ArcGIS API For Javascript之动态图层

动态图层主要特点:

  • 改变地图服务的现有图层
  • 动态图层适用于海量图层的情况
  • 不需要将shp文件发布为服务,服务器可以直接读取shp文件在前端显示

调用动态图层

在前面已经说过动态图层并不是一种新的服务类型,而是地图服务的一种扩展,因此我们不需要发布服务,只需要对地图服务添加动态图层功能即可。启用地图服务的步骤为:

  • 给相应的地图服务启用动态工作空间
  • 选择服务器相应的硬盘地址并赋予其id
  • 将相应位置注册到ArcGIS Server服务器(保证ArcGIS Server可以访问数据)
  • 在Web端进行调用

启用动态图层

我们打开Manager->登录,找到该服务,点击功能,选择允许每次请求修改图层顺序和符号->添加
01.png
硬盘上的数据
02.png
注:D:\myshp文件夹下面有一个shp文件:lunkuoxian.shp
因此我们选择工作空间类型为:shpfile文件夹,工作空间id在此处取名为my,硬盘路径:D:\myshp
03.png
点击确定,重新启动服务
04.png
05.png
注册文件夹到服务器
点击站点->数据存储->注册文件夹(因为我们是文件夹,所以是注册文件夹,如果是数据库,那么就要注册数据库)
06.png
07.png
08.png
在Services Directory 查看动态图层是否启用
09.png

Web端调用

代码实现

首先我们加载地图

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
require(["esri/map",
"dojo/dom",
"dojo/on",
"esri/layers/ArcGISDynamicMapServiceLayer",
"esri/layers/FeatureLayer",
"esri/layers/TableDataSource",
"esri/layers/LayerDataSource",
"esri/renderers/SimpleRenderer",
"esri/symbols/SimpleMarkerSymbol",
"esri/symbols/SimpleLineSymbol",
"dojo/domReady!"], function (
Map,dom,on, ArcGISDynamicMapServiceLayer, FeatureLayer, TableDataSource, LayerDataSource, SimpleRenderer, SimpleMarkerSymbol,SimpleLineSymbol) {
var map = new Map("mapDiv");
var layer1 = new ArcGISDynamicMapServiceLayer("http://localhost:6080/arcgis/rest/services//Test/MyService/MapServer");
map.addLayer(layer1);
});

添加一个按钮(用于添加动态图层)

1
<button id="btn">添加动态图层</button>

给按钮添加事件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
on(dom.byId("btn"),"click",function(e){
//定义一个数据源
var dataSource = new TableDataSource();
//此处为我们设置的命名空间
dataSource.workspaceId = "my";
//命名空间下面的shp
dataSource.dataSourceName = "lunkuoxian.shp";
//定义一个图层数据源
var layerSource = new LayerDataSource();
//给图层数据源赋值
layerSource.dataSource = dataSource;
//定义一个要素图层:注意链接为动态图层的地址
var layer2 = new FeatureLayer("http://localhost:6080/arcgis/rest/services/Test/MyService/MapServer/dynamicLayer", {
mode: FeatureLayer.MODE_ONDEMAND,
outFields: ["*"],
source: layerSource
});
//定义线符号
var lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASH, new dojo.Color([255, 0, 0]), 3);
//定义渲染器
var renderer = new esri.renderer.SimpleRenderer(lineSymbol);
//定义渲染器
layer2.setRenderer(renderer);
layer2.refresh();
map.addLayer(layer2);
})

完整代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" type="text/css" href="http://localhost/arcgis_js_api/library/3.17/3.17/dijit/themes/tundra/tundra.css"/>
<link rel="stylesheet" type="text/css" href="http://localhost/arcgis_js_api/library/3.17/3.17/esri/css/esri.css" />
<script type="text/Javascript" src="http://localhost/arcgis_js_api/library/3.17/3.17/init.js"></script>
<script type="text/javascript">
require(["esri/map",
"dojo/dom",
"dojo/on",
"esri/layers/ArcGISDynamicMapServiceLayer",
"esri/layers/FeatureLayer",
"esri/layers/TableDataSource",
"esri/layers/LayerDataSource",
"esri/renderers/SimpleRenderer",
"esri/symbols/SimpleLineSymbol",
"dojo/domReady!"], function (
Map,dom,on, ArcGISDynamicMapServiceLayer, FeatureLayer, TableDataSource, LayerDataSource, SimpleRenderer,SimpleLineSymbol) {
var map = new Map("mapDiv");
var layer1 = new ArcGISDynamicMapServiceLayer("http://localhost:6080/arcgis/rest/services//Test/MyService/MapServer");
map.addLayer(layer1);

on(dom.byId("btn"),"click",function(e){
//定义一个数据源
var dataSource = new TableDataSource();
//此处为我们设置的命名空间
dataSource.workspaceId = "my";
//命名空间下面的shp
dataSource.dataSourceName = "lunkuoxian.shp";
//定义一个图层数据源
var layerSource = new LayerDataSource();
//给图层数据源赋值
layerSource.dataSource = dataSource;
//定义一个要素图层:注意链接为动态图层的地址
var layer2 = new FeatureLayer("http://localhost:6080/arcgis/rest/services/Test/MyService/MapServer/dynamicLayer", {
mode: FeatureLayer.MODE_ONDEMAND,
outFields: ["*"],
source: layerSource
});
//定义线符号
var lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASH, new dojo.Color([255, 0, 0]), 3);
//定义渲染器
var renderer = new esri.renderer.SimpleRenderer(lineSymbol);
//定义渲染器
layer2.setRenderer(renderer);
layer2.refresh();
map.addLayer(layer2);
})

});
</script>
</head>

<body>
<div id="mapDiv" style="height:600px;"></div>
<button id="btn">添加动态图层</button>
</body>
</html>

运行结果之后:
10.png

动态图层的属性查询

在真实需求中,我们不仅仅是将shp在地图中显示那么简单,我们往往要查询该图层的属性信息,我们在前面代码的基础上添加上属性查询。

方法1(通过click直接获取)

代码实现

给要素图层添加点击事件

1
2
3
4
5
6
7
8
9
10
11
12
layer2.on("click", function(evt) {
//得到点击的graphics
var graphic=evt.graphic;
//得到该属性信息
var attributes=graphic.attributes;
//得到该属性信息转换成字符串
var result=jsonUtil.stringify(attributes)
//将结果弹出一下
alert(result);
//获得要素图层的主键名称

})

全部代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" type="text/css" href="http://localhost/arcgis_js_api/library/3.17/3.17/dijit/themes/tundra/tundra.css"/>
<link rel="stylesheet" type="text/css" href="http://localhost/arcgis_js_api/library/3.17/3.17/esri/css/esri.css" />
<script type="text/Javascript" src="http://localhost/arcgis_js_api/library/3.17/3.17/init.js"></script>
<script type="text/javascript">
require(["esri/map",
"dojo/dom",
"dojo/on",
"esri/layers/ArcGISDynamicMapServiceLayer",
"esri/layers/FeatureLayer",
"esri/layers/TableDataSource",
"esri/layers/LayerDataSource",
"esri/renderers/SimpleRenderer",
"esri/symbols/SimpleLineSymbol","dojo/json",
"dojo/domReady!"], function (
Map,dom,on, ArcGISDynamicMapServiceLayer, FeatureLayer, TableDataSource, LayerDataSource, SimpleRenderer,SimpleLineSymbol,jsonUtil) {
var map = new Map("mapDiv");
var layer1 = new ArcGISDynamicMapServiceLayer("http://localhost:6080/arcgis/rest/services//Test/MyService/MapServer");
map.addLayer(layer1);

on(dom.byId("btn"),"click",function(e){
//定义一个数据源
var dataSource = new TableDataSource();
//此处为我们设置的命名空间
dataSource.workspaceId = "my";
//命名空间下面的shp
dataSource.dataSourceName = "lunkuoxian.shp";
//定义一个图层数据源
var layerSource = new LayerDataSource();
//给图层数据源赋值
layerSource.dataSource = dataSource;
//定义一个要素图层:注意链接为动态图层的地址
var layer2 = new FeatureLayer("http://localhost:6080/arcgis/rest/services/Test/MyService/MapServer/dynamicLayer", {
mode: FeatureLayer.MODE_ONDEMAND,
outFields: ["*"],
source: layerSource
});
//定义线符号
var lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASH, new dojo.Color([255, 0, 0]), 3);
//定义渲染器
var renderer = new esri.renderer.SimpleRenderer(lineSymbol);
//定义渲染器
layer2.setRenderer(renderer);
layer2.refresh();
map.addLayer(layer2);
layer2.on("click", function(evt) {
//得到点击的graphics
var graphic=evt.graphic;
//得到该属性信息
var attributes=graphic.attributes;
//得到该属性信息转换成字符串
var result=jsonUtil.stringify(attributes)
//将结果弹出一下
alert(result);
//获得要素图层的主键名称

})
})

});
</script>
</head>

<body>
<div id="mapDiv" style="height:600px;"></div>
<button id="btn">添加动态图层</button>
</body>
</html>

运行结果:
11.png

通过查询获得属性

代码实现

定义一个按钮(用户获得属性)

1
<button id="attr">用户弹出属性</button>

给相应的按钮绑定事件

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
on(dom.byId("attr"),"click",function(){
//得到要素图层的主键属性
var idProperty = layer2.objectIdField;
//定义查询参数
var query = new Query();
//是否返回几何形状
query.returnGeometry = false;
//图层的主键名称(根据自己要求修改)
query.objectIds = [247];
//查询条件1=1意思是:只根据主键查询,忽略where子句
query.where = "1=1";
//进行查询
layer2.selectFeatures(query, FeatureLayer.SELECTION_NEW,function(result){
//因为我们根据主键查询,一定只有一个元素
var graphic=result[0];
//获得属性
var attributes=graphic.attributes;
//得到该属性信息转换成字符串
var result=jsonUtil.stringify(attributes)
//将结果弹出一下
alert(result);
});

})

全部代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<link rel="stylesheet" type="text/css" href="http://localhost/arcgis_js_api/library/3.17/3.17/dijit/themes/tundra/tundra.css"/>
<link rel="stylesheet" type="text/css" href="http://localhost/arcgis_js_api/library/3.17/3.17/esri/css/esri.css" />
<script type="text/Javascript" src="http://localhost/arcgis_js_api/library/3.17/3.17/init.js"></script>
<script type="text/javascript">
require(["esri/map",
"dojo/dom",
"dojo/on",
"esri/layers/ArcGISDynamicMapServiceLayer",
"esri/layers/FeatureLayer",
"esri/layers/TableDataSource",
"esri/layers/LayerDataSource",
"esri/renderers/SimpleRenderer",
"esri/symbols/SimpleLineSymbol","dojo/json","esri/tasks/query",
"dojo/domReady!"], function (
Map,dom,on, ArcGISDynamicMapServiceLayer, FeatureLayer, TableDataSource, LayerDataSource, SimpleRenderer,SimpleLineSymbol,jsonUtil,Query) {
var map = new Map("mapDiv");
var layer1 = new ArcGISDynamicMapServiceLayer("http://localhost:6080/arcgis/rest/services//Test/MyService/MapServer");
map.addLayer(layer1);

on(dom.byId("btn"),"click",function(e){
//定义一个数据源
var dataSource = new TableDataSource();
//此处为我们设置的命名空间
dataSource.workspaceId = "my";
//命名空间下面的shp
dataSource.dataSourceName = "lunkuoxian.shp";
//定义一个图层数据源
var layerSource = new LayerDataSource();
//给图层数据源赋值
layerSource.dataSource = dataSource;
//定义一个要素图层:注意链接为动态图层的地址
var layer2 = new FeatureLayer("http://localhost:6080/arcgis/rest/services/Test/MyService/MapServer/dynamicLayer", {
mode: FeatureLayer.MODE_ONDEMAND,
outFields: ["*"],
source: layerSource
});
//定义线符号
var lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.STYLE_DASH, new dojo.Color([255, 0, 0]), 3);
//定义渲染器
var renderer = new esri.renderer.SimpleRenderer(lineSymbol);
//定义渲染器
layer2.setRenderer(renderer);
layer2.refresh();
map.addLayer(layer2);
on(dom.byId("attr"),"click",function(){
//得到要素图层的主键属性
var idProperty = layer2.objectIdField;
//定义查询参数
var query = new Query();
//是否返回几何形状
query.returnGeometry = false;
//图层的主键名称(根据自己要求修改)
query.objectIds = [247];
//查询条件1=1意思是:只根据主键查询,忽略where子句
query.where = "1=1";
//进行查询
layer2.selectFeatures(query, FeatureLayer.SELECTION_NEW,function(result){
//因为我们根据主键查询,一定只有一个元素
var graphic=result[0];
//获得属性
var attributes=graphic.attributes;
//得到该属性信息转换成字符串
var result=jsonUtil.stringify(attributes)
//将结果弹出一下
alert(result);
});

})

})

});
</script>
</head>

<body>
<div id="mapDiv" style="height:600px;"></div>
<button id="btn">添加动态图层</button>
<button id="attr">用户弹出属性</button>
</body>
</html>

补充

启用文件地理数据库三点不同

文件的目录
12.png
命名空间配置
13.png
注册文件夹配置
14.png
代码调用差别
15.png
注意:忽略了要素集的存在,即调用是lunkuoxian,而不是vector.lunkuoxian,调用的时候后面没有*.shp