在Web应用中使用InfoTip(转载，翻译后)
1．在地图网页的<body>后面加入下面的代码:
<script>
if (!document.layers&&!document.all&&!document.getElementById)
event="test"
function showtip(current,e,text){
if (document.all||document.getElementById){
thetitle=text.split('<br>')
if (thetitle.length>1){
thetitles=''
for (i=0;i<thetitle.length;i++)
thetitles+=thetitle
current.title=thetitles
}
else
current.title=text
}
else if (document.layers){
document.tooltip.document.write('<layer bgColor="white" style="border:1px solid black;font-size:12px;">'+text+'</layer>')
document.tooltip.document.close()
document.tooltip.left=e.pageX+5
document.tooltip.top=e.pageY+5
document.tooltip.visibility="show"
}
}
function hidetip(){
if (document.layers)
document.tooltip.visibility="hidden"
}
</script>
2。在</body>前加入下面代码:
<script language="javascript">
var img = document.getElementById('MapControl1_Image');
img.useMap = "#WOTips";
</script>
3。进入visual studio 2003的IDE，在地图的aspx页上任何地方加入Literal Control。
鼠标右击Map Control选择属性，在Map Control的属性窗口选择事件页，双击PreRender 事件，此时PreRender事件注册信息会自动加入到InitializeComponent方法中，同时创建空的private void MapControl1_PreRender(object sender, System.EventArgs e)处理函数。在PreRender事件处理程序中加入如下代码：
//为不同视野下的地图图像创建热区
StringCollection areaTagCollection = this.getImageMapHotSpots();
string areaHTML = "";
System.Collections.Specialized.StringEnumerator sEnum = areaTagCollection.GetEnumerator();
while (sEnum.MoveNext())
{
areaHTML += ((string) sEnum.Current);
}
Literal1.Text = "<map id ='WOTips' name='WOTips'>" + areaHTML + "</map>";
4。把下面方法加入代码窗口:
private System.Collections.Specialized.StringCollection getImageMapHotSpots()
{
StringCollection areaTags = new StringCollection();
MapInfo.Mapping.Map rMap = MapControl1.Map;
MapInfo.Engine.ISession rMSession = MapInfo.Engine.Session.Current; //获得Session
MapInfo.Data.Catalog catalog = rMSession.Catalog;
MapInfo.Data.Table tabWorld = catalog.GetTable("Worldcap");
MapInfo.Data.MIDataReader dr = tabWorld.ExecuteReader();
while(dr.MoveNext())
{
MapInfo.Geometry.Point sPoint = (MapInfo.Geometry.Point)dr.Current.Geometry;
MapInfo.Geometry.Envelope env = sPoint.Envelope;
MapInfo.Geometry.DRect sRect = env.Bounds;
string tiptext = (string) dr.Current[1];
MapInfo.Geometry.DisplayTransform dt = rMap.DisplayTransform;
System.Drawing.Rectangle rect;
dt.ToDisplay(sRect, out rect);
string coords = (rect.Right-10) + "," + (rect.Top-20) + "," + (rect.Left + 10) + "," + (rect.Bottom + 10);
string tag = "<area shape ='rect' coords ='" + coords + "' οnmοuseοver='showtip(this,event,\"" + tiptext + "\")' onMouseout='hidetip()' />";
areaTags.Add(tag);
}
dr.Dispose();
return areaTags;
}
