2011-09-26 58 views
2

我正在尝试使用此代码调用php文件,访问数据库,检索值并使用JSON对象返回它们,然后将它们编辑为文本框。我的代码有什么问题(使用dojo xhrGet Ajax)

代码为Javascript结束:

当用户改变下拉列表的选项,应用程序应该调用PHP脚本从数据库中获取新的价值,从一个JSON对象检索它们,并修改文本区域显示新的值。

<select id="busSelect" name="busSelect"> 
    <option>S053-HS - P</option> 
    <option>S059-HS - P</option> 
    <option>S064-HS - P</option> 
    <option>S069-HS - P</option> 
    <option>S070-HS - P</option> 
</select> 

    <textarea id="memo"></textarea> 




    <script src="http://ajax.googleapis.com/ajax/libs/dojo/1.6.1/dojo/dojo.xd.js" type="text/javascript"></script> 
    <script type ="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script> 

    <script type ="text/javascript"> 
     <?php 

     ?> 
     dojo.ready(function(){ 
      var myOptions = { 
       zoom: 12, 
       center: new google.maps.LatLng(26.4615832697227,-80.07325172424316), 
       mapTypeId: google.maps.MapTypeId.ROADMAP 
      }; 

      var map = new google.maps.Map(dojo.byId("map_canvas"), 
      myOptions); 

      dojo.connect(busSelect,"onchange",function(){ 

       dojo.xhrGet({ 

        url: "getRoute.php", 
        handleAs: "json", 
        timeout: 1000, 
        content: { 
        route: dojo.byId("busSelect").value 
        }, 

        load: function(result) { 

         var formResult = result.lat_json + " " + result.long_json + " " + result.name_json; 
         dojo.byId(memo).value = formResult; 

        } 

       }); 

      }); 

php脚本:

应该把它从JS应用程序,这是“总线名称”接收到的名字,并使用该名称查找总线ID。运行时,14:那么它应该访问总线使用ID(这所有的作品,我只是得到JSON/AJAX位错)

<?php 

header('Content-type: application/json'); 

    require_once 'database.php'; 

    mysql_connect($server, $user, $pw); 
    mysql_select_db("busapp") or die(mysql_error()); 

    $route = $_GET["route"]; 

    $result_id = mysql_query("SELECT * FROM routes WHERE name = $route"); 

    $result_row = mysql_fetch_array($result_id); 
    $route_id = $row['id']; 

    $result = mysql_query("SELECT * FROM stops_routes WHERE route_id = $route_id") 
    or die(mysql_error()); 




    $markers; 
    $stopid = array(); 
    $time = array(); 
    $lat; 
    $long; 
    $name; 
    $waypts = array(); 


    for ($x = 0; $row = mysql_fetch_array($result); $x++) { 
     $stopid[$x] = $row['stop_id']; 
     $time[$x] = $row['time']; 
    } 

    for ($x = 0; $x < sizeof($stopid); $x++) { 

     $result = mysql_query("SELECT * FROM stops WHERE id = $stopid[$x]") 
     or die(mysql_error()); 

     $row = mysql_fetch_array($result) 
     or die(mysql_error()); 

     $lat[$x] = $row['lat']; 
     $long[$x] = $row['long']; 
     $name[$x] = $row['name']; 

    } 

    $size = count($stopid); 

    $lat_json = json_encode($lat); 
    $long_json = json_encode($long); 
    $name_json = json_encode($name); 

?> 

我也越来越上dojo.xd.js错误停止。

回答

0

取代单个变量传递给json_encode(),您应该创建一个对象,然后将其编码为JSON,然后仅使用正确的Content-type标头回显JSON。

// Start with an associative array 
$arr = array("lat_json" => $lat, "long_json" => $long, "name_json" => $name); 
// Cast it to an Object of stdClass 
$obj = (object)$arr; 

// Encode it 
$json = json_encode($obj); 

// And return it to the calling AJAX by just echoing out the JSON 
header("Content-type: application/json"); 
echo $json; 
exit(); 

之前编码JSON,你的对象现在看起来像(我的示例数据):

stdClass Object 
(
    [lat_json] => 12345 
    [long_json] => 45678 
    [name_json] => the name 
) 

// After json_encode() 
{"lat":12345,"long":45678,"name":"the name"} 

正如您所设置的接收端的JavaScript,我相信它应该不加修改地运行。为了确定JavaScript端的JSON结构,请务必在您的load()函数中检查console.dir(result)