81 lines
2.2 KiB
Markdown
81 lines
2.2 KiB
Markdown
### Tooltip
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Renders a tooltip component.
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Set the `state` of the component to `show: false` initially, define an object, `style`, to hold the styles for individual components and their states.
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Create a method, `toggleTooltip`, which uses `this.setState` to change the state's `show` property from `true` to `false` and vice versa.
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Bind `showTooltip` and `hideTooltip` to the component's context with the respective values of `true` and `false`.
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In the `render()` method, compute if the tooltip should be shown or hidden, render the content of the tooltip and bind the `onMouseEnter` and `onMouseLeave` events to `showTooltip` and `hideTooltip` respectively.
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```jsx
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class Tooltip 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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show: false
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};
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this.style = {
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tooltip: {
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position: 'relative',
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backgroundColor: "rgba(0,0,0,0.7)",
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color: "white",
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visibility: "hidden",
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width: "fit-content",
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padding: 5,
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borderRadius: 5
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},
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tooltipArrow: {
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position: 'absolute',
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top: '100%',
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left: '50%',
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borderWidth: 5,
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borderStyle: 'solid',
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borderColor: "rgba(0,0,0,0.7) transparent transparent",
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},
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visible: {
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visibility: "visible"
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},
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};
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this.showTooltip = this.toggleTooltip.bind(this, true);
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this.hideTooltip = this.toggleTooltip.bind(this, false);
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}
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toggleTooltip = tooltipState => {
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this.setState({
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show: tooltipState
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});
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};
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render() {
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const { children, text, ...rest } = this.props;
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const { show } = this.state;
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const { visible, tooltip, tooltipArrow } = this.style;
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const showTooltip = show ? visible : {};
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return (
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<div>
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<div style={{ ...tooltip, ...showTooltip }}>
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{text}
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<span style={tooltipArrow}/>
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</div>
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<div {...rest} onMouseEnter={this.showTooltip} onMouseLeave={this.hideTooltip}>
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{children}
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</div>
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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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```jsx
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ReactDOM.render(
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<Tooltip text='Simple tooltip'>
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<button>Hover me!</button>
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</Tooltip>,
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document.getElementById('root')
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);
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```
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<!-- tags: visual,state,children,class -->
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<!-- expertise: 1 -->
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