1 resizedmap类和Navigation类小结
1.1 Map类
1.1.1 概述
esri.Map类是一种容器，其中可以放置layer（图层），Graphic（），infowindow（动态信息窗口）。
其在网页中可以加载到DIV中，其高度宽度位置等有DIV决定。
其方法事件load在第一个图层加载完成后激发，因此，onloadhandler事件经常用来初始化map的一些参数和加载图层。
1.1.2 引用方式
引用方式为：esri.Map(divID,options?)
divID为显示地图的层的ID；
options为地图相关参数设置，主要的参数设置有：
（1）bool displayGraphicsOnPan：设置地图浏览时是否显示图形，设置为false可以提高运行效率和效果；
使用方法：
var myMap = new esri.Map("mapDiv", { displayGraphicsOnPan:false });
（2）<Extent> extent：设置地图的显示范围；
使用方法：
var myMap = new esri.Map("mapDiv", { extent: ry.Extent(-124.71, 31.89, -113.97, 42.63) });
（3）<Object> layer：用来加载图层，初始化地图。格式为：{type, url}
（4）<LOD[]> lods：待研究
（5）<Boolean> nav：地图可以pan，默认为True
（6）<Boolean> showInfoWindowOnClick：当Graphic有InfoTemplate时，单击Graphics就会出现InfoWindow，默认为：true
（7）<Boolean> slider：控制放大缩小滑块的显示，默认为True
var myMap = new esri.Map("mapDiv", { slider:false, nav:false });
1.1.3 属性
Property
Type
Description
extent
Extent
The current extent of the map in map units. This property is read-only.
graphics
GraphicsLayer
Add and remove graphics from the GraphicsLayer.
height
Number
Current height of the map in screen pixels.
id
String
Reference to HTML DIV or other element where the map is placed on the page. This property is set in the Map constructor.
infoWindow
InfoWindow
Displays the InfoWindow on a map.
isClickRecenter
Boolean
When true, the key sequence of shift then click to recenter the map is enabled.
isDoubleClickZoom
Boolean
When true, double click zoom is enabled. This allows a user to zoom and recenter the map by double clicking the mouse.
isKeyboardNavigation
Boolean
When true, keyboard navigation is enabled. This allows users to pan the keyboard using the arrow keys and to zoom using the + and - keys.
isPan
Boolean
When true, map panning is enabled using the mouse.
isPanArrows
Boolean
When true, pan arrows are displayed around the edge of the map.
isRubberBandZoom
Boolean
When true, rubberband zoom is enabled. This allows users to draw a bounding box zoom area using the mouse.
isScrollWheelZoom
Boolean
When true, the mouse scroll wheel zoom is enabled.
isShiftDoubleClickZoom
Boolean
When true, shift double click zoom is enabled. This allows a user to zoom and recenter the map by shift + double clicking the mouse.
isZoomSlider
Boolean
When true, the zoom slider is displayed on the map.
layerIds
String[]
Array of current layers added to the map. There is always a default Graphics layer added to the map.
loaded
Boolean
After the first layer is loaded, the value is set to true.
position
Point
This point geometry in screen coordinates represent the top-left corner of the map container. This coordinate also acts as the origin for all screen coordinates returned by Map and GraphicsLayer events.
spatialReference
SpatialReference
The spatial reference of the map. See Projected Coordinate Systems and Geographic Coordinate Systems for the list of supported spatial references.
width
Number
Current width of the map in screen pixels.
 
1.1.4 方法
Method
Return Value
Description
addLayer(layer, index?)
none
Adds an ESRI Layer to the map.添加图层到地图中，index表示加入图层的位置。
getInfoWindowAnchor(screenCoords)
String
Sets an InfoWindow's anchor when calling InfoWindow.show.
获取InfoWindow的位置。
screenCoords为<point>类型
getLayer(id)
Layer
Returns an individual layer of a map.
获取位置为id的图层
getLevel()
Number
Gets the current level of detail ID for the map. Valid only with an ArcGISTiledMapService layer.
removeAllLayers()
none
Removes all layers from the map.
The map's extent, spatial reference, and tiling scheme if defined do not change when the layers are removed. When the next layer is added to the map, this layer is displayed at the same extent and spatial reference.
删除后，保留投影等信息。
removeLayer(layer)
none
Removes the specified layer from the map.删除指定的图层
reorderLayer(layerId, index)
none
Changes the layer order in the map.重新为图层排序，layerId为当前图层ID，index为要移动到的位置
reposition()
none
Repositions the map DIV on the page. This method should be used after the map DIV has been repositioned.
改变DIV的位置
resize()
none
Resizes the map DIV. This method should be used after the map DIV has been resized.改变DIV的大小
setExtent(extent, fit?)
none
Sets the extent of the map. The extent must be in the same spatial reference as the map.
设置显示范围，fit是布尔型的，当为true时要使tiled类型的图层在map上全部显示
setLevel(level)
none
Sets the map to the specified level ID. Zooms to the new level based on the current map center point. Valid only with an ArcGISTiledMapService layer.
toMap(screenPoint)
Point
Converts a single screen point or an array of screen points to map coordinates.
！！此方法很重要，用于将屏幕坐标转为地图坐标！
toScreen(mapPoint)
Point
Converts a single map point or an array of map points to screen coordinates.
与toMap相反，其将地图坐标转变为屏幕坐标
1.1.5 地图浏览导航Map navigation
Method
Return Value
Description
centerAndZoom(mapPoint, levelOrFactor)
none
Centers and zooms the map.
centerAt(mapPoint)
none
Recenters the map based on map coordinates as the center point.
disableClickRecenter()
none
Disallows clicking on a map to recenter it.
disableDoubleClickZoom()
none
Disallows double clicking on a map to zoom in a level and recenter the map.
disableMapNavigation()
none
Disallows all map navigation except the slider and pan arrows.
disablePan()
none
Disallows panning a map using the mouse.
disableRubberBandZoom()
none
Disallows zooming in or out on a map using a bounding box.
disableScrollWheelZoom()
none
Disallows zooming in or out on a map using the mouse scroll wheel.
disableShiftDoubleClickZoom()
none
Disallows shift double clicking on a map to zoom in a level and recenter the map.
disbleKeyboardNavigation()
none
Disallows panning and zooming using the keyboard.
enableClickRecenter()
none
Permits users to click on a map to recenter it.
enableDoubleClickZoom()
none
Permits users to double click on a map to zoom in a level and recenter the map.
enableKeyboardNavigation()
none
Permits users to pan and zoom using the keyboard.
enableMapNavigation()
none
Allows all map navigation.
enablePan()
none
Permits users to pan a map using the mouse.
enableRubberBandZoom()
none
Permits users to zoom in or out on a map using a bounding box.
enableScrollWheelZoom()
none
Permits users to zoom in or out on a map using the mouse scroll wheel.
enableShiftDoubleClickZoom()
none
Permits users to shift double click on a map to zoom in a level and recenter the map.
hidePanArrows()
none
Hides the pan arrows from the map.
hideZoomSlider()
none
Hides the zoom slider from the map.
panDown()
none
Pans the map south.
panLeft()
none
Pans the map west.
panLowerLeft()
none
Pans the map southwest.
panLowerRight()
none
Pans the map southeast.
panRight()
none
Pans the map east.
panUp()
none
Pans the map north.
panUpperLeft()
none
Pans the map northwest.
panUpperRight()
none
Pans the map northeast.
showPanArrows()
none
Shows the pan arrows on the map.
showZoomSlider()
none
Shows the zoom slider on the map.
1.1.6 事件列表以及功能 Events
Event
Description
onClick(event)
Fires when a user single clicks on the map using the mouse and the mouse pointer is within the map region of the HTML page.
onDblClick(event)
Fires when a user double clicks on the map using the mouse and the mouse pointer is within the map region of the HTML page.
onExtentChange(extent, delta, levelChange, lod)
Fires when the extent of the map has changed.
onKeyDown(keyEvent)
Fires when a keyboard key is pressed.
onKeyUp(keyEvent)
Fires when a keyboard key is released.
onLayerAdd(layer)
Fires any time a layer is added to the map.
onLayerRemove(layer)
Fires after the layer has been removed.
onLayerReorder(layer, index)
Fires when the map layer order has been changed.
onLayersRemoved()
Fires after all the layers have been removed.
onLayersReordered(layerIds)
Fires when all the layers have been reordered.
onLoad(map)
Fires when the first or base layer has been successfully added to the map.
onMouseDown(event)
Fires when a mouse button is pressed down and the mouse cursor is in the map region of the HTML page.
onMouseDrag(event)
Fires while the mouse is being dragged until the mouse button is released.
onMouseDragEnd(event)
Fires when a mouse button is released and the user stops dragging the mouse.
onMouseDragStart(event)
Fires when a mouse button is pressed down and the user starts to drag the mouse.
onMouseMove(event)
Fires any time the mouse pointer moves over the map region. A common use for this event is to show the current x,y coordinate of the map as the user moves the mouse pointer.
onMouseOut(event)
Fires when the mouse moves out of the map region of the HTML page.
onMouseOver(event)
Fires when the mouse moves into the map region of the HTML page.
onMouseUp(event)
Fires when the mouse button is released and the mouse pointer is within the map region of the HTML page.
onMouseWheel(event)
Fires when the mouse wheel is scrolled.
onPan(extent, delta)
Fires during the pan process.
onPanEnd(extent, endPoint)
Fires when the pan is complete.
onPanStart(extent, startPoint)
Fires when a user commences panning.
onReposition(x, y)
Fires when the map DIV is repositioned.
onResize(extent, height, width)
Fires when the Div containing the map has been resized.
onUnload(map)
Fires when the page is refreshed.
onZoom(extent,zoomFactor, anchor)
Fires during the zoom process.
onZoomEnd(extent, zoomFactor, anchor, level)
Fires when the zoom is complete.
onZoomStart(extent, zoomFactor, anchor, level)
Fires when a user commences zooming.
1.2 Navigation类

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