ol (OpenLayers) Beginner

Official documentation: OpenLayers - Welcome

What I came into contact with is that the map is used in the project after downloading it using npm as a plug-in.

1. In the map, first encapsulate and expose a method to mount on Vue

import WhrdMap from './whrd-map/WhrdMap.vue'
import { optConfig } from './whrd-map/option.config'

WhrdMap.install = function (Vue, opts = {}) {
  optConfig.request = opts.request || window.axios

  Vue.component(WhrdMap.name, WhrdMap)

  Vue.prototype.$mapEventHub = Vue.prototype.$mapEventHub || new Vue()
}

export default WhrdMap

 2. After installing the plug-in in the project, trigger the method exposed by the map in the used file, and the value that needs to be assigned

this.$mapEventHub.$emit("setzoom-popup",15)

3. Subscribe on the map page

this.doSubscribe("setzoom-popup", this.setZoomAndonEvent);

4. Define the method trigger of the subscription

 doSubscribe(message, callback) {
      // 订阅
      this.$mapEventHub.$on(message, callback);
      // 取消订阅 - 回收处理
      this.$once("hook:beforeDestroy", () => {
        this.$mapEventHub.$off(message, callback);
      });
    },

5. Define a method Here is the built-in method of ol to operate on the map

    setZoomAndonEvent(zoom) {
      this.showZoom = zoom;
      let map = this.getMap();
      let mapView = (map && map.getView()) || null;
      if (mapView) {
        mapView.on("change:resolution", this.resolutionChange);
      }
    },