在不使用refs和手动修改DOM的情况下,使用React Leaflet向地图添加图例,可以通过以下步骤实现:
import { Map, TileLayer, LayersControl } from 'react-leaflet';
import 'leaflet/dist/leaflet.css';
class MapComponent extends React.Component {
constructor(props) {
super(props);
this.state = {
legendVisible: false
};
}
// ...
}
render() {
const { BaseLayer, Overlay } = LayersControl;
const { legendVisible } = this.state;
return (
<Map center={[51.505, -0.09]} zoom={13}>
<LayersControl position="topright">
<BaseLayer checked name="Base Layer">
<TileLayer url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png" />
</BaseLayer>
<Overlay checked={legendVisible} name="Legend">
{/* 在这里添加图例的内容 */}
</Overlay>
</LayersControl>
</Map>
);
}
const Legend = () => (
<div className="legend">
<div className="legend-item">
<span className="legend-color" style={{ backgroundColor: 'red' }}></span>
<span className="legend-label">Red</span>
</div>
<div className="legend-item">
<span className="legend-color" style={{ backgroundColor: 'blue' }}></span>
<span className="legend-label">Blue</span>
</div>
{/* 添加更多图例项 */}
</div>
);
render() {
// ...
return (
<Map center={[51.505, -0.09]} zoom={13}>
<LayersControl position="topright">
{/* ... */}
<Overlay checked={legendVisible} name="Legend">
{legendVisible && <Legend />}
</Overlay>
</LayersControl>
</Map>
);
}
这样,当图例的状态为true时,图例会被渲染到地图上。你可以根据需要自定义图例的样式和内容。
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