自定义事件

使用Map的emit和on方法,绑定和触发自定义事件。

源代码编辑器

 <!doctype html>
<html>
<head>
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="chrome=1">
 <meta name="viewport" content="initial-scale=1.0, user-scalable=no, width=device-width">
 <title>自定义事件</title>
 <link rel="stylesheet" href="https://a.amap.com/jsapi_demos/static/demo-center/css/demo-center.css"/>
 <style>
 html,body,#container{
 height:100%;
 width:100%;
 }
 </style>
</head>
<body>
<div id="container" tabindex="0"></div>
<div class="input-card" style="width:18rem">
 <h4>自定义事件的绑定与解绑</h4>
 <div>
 <div class="input-item">
 <button id="bt1" class="btn" style="margin-right:1rem;">绑定事件</button>
 <button id="bt2" class="btn">解绑事件</button>
 </div>
 </div>
</div>
<div class="info" id="tip">
 给地图绑定自定义的count事件,实现新增marker点的计数<br>
 <span id="count">总共添加了0个Marker.</span>
</div>
<script type="text/javascript" src="https://webapi.amap.com/maps?v=2.0&key=您申请的key值"></script>
<script type="text/javascript">
 var map = new AMap.Map('container', {
 zoom: 10,
 center: [116.39, 39.9]
 });
 var count = 0;
 var _onClick = function(e) {
 new AMap.Marker({
 position: e.lnglat,
 map: map
 })
 map.emit('count', {count: count += 1});//触发自定义事件
 }
 var countDiv = document.getElementById('count');
 var _onCount = function(e) {
 countDiv.innerHTML = "总共添加了" + e.count + "个Marker.";
 }
 map.on("count", _onCount); //绑定自定义事件
 var bind = function() {
 remove();//防止重复绑定
 map.on("click", _onClick);//绑定地图事件
 }
 var remove = function() {
 map.off('click', _onClick);//移除地图事件
 }
 //绑定Dom事件
 var button1 = document.getElementById('bt1');
 var listener1 = button1.addEventListener('click', bind);//给div绑定单击事件 
 var button2 = document.getElementById('bt2');
 var listener2 = button2.addEventListener('click', remove);
</script>
</body>
</html>
 
 

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