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這些代碼中的一部分是借來的,所以我有點麻煩,因爲不熟悉將圖像轉換爲地圖中的可拖動和可編碼對象的過程。找到這個谷歌地圖JavaScript代碼中的致命缺陷?
這是phonegap webapp的一部分。運行時,我看到地圖,然後看到標記圖像,然後我可以拖動 - 但是,當我放下它時,它不會固定到地圖上,並且可以點擊進行事件觸發,就像我在原始示例中對其進行建模後。任何人都可以發現任何憤怒的瑕疵?
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no;" />
<meta charset="utf-8">
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map { height: 100% }
</style>
<!-- iPad/iPhone specific css below, add after your main css >
<link rel="stylesheet" media="only screen and (max-device-width: 1024px)" href="ipad.css" type="text/css" />
<link rel="stylesheet" media="only screen and (max-device-width: 480px)" href="iphone.css" type="text/css" />
-->
<!-- If your application is targeting iOS BEFORE 4.0 you MUST put json2.js from http://www.JSON.org/json2.js into your www directory and include it here -->
<script type="text/javascript" charset="utf-8" src="phonegap-1.4.1.js"></script>
<script type="text/javascript">
function onBodyLoad()
{
document.addEventListener("deviceready", onDeviceReady, false);
}
/* When this function is called, PhoneGap has been initialized and is ready to roll */
/* If you are supporting your own protocol, the var invokeString will contain any arguments to the app launch.
see http://iosdevelopertips.com/cocoa/launching-your-own-application-via-a-custom-url-scheme.html
for more details -jm */
<script src="http://maps.google.com/maps?file=api&v=2&key=ABQIAAAAHvl0q_ICxMdoioV8TAVeDhT3Rnec_7H_Z7LsYhQbN1_UW7UedxRVF7XTuKiZUL-yUwkvJri9Ou5rRQ" type="text/javascript"></script>
<script>
<script>
function centerAndZoomOnBounds(bounds) {
var center = bounds.getCenter();
var newZoom = map.getBoundsZoomLevel(bounds);
if (map.getZoom() != newZoom) {
map.setCenter(center, newZoom);
} else {
map.panTo(center);
}
}
function createMarker(p) {
var m = new GMarker(p);
GEvent.addListener(m,"click",function(){this.openInfoWindow(p.toUrlValue())});
return m;
}
function addMarkerToMap() {
// find location of point
var markerPointx = this.left+10; // left+half the width;
var markerPointy = this.top+34 ; // top + height;
var markerPoint = map.fromContainerPixelToLatLng(new GPoint(markerPointx,markerPointy));
// add marker
var m1 = createMarker(markerPoint);
map.addOverlay(m1);
// move draggable back to start
marker.moveTo(new GPoint(16,110));
}
</script>
</head>
<body onload="initialize()" onunload="GUnload()">
<p><big><a href="InputCoordinates.html">Back</a></big></p>
<div id="map" width=100% height=100%>
<br><p style="padding-left:25px" id="message">You should be seeing a Google Map here.</p>
</div>
<img src="http://maps.gstatic.com/intl/en_ALL/mapfiles/marker.png" id="imgMarker">
<script type="text/javascript">
//<![CDATA[
var mapdiv = document.getElementById("map");
var map = new GMap2(mapdiv);
map.addControl(new GSmallMapControl());
map.addControl(new GScaleControl());
map.addControl(new GMapTypeControl());
map.setCenter(new GLatLng(52.019029,-0.770427), 6, G_NORMAL_MAP);
marker = new GDraggableObject(document.getElementById("imgMarker"));
marker.moveTo(new GPoint(16,110));
GEvent.addListener(marker,"dragend",addMarkerToMap);
//]]>
</script>
<!--Maps API Key
AIzaSyD52tRfTY1FtEgXQpvu9-jN5AOz-2pxQg0
-->
</body>
</html>
此外,開幕和
標籤不包括您發佈的文檔中,不知道這是一個複製過去的錯誤,或與原始源的問題。 – javram 2012-03-22 16:09:06是的,缺失標籤是複製/粘貼錯誤。然而,另一部分是故意的,但沒有被理解。在我自己寫的其他地圖頁面中,我確實有一個初始化函數,整個工作都很順利。然而,在我部分複製的這個人的例子中,沒有初始化,但仍然可以工作。你能解釋一下,如果它能以任何一種方式發揮作用,那麼它們有什麼不同? – Aerovistae 2012-03-22 17:52:07
我不得不看另一個例子的代碼能夠告訴你。它的一大部分是時機。只要存在DOM元素,而不是腳本可訪問的元素,如果這些元素還不是DOM的一部分,那麼嘗試通過腳本訪問它們將會失敗。這是爲什麼jQuery中的文檔reday函數變得如此流行的一個重要原因,它抽象了初始化過程的所有時序。 – javram 2012-03-22 18:51:19