lzugis——Arcgis Server for JavaScript API之自己定义InfoWindow

用过Arcgis Server for JavaScript API肯定知道InfoWIndow。你在用InfoWindow的时候会发现各种问题，比如不能全然显示的问题，遮盖对象的问题等等。所以呢我在实现这个功能的时候动了下脑子，想自己用div+css弄一个，倒腾了半天，弄出来了一个例如以下所看到的的：

做的比較丑陋，样式方面还得好好下下功夫。东西是差点儿相同实现了，以下说说思路：

首先。DIV定义，这个样式，我定义了5个div，各自是infowin，title，colse，content。arrow，当中。infowin是整个InfoWindow的大框架，title为标题。close为关闭button，content为主要内容，arrow为以下的小尾巴。我们能够将这个小尾巴做的长一点。以免对象被遮盖的情况，代码为：

    <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>

定义了div就得进行布局。定义样式了，样式为：

    <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>

样式定义完之后就得考虑事件了，一般InfoWindow是在点击某个对象时弹出来的，所以我们得定义对象图层的click事件：

		function leftClick(evt){
			infowin.style.display="none";

			var strtitle="城市名称"
		  	var strcontent = "****是一座漂亮的城市<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";

			infowin.style.left=(evt.clientX-width/2)+"px";
			infowin.style.top=(evt.clientY-height-50)+"px";
			infowin.style.position="absolute";
			infowin.style.width=width+"px";
			infowin.style.height=height+"px";
			infowin.style.display="block";

			title.innerHTML = strtitle;
			content.innerHTML = strcontent;

		}
		//鼠标单击
		featurelayercity.on("click", leftClick);

点击对象，在鼠标的点击位置出现。所以我们得将infowin的position样式设为absolute。并定义left和top分别为clientX和clientY，并将其display设置为block，将其显示，实现的具体代码例如以下：

<!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 infowin,colse,title,content;

	  var width=400,height=230;

	  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 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);	

		infowin = document.getElementById("infowin");
	 	colse = document.getElementById("close");
	  	title = document.getElementById("title");
	  	content = document.getElementById("content");
		function leftClick(evt){
			infowin.style.display="none";

			var strtitle="城市名称"
		  	var strcontent = "****是一座漂亮的城市<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";

			infowin.style.left=(evt.clientX-width/2)+"px";
			infowin.style.top=(evt.clientY-height-50)+"px";
			infowin.style.position="absolute";
			infowin.style.width=width+"px";
			infowin.style.height=height+"px";
			infowin.style.display="block";

			title.innerHTML = strtitle;
			content.innerHTML = strcontent;

		}
		//鼠标单击
		featurelayercity.on("click", leftClick);
      });
    </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>

眼下仅仅实现到了这儿， 还有下面问题待解决：1、地图拖动后infowin随着地图的联动。2、地图缩放后infowin随着地图的联动；3、内容不在可视范围时候的移动；4、样式。挺难看的。希望有人实现后共享下代码，造福全GISer。

lzugis