9、find查询结果可点击定位

眉间皱痕 提交于 2020-01-20 04:43:21

find查询与grid

1、 目的:完成查询,输出查询结果并在地图上高亮显示符合条件的图元,单击输出信息后定位到该Graphics,单击可显示详细信息。

2、 准备:

数据:本机服务数据http://localhost/ArcGIS/rest/services/China/MapServer

其中“0”层是中国的政区图

3、 开发步骤:

(1) 设计页面以及代码:

页面中心为地图<div>,地图的上面为查询按钮和条件文本框以及查询结果显示层!具体页面设计代码为:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="find_grid.aspx.cs" Inherits="find" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<link rel="stylesheet" type="text/css" href="http://serverapi.arcgisonline.com/jsapi/arcgis/1.2/js/dojo/dijit/themes/tundra/tundra.css">

<script type="text/javascript" src="http://serverapi.arcgisonline.com/jsapi/arcgis/?v=1.2"></script>

<script type="text/javascript" src="find.js"></script>

<title>查询并与ESRI的Grid绑定</title>

<style type="text/css">

#Text1

{

width: 234px;

}

.style1

{

width: 100%;

}

</style>

</head>

<body class="tundra">

<form id="form1" runat="server">

<div id="map" style="border: thick dotted #FF0000; height:570px; width:990px; top: 0px; right: 0px;position:absolute;"></div>

<div style="height:300px; width:222px; top:240px; right: 10px; z-index:200; position:absolute;">

<table class="style1">

<tr>

<td>

<input id="searth_text" type="text" />

<input id="Button1" type="button" value="查询" onclick="startquery();"/>

</td>

</tr>

<tr>

<td>

<div id="result_query" style="border: thin double #0000FF; height:300px;overflow:auto; visibility: hidden;">

<table id="mygrid" border="1" style="width: 90%"></table>

</div>

</td>

</tr>

</table>

</div>

</form>

</body>

</html>

(2) Find.js编写:

程序为查询数据中固定字段“PROV”,查询条件为PROV的值,即查询条件为PROV=“输入的数值”,因程序中注释很明确,故再次不再冗术,完整代码为:

dojo.require("esri.map");//注册引用map控件

dojo.require("esri.tasks.find");

var findTask, findParams;

var map,symbol;

var grid, store;

function init()

{

map = new esri.Map("map",{slider:true});//实例化map控件

var dynamicMapServiceLayer = new esri.layers.ArcGISDynamicMapServiceLayer("http://localhost/ArcGIS/rest/services/China/MapServer");

map.addLayer(dynamicMapServiceLayer);//加载图层

//定义查询

findTask = new esri.tasks.FindTask("http://localhost/ArcGIS/rest/services/China/MapServer");

//定义查询参数

findParams = new esri.tasks.FindParameters();

findParams.returnGeometry = true;

findParams.layerIds = [0];

findParams.searchFields = ["PROV"];

}

dojo.addOnLoad(init);//加载是调用init初始化地图

////按钮单击开始查询

function startquery() {

findParams.searchText = document.getElementById("searth_text").value;//获取查询条件

findTask.execute(findParams,showResults);

document.getElementById("result_query").style.visibility='visible';//显示结果层<div>

}

/////早地图上高亮显示查询结果

function showResults(results)

{

map.graphics.clear();

symbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_NULL, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255,255,0]), 2), new dojo.Color([0,0,0,0]));

var items = []; //存储查询结果属性值的变量

for (var i=0, il=results.length; i<il; i++) {

items.push(results[i].feature.attributes); //向items中压入数据

var graphic = results[i].feature;//以下为高亮显示查询结果

graphic.setSymbol(symbol);

var infoTemplate = new esri.InfoTemplate();

infoTemplate.setTitle(graphic.attributes.FID);

graphic.setInfoTemplate(infoTemplate);

map.graphics.add(graphic);

}

var mygrid=document.getElementById("mygrid");

//以下为给向表格mygrid中添加查询结果

for(i=0;i<items.length;i++)

{

var myrow=mygrid.insertRow();//添加行

myrow.onmouseover=function(){onRowOverHandler(this);};///动态定义行事件

myrow.onmouseout=function(){onRowOutHandler(this);};

myrow.onclick=function(){onRowClickHandler(this);};

var mycell=myrow.insertCell();//添加单元格

mycell.innerHTML=items[i].PROV;//写入值

var mycell=myrow.insertCell();

mycell.innerHTML=items[i].AREA;

var mycell=myrow.insertCell();

mycell.innerHTML=items[i].FID;

}

}

//自定义grid的单击行的事件(完成定位)

var selectedTaxLot;//要定位的Graphic

function onRowClickHandler(myrow)

{

var myid=myrow.cells[2].lastChild.nodeValue;//获取表格行的第三列的数据

if(selectedTaxLot!=null)//判断是否有要定位Graphic

{selectedTaxLot.setSymbol(symbol);}//如果有将其symbol设为统一风格

for (var i=0, il=map.graphics.graphics.length; i<il; i++) {//获取定位的Graphic

var currentGraphic = map.graphics.graphics[i];

if ((currentGraphic.attributes) && currentGraphic.attributes.FID == myid){

selectedTaxLot = currentGraphic;

break;

}

}

var highlightSymbol = new esri.symbol.SimpleFillSymbol(esri.symbol.SimpleFillSymbol.STYLE_SOLID, new esri.symbol.SimpleLineSymbol(esri.symbol.SimpleLineSymbol.STYLE_SOLID, new dojo.Color([255,0,0]), 3), new dojo.Color([125,125,125,0.35]));

selectedTaxLot.setSymbol(highlightSymbol);//设置定位图元的symbol

var taxLotExtent = selectedTaxLot.geometry.getExtent();

map.setExtent(taxLotExtent);//定位到选定Graphic

}

//自定义grid鼠标移动到行上的事件

function onRowOverHandler(myrow)

{

myrow.style.backgroundColor="#ff0000";

myrow.style.cursor="pointer";

}

function onRowOutHandler(myrow)

{

myrow.style.backgroundColor="#ffffff";

myrow.style.cursor="defoult";

}

4、 总结:

程序完成了查询的一般方法,并且提供自动定位!

5、 效果图为:

clip_image002

clip_image004

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