我是新来的离子2。我遇到了一个问题。一旦我使用map
定义var map;
它在loadMap()
内部工作良好。但是如果我定义了像map:any;
这样的映射,它就不工作了。抛出这样的错误。
错误:uncaught(in promise):typeerror:未定义不是对象
(正在评估“this.map”)
import { Component } from '@angular/core';
import { NavController,Platform } from 'ionic-angular';
import { Geolocation } from 'ionic-native';
import {DataService} from '../../providers/data-service';
declare var L:any;
@Component({
selector: 'page-my-map',
templateUrl: 'my-map.html',
providers:[DataService]
})
export class MyMap {
public data: any;
map:any=null;
markersLayer;
myPositionLayer;
myCircleLayer;
showingon;
LeafIconMe;
LeafIcon;
constructor(platform: Platform, public dataService: DataService) {
platform.ready().then(() => {
Geolocation.getCurrentPosition().then((resp) => {
});
this.loadMap();
this.loadData();
});
}
loadMap(){
this.map = L.map('map', {}).setView([40.980963, 29.0966243], 10);
L.tileLayer(tileURL, {
maxZoom: 18,
attribution: ''
}).addTo(this.map);
this.map.locate({ setView: true, maxZoom: 16 });
this.dataService.getData()
.then(data => {
this.data = data;
this.data.forEach(function(veri){
console.log(veri.lat);
L.marker([veri.lat, veri.lon]).addTo(this.map);
})
});
console.log("map"+this.map);
}
loadData(){
console.log("data"+this.map);
}
}
我的新产品管理清单如下。
npm list --depth=0
msson@ /Users/baris/ionic2/denden/msson
├── @angular/common@2.0.0
├── @angular/compiler@2.0.0
├── @angular/compiler-cli@0.6.2
├── @angular/core@2.0.0
├── @angular/forms@2.0.0
├── @angular/http@2.0.0
├── @angular/platform-browser@2.0.0
├── @angular/platform-browser-dynamic@2.0.0
├── @angular/platform-server@2.0.0
├── @ionic/app-scripts@0.0.36
├── @ionic/storage@1.0.3
├── ionic-angular@2.0.0-rc.1
├── ionic-native@2.2.3
├── ionicons@3.0.0
├── rxjs@5.0.0-beta.12
├── typescript@2.0.3
└── zone.js@0.6.21
你能给我一些解决这个问题的建议吗?提前谢谢..
最佳答案
this.data.forEach(function(veri){
console.log(veri.lat);
L.marker([veri.lat, veri.lon]).addTo(this.map);
})
您需要使用arrow function(而不是
function
)来保留this
上下文this.data.forEach((veri) => {
console.log(veri.lat);
L.marker([veri.lat, veri.lon]).addTo(this.map);
})