我的代码有什么问题(使用dojo xhrGet Ajax)

时间:2011-09-26 23:42:57

标签: php ajax dojo

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,然后将它们编辑到文本框中。

Javascript代码结束:

当用户更改下拉列表中的选项时,应用程序应调用PHP脚本从数据库中获取新值,从JSON对象中检索它们,并修改文本区域以显示新值。

<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:

应该从JS应用程序获取名称,即“总线名称”,并使用该名称查找总线ID。然后它应该使用该ID访问公交车站(这一切都有效,我只是让JSON / AJAX位错误)

<?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);

?>

我在运行时也遇到dojo.xd.js:14的错误。

1 个答案:

答案 0 :(得分:0)

而不是传递给json_encode()的单个变量,您应该创建一个对象,然后将其编码为JSON,然后简单地使用正确的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();

在编码JSON之前,您的对象现在看起来像(使用我的示例数据):

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

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

当您在接收端设置javascript时,我相信它应该无需修改即可运行。要确定javascript结尾的JSON结构,请务必检查console.dir(result)函数中的load()