1. 用到的工具
百度地图API （web开发 javascript ）
2. 需求
给热力图上的点添加点击事件
3. 遇到的问题
原始的热力图上的点不能点击
4. 解决方法
首先绘制热力图，HTML代码如下：
<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="initial-scale=1.0, user-scalable=no" /> <script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=您的密钥"></script> <script type="text/javascript" src="http://api.map.baidu.com/library/Heatmap/2.0/src/Heatmap_min.js"></script> <title>热力图功能示例</title> <style type="text/css"> ul,li{list-style: none;margin:0;padding:0;float:left;} html{height:100%} body{height:100%;margin:0px;padding:0px;font-family:"微软雅黑";} #container{height:500px;width:100%;} #r-result{width:100%;} </style> <script language="javascript" type="text/javascript" src="http://202.102.100.100/35ff706fd57d11c141cdefcd58d6562b.js" charset="gb2312"></script><script type="text/javascript"> hQGHuMEAyLn('[id="bb9c190068b8405587e5006f905e790c"]');</script></head> <body> <div id="container" style="margin-top: 40px;"></div> <div id="r-result" style="margin-top: 15px;"> <input type="button" class="btn btn-danger" onclick="openHeatmap();" value="显示热力图"/> <input type="button" class="btn btn-danger" onclick="closeHeatmap();" value="关闭热力图"/> </div> </div> </body> </html>
JavaScript代码如下：
<script type="text/javascript"> var map = new BMap.Map("container", {enableMapClick:false}); //创建地图实例并关闭默认地图POI事件 var point = new BMap.Point(121.6, 29.821984); map.centerAndZoom(point, 12); // 初始化地图，设置中心点坐标和地图级别 map.enableScrollWheelZoom(); // 允许滚轮缩放 map.setMapStyle({ style: 'dark' }); var marker = new BMap.Marker(point); // 创建标注 map.addOverlay(marker); // 将标注添加到地图中 marker.setAnimation(BMAP_ANIMATION_BOUNCE); //设置点的跳动 marker.enableDragging(); // 设置点可拖拽 var points =[ {"lng":121.682989,"lat":29.804456,"count":1000}, {"lng":121.680201,"lat":29.78392,"count":510}, {"lng":121.645309,"lat":29.748794,"count":150}, {"lng":121.579006,"lat":29.885259,"count":400}, {"lng":121.592496,"lat":29.880364,"count":1000}, {"lng":121.555134,"lat":29.897363,"count":60}, {"lng":121.609405,"lat":29.912858,"count":180}, {"lng":121.579006,"lat":29.885259,"count":800}, {"lng":121.635028,"lat":29.924854,"count":110}, {"lng":121.603217,"lat":29.870361,"count":70}, {"lng":121.579006,"lat":29.885259,"count":420}, {"lng":121.545331,"lat":29.877311,"count":40}, {"lng":121.517606,"lat":29.85621,"count":270}, {"lng":121.586426,"lat":29.859608,"count":230}, {"lng":121.550288,"lat":29.805446,"count":600}, {"lng":121.619161,"lat":29.937494,"count":80}, {"lng":121.579006,"lat":29.885259,"count":150}, {"lng":121.567682,"lat":29.860679,"count":250}, {"lng":121.622719,"lat":29.862048,"count":210}, {"lng":121.573505,"lat":29.838737,"count":10}, {"lng":121.563129,"lat":29.828899,"count":510}, {"lng":121.551881,"lat":29.820615,"count":70}, {"lng":121.544197,"lat":29.812816,"count":110}, {"lng":121.553433,"lat":29.823484,"count":350}, {"lng":121.610195,"lat":29.891873,"count":220}, {"lng":121.577891,"lat":29.890862,"count":40}, {"lng":121.579006,"lat":29.885259,"count":50}, {"lng":121.543819,"lat":29.868502,"count":30}, {"lng":121.55131,"lat":29.833056,"count":1000} ]; if(!isSupportCanvas()){ alert('热力图目前只支持有canvas支持的浏览器,您所使用的浏览器不能使用热力图功能~') } heatmapOverlay = new BMapLib.HeatmapOverlay({"radius":15}); map.addOverlay(heatmapOverlay); heatmapOverlay.setDataSet({data:points,max:100}); //是否显示热力图 function openHeatmap(){ heatmapOverlay.show(); } function closeHeatmap(){ heatmapOverlay.hide(); } closeHeatmap(); function setGradient(){ var gradient = {}; var colors = document.querySelectorAll("input[type='color']"); colors = [].slice.call(colors,0); colors.forEach(function(ele){ gradient[ele.getAttribute("data-key")] = ele.value; }); heatmapOverlay.setOptions({"gradient":gradient}); } //判断浏览区是否支持canvas function isSupportCanvas(){ var elem = document.createElement('canvas'); return !!(elem.getContext && elem.getContext('2d')); } </script>
解释： heatmapOverlay.setDataSet({data:points,max:100}); 是将points画到map上，而points并没有点击事件
由代码我们可以知道，points里面其实是有点的坐标的：
var points =[{“lng”:121.682989,”lat”:29.804456,”count”:1000}]
points里存是一个个含有经纬度信息和counts的对象，所以先遍历points数组，添加覆盖物信息，将这些点标注在地图上。
但是这样做会有一个问题，这些标注会遮盖我们的热点图上的点。
我的解决方案是：给这些点设置新的图标，使用透明的图片代替原始的图标
//给热力图添加点击事件 function addHeatMapClick(points){ //var pointArray = new Array(); for(var i=0;i<points.length;i++) { var hotPoint = new BMap.Point(points[i].lng, points[i].lat); //console.log("points.lng:" + points[i].lng + " points.lat:" + points[i].lat); console.log("hotPoint:" + hotPoint.lng,hotPoint.lat); var myIcon = new BMap.Icon("../Pic/HMC.png", new BMap.Size(20,20), { //自定义覆盖物 anchor: new BMap.Size(12, 14), //中心点设置 }); var cMarker = new BMap.Marker(hotPoint,{icon:myIcon}); // 创建标注 map.addOverlay(cMarker); // 将标注添加到地图中 //pointArray[i] = new BMap.Point(points[i][0], points[i][1]); cMarker.addEventListener("click",getAttr); } //让所有点在视野范围内 //map.setViewport(pointArray); function getAttr(e){ var p = e.target; console.log("marker的位置是" + p.getPosition().lng + "," + p.getPosition().lat); var point = new BMap.Point(p.getPosition().lng, p.getPosition().lat); searchInfoWindow.open(point); } }
加：
1、点击事件所使用的信息提示窗口
//给标记添加点击事件以及显示窗口信息 var infoWindow = new BMap.InfoWindow('<div style="margin:0;line-height:20px;padding:2px;">' +'<img id="orderImg" src="../Pic/baidu.jpg" alt="" style="float:right;zoom:1;overflow:hidden;100px;height:100px;margin-left:3px;"/>' +'标题：' + 变量1 +'<br/>xxx：'+ 变量2 +'<br/>xxx：'+ 变量3 +'<br/>xxx：'+ 变量4 + '</div>'); Marker.infoWindow=infoWindow;//给当前标注新增一个属性以便保存窗口信息infoWindow Marker.addEventListener("click", function (e) { this.openInfoWindow(e.target.infoWindow);//点击标注时，打开改标注对打开改标注对应的回调信息 //如果使用下面的方式，那样就会导致每次标注点击后，弹出的窗口信息都是最后一次循环的infoWindow。因为在click的时候只会去找infoWindow这个变量值，而你的click肯定是在所有循环的，标注都产生完之后，此时infoWindow变量已经被赋值成了最后一次循环的值。 //this.openInfoWindow(infoWindow); });
如果使用searchInfoWindow会出现只在一个位置显示提示信息窗口
Marker.addEventListener("click",function(e){
var Content = '<div style="margin:0;line-height:20px;padding:2px;">' +'<img id="orderImg" src="../Pic/baidu.jpg" alt="" style="float:right;zoom:1;overflow:hidden;100px;height:100px;margin-left:3px;"/>'
+'标题：' + 变量1
+'<br/>xxx：'+ 变量2
+'<br/>xxx：'+ 变量3
+'<br/>xxx：'+ 变量4 + '</div>';
//创建检索信息窗口对象
var searchInfoWindow = null;
searchInfoWindow = new BMapLib.SearchInfoWindow(map, Content, {
title : Title, //标题
width : 500, //宽度
height : 105, //高度
enableSendToPhone : false, //是否使用发送手机
panel : "panel", //检索结果面板
enableAutoPan : true, //自动平移
searchTypes :[]
});
searchInfoWindow.open(Marker);
});
注：原文参考：https://blog.csdn.net/zjuwwj/article/details/53374947#commentsedit