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A]問題摘要：解析JSON在JavaScript使用用於循環
我已經從蟒返回到JavaScript的JSON數據。我想穿過JSON結構並在html表格中打印數據元素。
B]代碼摘錄：從蟒被返回
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，這是一個城市，這樣有在JSON數據許多城市元素。
2]的Javascript代碼，我試圖在預先準備的HTML表格的「TBODY」解析通該數據結構和打印數據元素「#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);
}
}
問題我有所述JavaScript代碼是：
1]我無法找到在「數據」的城市元素的準確長度，因爲這些我不知道上限的for循環是什麼
2]我不知道我是否正在訪問「城市」VA for循環內正確rible。
[EDIT＃1]
基於由Salman和尖給出的響應，我不得不檢查這是返回JSON數據的Python代碼。經過一些調試後，發現JSON數據正在使用模板返回，因爲模板名稱在JSON數據中發生。我改變了發送JSON的機制，現在下面是返回的JSON數據的樣子
[{"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決此JSON結構循環。
[編輯＃2]
經過一番調試和響應由@Salman給下面的函數做這項工作
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);
}
}
的一個問題，我發現在調試時是JSON返回的是字符串格式，必須轉換爲JSON對象，這是使用jQuery完成的。
解析您發佈的代碼時，出現「未終止的字符串文字」錯誤。這是一個複製粘貼錯誤？ – 2011-04-19 12:09:56
這不是JSON。 http://jsonlint.com/（你可能希望data_for_users_city的值是一個數組，而不是一個字符串） – Quentin 2011-04-19 12:11:15
正如@David Dorward所說，你的「JSON」是無效的。首先，所有報價必須用雙引號，而不是單引號。其次，這不是那麼「無效」，只是錯誤，「data_for_users_city」的價值應該不是這樣完全引用的 - 它違背了使用JSON作爲編碼的全部目的。 – Pointy 2011-04-19 12:19:46