使用Jquery从本地文件中获取JSON对象 [英] Using Jquery to get JSON objects from local file
问题描述
我正在尝试使用Jquery从本地文件中获取JSON对象(产品)列表,并将所有对象存储在名为allItems的单个数组中。该文件与代码位于同一目录中,并称为allItems.json。以下是我现在的做法:
I'm trying to get a list of JSON objects (products) from a local file using Jquery and store all the objects in a single array called allItems. The file is co-located in the same directory as the code, and it's called "allItems.json". Here's how I'm doing it now:
function getAllSupportedItems(){
var allItems = new Array();
$.getJSON("allItems.json",
function(data){
$.each(data.items,
function(item){
allItems.push(item);
});
});
return allItems;
}
基于这个例子: http://api.jquery.com/jQuery.getJSON/
推荐答案
对于 getAllSupportedItems
,为了能够返回任何项目,AJAX调用需要同步运行。
For getAllSupportedItems
to be able to return any items, the AJAX call needs to run synchronously.
getJSON
转换为以下异步调用:
getJSON
translates to the following asynchronous call:
$.ajax({
url: url,
dataType: 'json',
data: data,
success: callback
});
异步是默认值。因此,您需要明确地将您的请求更改为同步请求:
Asynchronous is the default. You therefore need to explicitly change your request to a synchronous one:
$.ajax({
url: url,
dataType: 'json',
data: data,
success: callback,
async: false
});
另一种方法是重新考虑使用 getAllSupportedItems $ c $的方式c>并将其变为异步实用程序:
An alternative is to rethink the way you use getAllSupportedItems
and make it into an asynchronous utility:
function getAllSupportedItems(callback){
$.getJSON("allItems.json",
function(data){
var allItems = [];
$.each(data.items,
function(item){
allItems.push(item);
});
callback(allItems);
// callback(data.items); should also work
});
}
更新
当我最初写这个答案时,jQuery没有内置的Deferred支持。今天做这样的事情更加简洁灵活:
Update
When I initially wrote this answer, jQuery didn't have built-in Deferred support. It is a lot more concise and flexible to do something like this today:
function getAllSupportedItems( ) {
return $.getJSON("allItems.json").then(function (data) {
return data.items;
});
}
// Usage:
getAllSupportedItems().done(function (items) {
// you have your items here
});
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