Google Maps API version 3rd providesOverlayViewClass.OverlayViewIs a base class that provides several methods you must implement when creating a stack. This class also provides some methods for converting between screen coordinates and map locations.
To create a custom stack layer, perform the following operations:
prototypeSetgoogle.maps.OverlayView(). This effectively achieves "subclass" of stack layer classes ".onAdd()To attach the stack layer to the map. The system callsOverlayView.onAdd().draw()To process the visual display of objects. Similarly, after the object is displayed for the first time, the system will callOverlayView.draw().onRemove()To clear all elements added in the stack layer.
HTML code:
<! 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>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312"/>
<Title> overlayview </title>
<Link type = "text/CSS" rel = "stylesheet" href = "/style/mapmaker.css"/>
<SCRIPT type = "text/JavaScript" src = "</script'> http://maps.google.com/maps/api/js? Sensor = false & language = ZH-CN "> </SCRIPT>
<SCRIPT type = "text/JavaScript" src = "/JavaScript/overlayview. js"> </SCRIPT>
</Head>
<Body onload = "initialize ()">
<Div id = "show"> </div>
</Body>
</Html>
Overlayview. js
VaR overlay;
VaR geocoder;
Function initialize (){
Address = $ G ("Address ");
Name = $ G ("name ");
Geocoder = new Google. Maps. geocoder (); // instantiate Address Resolution
VaR mylatlng = new Google. Maps. latlng (30.658602, 104.064587); // initialize the coordinate center, which is listed in Chengdu.
VaR myoptions = {
Zoom: 15,
Center: mylatlng,
Maptypeid: Google. Maps. maptypeid. Roadmap // specify the map type
};
VaR map = new Google. Maps. Map (document. getelementbyid ("show"), myoptions );
Geocoder. geocode ({
'Address': Address
}, Function (results, status ){
If (status = Google. Maps. geocoderstatus. OK ){
Map. setcenter (results [0]. Geometry. Location); // locate the map center to the query result.
Overlay = new lablemarker (MAP, name, Results [0]. Geometry. Location); // instantiate the overlayview class
}
});
}
Function lablemarker (MAP, text, latlng ){
This. Map _ = map;
This. text _ = '<Div class = "iconthestyle"> <Div class = "S1"> </div> <Div class = "S2">' + TEXT + '</Div> <Div class = "S3"> </div> <Div class = "S4"> </div> <Div class = "S5"> </div> </Div> ';
This. latlng _ = latlng;
This. Div _ = NULL;
This. setmap (MAP );
}
// Inherit from Google. Maps. overlayview
Lablemarker. Prototype = new Google. Maps. overlayview ();
// Called when you are about to add the floating layer to the map
Lablemarker. Prototype. onadd = function (){
VaR DIV = Document. createelement ('div ');
Div. style. Border = 'none ';
Div. style. Position = 'absolute ';
Div. innerhtml = This. Text _;
This. Div _ = div;
VaR panes = This. getpanes ();
Panes. overlaylayer. appendchild (DIV );
};
// Called when the map is displayed for the first time
Lablemarker. Prototype. Draw = function (){
VaR overlayprojection = This. getprojection ();
VaR latlng = overlayprojection. fromlatlngtodivpixel (this. latlng _);
// Set the layer size and position
VaR DIV = This. Div _;
VaR size = new Google. Maps. Size (-26,-42); // modify the coordinate value;
Div. style. Left = (latlng. x + size. width) + 'px ';
Div. style. Top = (latlng. Y + size. Height) + 'px ';
};
// Setmap (null) of the floating layer is automatically called.
Lablemarker. Prototype. onremove = function (){
This. Div _. parentnode. removechild (this. Div _);
This. Div _ = NULL;
};
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