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百度地图API-给自定义覆盖物添加事件方法

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Release: 2016-06-13 11:26:08
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本文章简单的介绍了一下关于百度地图的应用,这里我介绍一个功能就是在自己定的层上给加个事件方法,有需要的参考一下。

给marker、lable、circle等Overlay添加事件很简单,直接addEventListener即可。那么,自定义覆盖物的事件应该如何添加呢?我们一起来看一看~

-----------------------------------------------------------------------------------------一、定义构造函数并继承Overlay
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// 定义自定义覆盖物的构造函数
function SquareOverlay(center, length, color){
this._center = center;
this._length = length;
this._color = color;
}
// 继承API的BMap.Overlay
SquareOverlay.prototype = new BMap.Overlay();二、初始化自定义覆盖物
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// 实现初始化方法  <br>SquareOverlay.prototype.initialize = function(map){  <br>// 保存map对象实例  <br> this._map = map;      <br> // 创建div元素,作为自定义覆盖物的容器  <br> var div = document.createElement("div");  <br> div.style.position = "absolute";      <br> // 可以根据参数设置元素外观  <br> div.style.width = this._length + "px";  <br> div.style.height = this._length + "px";  <br> div.style.background = this._color;    <br> // 将div添加到覆盖物容器中  <br> map.getPanes().markerPane.appendChild(div);    <br> // 保存div实例  <br> this._div = div;    <br> // 需要将div元素作为方法的返回值,当调用该覆盖物的show、  <br> // hide方法,或者对覆盖物进行移除时,API都将操作此元素。  <br> return div;  <br>}
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三、绘制覆盖物
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// 实现绘制方法  <br>SquareOverlay.prototype.draw = function(){  <br>// 根据地理坐标转换为像素坐标,并设置给容器 <br> var position = this._map.pointToOverlayPixel(this._center);<br> this._div.style.left = position.x - this._length / 2 + "px";  <br> this._div.style.top = position.y - this._length / 2 + "px";  <br>}
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四、添加覆盖物
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//添加自定义覆盖物  <br>var mySquare = new SquareOverlay(map.getCenter(), 100, "red");  <br>map.addOverlay(mySquare);
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五、给自定义覆盖物添加事件1、显示事件
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SquareOverlay.prototype.show = function(){  <br> if (this._div){  <br>   this._div.style.display = "";  <br> }  <br>}
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添加完以上显示覆盖物事件后,只需要下面这句话,就可以显示覆盖物了。
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 代码如下 复制代码
mySquare.show();
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2、隐藏覆盖物
// 实现隐藏方法  <br>
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 代码如下 复制代码
SquareOverlay.prototype.hide = function(){
if (this._div){
this._div.style.display = "none";
}
}
添加完以上code,只需使用这句话,即可隐藏覆盖物。
mySquare.hide();
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3、改变覆盖物颜色
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SquareOverlay.prototype.yellow = function(){  <br> if (this._div){  <br>    this._div.style.background = "yellow"; <br> }     <br>}
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上面这句话,是把覆盖物的背景颜色改成黄色,使用以下语句即可生效:
mySquare.yellow();
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“第五部分、给覆盖物添加事件”小结:我们在地图上添加了一个红色覆盖物,然后分别添加“显示、隐藏、改变颜色”的事件。示意图如下:那么,我们需要在html里,先写出map的容器,和3个按钮。
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 代码如下 复制代码
<div style="width:520px;height:340px;border:1px solid gray" id="container"></div><br><p><br>    <input type="button" value="移除覆盖物" onclick="mySquare.hide();"><br>    <input type="button" value="显示覆盖物" onclick="mySquare.show();"><br>    <input type="button" value="变成黄色" onclick="mySquare.yellow();"><br></p>
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然后,在javascript中,添加这三个函数:
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 代码如下 复制代码
// 实现显示方法  
SquareOverlay.prototype.show = function(){ <br> if (this._div){ <br> this._div.style.display = ""; <br> } <br>}
// 实现隐藏方法 <br>SquareOverlay.prototype.hide = function(){
if (this._div){
this._div.style.display = "none";
}
}

//改变颜色的方法
SquareOverlay.prototype.yellow = function(){ <br> if (this._div){ <br> this._div.style.background = "yellow"; <br> } <br>}
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六、如何给自定义覆盖物添加点击事件(这章重要!很多人问的)比如,我们给自定义覆盖物点击click事件。首先,需要添加一个addEventListener 的事件。如下:
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SquareOverlay.prototype.addEventListener = function(event,fun){<br>    this._div['on'+event] = fun;<br>}
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再写该函数里面的参数,比如click。这样就跟百度地图API里面的覆盖物事件一样了。
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mySquare.addEventListener('click',function(){<br>    alert('click');<br>});
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同理,添加完毕addEventListener之后,还可以添加其他鼠标事件,比如mouseover。
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mySquare.addEventListener('mousemover',function(){<br>    alert('鼠标移上来了');<br>});
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七、全部源代码自定义覆盖物
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 代码如下 复制代码
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5 自定义覆盖物的点击事件
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八、感谢大家支持!API常见问题总结贴:http://tieba.baidu.com/p/1147019448 
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