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    <p>A google.maps.Marker object can listen to the following user events, for example:</p> <blockquote> <p><code>'click' 'dblclick' 'mouseup' 'mousedown' 'mouseover' 'mouseout'</code></p> </blockquote> <p><a href="http://code.google.com/apis/maps/documentation/javascript/events.html" rel="nofollow">http://code.google.com/apis/maps/documentation/javascript/events.html</a></p> <p>GoogleMap uses InfoWindows to overlay the description of data over Marker. </p> <blockquote> <p>InfoWindows displays content in a floating window above the map. The info window looks a little like a comic-book word balloon; it has a content area and a tapered stem, where the tip of the stem is at a specified location on the map. You can see the info window in action by clicking business markers on Google Maps. The InfoWindow constructor takes an InfoWindow options object, which specifies a set of initial parameters for display of the info window. Upon creation, an info window is not added to the map. To make the info window visible, you need to call the open() method on the InfoWindow, passing it the Map on which to open, and optionally, the Marker with which to anchor it. (If no marker is provided, the info window will open at its position property.)</p> </blockquote> <p><a href="http://code.google.com/apis/maps/documentation/javascript/overlays.html#InfoWindows" rel="nofollow">http://code.google.com/apis/maps/documentation/javascript/overlays.html#InfoWindows</a></p> <blockquote> <p>Create a Marker and attach the infowindow with a mouseover event</p> </blockquote> <pre><code>var myLatlng = new google.maps.LatLng(-25.363882,131.044922); var myOptions = { zoom: 4, center: myLatlng, mapTypeId: google.maps.MapTypeId.ROADMAP } var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions); var contentString = '&lt;div id="content"&gt;'+ '&lt;div id="siteNotice"&gt;'+ '&lt;/div&gt;'+ '&lt;h1 id="firstHeading" class="firstHeading"&gt;Uluru&lt;/h1&gt;'+ '&lt;div id="bodyContent"&gt;'+ '&lt;p&gt;&lt;b&gt;Uluru&lt;/b&gt;, Test '&lt;/div&gt;'+ '&lt;/div&gt;'; var infowindow = new google.maps.InfoWindow({ content: contentString }); var marker = new google.maps.Marker({ position: myLatlng, map: map, title:"Uluru (Ayers Rock)" }); google.maps.event.addListener(marker, 'mouseover', function() { infowindow.open(map,marker); }); </code></pre> <p><strong>EDITED</strong> after looking at your comment </p> <p>Google Maps uses JavaScript extensively. As the user drags the map, the grid squares are downloaded from the server and inserted into the page. When a user searches for a business, the results are downloaded in the background for insertion into the side panel and map; the page is not reloaded. Locations are drawn dynamically by positioning a red pin (composed of several partially-transparent PNGs) on top of the map images.</p> <p>A hidden IFrame with form submission is used because it preserves browser history. The site also uses JSON for data transfer rather than XML, for performance reasons. These techniques both fall under the broad Ajax umbrella. [From Wikipedia]</p>
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    1. POthe interactive inside the map tiles of google map
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    1. COThanks,but how the information window open is not the point. I care how they trigger the mousemove event,the event (show the inforwindow) is triggered only if your mouse enter a specified area,but this area is not regular.
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