我正在尝试在已挂载的组件中的componentDidUpdate
内检测属性是否更改。我有一个测试(下面代码中的refreshData
)表现良好。是否可以以某种方式传递props,使它们不被componentDidUpdate(prevProps)
检测到?
在component.js中:
componentDidUpdate(prevProps){
//works fine
if ( this.props.refreshData !== prevProps.refreshData ) {
if ( this.props.refreshData )
this.refreshData();
}
//these two arent calling
if ( this.props.selectedCountries !== prevProps.selectedCountries ) {
if ( this.props.selectedCountries )
console.log('updated selected countries');
}
if ( this.props.selectedLocations !== prevProps.selectedLocations ) {
console.log('updated selected locations');
}
}
在 App.js 中传递 props 的方式如下:
selectLocation = (id, type, lng, lat, polydata, name, clear = false) => {
//console.log(type);
//console.log(lng);
//console.log(lat);
//console.log(polydata);
let selectedType = 'selected' + type;
let previousState = [];
if (clear) {
this.setState({
selectedCountries: [],
selectedLocations: [],
selectedServices: [],
selectedPoints: [],
mapCenter: [lng, lat],
locationGeoCoords: [polydata]
})
previousState.push(id);
} else {
previousState = this.state[selectedType];
if (previousState.indexOf(id) === -1) {
//push id
previousState.push(id);
} else {
//remove id
var index = previousState.indexOf(id)
previousState.splice(index, 1);
}
}
if (type === "Countries") {
this.setState({
selectedCountries: previousState,
refreshData: true,
})
} else if (type === "Locations") {
this.setState({
selectedLocations: previousState,
refreshData: true
})
} else if (type === "Points") {
this.setState({
selectedPoints: previousState,
refreshData: true
})
}
}
render() {
return (
<component
selectedCountries={this.state.selectedCountries}
selectedLocations={this.state.selectedLocations}
refreshData={this.state.refreshData} />
}
}