當加載FeatureLayer時爲每個Feature增加監聽
protected function fLayer_graphicAddHandler(event:GraphicEvent):void
{
// just so we can add tool tips
event.graphic.toolTip = event.graphic.attributes.Name + "\n";
event.graphic.toolTip += "Magnitude " + myOneDecimalFormatter.format(event.graphic.attributes.Magnitude) + " earthquake";
if (event.graphic.attributes.Num_Deaths)
{
event.graphic.toolTip += "\n(" + event.graphic.attributes.Num_Deaths + " people died)";
}
}
protected function fLayer_graphicAddHandler(event:GraphicEvent):void
{
// just so we can add tool tips
event.graphic.toolTip = event.graphic.attributes.Name + "\n";
event.graphic.toolTip += "Magnitude " + myOneDecimalFormatter.format(event.graphic.attributes.Magnitude) + " earthquake";
if (event.graphic.attributes.Num_Deaths)
{
event.graphic.toolTip += "\n(" + event.graphic.attributes.Num_Deaths + " people died)";
}
}
查詢時,增加篩選的事件
private function doSearch():void
{
// fLayer.layerDetails.displayField
fLayer.definitionExpression = "STATE_NAME like '" + qText.text + "'";
}
// the following four functions are 'just' error handling and showing/hiding the busy cursor
protected function fLayer_updateStartHandler(event:LayerEvent):void
{
this.cursorManager.setBusyCursor();
}
protected function fLayer_updateEndHandler(event:LayerEvent):void
{
if (event.fault)
{
trace("updateEnd: " + event.fault); // maybe a badly formatted query?
}
else if (event.updateSuccess == false)
{
trace(event.type + ": " + event.updateSuccess + " ... unexpected failure");
}
else // things seem OK
{
if (FeatureLayer(event.layer).numGraphics < 1)
{
Alert.show("Sorry, found no such features, please try something else");
}
}
this.cursorManager.removeBusyCursor();
}
protected function fLayer_faultHandler(event:FaultEvent):void
{
Alert.show(event.fault.faultString + "\n\n" + event.fault.faultDetail, "FeatureLayer Fault " + event.fault.faultCode);
}
protected function fLayer_loadErrorHandler(event:LayerEvent):void
{
Alert.show(event.fault.faultString + "\n\n" + event.fault.faultDetail, "FeatureLayer Load Error " + event.fault.faultCode);
}
爲Feature增加監聽
<esri:FeatureLayer id="fLayer"
definitionExpression="STATE_NAME='South Carolina'"
graphicAdd="fLayer_graphicAddHandler(event)"
mode="snapshot"
outFields="*"
symbol="{defaultsym}"
url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/3"/>
protected function fLayer_graphicAddHandler(event:GraphicEvent):void
{
event.graphic.addEventListener(MouseEvent.MOUSE_OVER, onMouseOverHandler);
event.graphic.addEventListener(MouseEvent.MOUSE_OUT, onMouseOutHandler);
}
private function onMouseOverHandler(event:MouseEvent):void
{
var gr:Graphic = Graphic(event.target);
gr.symbol = mouseOverSymbol;
myTextArea.textFlow = TextFlowUtil.importFromString("<span fontWeight='bold'>2000 Population: </span>" + gr.attributes.POP2000.toString() + "<br/>"
+ "<span fontWeight='bold'>2000 Population per Sq. Mi.: </span>" + gr.attributes.POP00_SQMI.toString() + "<br/>"
+ "<span fontWeight='bold'>2007 Population: </span>" + gr.attributes.POP2007 + "<br/>"
+ "<span fontWeight='bold'>2007 Population per Sq. Mi.: </span>" + gr.attributes.POP07_SQMI);
myMap.infoWindow.label = gr.attributes.NAME;
myMap.infoWindow.closeButtonVisible = false;
myMap.infoWindow.show(myMap.toMapFromStage(event.stageX, event.stageY));
}
private function onMouseOutHandler(event:MouseEvent):void
{
var gr:Graphic = Graphic(event.target);
gr.symbol = defaultsym;
myMap.infoWindow.hide();
}
FeatureLayer選擇要素使之高亮顯示
protected function button2_clickHandler(event:MouseEvent):void
{
var query:Query=new Query();
query.where="RainYN like '0'";
fLayer.selectFeatures(query,"new");
}
獲取所有feature
protected function button2_clickHandler(event:MouseEvent):void
{
var arr:ArrayCollection=fLayer.graphicProvider as ArrayCollection;
Alert.show(arr.length.toString());
}
feature 具有event.graphic.visible=false;屬性。
在權限控制的時候,帥選顯示要素
protected function button3_clickHandler(event:MouseEvent):void
{
fLayer.definitionExpression = "NOT (Name IN('徐圖港西閘站','田大港閘站'))" ;
}
FeatureLayer的update_end事件,當更新時,包括地圖放大、縮小、漫遊、重新過濾篩選feature。
featureLayer.addEventListener(LayerEvent.UPDATE_END,updateEndHandler);
function updateEndHandler(event:LayerEvent):void{
var arr:ArrayCollection=featureLayer.graphicProvider as ArrayCollection;
Alert.show(arr.length.toString());
}
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