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A]问题摘要：解析JSON在JavaScript使用用于循环
我已经从蟒返回到JavaScript的JSON数据。我想穿过JSON结构并在html表格中打印数据元素。
B]代码摘录：从蟒被返回
1] JSON -
{'data_for_users_city':
'[
{"city":
{"city_name": "Boston",
"country": {"country_name": "United States"}
},
"status": true,
"date_time": {"ctime": "Thu Apr 7 09:38:00 2011", "hour": 9, "isoweekday": 4, "month": 4, "second": 0, "microsecond": 796000, "isocalendar": [2011, 14, 4], "timetuple": [2011, 4, 7, 9, 38, 0, 3, 97, -1], "year": 2011, "epoch": 1302169080.0, "isoformat": "2011-04-07T09:38:00.796000", "day": 7, "minute": 38}
},
]'
}
注意，这是一个城市，这样有在JSON数据许多城市元素。
2]的Javascript代码，我试图在预先准备的HTML表格的“TBODY”解析通该数据结构和打印数据元素“#datatable_for_current_users”
function LoadUsersDatatable(data) {
var tbody = $("#datatable_for_current_users > tbody").html("");
for (var i=0; i < data.length; i++)
{
var city = data.data_for_users_city[i];
var rowText = "<tr class='gradeA'><td>" + city.county.country_name + "</td><td>" + city.city_name + "</td><td>" + city.status + "</td><td>" + city.date_time.ctime + "</td></tr>";
$(rowText).appendTo(tbody);
}
}
问题我有所述JavaScript代码是：
1]我无法找到在“数据”的城市元素的准确长度，因为这些我不知道上限的for循环是什么
2]我不知道我是否正在访问“城市”VA for循环内正确rible。
[EDIT＃1]
基于由Salman和尖给出的响应，我不得不检查这是返回JSON数据的Python代码。经过一些调试后，发现JSON数据正在使用模板返回，因为模板名称在JSON数据中发生。我改变了发送JSON的机制，现在下面是返回的JSON数据的样子
[{"city": {"city_name": "Framingham", "country": {"country_name": "United States", "id": null}, "id": null}, "id": 1, "status": true, "date_time": {"ctime": "Thu Apr 7 09:38:00 2011", "hour": 9, "isoweekday": 4, "month": 4, "second": 0, "microsecond": 796000, "isocalendar": [2011, 14, 4], "timetuple": [2011, 4, 7, 9, 38, 0, 3, 97, -1], "year": 2011, "epoch": 1302169080.0, "isoformat": "2011-04-07T09:38:00.796000", "day": 7, "minute": 38}}, {"city": {"city_name": "Framingham", "country": {"country_name": "United States", "id": null}, "id": null}, "id": 2, "status": false, "date_time": {"ctime": "Thu Apr 7 09:38:03 2011", "hour": 9, "isoweekday": 4, "month": 4, "second": 3, "microsecond": 359000, "isocalendar": [2011, 14, 4], "timetuple": [2011, 4, 7, 9, 38, 3, 3, 97, -1], "year": 2011, "epoch": 1302169083.0, "isoformat": "2011-04-07T09:38:03.359000", "day": 7, "minute": 38}}, {"city": {"city_name": "Framingham", "country": {"country_name": "United States", "id": null}, "id": null}, "id": 3, "status": true, "date_time": {"ctime": "Thu Apr 7 09:38:08 2011", "hour": 9, "isoweekday": 4, "month": 4, "second": 8, "microsecond": 281000, "isocalendar": [2011, 14, 4], "timetuple": [2011, 4, 7, 9, 38, 8, 3, 97, -1], "year": 2011, "epoch": 1302169088.0, "isoformat": "2011-04-07T09:38:08.281000", "day": 7, "minute": 38}}, {"city": {"city_name": "Framingham", "country": {"country_name": "United States", "id": null}, "id": null}, "id": 4, "status": false, "date_time": {"ctime": "Thu Apr 7 09:38:14 2011", "hour": 9, "isoweekday": 4, "month": 4, "second": 14, "microsecond": 578000, "isocalendar": [2011, 14, 4], "timetuple": [2011, 4, 7, 9, 38, 14, 3, 97, -1], "year": 2011, "epoch": 1302169094.0, "isoformat": "2011-04-07T09:38:14.578000", "day": 7, "minute": 38}}, {"city": {"city_name": "Framingham", "country": {"country_name": "United States", "id": null}, "id": null}, "id": 13, "status": true, "date_time": {"ctime": "Wed Apr 13 01:37:58 2011", "hour": 1, "isoweekday": 3, "month": 4, "second": 58, "microsecond": 343000, "isocalendar": [2011, 15, 3], "timetuple": [2011, 4, 13, 1, 37, 58, 2, 103, -1], "year": 2011, "epoch": 1302658678.0, "isoformat": "2011-04-13T01:37:58.343000", "day": 13, "minute": 37}}, {"city": {"city_name": "Framingham", "country": {"country_name": "United States", "id": null}, "id": null}, "id": 14, "status": false, "date_time": {"ctime": "Wed Apr 13 01:38:01 2011", "hour": 1, "isoweekday": 3, "month": 4, "second": 1, "microsecond": 78000, "isocalendar": [2011, 15, 3], "timetuple": [2011, 4, 13, 1, 38, 1, 2, 103, -1], "year": 2011, "epoch": 1302658681.0, "isoformat": "2011-04-13T01:38:01.078000", "day": 13, "minute": 38}}, {"city": {"city_name": "Framingham", "country": {"country_name": "United States", "id": null}, "id": null}, "id": 23, "status": true, "date_time": {"ctime": "Sun Apr 17 21:24:18 2011", "hour": 21, "isoweekday": 7, "month": 4, "second": 18, "microsecond": 625000, "isocalendar": [2011, 15, 7], "timetuple": [2011, 4, 17, 21, 24, 18, 6, 107, -1], "year": 2011, "epoch": 1303075458.0, "isoformat": "2011-04-17T21:24:18.625000", "day": 17, "minute": 24}}]
我仍然在努力得到了解决此JSON结构循环。
[编辑＃2]
经过一番调试和响应由@Salman给下面的函数做这项工作
function LoadUsersDatatable(data) {
var tbody = $("#datatable_for_current_users > tbody").html("");
jsonData = jQuery.parseJSON(data);
for (var i = 0; i < jsonData.length; i++)
{
var citydata = jsonData[i];
var rowText = "<tr class='gradeA'><td>" + citydata.city.country.country_name + "</td><td>" + citydata.city.city_name + "</td><td>" + citydata.status + "</td><td>" + citydata.date_time.ctime + "</td></tr>";
$(rowText).appendTo(tbody);
}
}
的一个问题，我发现在调试时是JSON返回的是字符串格式，必须转换为JSON对象，这是使用jQuery完成的。
解析您发布的代码时，出现“未终止的字符串文字”错误。这是一个复制粘贴错误？ – 2011-04-19 12:09:56
这不是JSON。 http://jsonlint.com/（你可能希望data_for_users_city的值是一个数组，而不是一个字符串） – Quentin 2011-04-19 12:11:15
正如@David Dorward所说，你的“JSON”是无效的。首先，所有报价必须用双引号，而不是单引号。其次，这不是那么“无效”，只是错误，“data_for_users_city”的价值应该不是这样完全引用的 - 它违背了使用JSON作为编码的全部目的。 – Pointy 2011-04-19 12:19:46