JavaScript侦听器-角度2区域
我在Google Maps对象中有一个JavaScript侦听器:JavaScript侦听器-角度2区域,javascript,angular,listener,angular2-zone,Javascript,Angular,Listener,Angular2 Zone,我在Google Maps对象中有一个JavaScript侦听器: map.data.addListener('click', (event) => { var mapElement = event.feature.getProperty('type'); switch(mapElement){ case 'cameras': var cameraID = event.feature.getProperty('trafficID'
map.data.addListener('click', (event) => {
var mapElement = event.feature.getProperty('type');
switch(mapElement){
case 'cameras':
var cameraID = event.feature.getProperty('trafficID');
this.cameraService.createCamera(cameraID);
break; ...
此“映射”侦听器调用名为“cameraService”的服务中的函数,该服务初始化相机。我有一个DOM对象,它使用Angular 2的ngIf指令来确定它是否存在:
<div *ngIf="cameraService.camera1 != null">
<app-camera></app-camera>
</div>
我的问题是:单击事件发生后,ngIf不会运行。控制台日志显示相机对象已创建,如果单击另一个元素(在地图之外),视图将更新(ngIf更改检测再次启动)
我假设这个问题与Angular 2区域有关-因此,当我单击Google地图时,它在Angular 2区域之外,当我单击另一个元素(Angular 2内)时,我重新进入Angular 2区域[如果我错了,请纠正我!]。。。如何在单击事件结束时手动触发ngIf或重新进入Angular 2区域以重新启动Angular 2更改检测?您可以使用
zone.run()
强制执行返回Angulars区域,也可以手动调用更改检测:
constructor(private zone:NgZone, private cdRef:ChangeDetectorRef) {}
map.data.addListener('click', (event) => {
this.zone.run(() => {
var mapElement = event.feature.getProperty('type');
switch(mapElement){
case 'cameras':
var cameraID = event.feature.getProperty('trafficID');
this.cameraService.createCamera(cameraID);
break; ...
});
}
或
map.data.addListener('click',(事件)=>{
var mapElement=event.feature.getProperty('type');
开关(mapElement){
“摄像机”案例:
var cameraID=event.feature.getProperty('trafficID');
this.cameraService.createCamera(cameraID);
this.cdRef.detectChanges();//太棒了!我最终使用了:this.ngZone.run(()=>this.cameraService.cameraClicked(station_key));这非常有效!
map.data.addListener('click', (event) => {
var mapElement = event.feature.getProperty('type');
switch(mapElement){
case 'cameras':
var cameraID = event.feature.getProperty('trafficID');
this.cameraService.createCamera(cameraID);
this.cdRef.detectChanges(); // <<<=== added
break; ...
}