[英]Angular2 two-way binding stop work after google maps callback
我正在進行角度2應用。 我有一個谷歌地圖,自動完成。 我有一個輸入(使用谷歌自動完成)和一個搜索按鈕。 當我點擊搜索按鈕時,我將輸入數據發送到谷歌地理編碼,並在地圖上放置一個標記。 這聽起來很簡單,但在此之后,angular2數據綁定才停止工作。 輸入沒有得到格式化的地址,addressIsValid沒有打開true。
HTML:
<div class="input-group">
<input autocorrect="off" autocapitalize="off" spellcheck="off" type="text"
class="form-control" [(ngModel)]="addressInput" #search id="address" (keydown)="addressChanged()">
<div class="input-group-btn">
<button id="addressSubmitButton" type="submit" class="btn btn-default" [class.btn-success]="addressIsValid"
(click)="submited(search.value)">
{{ (addressIsValid ? 'addressInput.success' : 'addressInput.search') | translate }}
</button>
</div>
碼:
export class AddressInputComponent implements OnInit {
public map: google.maps.Map;
public autocomplete: google.maps.places.Autocomplete;
private geocoder: google.maps.Geocoder = new google.maps.Geocoder();
public marker: google.maps.Marker;
public defaultZoom: number;
public defaultLat: number;
public defaultLng: number;
public errorCode: number;
private addressIsValid: boolean;
@Input('address') private addressInput: string;
@Output() addressUpdated: EventEmitter<string> = new EventEmitter();
@ViewChild("search")
public searchElementRef: ElementRef;
constructor() {
this.addressIsValid = false;
}
ngOnInit() {
this.defaultZoom = 7;
this.defaultLat = 47.338941;
this.defaultLng = 19.396167;
this.errorCode = null;
this.autocomplete = new google.maps.places.Autocomplete(this.searchElementRef.nativeElement, {
types: ["address"]
});
this._setMapToDefault();
this.autocomplete.bindTo('bounds', this.map);
this.autocomplete.addListener('place_changed', () => {
this.addressInput = this.autocomplete.getPlace().formatted_address;
})
}
private _setMapToDefault() {
this.map = new google.maps.Map(document.getElementById('map'), {
center: {lat: this.defaultLat, lng: this.defaultLng},
zoom: this.defaultZoom,
scrollwheel: false,
});
this.marker = new google.maps.Marker();
this.marker.setMap(this.map);
}
submited() {
this.geocoder.geocode( { 'address': this.addressInput}, (results, status) => {
if (status == google.maps.GeocoderStatus.OK) {
setInterval(this._changeInput(results[0]), 200);
} else {
this.addressIsValid = false;
this.errorCode = 1;
this._setMapToDefault();
}
});
}
private _changeInput(result) {
this.errorCode = null;
if (result.address_components[0].types[0] != "street_number") {
this.addressIsValid = false;
this.errorCode = 2;
this._setMapToDefault();
return;
}
// jQuery('#address').val(result.formatted_address);
this.addressInput = result.formatted_address;
this.addressUpdated.emit(this.addressInput);
this.addressIsValid = true;
this.map.setCenter(result.geometry.location);
this.map.setZoom(17);
this.marker.setPosition(result.geometry.location);
this.marker.setVisible(true);
}
private addressChanged() {
if (this.addressIsValid == true) {
this.addressIsValid = false;
this._setMapToDefault();
}
}
}
由於google.maps
使用自己的事件/ addListener調用集,因此不會觸發更改檢測。 這些事件不會被zone.js
稱為猴子修補,因此不會在Angular區域中運行,這在邏輯上不會觸發更改檢測周期。
因此,您可以通過在組件中注入ngZone
服務來解決此問題,您可以使用run
方法重新進入角度區域:
constructor(private ngZone: NgZone) {}
ngOnInit() {
//...
this.autocomplete.addListener('place_changed', () => {
this.ngZone.run(() => {
this.addressInput = this.autocomplete.getPlace().formatted_address;
});
})
}
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