openlayers上添加点击事件

有很多场景会有这个需求，就是我绘制了图标，点击图标需要展示一些对应的信息

openlayer的事件主要是通过监听来完成的，你所有的icon的点击事件都是可以通过监听map的点击事件来处理对应的逻辑的

话不多说直接上代码

// 监听singleclick事件,通过点击事件，获取对应点的feature图标
        const that: any = this;
        var overlay: any
        var popupCloser = document.getElementById("popup-closer") as HTMLElement;
        that.map.on('singleclick', function (e: any) {
            var container = document.getElementById("popup") as HTMLElement;
            var content = document.getElementById("popup-content") as HTMLElement;
            overlay = new olOverlay({
                //设置弹出框的容器
                element: container,
                //是否自动平移，即假如标记在屏幕边缘，弹出时自动平移地图使弹出框完全可见
                autoPan: true
            });
            console.log(e.coordinate)
            if (that.map.hasFeatureAtPixel(e.pixel)) {
                var feature = that.map.getFeaturesAtPixel(e.pixel)
                console.log(feature)
                var pixel = that.map.getEventPixel(e.originalEvent);
                that.map.forEachFeatureAtPixel(pixel, function (feature: any) {
                    //coodinate存放了点击时的坐标信息
                    var coodinate = e.coordinate;
                    //设置弹出框内容，可以HTML自定义
                    content.innerHTML = "<p>你点击的坐标为：" + coodinate + "</p>";
                    //设置overlay的显示位置
                    overlay.setPosition(coodinate);
                    //显示overlay
                    that.map.addOverlay(overlay);
                });
            }
        })

        popupCloser.addEventListener('click', function () {
            overlay.setPosition(undefined);
        });

你会发现里面很多dom的操作方式，没错，openlayer就是这么强大，就是你所有的渲染等都是对应的一个dom，就是div这种，不想pixijs等是通过canvas去绘制的

在此之前你还需要在你html里添加对应的dom元素，如下

<template>
  <div class="main">
    <div id="map" class="map">
      <div id="mouse-position"></div>
    </div>
    <div id="popup" class="ol-popup">
      <a href="#" id="popup-closer" class="ol-popup-closer"></a>
      <div id="popup-content"></div>
    </div>
  </div>
</template>

顺表丢上css样式，哈哈

.ol-popup {
    position: absolute;
    background-color: #eeeeee;
    -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;
    min-width: 280px;
}

.ol-popup:after,
.ol-popup:before {
    top: 100%;
    border: solid transparent;
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
}

.ol-popup:after {
    border-top-color: #eeeeee;
    border-width: 10px;
    left: 48px;
    margin-left: -10px;
}

.ol-popup:before {
    border-top-color: #cccccc;
    border-width: 11px;
    left: 48px;
    margin-left: -11px;
}

.ol-popup-closer {
    text-decoration: none;
    position: absolute;
    top: 2px;
    right: 8px;
}

.ol-popup-closer:after {
    content: "✖";
}

接下来看看效果

 索嘎，点击事件完工