.
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` this.toggleVisibility = this.toggleVisibility.bind(this);
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`
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## تلميح 2:
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* تذكر ، يمكنك استخدام وظيفة JavaScript للتحقق من حالة عنصر ما.
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## حل:
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`class MyComponent extends React.Component {
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constructor(props) {
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super(props);
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this.state = {
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visibility: false
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};
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// change code below this line
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this.toggleVisibility = this.toggleVisibility.bind(this);
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// change code above this line
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}
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// change code below this line
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toggleVisibility() {
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if (this.state.visibility == true) {
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this.setState({
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visibility: false
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});} else {
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this.setState({
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visibility: true
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})
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}
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}
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// change code above this line
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render() {
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if (this.state.visibility) {
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return (
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<div>
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<button onClick={this.toggleVisibility}>Click Me</button>
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<h1>Now you see me!</h1>
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</div>
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);
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} else {
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return (
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<div>
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<button onClick={this.toggleVisibility}>Click Me</button>
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</div>
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);
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}
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}
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};
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`
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