lzugis——Arcgis Server for JavaScript API之自定义InfoWindow（续）

时间：2021-02-18 19:03:14

同样的标题后面加了一个括弧，不是为了增减博文数量，而确实是上个功能的完善，标注为续，意思是继续上次的内容，来说说如何自定义InfoWindow。

在上一讲中，实现了InfoWindow的显示，但是并没有实现地图拖动地图InfoWindow随着联动，以及缩放地图InfoWindow随着联动的问题，在本文章中，就上述两个问题提供一个解决思路。

首先，说说拖动地图InfoWindow的联动。拖动地图时，地图并未做缩放，所以只是做一个位置的偏移，因此，定义一个公共变量，记录InfoWindow出来时候的屏幕位置，拖动鼠标时获取鼠标的相对变化，再讲InfoWindow做一相对应的偏移即可：

var beforePoint; //定义InfoWindow出现的上一位置
function leftClick(evt){
    infowin.style.display="none";
    var strtitle="城市名称"
    var strcontent = "****是一座美丽的城市<br><br>****是一座好看的城市<br><br>****是一座富饶的城市<br><br>****是一座漂亮的城市";
    title.innerHTML = strtitle;
    content.innerHTML = strcontent;
    var screenpoint = map.toScreen(evt.mapPoint);
    beforeMapPoint = evt.mapPoint;
    beforePoint=screenpoint;
    showinfowindow(screenpoint.x,screenpoint.y);
}
map.on("pan",function(pan){
	var movePoint=pan.delta;
	showinfowindow((beforePoint.x+movePoint.x),(beforePoint.y+movePoint.y))
})
map.on("pan-end",function(panend){
	var movedelta=panend.delta;
	beforePoint.x=beforePoint.x+movedelta.x;
	beforePoint.y=beforePoint.y+movedelta.y;
})

这样，拖动鼠标，infoWindow会随着鼠标的移动而移动。

接着，我们说说缩放时InfoWindow的联动。缩放时的联动的逻辑是记录InfoWindow首次出现的地图点的坐标，当缩放结束后将首次出现的地图点转换为屏幕坐标，再将其显示出来。

map.on("zoom-end",function(){
	var zoomPoint = map.toScreen(beforeMapPoint);
	showinfowindow(zoomPoint.x,zoomPoint.y);
	beforePoint=zoomPoint;
})

怎么样，很简单吧，下面一并将全的代码附上：

<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <!--The viewport meta tag is used to improve the presentation and behavior of the samples
      on iOS devices-->
    <meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
    <title>Feature Layer - display results as an InfoWindow onHover</title>

    <link rel="stylesheet" href="http://localhost/arcgis_js_api/library/3.8/3.8/js/dojo/dijit/themes/claro/claro.css">
	<link rel="stylesheet" href="http://localhost/arcgis_js_api/library/3.8/3.8/js/dojo/dijit/themes/tundra/tundra.css">
    <link rel="stylesheet" href="http://localhost/arcgis_js_api/library/3.8/3.8/js/esri/css/esri.css">
	<style>
      html, body, #mapDiv
	  {
        padding:0;
        margin:0;
        height:100%;
		font-size:10px;
		position: relative;
      }
	  #infowin
	  {
		  display:none;
		  z-index:10000;
	  }
	  #close
	  {
		  float:right;
		  padding-top:10px;
		  font-weight:bold;
		  font-size:12px;
		  color:#FFF;
		  border:#000 1px solid;
		  height:20px;
		  width:20px;
		  text-align:center;
	  }
	   #close:hover
	  {
		  cursor:pointer;
	  }
	  #title
	  {
		  background-color:#666;
		  padding:10px;
		  font-weight:bold;
		  font-size:12px;
	  }
	  #content
	  {
		  padding-left:10px;
		  padding-top:10px;
		  background-color:#999;
		  height:200px;
	  }
	  #arrow
	  {
		  background-image:url(arrow.png);
		  height:30px;
	  }
    </style>
    <script src="http://js.arcgis.com/3.9/"></script>
    <script>
	  var dmap,infowin,colse,title,content;
	  var width=400,height=230,offset=50;	  

	  var closeInfoWin = function (evt){
		  infowin=document.getElementById("infowin");
		  infowin.style.display="none";
	  }; 

	  require([
        "esri/map", //地图
		"esri/layers/ArcGISTiledMapServiceLayer",
		"esri/layers/FeatureLayer",//特征层
		"esri/symbols/PictureMarkerSymbol",//图片点符号
        "esri/renderers/SimpleRenderer", //简单渲染
		"esri/graphic", //图片
		"esri/lang",
		"dojo/domReady!"
      ], function(
        Map,ArcGISTiledMapServiceLayer,FeatureLayer,PictureMarkerSymbol,SimpleRenderer,esriLang
      ) {
		var beforePoint;
		var beforeMapPoint; 

        var map = new Map("mapDiv", {
		  logo:false,
          center: [106.6854, 35.8364],
          zoom: 4,
          slider: true
        });	

		var shpServiceURL="**************************************";
		var shpTitlelayer=new ArcGISTiledMapServiceLayer(shpServiceURL);
		map.addLayer(shpTitlelayer);

		//--------------------------------------------------------------------------------------------------------
		var featurelayercity = new FeatureLayer("**************************************************", {
          mode: FeatureLayer.MODE_SNAPSHOT,
          outFields: ["*"]
        });
	    var pmsRed = new PictureMarkerSymbol('../images/location_icon_blue.png', 20, 20).setOffset(0, 15);
		//简单渲染
		var sr=new SimpleRenderer(pmsRed);
		featurelayercity.setRenderer(sr);
        map.addLayer(featurelayercity);	

		dmap=document.getElementById("mapDiv");
		infowin = document.getElementById("infowin");
	 	colse = document.getElementById("close");
	  	title = document.getElementById("title");
	  	content = document.getElementById("content");

		function showinfowindow(x,y){
			infowin.style.left=(x-width/2)+"px";
			infowin.style.top=(y-height-offset)+"px";
			infowin.style.position="absolute";
			infowin.style.width=width+"px";
			infowin.style.height=height+"px";
			infowin.style.display="block";
		};

		function leftClick(evt){
			infowin.style.display="none";
			var strtitle="城市名称"
		  	var strcontent = "****是一座美丽的城市<br><br>****是一座好看的城市<br><br>****是一座富饶的城市<br><br>****是一座漂亮的城市";
			title.innerHTML = strtitle;
			content.innerHTML = strcontent;
			var screenpoint = map.toScreen(evt.mapPoint);
			beforeMapPoint = evt.mapPoint;
			beforePoint=screenpoint;
			showinfowindow(screenpoint.x,screenpoint.y);
		}
		//鼠标单击
		featurelayercity.on("click", leftClick);	

	    map.on("pan",function(pan){
		  var movePoint=pan.delta;
		  showinfowindow((beforePoint.x+movePoint.x),(beforePoint.y+movePoint.y))
	   })
	    map.on("pan-end",function(panend){
		  var movedelta=panend.delta;
		  beforePoint.x=beforePoint.x+movedelta.x;
		  beforePoint.y=beforePoint.y+movedelta.y;
	   })
	    map.on("zoom-end",function(){
		  var zoomPoint = map.toScreen(beforeMapPoint);
		  showinfowindow(zoomPoint.x,zoomPoint.y);
		  beforePoint=zoomPoint;
	   })
      });
    </script>
  </head>
  <body class="tundra">
    <div id="mapDiv">
    	<div id="infowin">
        	<div id="close" onClick="closeInfoWin()">X</div>
            <div id="title"></div>
            <div id="content"></div>
            <div id="arrow"></div>
        </div>
    </div>
  </body>
</html>

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