Vue+Openlayer使用overlay实现弹窗弹出显示与关闭

场景

Vue+Openlayers实现地图上绘制线：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/121252960

在上面的基础上实现点击地图，弹窗显示并获取点击处的坐标，并实现坐标转换经纬度。

效果

加载显示地图的流程

Vue中使用Openlayers加载Geoserver发布的TileWMS：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/115916949

注：

博客：
https://blog.csdn.net/badao_liumang_qizhi
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实现

1、页面上添加弹窗的元素

<template>
    <div id="app">
      <div id="map" class="map"></div>
      <div id="popup" class="ol-popup">
        <a href="#" id="popup-closer" class="ol-popup-closer">X</a>
        <div id="popup-content" class="popup-content"></div>
      </div>
    </div>
</template>

2、添加弹窗样式

<style scoped>
.map {
   100%;
  height: 800px;
}
.ol-popup {
    position: absolute;
    background-color: white;
    -webkit-filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
    filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #cccccc;
    bottom: 12px;
    left: -50px;
}
.popup-content {
     400px;
}
.ol-popup-closer {
    text-decoration: none;
    position: absolute;
    top: 2px;
    right: 8px;
}
</style>

3、导入相关模块

//导入基本模块
import "ol/ol.css";
import Map from "ol/Map";
import Overlay from "ol/Overlay";
import View from "ol/View";
import { Point,LineString } from "ol/geom";
import Feature from "ol/Feature";
import { Icon,Style,Stroke} from "ol/style";
//导入相关模块
import { Tile as TileLayer , Vector as VectorLayer } from 'ol/layer'
import { TileWMS ,Vector as VectorSource } from 'ol/source'
import { toStringHDMS } from "ol/coordinate";
import { toLonLat } from "ol/proj";

4、声明overlay与容器

      overlay: null,
      container: null, // 弹框

5、在mounted中调用初始化地图的方法

  mounted() {
    this.initMap();
  },

在方法中获取到弹窗的节点DOM

      // 获取到弹框的节点DOM
      var container = document.getElementById("popup");
      var content = document.getElementById("popup-content");
      var closer = document.getElementById("popup-closer");

然后创建一个弹窗Overlay对象

      // 创建一个弹窗 Overlay 对象
      this.overlay = new Overlay({
          element: container, //绑定 Overlay 对象和 DOM 对象的
          autoPan: true, // 定义弹出窗口在边缘点击时候可能不完整 设置自动平移效果
          autoPanAnimation: {
              duration: 250 //自动平移效果的动画时间 9毫秒
          }
      });

6、创建弹窗对象并将弹窗添加到地图中

      this.map = new Map({
        //地图容器ID
        target: "map",
        //引入地图
        layers: [this.layer,this.lightLayer,this.houseLayer,this.lineLayer],
        view: new View({
          //地图中心点
          center: [987777.93778, 213834.81024],
          zoom: 12,
          minZoom:6, // 地图缩放最小级别
          maxZoom:19,
          rotation: 0.76
        }),
      });

      // 将弹窗添加到 map 地图中
      this.map.addOverlay(this.overlay);

7、监听地图的单击事件，在回调函数中获取坐标值并将内容赋值给dom

并且设置弹窗的位置就是当前鼠标点击的位置

      // 将弹窗添加到 map 地图中
      this.map.addOverlay(this.overlay);
      //必须 要重新赋值this,不然再回调函数中指针会变，overlay会undefined
      let _that = this;
      // 监听singleclick事件
      this.map.on('singleclick', function(e) {
        let coordinate = e.coordinate
        // 点击尺 （这里是尺(米)，并不是经纬度）;
        let hdms = toStringHDMS(toLonLat(e.coordinate)); // 转换为经纬度显示
        content.innerHTML = `
        <p>你点击了这里：</p>
        <p>经纬度：<p><code> ${hdms}  </code> <p>
        <p>坐标：</p>X：${coordinate[0]} &nbsp;&nbsp; Y: ${coordinate[1]}`;
        _that.overlay.setPosition(coordinate); //把 overlay 显示到指定的 x,y坐标
        console.log(e.coordinate)
        })

8、这里尤其要注意的是，单击事件的回调方法中要对overplay设置其显示位置

这里不能再直接使用this.overplay.setPosition了，因为在回调函数中指针会变，

此时会提示overlay为undefined。所以先重新赋值再使用

let _that = this;

_that.overlay.setPosition(coordinate); //把 overlay 显示到指定的 x,y坐标

7、设置弹窗关闭事件

将overlay对象的setPosition赋值为undefined即可隐藏。

      //弹窗关闭事件
      closer.onclick=function(){
        _that.overlay.setPosition(undefined);
        closer.blur();
        return false;
      };

8、完整示例代码

<template>
    <div id="app">
      <div id="map" class="map"></div>
      <div id="popup" class="ol-popup">
        <a href="#" id="popup-closer" class="ol-popup-closer">X</a>
        <div id="popup-content" class="popup-content"></div>
      </div>
    </div>
</template>

<script>
//导入基本模块
import "ol/ol.css";
import Map from "ol/Map";
import Overlay from "ol/Overlay";
import View from "ol/View";
import { Point,LineString } from "ol/geom";
import Feature from "ol/Feature";
import { Icon,Style,Stroke} from "ol/style";
//导入相关模块
import { Tile as TileLayer , Vector as VectorLayer } from 'ol/layer'
import { TileWMS ,Vector as VectorSource } from 'ol/source'
import { toStringHDMS } from "ol/coordinate";
import { toLonLat } from "ol/proj";
export default {
  name: "olMapImageWMSMulLayers",
  data() {
    return {
      map: null, // map地图
      layer:null, //地图图层
      lightLayer:null, //灯图层
      houseLayer:null, //房子图层
      lineLayer:null, //线图层
      lineSource:null, //线数据源
      overlay: null,
      container: null, // 弹框
      //红绿灯数据
      lightData:[
        {x:"987798.93778", y:"213885.81024"},
        {x:"987710.93778", y:"213810.81024"},
      ],
      //房子数据
      houseData:[
        {x:"986610.93778", y:"213885.81024"},
        {x:"986510.93778", y:"213810.81024"},
      ],
      //线的数据
      lineData:[
        [986434.4063822062, 215782.0959711917],
        [989701.5290279881,217149.84072807242],
        [990613.3107184113,215946.4192185118],
      ],
   };
  },
  mounted() {
    this.initMap();
    setInterval(() => {
      this.initLightData();
    }, 1000)
  },
  methods: {

    //初始化红绿灯数据
    initLightData(){
      this.lightLayer.getSource().clear();
      this.lightData.forEach((item, index) => {
          var feature = new Feature({
              geometry: new Point([Number(item.x), Number(item.y)]),
          });
          let url = "images/light.png";
          const zoom = this.map.getView().getZoom();
          let style = new Style({
                  image: new Icon({
                      scale: 0.15 * (zoom -13) ,
                      src: url,
                      anchor: [0.48, 0.52],
                  }),
              });
          feature.setStyle(style);
          this.lightLayer.getSource().addFeature(feature);
      });
    },

    //初始化房子数据
    initHouseData(){
      this.houseLayer.getSource().clear();
      this.houseData.forEach((item, index) => {
          var feature = new Feature({
              geometry: new Point([Number(item.x), Number(item.y)]),
          });
          let url = "images/house.png";
          let style = new Style({
                  image: new Icon({
                      scale: 0.3,
                      src: url,
                      anchor: [0.48, 0.52],
                  }),
              });
          feature.setStyle(style);
          this.houseLayer.getSource().addFeature(feature);
      });
    },

    //画线
    drawLine(){
      let pointData = this.lineData; // 所有点位信息
      //下边来添加一线feature
      var feature = new Feature({
          type: "lineStyle",
          geometry: new LineString(
              pointData // 线的坐标
          ),
      });
      let color = 'green';
      let lineStyle = new Style({
          stroke: new Stroke({
              color: color,
               4,
          }),
      });
      // 添加线的样式
      feature.setStyle(lineStyle);
      // 添加线的fature
      this.lineSource.addFeature(feature);
    },
    initMap() {

      // 获取到弹框的节点DOM
      var container = document.getElementById("popup");
      var content = document.getElementById("popup-content");
      var closer = document.getElementById("popup-closer");

      //地图图层
      this.layer = new TileLayer({
        source: new TileWMS({
          //不能设置为0，否则地图不展示。
          ratio: 1,
          url: "http://localhost:8000/geoserver/nyc/wms",
          params: {
            LAYERS: "nyc:nyc_roads",
            STYLES: "",
            VERSION: "1.1.1",
            tiled: true
          },
          serverType: "geoserver",
        }),
      });

      // 红绿灯的图层
      this.lightLayer = new VectorLayer({
          source: new VectorSource(),
      });
     
      //房子的图层
      this.houseLayer = new VectorLayer({
          source: new VectorSource(),
      });

      //线的图层
      this.lineSource = new VectorSource({ wrapX: false });
      this.lineLayer = new VectorLayer({
          source: this.lineSource,
      });

      // 创建一个弹窗 Overlay 对象
      this.overlay = new Overlay({
          element: container, //绑定 Overlay 对象和 DOM 对象的
          autoPan: true, // 定义弹出窗口在边缘点击时候可能不完整 设置自动平移效果
          autoPanAnimation: {
              duration: 250 //自动平移效果的动画时间 9毫秒
          }
      });

      this.map = new Map({
        //地图容器ID
        target: "map",
        //引入地图
        layers: [this.layer,this.lightLayer,this.houseLayer,this.lineLayer],
        view: new View({
          //地图中心点
          center: [987777.93778, 213834.81024],
          zoom: 12,
          minZoom:6, // 地图缩放最小级别
          maxZoom:19,
          rotation: 0.76
        }),
      });

      // 将弹窗添加到 map 地图中
      this.map.addOverlay(this.overlay);
      //必须 要重新赋值this,不然再回调函数中指针会变，overlay会undefined
      let _that = this;
      // 监听singleclick事件
      this.map.on('singleclick', function(e) {
        let coordinate = e.coordinate
        // 点击尺 （这里是尺(米)，并不是经纬度）;
        let hdms = toStringHDMS(toLonLat(e.coordinate)); // 转换为经纬度显示
        content.innerHTML = `
        <p>你点击了这里：</p>
        <p>经纬度：<p><code> ${hdms}  </code> <p>
        <p>坐标：</p>X：${coordinate[0]} &nbsp;&nbsp; Y: ${coordinate[1]}`;
        _that.overlay.setPosition(coordinate); //把 overlay 显示到指定的 x,y坐标
        console.log(e.coordinate)
        })
      //弹窗关闭事件
      closer.onclick=function(){
        _that.overlay.setPosition(undefined);
        closer.blur();
        return false;
      };
      this.initLightData();
      this.initHouseData();
      this.drawLine();

    },
  },
};
</script>

<style scoped>
.map {
   100%;
  height: 800px;
}
.ol-popup {
    position: absolute;
    background-color: white;
    -webkit-filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
    filter: drop-shadow(0 1px 4px rgba(0, 0, 0, 0.2));
    padding: 15px;
    border-radius: 10px;
    border: 1px solid #cccccc;
    bottom: 12px;
    left: -50px;
}
.popup-content {
     400px;
}
.ol-popup-closer {
    text-decoration: none;
    position: absolute;
    top: 2px;
    right: 8px;
}
</style>