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Counter.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Події</title>
<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>
<style>
#container {
padding: 50px;
background-color: #FFF
}
</style>
</head>
<body>
<div id="container"></div>
<script type="text/babel">
class Counter extends React.Component {
render() {
var textStyle = {
fontSize: 72,
fontFamily: "sans-serif",
color: "#333",
fontWeight: "bold"
};
return (
<div style={textStyle}>
{this.props.display}
</div>
);
}
}
class CounterParent extends React.Component {
constructor(props) {
super(props);
console.log("constructor: Default state time!");
this.state = {
count: 0
};
this.increase = this.increase.bind(this);
}
increase (e) {
var currentCount = this.state.count;
if(e.shiftKey){
currentCount +=2;
} else {
currentCount += 1;
}
this.setState({
count: currentCount
});
}
// збільшення на 2 при утриманні Shift і кліка миші
// ПОЧАТКОВИЙ РЕНДЕРІНГ
// Властивoсті по замовчуванні
// Отримання стану
// componentWillMount
// render
// componentDidMount
componentWillUpdate(newProps, newState) {
console.log("componentWillUpdate: Component is about to update!");
}
componentDidUpdate(currentProps, currentState) {
console.log("componentDidUpdate: Component just updated!");
}
componentWillMount(){
console.log("componentWillMount: Component is about to mount!");
}
componentDidMount(){
console.log("componentDidMount: Component just mounted!");
}
componentWillUnmount(){
console.log("componentWillUnmount: Component is about to be removed from the DOM!");
}
// ЗМІНА СТАНУ
// shouldComponentUpdate
// componentWillMount
// render
// componentDidMount
shouldComponentUpdate(newProps, newState) {
console.log("shouldComponentUpdate: Should component update?");
if(newState.count < 5) {
console.log("shouldComponentUpdate: Component should update!");
return true;
} else {
ReactDOM.unmountComponentAtNode(document.querySelector("#container"));
console.log("shouldComponentUpdate: Component should not update!");
return false;
}
}
// ЗМІНА ВЛАСТИВОСТЕЙ
// componentWillReceiveProps
// shouldComponentUpdate
// componentWillMount
// render
// componentDidMount
componentWillReceiveProps(newProps) {
console.log("componentWillReceiveProps: Component will get new props!");
}
render() {
var backgroundStyle = {
padding: 50,
border: "#3332px dotted",
backgroundColor: "#FFC53A",
width: 250,
height: 100,
borderRadius: 10,
textAlign: "center"
};
var buttonStyle = {
fontSize: "1em",
width: 30,
height: 30,
fontFamily: "sans-serif",
color: "#333",
fontWeght: "bold",
lineHeight: "3px"
};
return (
<div style={backgroundStyle}>
<Counter display={this.state.count}/>
<button onClick={this.increase} style={buttonStyle}>+</button>
</div>
);
}
}
// РОЗМОНТУВАННЯ
// componentWillUnmount
console.log("defaultProps: Default prop time!");
CounterParent.defaultProps = {
};
//виклик функції increase, коли відбувається подія onClick
ReactDOM.render(
<div>
<CounterParent/>
</div>,
document.querySelector("#container")
);
</script>
</body>
</html>