javascript 检查 JSON 响应数据是否为空
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Check if JSON response data is empty
提问by rocket
The JSON response looks like this when it is empty when viewed in the browser console:
在浏览器控制台中查看时，JSON 响应为空时如下所示：
{"data":{},"status":200,"config":{"method":"GET","transformRequest":[null],"transformResponse":[null],"jsonpCallbackParam":"callback","url":"http://url/form/BN217473","headers":{"Accept":"application/json, text/plain, */*"}},"statusText":"","xhrStatus":"complete"}
In angular script I am checking if the response is empty but the check is not catching the empty response as the logic block is never executed
在 angular 脚本中，我正在检查响应是否为空，但检查未捕获空响应，因为逻辑块从未执行
if (response.data == '') {
console.log("no data found");
}
How can I check that my response is not empty?
如何检查我的回复是否为空？
回答by Sagar Kharche
Try below code snippet:-
试试下面的代码片段：-
if(!Object.keys(response.data).length){
console.log("no data found");
}
If you are getting data as empty object like data: {}, then you should check if there is any key inside the object or not.
如果您将数据作为像 data: {} 这样的空对象获取，那么您应该检查对象内是否有任何键。
回答by Chris Gunawardena
You can check the number of keys/properties with Object.keys(response.data).length === 0or less efficiently with JSON.stringify({}) == JSON.stringify(response.data)
您可以使用以下方法检查键/属性的数量 Object.keys(response.data).length === 0或效率较低JSON.stringify({}) == JSON.stringify(response.data)
回答by Virgile Junique
If you want to check if your response is not empty try :
如果您想检查您的回复是否为空，请尝试：
if ( json.length == 0 ) {
console.log("NO DATA!")
}
But i advice you to use lodashand his isNil()method or isEmpty()to check if your object is empty or null or undefined.
但我建议您使用lodash和他的isNil()方法，或者isEmpty()检查您的对象是否为空、null 或未定义。
Cheeers
干杯
