从外部json文件获取对象数组，并将其存储为JavaScript中的数组 [英] Get an array of objects from an external json file and store as an array in javascript

问题描述

如何将JavaScript数组分配给EXTERNAL json文件中的对象数组?

How do I assign a javascript array to that of an array of objects from an EXTERNAL json file?

这就是我尝试过的.

JavaScript代码段

var i = 0;
var testjson = $.getJSON('/TestJSON');
jsonObj = JSON.parse(testjson);

$("#testJSONBtn").click(function () {
    while (i <= jsonObj.events.length) {
        $("#JSONOutput").append(jsonObj.events[i].title + ", " + jsonObj.events[i].date + ", " + jsonObj.events[i].explanation + "<br/>")
        i += 1;
    }
});

JSON文件内容

{
"events":
[
    {"title":"Okmulgee Public Schools Starts 3rd Quarter" , "date":"1-2-2013" , "explanation":"Okmulgee Public Schools begins its third quarter."}
    {"title":"Okmulgee Public Schools-Closed in Observance of Martin Luther King Jr. Holiday" , "date":"1-21-2013" , "explanation":"The Okmulgee Public Schools will be closed in observance of the Martin Luther King Jr. holiday."}
    {"title":"Okmulgee Public Schools County Professional Day" , "date":"2-1-2013" , "explanation":"Okmulgee Public Schools County Professional Day is today."}
]
}

我在做什么错了?

推荐答案

AJAX函数没有数据返回值，它们只是返回一个AJAX对象.

AJAX functions do not have data return values, they just return an AJAX object.

您需要使用回调.

尝试一下:

$.getJSON('/TestJSON', function(jsonObj){
    $("#testJSONBtn").click(function () {
        for(var i = 0; i < jsonObj.events.length; ++i) {
            $("#JSONOutput").append(jsonObj.events[i].title + ", " + jsonObj.events[i].date + ", " + jsonObj.events[i].explanation + "<br/>")
        }
    });
});

更好:

var btn = $("#testJSONBtn"); //cache the element
var output = $("#JSONOutput"); // ^^^
$.getJSON('/TestJSON', function(jsonObj){
    btn.click(function () {
        var val = "";
        for(var i = 0; i < jsonObj.events.length; ++i) {
            val += jsonObj.events[i].title + ", " + jsonObj.events[i].date + ", " + jsonObj.events[i].explanation + "<br/>";
        }
        output.append(val);
    });
});

---

侧面:

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Side point:

我不知道它是否是故意的，但是在您的OP中，JSON文件看起来不合法，您缺少逗号. (

I don't know if it was on purpose or not, but in your OP the JSON file does not look legal, you are missing commas. (source)

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