【发布时间】：2016-11-14 23:58:41
【问题描述】：
我有一个按钮组件，它必须在事件点击时调用函数：
<button pButton type="button" label="Add EchoBeacon" (click)="insertPoint()">
constructor(private mappaService: MappaService) {}
...
insertPoint() {
this.map.removeInteraction(this.interaction);
this.select.getFeatures().clear();
this.map.removeInteraction(this.select);
this.interaction = new ol.interaction.Draw({
type: /** @type {ol.geom.GeometryType} */ 'Point',
source: this.echoBeacons.getSource()
});
this.map.addInteraction(this.interaction);
this.interaction.on('drawend', function(e) {
var feature = e.feature;
var geometry = feature.getGeometry();
this.coordinates = geometry.getCoordinates();
this.mappaService.savePoint(this.coordinates[0], this.coordinates[1])
.subscribe(
data => console.log('Added'),
error => console.error('Error: ' + error),
() => console.log('Completed!')
);
}
这是方法服务：
savePoint(x: number, y :number): Observable<any[]>{
let headers = new Headers({ 'Content-Type': 'application/json' });
let options = new RequestOptions({ headers: headers });
let serverPostDbUrl ="http://172.16.32.1:3000/beacon";
let body = `{"x": ${x}, "y": ${y}}`;
return this.http.post(`${serverPostDbUrl}`, body, options)
.map((res:Response) => res.json())
.catch((error:any) => Observable.throw(error.json().error || "Server error"));
}
但是当我点击按钮时，控制台会记录我“无法读取未定义的属性”，例如 mappaService 未在 insertPoint() 函数中定义
【问题讨论】：
标签： javascript angular typescript onclick http-post