JQuery从JSON数组中获取数据 [英] JQuery get data from JSON array

问题描述

这是我从foursquare获得的JSON的一部分。

This is part of the JSON i get from foursquare.

JSON

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"
                }
            }
        }]
    }]
}

我需要得到最后一个提示文字，编写它的用户以及撰写/发布时的日期。

I need to get the last tip text , the user who wrote it and the date when he wrote/post it.

用户：Damir P。

日期 ：1314115358

Date : 1314115358

文字：najjač健身中心你毕业

Text: najjači fitness centar u gradu

我试过 JQuery ，这可以获取非数组值：

I tried with JQuery and this works to fetch a non-array value:

$.getJSON(url, function(data){
    var text= data.response.venue.tips.groups.items.text;
    alert(text);
});

但它不适用于数组。

结果：未捕获的TypeError：无法读取未定义的属性text。

Result : Uncaught TypeError: Cannot read property 'text' of undefined.

此外，我尝试使用 $。每个，但没有效果。

Also I tried with $.each, but with no effect.

$.getJSON(url, function(data){
    $.each(data.response.venue.tips.groups.items.text, function (index, value) {
        console.log(value);
    });
});

我做错了什么？

推荐答案

您需要迭代组和项目。 $ .each（）将集合作为第一个参数， data.response.venue.tips .groups.items.text 尝试指向一个字符串。 组和项都是数组。

You need to iterate both the groups and the items. $.each() takes a collection as first parameter and data.response.venue.tips.groups.items.text tries to point to a string. Both groups and items are arrays.

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：

$.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);
});

这会给你：

用户：Damir P.

日期：1314168377

文字：ajd da vidimo hocu li znati ponoviti

User: Damir P.
Date: 1314168377
Text: ajd da vidimo hocu li znati ponoviti

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