地图缩放相关事件

绑定和解绑 Map 的 zoomstart、zoomend 等地图缩放相关事件。

源代码编辑器

 <!doctype html>
<html>
<head>
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
 <title>事件系统</title>
 <link rel="stylesheet" href="https://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css" />
 
 <style>
 html,
 body,
 #container {
 width: 100%;
 height: 100%;
 }
 </style>
</head>
<body>
<div id="container"></div>
<div class="info">
 <h4 id="text"></h4>
 <p>当前级别:<span id="map-zoom">15</span></p>
</div>
<div class="input-card" style="width:16rem">
 <h4>地图缩放相关事件</h4>
 <div>
 <div class="input-item">
 <button id="zoomOn" class="btn" style="margin-right:1rem;">绑定事件</button>
 <button id="zoomOff" class="btn">解绑事件</button>
 </div>
 </div>
</div>
<div id="tip"></div>
<script type="text/javascript" src="https://webapi.amap.com/maps?v=2.0&key=您申请的key值"></script>
<script src="https://a.amap.com/jsapi_demos/static/demo-center/js/demoutils.js"></script>
<script type="text/javascript">
 //初始化地图对象,加载地图
 var map = new AMap.Map("container", {
 zoom: 11
 });
 var logMapinfo = function (){
 var zoom = map.getZoom(); //获取当前地图级别
 document.querySelector("#map-zoom").innerText = zoom;
 };
 logMapinfo();
 function mapZoomstart(){
 document.querySelector("#text").innerText = '缩放开始';
 }
 function mapZoom(){
 logMapinfo();
 document.querySelector("#text").innerText = '正在缩放';
 }
 function mapZoomend(){
 document.querySelector("#text").innerText = '缩放结束';
 }
 
 // 事件绑定
 function zoomOn(){
 log.success("绑定事件!"); 
 map.on('zoomstart', mapZoomstart);
 map.on('zoomchange', mapZoom);
 map.on('zoomend', mapZoomend);
 }
 // 解绑事件
 function zoomOff(){
 log.success("解除事件绑定!"); 
 map.off('zoomstart', mapZoomstart);
 map.off('zoomchange', mapZoom);
 map.off('zoomend', mapZoomend);
 }
 
 // 给按钮绑定事件
 document.getElementById("zoomOn").onclick = zoomOn;
 document.getElementById("zoomOff").onclick = zoomOff;
</script>
</body>
</html>
 
 

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