[英]check to see if a sub array exists in JSON
这是json样本:
{
"kind": "shopping#product",
"id": "tag:google.com,2010:shopping/products/6582229/17914968800165668776",
"selfLink": "https://www.googleapis.com/shopping/search/v1/public/products/6582229/gid/17914968800165668776?alt\u003djson",
"product": {
"googleId": "17914968800165668776",
"author": {
"name": "Red Tag Market",
"accountId": "6582229"
},
"creationTime": "2010-11-30T10:00:00.000Z",
"modificationTime": "2011-05-01T09:20:00.000Z",
"country": "US",
"language": "en",
"title": "The Fantastic Mr. Fox - BLU-RAY/DVD",
"description": "Wit.",
"link": "ht361",
"condition": "new",
"gtin": "00024543657552",
"inventories": [
{
"channel": "online",
"price": 22.51,
"currency": "USD"
}
],
"images": [
{
"link": "http://208.131.143.232/i/6/3/0/7/6/1/8.jpg",
"thumbnails": [
{
"width": 60,
"height": 60,
"link": "hBEevU46OsArJElwIeErF_3E7Zzu12M2eLSvQBdYiMLaRWrI60aF8lHxRqOz-wkx2YJUIVdCrzrEQDWxgcc"
}
]
}
]
}
},
{
"kind": "shopping#product",
"id": "tag:google.com,2010:shopping/products/6296724/17894083551590155418",
"selfLink": "https://www.googleapis.com/shopping/search/v1/public/products/6296724/gid/17894083551590155418?alt\u003djson",
"product": {
"googleId": "17894083551590155418",
"author": {
"name": "eBay",
"accountId": "6296724"
},
"creationTime": "2011-04-04T00:43:02.000Z",
"modificationTime": "2011-04-04T00:43:02.000Z",
"country": "US",
"language": "en",
"title": "Fy.",
"link": "htt530831212&itemid\u003d140530831212&icep_meta_categ_id\u003d11232",
"condition": "used",
"gtin": "00024543657552",
"inventories": [
{
"channel": "online",
"price": 14.99,
"currency": "USD"
}
],
"images": [
{
"link": "http://i.ebayimg.com/00/%24%28KGrHqYOKkQE1r4Vh1gFBNl4n0t17g%7E%7E_1.JPG?set_id\u003d8800005007",
"thumbnails": [
{
"width": 60,
"height": 60,
"link": "http://lh
}
]
}
]
}
}
我想做的是查看data.items[i].product.images[]
存在。 如您所见,Images数组未出现在第二个响应中,因此在尝试出于任何目的使用data.items[i].product.images[]
那一刻杀死了我的JavaScript。 我一直在寻找并且尚未找到解决方案。
编辑:我只是尝试此,仍然没有骰子:
if(data.items[i].product.images !== undefined){
var image = 'images/inverticon.png';
}else{
var image = data.items[i].product.images[0].thumbnails[0].link;
}
我没有收到任何错误,脚本只是停止运行。 如果我省略了图像代码,则一切正常,只要返回的JSON具有image [],它就可以正常工作。
编辑:这是解决方案:
if(data.items[i].product.images !== undefined){
var image = data.items[i].product.images[0].thumbnails[0].link;
}else{
var image = 'images/inverticon.png';
}
if (data.items[i].product.images !== undefined) {
//do what you will
}
尝试访问不存在的对象的属性将返回undefined。 这很可能是您遇到的错误?
您了解Web浏览器中的Web检查器工具吗? 它们都有一个控制台,所有错误都将输出到该控制台。 如果您进行检查,就会发现出了什么问题。
您仍在尝试在该条件语句的else中访问images数组,这将导致错误。
应该是这样
if(data.items[i].product.images !== undefined){
var image = data.items[i].product.images[0].thumbnails[0].link;
} else {
var image = 'images/inverticon.png';
}
“不等于未定义”等同于说“已定义”
您是否有理由不将其解析为PHP数组,然后进行检查? 您标记了您的帖子PHP,所以我认为这就是您所使用的。
$myarray = json_decode($json);
if (isset($myarray->items[0]->product->images)) {
...
}
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