ArcGIS JS 学习笔记3 实现百度风格的BubblePopup

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1. 开篇

模仿是最好的学习，这次我们继续山寨百度，通过自定义Infowindow来实现百度风格的BubblePopup

2.准备

2.1 Copy模板

先打开百度地图，按下f12吧BubblePopup的HTML代码和CSS代码拷贝下来，这里我无耻的把类名改了，大家不要在意细节。

HTML模板

CSS代码

.dextra-bubble-pop {
position: absolute;
z-index: ;
box-sizing: border-box;
box-shadow: 1px 2px 1px rgba(0, 0, 0, .15);
background-color: #FFF;
} .dextra-poi-info-window {
padding: 4px 0;
} .dextra-poi-info-window .left {
padding-left: 10px;
padding-right: 10px;
height: 40px;
line-height: 40px;
display: table;
table-layout: fixed;
width: 140px;
text-align: center;
} .dextra-poi-info-window .name-wrap .name {
vertical-align: middle;
font-size: 14px;
font-weight: ;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
display: block;
} .dextra-bubble-pop-bottom span {
position: absolute;
left:72px;
width: 16px;
height: 10px;
background-image: url("../images/tail_shadow.png");
}

2.2 编写BubblePopup

要实现BubblePopup，实际上就是自定义一个InfoWindow，我们可以通过继承InfoWindowBase来实现。要实现自定义的InfoWindow。我们可以先参考一下官方的例子Custom info window，注意，这个例子是有缺陷的，如果当infowindow超出当前视图边界就会出现滚动条。下载官方的实例，我们打开infoWindow.js文件。

define([
"dojo/Evented",
"dojo/parser",
"dojo/on",
"dojo/_base/declare",
"dojo/dom-construct",
"dojo/_base/array",
"dojo/dom-style",
"dojo/_base/lang",
"dojo/dom-class",
"dojo/fx/Toggler",
"dojo/fx",
"dojo/Deferred",
"esri/domUtils",
"esri/InfoWindowBase" ],
function(
Evented,
parser,
on,
declare,
domConstruct,
array,
domStyle,
lang,
domClass,
Toggler,
coreFx,
Deferred,
domUtils,
InfoWindowBase
) {
return declare([InfoWindowBase, Evented], { isContentShowing :false, constructor: function(parameters) { lang.mixin(this, parameters); domClass.add(this.domNode, "myInfoWindow"); this._closeButton = domConstruct.create("div",{"class": "close", "title": "Close"}, this.domNode);
this._title = domConstruct.create("div",{"class": "title"}, this.domNode);
this._content = domConstruct.create("div",{"class": "content"}, this.domNode); this._toggleButton = domConstruct.create("div",{"class": "toggleOpen", "title": "Toggle"}, this.domNode); var toggler = new Toggler({
"node": this._content,
showFunc: coreFx.wipeIn,
hideFunc: coreFx.wipeOut
});
toggler.hide(); on(this._closeButton, "click", lang.hitch(this, function(){
//hide the content when the info window is toggled close.
this.hide();
if(this.isContentShowing){
toggler.hide();
this.isContentShowing = false;
domClass.remove(this._toggleButton);
domClass.add(this._toggleButton, "toggleOpen");
}
}));
on(this._toggleButton, "click", lang.hitch(this, function(){
//animate the content display
if(this.isContentShowing){ toggler.hide();
this.isContentShowing = false;
domClass.remove(this._toggleButton);
domClass.add(this._toggleButton,"toggleOpen"); }else{
toggler.show();
this.isContentShowing=true;
domClass.remove(this._toggleButton);
domClass.add(this._toggleButton,"toggleClose");
} }));
//hide initial display
domUtils.hide(this.domNode);
this.isShowing = false; },
setMap: function(map){
this.inherited(arguments);
map.on("pan-start", lang.hitch(this, function(){
this.hide();
}));
map.on("zoom-start", lang.hitch(this, function(){
this.hide();
}));
// map.on("zoom-start", //this, this.hide); },
setTitle: function(title){
this.place(title, this._title); },
setContent: function(content){
this.place(content, this._content);
},
show: function(location){
if(location.spatialReference){
location = this.map.toScreen(location);
} //Position 10x10 pixels away from the specified location
domStyle.set(this.domNode,{
"left": (location.x + 10) + "px",
"top": (location.y + 10) + "px"
}); //display the info window
domUtils.show(this.domNode);
this.isShowing = true;
this.onShow();
},
hide: function(){
domUtils.hide(this.domNode);
this.isShowing = false;
this.onHide(); },
resize: function(width, height){
domStyle.set(this._content,{
"width": width + "px",
"height": height + "px"
});
domStyle.set(this._title,{
"width": width + "px"
}); },
destroy: function(){
domConstruct.destroy(this.domNode);
this._closeButton = this._title = this._content = null; } }); });

我们就在此基础上进行改造，不但要实现需求还要解决缺陷。infoWindowBase是继承自_WidgetBase的，我们先来看一下infoWindowBase的官方描述.

我们可以重写infoWindowBase的一些方法，来实现自己的infoWindow。

首先我们先引入我们要用到的模块

对比官方的例子，我去掉了部分模块（coreFx,Toggler）,加入了dijit/_TemplateMixin，esri/geometry/webMecratorUtils，

esri/geomtry/srcreenUtils模块。_TemplateMixin是为了使用我在第一步拷贝下来的HTML模板，关于编写基于模板的widget可以到

dojo的官网进行查看；webMecratorUtils和srcreenUtils则是为了实现地理坐标和屏幕坐标的准确转换。

showMapPoint是一个全局的变量，用来记录popup的地理坐标位置。

templateString是_TemplateMixin模块的一个属性，用来保存HTML模板。

_events:是一个数组，用来存储相关的事件，在popup被释放时释放注册的事件。

先用一个私有方法来进行初始化。应为InfoWindowBase是继承自_WidgetBase的，domNode是_WidgetBase的一个属性，用于表示生成Widget的dom节点，可以通过在构造函数里用第二个参数来进行传入，或者在内部自己定义。

_createInfoWindowInstance: function (map) {
this.domNode = domConstruct.create("div", null, map.id + "_root");
domClass.add(this.domNode, "dextra-bubble-pop");
domStyle.set(this.domNode, {
width: "160px",
}); this.domNode.innerHTML = this.templateString; this._content = query("div.name-wrap span.name");
this._title=query("div.name-wrap");
//hide initial display
domUtils.hide(this.domNode);
this.isShowing = false;
},

注意，我在这里创建了一个div节点，并把它添加到一个id为{map.id}_root({map.id}占位符，用于表示地图的id)的dom节点中，这一步就是解决当infowindow超出当前视图范围时会出现滚动条。我们可以先用arcgis提供的infowindow来试一试，在浏览器中按

f12，我们看一看infowindow是放在哪的。

利用arcgis自带的infowindow，我们可以看到这个infowindow的dom节点被添加到一个id为map_root的div中。在这里，我的map控件的id为“map”，所以它会生成一个id为“map_root”({map.id}_root)的div。所以我们只要把自定生成的popup放到这个节点中，当popup超出当前视图时，会被裁减了，而不是出现滚动条。这里最关键的部分已经完成了，接下来的操作就是如何在地图上展现这个popup。

_showInfoWindow: function (extent) {
if (showMapPoint == null)return;
var showScreenPoint = screenUtils.toScreenGeometry(extent, this.map.width, this.map.height, showMapPoint);
domStyle.set(this.domNode, {
"left": (showScreenPoint.x - 80) + "px",
"top": (showScreenPoint.y - 76 ) + "px"
}); domUtils.show(this.domNode);
this.isShowing = true;
this.onShow();
}, show: function (location) {
showMapPoint = location;
if (webMercatorUtils.canProject(location, this.map)) {
showMapPoint = webMercatorUtils.project(location, this.map);
}
if (showMapPoint.spatialReference) {
var screenPoint = this.map.toScreen(showMapPoint);
domStyle.set(this.domNode, {
"left": (screenPoint.x - 80) + "px",
"top": (screenPoint.y - 76) + "px"
});
} //display the info window
domUtils.show(this.domNode);
this.isShowing = true;
this.onShow();
},

_showInfoWindow方法是一个私有方法，用于在地图事件触发时调用。当地图平移，缩放时根据地理坐标从新计算BubblePopup的屏幕坐标。用screenUtils.toScreenGeometry(extent, width, height, mapGeometry)根据地图的范围，宽度，高度，和点计算出相应的屏幕坐标。

show方法是一个公有方法，用于在外部进行调用。在这里利用了arcgis js 提供webMercatorUtils模块，来进行坐标的转换。一般而言，我们都会用经纬度坐标，但是当地图是webMercator投影时，就需要先把经纬度坐标转化成米制坐标，才能在正确的位置显示出来来。

关键的部分已经完成，下面贴出全部代码

define([
"dojo/Evented",
"dojo/on",
"dojo/query",
"dojo/_base/declare",
"dojo/dom-construct",
"dojo/dom-attr",
"dojo/_base/array",
"dojo/dom-style",
"dojo/_base/lang",
"dojo/dom-class",
"dijit/_TemplatedMixin",
"esri/domUtils",
"esri/InfoWindowBase",
"esri/geometry/ScreenPoint",
"esri/geometry/screenUtils",
"esri/geometry/webMercatorUtils",
"dojo/text!./templates/dextraPopup.html"
],
function (Evented,
on,
query,
declare,
domConstruct,
domAttr,
array,
domStyle,
lang,
domClass,
_TemplatedMixin,
domUtils,
InfoWindowBase, ScreenPoint, screenUtils, webMercatorUtils, template) {
var showMapPoint = null;
return declare([InfoWindowBase, Evented, _TemplatedMixin], { templateString: template,
_events: [],
constructor: function (parameters) {
lang.mixin(this, parameters);
},
_createInfoWindowInstance: function (map) {
this.domNode = domConstruct.create("div", null, map.id + "_root");
domClass.add(this.domNode, "dextra-bubble-pop");
domStyle.set(this.domNode, {
width: "160px",
}); this.domNode.innerHTML = this.templateString; this._content = query("div.name-wrap span.name");
this._title=query("div.name-wrap");
//hide initial display
domUtils.hide(this.domNode);
this.isShowing = false;
}, setMap: function (map) {
this.inherited(arguments);
this._events = [];
this._createInfoWindowInstance(map);
this._events.push(map.on("pan", lang.hitch(this, function (evt) {
if (this.isShowing) {
this._showInfoWindow(evt.extent);
}
}))); this._events.push(map.on("zoom-start", lang.hitch(this, function (evt) {
this.hide();
}))); this._events.push(map.on("zoom-end", lang.hitch(this, function (evt) {
this._showInfoWindow(evt.extent);
})));
}, unsetMap: function (map) {
this.inherited(arguments);
array.forEach(this._events, function (event) {
event.remove();
});
},
setTitle: function (title) {
this._title.forEach(function (node) {
domAttr.set(node, "title", title);
});
}, setContent: function (content) {
this._content.forEach(function (node) {
node.innerHTML = content;
});
}, _showInfoWindow: function (extent) {
if (showMapPoint == null)return;
var showScreenPoint = screenUtils.toScreenGeometry(extent, this.map.width, this.map.height, showMapPoint);
domStyle.set(this.domNode, {
"left": (showScreenPoint.x - 80) + "px",
"top": (showScreenPoint.y - 76 ) + "px"
}); domUtils.show(this.domNode);
this.isShowing = true;
this.onShow();
}, show: function (location) {
showMapPoint = location;
if (webMercatorUtils.canProject(location, this.map)) {
showMapPoint = webMercatorUtils.project(location, this.map);
}
if (showMapPoint.spatialReference) {
var screenPoint = this.map.toScreen(showMapPoint);
domStyle.set(this.domNode, {
"left": (screenPoint.x - 80) + "px",
"top": (screenPoint.y - 76) + "px"
});
} //display the info window
domUtils.show(this.domNode);
this.isShowing = true;
this.onShow();
},
hide: function () {
if (this.isShowing) {
domUtils.hide(this.domNode);
this.isShowing = false;
this.onHide();
}
},
resize: function (width, height) {
domStyle.set(this._content, {
"width": width + "px",
"height": height + "px"
});
},
remove: function () {
this.hide();
showMapPoint = null;
},
destroy: function () {
domConstruct.destroy(this.domNode);
}
});
});

DEMO：

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>DExtra-BubublPoopup</title>
<link rel="stylesheet" href="https://js.arcgis.com/3.16/esri/css/esri.css">
<link rel="stylesheet" href="../dist/dijit/css/dextraPopup.css">
<link rel="stylesheet" href="css/mainApp.css">
<script>
var dojoConfig = {
parseOnLoad:true,
packages: [{
name: 'custom',
location: location.pathname.replace(/\/[^/]+$/, '') + '/custom'//从cdn加载自己定义的模块方法
},
{
name: 'dextra',
location: '/extra.arcgis.3.x/dist/'//从cdn加载自己定义的模块方法
}]
};
</script>
<script src="https://js.arcgis.com/3.16/"></script>
<script>
require([
"dojo/dom",
"dojo/on",
"esri/map",
"esri/symbols/SimpleMarkerSymbol",
"esri/InfoTemplate",
"esri/layers/GraphicsLayer",
"dextra/layers/GoogleVectorLayer",
"dextra/dijit/DEBubblePopup",
"dojo/domReady!"],
function (dom, on,
Map, Graphic, SimpleMarkerSymbol, InfoTemplate, GraphicsLayer,
GoogleVectorLayer,DEBubblePopup) { var infoWindow = new DEBubblePopup();
var map = new Map("map", {
showAttribution: false,
center: [102.3, 24.6],
autoResize: true,
sliderPosition: "bottom-right",
logo: false,
infoWindow:infoWindow,
zoom:12
}); var googleVect = new GoogleVectorLayer();
map.addLayer(googleVect); var measureLayer = new GraphicsLayer({id: "infoWindowTest"});
map.addLayer(measureLayer);
on(dom.byId("infowindow"), "click", function (e) {
on.once(map, "click", function (evt) {
console.log(map._container);
var sms = new SimpleMarkerSymbol({
"color": [255, 0, 0],
"size": 12,
"xoffset": 0,
"yoffset": 0,
"type": "esriSMS",
"style": "esriSMSCircle",
"outline": {
"color": [0, 0, 0, 255],
"width": 1,
"type": "esriSLS",
"style": "esriSLSSolid"
}
}); var point = map.toMap(evt.screenPoint);
var attr = {"Xcoord": point.x, "Ycoord": point.y, "Plant": "Mesa Mint"};
var infoTemplate = new InfoTemplate("Locations", "Latitude: ${Ycoord} Longitude: ${Xcoord}Plant Name:${Plant}");
var graphic=new Graphic(point, sms,attr,infoTemplate);
measureLayer.add(graphic);
});
});
});
</script>
<style>
#measureTools {
position: absolute;
top: 50px;
left: 50px;
z-index: 1000;
}
</style>
</head>
<body>
<div id="measureTools">
<button id="infowindow">弹出框</button>
</div> <div id="map" ></div>
</body>
</html>