jQuery从JSON数组获取数据
这是我从foursquare获得的JSON的一部分。
tips: { count: 2,
groups: [
{
type: "others",
name: "Tips from others",
count: 2,
items: [
{
id: "4e53cf1e7d8b8e9188e20f00",
createdAt: 1314115358,
text: "najjači fitness centar u gradu",
canonicalUrl: "https://foursquare.com/item/4e53cf1e7d8b8e9188e20f00",
likes: {
count: 2,
groups: [
{
type: "others",
count: 2,
items: []
}],
summary: "2 likes"
},
like: false,
logView: true,
todo: {
count: 0
},
user: {
id: "12855147",
firstName: "Damir",
lastName: "P.",
gender: "male",
photo: {
prefix: "https://irs1.4sqi.net/img/user/",
suffix: "/AYJWDN42LMGGD2QE.jpg"
}
}
},
{
id: "4e549e39152098912f227203",
createdAt: 1314168377,
text: "ajd da vidimo hocu li znati ponoviti",
canonicalUrl: "https://foursquare.com/item/4e549e39152098912f227203",
likes: {
count: 0,
groups: []
},
like: false,
logView: true,
todo: {
count: 0
},
user: {
id: "12855147",
firstName: "Damir",
lastName: "P.",
gender: "male",
photo: {
prefix: "https://irs1.4sqi.net/img/user/",
suffix: "/AYJWDN42LMGGD2QE.jpg"
}
}
}]
}]
}
我需要获取最后的提示 ,编写它的 以及他编写/发布它的 。
用户 :达米尔·P。
日期 :1314115358
文字 :健身中心
我尝试使用 ,这可以获取非数组值:
$.getJSON(url, function(data){ var text= data.response.venue.tips.groups.items.text;
alert(text);
});
但这不适用于数组。
:未捕获的TypeError:无法读取未定义的属性“文本”。
我也尝试了 ,但没有效果。
$.getJSON(url, function(data){ $.each(data.response.venue.tips.groups.items.text, function (index, value) {
console.log(value);
});
});
我究竟做错了什么 ?
回答:
您需要迭代组和项目。$
.each()将集合作为第一个参数,并data.response.venue.tips.groups.items.text
尝试 指向一个字符串。这两个groups
和items
是数组。
详细版本:
$.getJSON(url, function (data) { // Iterate the groups first.
$.each(data.response.venue.tips.groups, function (index, value) {
// Get the items
var items = this.items; // Here 'this' points to a 'group' in 'groups'
// Iterate through items.
$.each(items, function () {
console.log(this.text); // Here 'this' points to an 'item' in 'items'
});
});
});
或更简单地说:
$.getJSON(url, function (data) { $.each(data.response.venue.tips.groups, function (index, value) {
$.each(this.items, function () {
console.log(this.text);
});
});
});
在您指定的JSON中, 最后 一个是:
$.getJSON(url, function (data) { // Get the 'items' from the first group.
var items = data.response.venue.tips.groups[0].items;
// Find the last index and the last item.
var lastIndex = items.length - 1;
var lastItem = items[lastIndex];
console.log("User: " + lastItem.user.firstName + " " + lastItem.user.lastName);
console.log("Date: " + lastItem.createdAt);
console.log("Text: " + lastItem.text);
});
这将为您提供:
用户:Damir P.
日期:1314168377
文字:ajd da vidimo hocu li znati ponoviti
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