Javascript 如何使用jquery检查JSON返回是否为空
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How to check if JSON return is empty with jquery
提问by BaconJuice
$.getJSON(url, function(json) {
var output = '';
$.each(json, function(i,d) {
if(d.DESCRIPTION == 'null'){
console.log("Its empty");
}
var description = d.DESCRIPTION;
output += '<tr><td>'+d.NAME+'</td><td>'+'<tr><td>'+d.DESCRIPTION+'</td><td>';
});
});
I tried adding the
我尝试添加
if(d.DESCRIPTION == 'null'){ console.log("Its empty");
to check if the object returned is empty, but it doesn't work.
检查返回的对象是否为空，但它不起作用。
Can someone explain to me what's wrong with this?
有人可以向我解释这有什么问题吗？
回答by Arun Pratap Singh
Below code(jQuery.isEmptyObject(anyObject)function is already provided) works perfectly fine, no need to write one of your own.
下面的代码（已经提供了jQuery.isEmptyObject(anyObject)函数）工作得很好，不需要自己写一个。
// works for any Object Including JSON(key value pair) or Array.
// var arr = [];
// var jsonObj = {};
if (jQuery.isEmptyObject(anyObjectIncludingJSON))
{
console.log("Empty Object");
}
回答by Kevin B
Just test if the array is empty.
只需测试数组是否为空。
$.getJSON(url,function(json){
if ( json.length == 0 ) {
console.log("NO DATA!")
}
});
回答by Justin Levene
if (!json[0]) alert("JSON empty");
回答by Hassan ALmasri
You can use $.isEmptyObject(json)
您可以使用 $.isEmptyObject(json)
回答by Ranjith
$.getJSON(url,function(json){
if ( json.length == 0 )
{
console.log("NO !")
}
});
