jQuery.ajax()调用返回JSON.parse意外字符错误 [英] jQuery.ajax() call is returning JSON.parse unexpected character error

问题描述

我正在尝试调试以下jQuery.ajax()调用:

I am trying to debug the following jQuery.ajax() call:

var rollnum = $('#rollNum').val()
$.ajax({
url: sURL + "myController/myMethod",
type: "POST",
data: {rollnum: rollnum},
dataType: 'json', 
success: function(json){alert(json)},
error:function (xhr, ajaxOptions, thrownError){
       alert(xhr.status);
       alert(thrownError);}
});

这是方法:

function myMethod(){
$query = $this->db->query("SELECT tblontario.Address, tblontario.Municipality FROM tblontario WHERE RollNum = 211010002528200");
$json_address = array();
$json_municipality = array();
foreach ($query->result_array() as $row){
    $json_address[]     = $row['Address'];
    $json_municipality[] = $row['Municipality'];
}
$json['address'] = $json_address;
$json['municipality'] = $json_municipality;
echo json_encode($json);
exit;
    }

当前正在发生的事情是我收到了一个错误.错误包含以下详细信息:

Currently what is happening is that I am receiving an error back. The error consists of these details:

xhr.status: 200; and
thrownError: SyntaxError: JSON.parse: unexpected character

当我在firebug中查看XHR Response选项卡时，它显示:

When I look at the XHR Response tab in firebug it shows:

Reload the page to get source for: http://www.mysite.ca/myController/myMethod

由于xhr.status为200，因此某些事情似乎正常运行，但是我似乎无法从此调用中检索到json数据.谁能给我关于问题可能出在哪里的建议?谢谢.

Something seems to be working correctly since we are getting the xhr.status of 200, but I can't seem to retrieve the json data back from this call. Can anyone give me a suggestion for what the problem might be? Thanks.

推荐答案

将内容的标头设置为json类型... 这是设置标题类型的示例.

Set the header of the content to type of json... Here is an example of setting header type.

header('Cache-Control: no-cache, must-revalidate');
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
header('Content-type: application/json');

从jQuery 1.4开始，严格按照JSON数据进行解析.

In jQuery 1.4 onwards the JSON data is parsed in a strict manner.

任何格式错误的JSON都会被拒绝，并引发解析错误.

Any malformed JSON is rejected and a parse error is thrown.

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