douyingyu5573 2012-02-13 11:05
浏览 138
已采纳

php代码调用javascript函数返回函数未定义

The code bellow tries to ask the user to upload kml file and then saves the file at the same time it shows the kml data in google maps using google maps api v2. I could successfully take the kml file and saves it at a specific directory, HOWEVER, i am facing some problem in displaying the file on google maps immediately after the user clicks on KML TEST button. The error is Uncaught ReferenceError: showKML is not defined

Here is the code that I used

<!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=utf-8" />
  <title>Find latitude and longitude with Google Maps</title>   
    <script src="http://maps.google.com/maps?file=api&amp;v=2&amp;key=ABQIAAAAgrj58PbXr2YriiRDqbnL1RSqrCjdkglBijPNIIYrqkVvD1R4QxRl47Yh2D_0C1l5KXQJGrbkSDvXFA"
      type="text/javascript"></script>  

    <?php
    $upload = $_SERVER['PHP_SELF'];
    if(isset($_POST['kmltest'])) {
    $target_path = "uploads/";
    $fn =  basename( $_FILES['uploadedfile']['name']);

    $target_path = $target_path . basename( $_FILES['uploadedfile']['name']);
    //echo $target_path ;
    if(move_uploaded_file($_FILES['uploadedfile']['tmp_name'], $target_path)) {
    echo "The file ". basename( $_FILES['uploadedfile']['name']). " has been uploaded";
    echo "<script type=\"text/javascript\"> showKML(); </script>";


    } 
    else{
    echo "There was an error uploading the file, please try again!";
    }


}
?>

    <script src="egeoxml.js" type="text/javascript"></script>
    <script  type="text/javascript">

    var map;
    var options = {};
    var shapeCounter_ = 0;


        function initialize() {
        if (GBrowserIsCompatible()) {
            map = new GMap2(document.getElementById("map"));
            map.setCenter(new GLatLng(25.22903, 55.46612), 13);
            map.addControl(new GSmallMapControl());
            map.addControl(new GMapTypeControl());
            map.clearOverlays();
            document.getElementById("lat").value = "25.22903";
            document.getElementById("lng").value = "55.46612";
        }
    }




    function startShape() {
        initialize();
        document.getElementById('lat').disabled = true;
        document.getElementById('lng').disabled = true;
        var polygon = new GPolygon([],"ff0000", 2, 0.7,"ff0000",0.2);
        startDrawing(polygon, "Shape " + (++shapeCounter_), function() {
            var cell = this;
            var area = polygon.getArea();
            cell.innerHTML = (Math.round(area / 10000) / 100) + "km<sup>2</sup>";
            });
        showcoor(polygon);
    }

    function startDrawing(poly, name, onUpdate) {
        map.addOverlay(poly);
        poly.enableDrawing(options);
        poly.enableEditing({onEvent: "mouseover"});
        poly.disableEditing({onEvent: "mouseout"});
        GEvent.addListener(poly, "endline", function() {
            GEvent.addListener(poly, "click", function(latlng, index) {
                if (typeof index == "number") {
                    poly.deleteVertex(index);
                }    
            });
        });    
    }

    function showcoor (poly) {
        GEvent.addListener(poly, "endline", function() {
            GEvent.addListener(poly, "click", function() {
                var str= "" ;
                for (var i = 0, I = this.getVertexCount(); i < I; ++i) {
                    var xy = this.getVertex(i);
                    str += xy.lat() + ', ' + xy.lng() + '<br />';
                }
                alert (str);
            });
        });
    }

    function drawpoint() {
        //initialize();
        document.getElementById('lat').disabled = false;
        document.getElementById('lng').disabled = false;
        var lat = document.getElementById('lat').value;
        var lng = document.getElementById('lng').value;
        var center = new GLatLng(parseFloat(lat),   parseFloat (lng));
        map.setCenter(center, 7);
        geocoder = new GClientGeocoder();
        var marker = new GMarker(center, {draggable: true});  
        map.addOverlay(marker);
        GEvent.addListener(marker, "dragend", function() {
            var point = marker.getPoint();
            map.panTo(point);
            document.getElementById("lat").value = center.lat().toFixed(5);
            document.getElementById("lng").value = center.lat().toFixed(5);
        });
        GEvent.addListener(map, "moveend", function() {
            map.clearOverlays();
            var center = map.getCenter();
            var marker = new GMarker(center, {draggable: true});
            map.addOverlay(marker);
            document.getElementById("lat").value = center.lat().toFixed(5);
            document.getElementById("lng").value = center.lng().toFixed(5);
            GEvent.addListener(marker, "dragend", function() {
                var point =marker.getPoint();
                map.panTo(point);
                document.getElementById("lat").value = point.lat().toFixed(5);
                document.getElementById("lng").value = point.lng().toFixed(5);
            });
        });
    }

    function showKML() {
    //alert(filename);
        initialize();
        document.getElementById('lat').disabled = true;
        document.getElementById('lng').disabled = true;
        var exml;
        exml = new EGeoXml("exml", map, ("uploads/test.kml"));
        exml.parse();
        exml.show(); 
    }



    </script>


    </head> 
<body onload="initialize()" onunload="GUnload()" >
 <form action = <?php echo $upload; ?> method = "post"  enctype="multipart/form-data"/>
 <p align="left">

 <table>
  <tr>
    <td><b>Latitude</b></td>
    <td><b>Longitude</b></td>
  </tr>
  <tr>
    <td> 
    <input type="text" name="lat" id="lat" /></td>
    <td>
    <input type="text" name="lng" id="lng" /></td>
    <td>
    <input type="button" name="point" id="point" value="Point" onclick="drawpoint()" /><td>

    <input type="button" name="shape_b" id="shape_b" value="Poly" onclick="startShape()" /><td>



    <input type="submit" name="kmltest" id="kmltest" value="KML TEST" /> </td></tr>
    <tr>
    <td>
     <input type="file" name="uploadedfile" id="uploadedfile" />
    </td>
    </tr>



</table>
 </p>
  <p>
  <div align="center" id="map" style="width: 600px; height: 400px"><br/></div>
   </p>

  <script type="text/javascript">
//<![CDATA[
if (typeof _gstat != "undefined") _gstat.audience('','pagesperso-orange.fr');
//]]>
</script>

</form>

</body>

</html>

your assistance is highly appreciated

  • 写回答

2条回答 默认 最新

  • doucuyu2259 2012-02-13 11:13
    关注

    JavaScript <script> blocks are evaluated in blocks.

    Within the same block, a function can be called before it's defined, because function declarations are evaluated before the rest of the code.

    However, when you move function showKML(){} to a different block, the function is called before it's defined, hence the error.

    To solve the problem, you have to move the function declaration before the <?php .. ?> block, where showKML is called.

    A JSFiddle to demonstrate the problem: http://jsfiddle.net/SGbfu/1/


    More detailled explanation:
    1. When <script> and </script> is encountered, the code between is directly evaluated.
    2. All functions, declared using function x(){} are evaluated first. Then, the rest of the code is considered.
    3. Step 1-2 is repeated, till all <script> blocks in the document are evaluated.

    Example:

    <script>
    f(); // No error, f is declared below
    function f(){ alert('f() called'); }
    g(); // Error: g is not defined before, or within this block
    </script>
    <script>
    function g(){}
    </script>
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)

报告相同问题?

悬赏问题

  • ¥15 MATLAB动图问题
  • ¥15 【提问】基于Invest的水源涵养
  • ¥20 微信网友居然可以通过vx号找到我绑的手机号
  • ¥15 寻一个支付宝扫码远程授权登录的软件助手app
  • ¥15 解riccati方程组
  • ¥15 display:none;样式在嵌套结构中的已设置了display样式的元素上不起作用?
  • ¥15 使用rabbitMQ 消息队列作为url源进行多线程爬取时,总有几个url没有处理的问题。
  • ¥15 Ubuntu在安装序列比对软件STAR时出现报错如何解决
  • ¥50 树莓派安卓APK系统签名
  • ¥65 汇编语言除法溢出问题