使用 $.each 对 Json 数据进行 jquery 循环 [英] jquery loop on Json data using $.each

问题描述

我在名为 data 的变量中返回了以下 JSON.

这是返回的 JSON...

<预><代码>[{"Id": 10004, "PageName": "club"},{"Id": 10040, "PageName": "qaz"},{"Id": 10059, "PageName": "jjjjjjj"}]

我正在尝试使用 $.each 循环遍历集合，但我遇到了警报显示未定义的问题.我尝试了很多不同的语法，但似乎无法解决这个问题.

我使用的 JQuery 是

$.each(data, function(i, item) {警报(项目.页面名称)；});

有人能指出我正确的方向吗?

编辑这是我用来获取数据的代码

$.getJSON('/Cms/GetPages/123', null, function(data) {填充选择(数据)；});

这是回调时调用的函数

function fillSelect(data) {警报(数据)；$.each(data, function(i, item) {警报(项目.页面名称)；});}

编辑 2这让我有点困惑，根据文档，它应该像我一样工作，但事实并非如此.根据提琴手的说法，标题显示:-

Content-Type: application/json;字符集=utf-8

上面的 JSON 是完全正确的.如果这有什么不同，我正在使用 chrome.将在 IE 和 FF 中测试....

编辑 3

使用 $.get 产生

"[
 {
 "Id": 10041,
 "PageName": "01234567890",
 "MetaId": 1000,
 "TemplateId": 2
 },
 {
 "Id": 10001,
 "PageName": "about",
 "MetaId": 1000,
 "TemplateId": 1
 },
 {
 "Id": 10056,
 "PageName": "fdgdfgdfg",
 "MetaId": 1000,
 "TemplateId": 1
 },
 {
 "Id": 10052,
 "PageName": "hjkhjk",
 "MetaId": 1000,
 "TemplateId": 2
 },
 {
 "Id": 10059,
 "PageName": "jjjjjjj",
 "MetaId": 1000,
 "TemplateId": 1
 },
 {
 "Id": 10057,
 "PageName": "qqqqq",
 "MetaId": 1000,
 "TemplateId": 2
 },
 {
 "Id": 10054,
 "PageName": "qwqw",
 "MetaId": 1000,
 "TemplateId": 2
 }
]"

解决方案

var data = [{"Id": 10004, "PageName": "club"},{"Id": 10040, "PageName": "qaz"},{"Id": 10059, "PageName": "jjjjjjj"}];$.each(data, function(i, item) {警报(数据[i].PageName)；});$.each(data, function(i, item) {警报(项目.页面名称)；});

这两个选项效果很好，除非你有类似的东西:

var data.result = [{"Id": 10004, "PageName": "club"},{"Id": 10040, "PageName": "qaz"},{"Id": 10059, "PageName": "jjjjjjj"}];$.each(data.result, function(i, item) {警报(data.result[i].PageName)；});

试试这个并描述结果

$.get('/Cms/GetPages/123', function(data) {警报(数据)；});

对于编辑 3:

这解决了问题，但不是使用eval"的想法，您应该看到/Cms/GetPages/123"中的响应如何.

$.get('/Cms/GetPages/123', function(data) {$.each(eval(data.replace(/[
]/, "")), function(i, item) {警报(项目.页面名称)；});});

I have the following JSON returned in a variable called data.

THIS IS THE JSON THAT GETS RETURNED...

[ 
{"Id": 10004, "PageName": "club"}, 
{"Id": 10040, "PageName": "qaz"}, 
{"Id": 10059, "PageName": "jjjjjjj"}
]

and I am trying to loop through the collection using $.each but I am running into problems where the alert is showing undefined. I have tried a lot of different syntax but can't seem to figure this out.

The JQuery I am using is

$.each(data, function(i, item) {
    alert(item.PageName);
});

Can any one point me in the right direction?

EDIT This is the code I am using to grab the data

$.getJSON('/Cms/GetPages/123', null, function(data) {
  fillSelect(data);
});

and this is the function that gets called upon call back

function fillSelect(data) {
  alert(data);
  $.each(data, function(i, item) {
    alert(item.PageName);
  });
}

EDIT 2 This is slightly confusing me, according to the docs it should work as I have it, but it doesn't. According to fiddler the header shows:-

Content-Type: application/json; charset=utf-8

and the JSON is exactly correct above. I am using chrome if this makes any different. Will test in IE and FF....

EDIT 3

using $.get produces

"[
 {
 "Id": 10041,
 "PageName": "01234567890",
 "MetaId": 1000,
 "TemplateId": 2
 },
 {
 "Id": 10001,
 "PageName": "about",
 "MetaId": 1000,
 "TemplateId": 1
 },
 {
 "Id": 10056,
 "PageName": "fdgdfgdfg",
 "MetaId": 1000,
 "TemplateId": 1
 },
 {
 "Id": 10052,
 "PageName": "hjkhjk",
 "MetaId": 1000,
 "TemplateId": 2
 },
 {
 "Id": 10059,
 "PageName": "jjjjjjj",
 "MetaId": 1000,
 "TemplateId": 1
 },
 {
 "Id": 10057,
 "PageName": "qqqqq",
 "MetaId": 1000,
 "TemplateId": 2
 },
 {
 "Id": 10054,
 "PageName": "qwqw",
 "MetaId": 1000,
 "TemplateId": 2
 }
]"

解决方案

var data = [ 
 {"Id": 10004, "PageName": "club"}, 
 {"Id": 10040, "PageName": "qaz"}, 
 {"Id": 10059, "PageName": "jjjjjjj"}
];

$.each(data, function(i, item) {
    alert(data[i].PageName);
});

$.each(data, function(i, item) {
    alert(item.PageName);
});

these two options work well, unless you have something like:

var data.result = [ 
 {"Id": 10004, "PageName": "club"}, 
 {"Id": 10040, "PageName": "qaz"}, 
 {"Id": 10059, "PageName": "jjjjjjj"}
];

$.each(data.result, function(i, item) {
    alert(data.result[i].PageName);
});

EDIT:

try with this and describes what the result

$.get('/Cms/GetPages/123', function(data) {
  alert(data);
});

FOR EDIT 3:

this corrects the problem, but not the idea to use "eval", you should see how are the response in '/Cms/GetPages/123'.

$.get('/Cms/GetPages/123', function(data) {
  $.each(eval(data.replace(/[
]/, "")), function(i, item) {
   alert(item.PageName);
  });
});

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