将OpenLayers 4与Angular 5一起使用 [英] Use OpenLayers 4 with Angular 5

问题描述

我正在尝试在Angular 5中使用OpenLayers 4.

I'm trying to use OpenLayers 4 in Angular 5.

基本上，我只是想从OpenLayers官方网站上实现 QuickStart 示例

Basically I just want to implement the QuickStart example from the official OpenLayers Site.

到目前为止我所做的:

1. npm install ol --save下载ol软件包
2. angular-cli.json 将这些行添加到angular-cli.json中.看到必须在Stackoverflow的另一个示例上完成此操作. ol.css文件存在. ol.js文件没有.因此，我不知道这是对还是错，但显然无法正常工作.

1. npm install ol --save to download the ol package
2. angular-cli.json added those lines to the angular-cli.json. Saw that this has to be done on another example on Stackoverflow. The ol.css file exists. The ol.js file doesnt. So I don't know if this is the right or the wrong way but it can clearly not work.

我的角度项目由3个组成部分组成:

My angular project consists of 3 components:

 -app
 --console
 --map
 --sidebar

 app.component.css
 app.compinent.html
 app.component.spec.ts
 app.component.ts
 app.module.ts

map.component.html

map.component.html

import { Component, OnInit } from '@angular/core';
import * as ol from '../../../node_modules/ol';

@Component({
  selector: 'app-map',
  templateUrl: './map.component.html',
  styleUrls: ['./map.component.css']
})
export class MapComponent implements OnInit {
  mapId: string;
  map: ol.Map = undefined;

  constructor() { }

  ngOnInit() {
    this.map = new ol.Map({
      target: this.mapId,
      layers: [
        new ol.layer.Tile({
          source: new ol.source.OSM(),
        }),
      ],
      view: new ol.View({
        center: ol.proj.fromLonLat([6.661594, 50.433237]),
        zoom: 3,
      })
    });
  }
}

谁能告诉我如何使其正常工作?

Can anyone tell how to get this working correctly?

推荐答案

已更新到Angular 8.x和OpenLayers 6.x:

安装ol并进行以下更改:

1.)在 html.index 中添加符合条件的CSS(确保CSS的版本与安装的ol的版本匹配):

1.) Add the accordant CSS in the html.index (make sure that the version of the CSS matches the installed version of ol) :

<link rel="stylesheet" href="https://openlayers.org/en/v6.1.1/css/ol.css" type="text/css">

另一种方法是在 angular.json 中的styles对象中引用CSS:

Another way is to reference the CSS in the styles object within the angular.json:

"styles": [
  "./node_modules/ol/ol.css",
  "src/styles.scss"
],

2.)在 app.component.ts 中创建地图:

2.) Create a map in app.component.ts:

import { AfterViewInit, Component } from '@angular/core';
import { defaults as defaultControls } from 'ol/control';

import Map from 'ol/Map';
import View from 'ol/View';
import TileLayer from 'ol/layer/Tile';
import XYZ from 'ol/source/XYZ';
import ZoomToExtent from 'ol/control/ZoomToExtent';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})

export class AppComponent implements AfterViewInit {

  map: Map;

  ngAfterViewInit() {
    this.map = new Map({
      target: 'map',
      layers: [
        new TileLayer({
          source: new XYZ({
            url: 'https://{a-c}.tile.openstreetmap.org/{z}/{x}/{y}.png'
          })
        })
      ],
      view: new View({
        center: [813079.7791264898, 5929220.284081122],
        zoom: 7
      }),
      controls: defaultControls().extend([
        new ZoomToExtent({
          extent: [
            813079.7791264898, 5929220.284081122,
            848966.9639063801, 5936863.986909639
          ]
        })
      ])
    });
  }
}

3.) app.component.css 中的某些样式:

3.) Some style in app.component.css:

.map {
  width: 100%;
  height: 100vh;
}

4.)最后是 app.component.html 中的标记:

4.) And finally the markup in app.component.html:

<div id="map" class="map"></div>

还可以随意查看我的 GitHub存储库.

如 Bhalchandra Bhosale 所述，最好在ngAfterViewInit内设置地图目标:

As stated by Bhalchandra Bhosale it might be even better to set the target of the map within ngAfterViewInit:

export class MapComponent implements OnInit, AfterViewInit {

  ...

  ngAfterViewInit() {
    this.map.setTarget('map');
  }
}

ol 5.2版本的旧答案:

Old answer for version 5.2 of ol:

ol 是适合OpenLayers的软件包.但是，您无需在 angular-cli.json 中添加任何内容.

随着最近的更新("ol": "^5.2.0")，导入OpenLayers的类和功能的方式发生了一些变化.

With the recent update ("ol": "^5.2.0") the way of importing classes and functions of OpenLayers changed a bit.

map.component.ts :

import { Component, OnInit } from '@angular/core';

import OlMap from 'ol/Map';
import OlXYZ from 'ol/source/XYZ';
import OlTileLayer from 'ol/layer/Tile';
import OlView from 'ol/View';

import { fromLonLat } from 'ol/proj';

@Component({
  selector: 'app-map',
  templateUrl: './map.component.html',
  styleUrls: ['./map.component.css']
})

export class MapComponent implements OnInit {

  map: OlMap;
  source: OlXYZ;
  layer: OlTileLayer;
  view: OlView;

  ngOnInit() {
    this.source = new OlXYZ({
      url: 'http://tile.osm.org/{z}/{x}/{y}.png'
    });

    this.layer = new OlTileLayer({
      source: this.source
    });

    this.view = new OlView({
      center: fromLonLat([6.661594, 50.433237]),
      zoom: 3
    });

    this.map = new OlMap({
      target: 'map',
      layers: [this.layer],
      view: this.view
    });
  }
}

map.component.html :

<div id="map" class="map"></div>

map.component.css :

.map {
  width: 100%;
  height: 100vh;
}

在 index.html 的header-标记内添加OpenLayers的CSS:

Add the CSS of OpenLayers within the header-tag of index.html:

<link rel="stylesheet" href="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.1.3/css/ol.css" type="text/css">
<style>html, body { margin: 0; }</style>

甚至更老的答案:

您的组件可能如下所示:

Your component might look like the following:

import {Component, OnInit} from '@angular/core';

import OlMap from 'ol/map';
import OlXYZ from 'ol/source/xyz';
import OlTileLayer from 'ol/layer/tile';
import OlView from 'ol/view';
import OlProj from 'ol/proj';

@Component({
  selector: 'app-map',
  templateUrl: './map.component.html',
  styleUrls: ['./map.component.css']
})

export class MapComponent implements OnInit {

  map: OlMap;
  source: OlXYZ;
  layer: OlTileLayer;
  view: OlView;

  constructor() {
  }

  ngOnInit() {
    this.source = new OlXYZ({
      url: 'http://tile.osm.org/{z}/{x}/{y}.png'
    });

    this.layer = new OlTileLayer({
      source: this.source
    });

    this.view = new OlView({
      center: OlProj.fromLonLat([6.661594, 50.433237]),
      zoom: 3
    });

    this.map = new OlMap({
      target: 'map',
      layers: [this.layer],
      view: this.view
    });
  }
}

CSS:

.map {
  width: 100%;
  height: 100vh;
}

HTML:

<div id="map" class="map"></div>

让我知道此解决方案是否适合您.

Let me know if this solution works for you.

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