I have the following JSON:
{
"meta": {
"limit": 20,
"next": null,
"offset": 0,
"previous": null,
"total_count": 0
},
"objects": []
}
I'm interested in objects: I want to know if objects is empty and show an alert:
something like this:
success: function (data) {
$.each(data.objects, function () {
if data.objects == None alert(0)
else :alert(1)
});
i don't know what is you meaning about empty object, but if you consider
{}
as a empty object, i suppose you use the code below
var obj = {};
if (Object.keys(obj).length === 0) {
alert('empty obj')
}
Use Array's length property:
// note: you don't even need '== 0'
if (data.objects.length == 0) {
alert("Empty");
}
else {
alert("Not empty");
}
== 0 because if objects is not array you'll get unexpected results. @GrantU consider checking the others.
objects key as an array in the JSON output.This is the best way:
if(data.objects && data.objects.length) {
// not empty
}
And it's the best for a reason - it not only checks that objects is not empty, but it also checks:
objects exists on dataobjects is an arrayobjects is a non-empty arrayAll of these checks are important. If you don't check that objects exists and is an array, your code will break if the API ever changes.
You can use the length property to test if an array has values:
if (data.objects.length) {
$.each(data.objects, function() {
alert(1)
});
}
else {
alert(0);
}
this was what i did, thanks @GilbertSun, on a jsonp callback when I got an undefined with data.objects.length
success: function(data, status){
if (Object.keys(data).length === 0) {
alert('No Monkeys found');
}else{
alert('Monkeys everywhere');
}
}
var myJson = {
a:[],
b:[]
}
if(myJson.length == 0){
//empty
} else {
//No empty
}
$(myJson).isEmptyObject(); //Return false
$({}).isEmptyObject() //Return true
