2

您好,我在使用 proj4js 库时遇到问题。这是我的来源:

<html>
   <head>
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
      <script type="text/javascript" src="lib/proj4js-combined.js"></script>
   </head>

   <script type="text/javascript">
    function go()
    {
        var lon = document.getElementById("xOrg").value;
        var lat = document.getElementById("yOrg").value;
        var reprojected = reproject(Number(lon),Number(lat));

        document.getElementById("xNew").value = reprojected.x;
        document.getElementById("yNew").value = reprojected.y;
    }

    function reproject(lon,lat)
        {
            var sourceSys = new Proj4js.Proj('WGS84');
            var destSys = new Proj4js.Proj('EPSG:32187');

            var pointSource = new Proj4js.Point(lon,lat);
            var pointDest = Proj4js.transform(sourceSys, destSys, pointSource);

            return pointDest;
        }
   </script>

   <body>
    <div>
    <input id="xOrg" type="text" value="-73.56"/>
    <input id="yOrg" type="text" value="45.49"/>
    </div>
    <div>
    <input id="xNew" type="text" value=""/>
    <input id="yNew" type="text" value=""/>
    </div>
    <div>
        <input type="button" value="go" onclick="go()"/>
    </div>
   </body>
</html>

我不明白为什么只有当我单击按钮两次时重新投影才有效,当我第一次单击它时,会返回相同的值。它似乎仅在我单击按钮两次或更多次时才有效。这是这个在线页面: 点击

4

2 回答 2

3
var sourceSys = new Proj4js.Proj('WGS84'); 
var destSys = new Proj4js.Proj('EPSG:32187'); 

到这里:

...

<script type="text/javascript">  
    var sourceSys = new Proj4js.Proj('WGS84'); 
    var destSys = new Proj4js.Proj('EPSG:32187'); 

    function go()
{
...  

无论出于何种原因,它现在都有效......

于 2010-10-28T14:01:18.387 回答
0

我无法加载页面,但这是刷新问题吗?IE。你能明确地使 xNew 和 yNew 输入标签在设置它们的值后立即刷新吗?

于 2010-10-27T19:49:40.453 回答