I set an array which have key in string Like below in my code :
var a = new Array();
a[1] = new Array();
a[1]['mystring'] = new Array();
a[1]['mystring'] = 'test';
if(isNullValues(a[1])) {
alert("Array Empty.");
}
function isNullValues(data) {
if (data == undefined || data == null || data.length == 0 || data == "") {
return true;
} else {
return false;
}
}
It alerts me Array Empty string. But it shouldn't return this?
There are no associative arrays in JavaScript. What you are doing is adding a property "mystring" to the array in a[1]. Hence, the internal counter "length" does not get incremented and a[1].length == 0 is true, therefore "isNullValues()" returns true.
You can "dirty fix" this by using a plain object:
var a = new Array();
a[1] = {};
a[1]['mystring'] = 'test';
Try this one:
var a = new Array();
a[1] = new Object();
a[1]['mystring'] = 'test';
if(isNullValues(a[1])) {
alert("Array Empty.");
}
function isNullValues(data) {
if (data == undefined || data == null || data.length == 0 || data == "") {
return true;
} else {
return false;
}
}
I changed new Array() in new Object().
You can also write a as var a = [undefined, {mystring: 'test'}];
The code shown should indeed display the alarm because:
a[1]['mystring'] = new Array();
Simply adds a new property called mystring to the array contained in a[1] meaning that:
a[1].length
... is still 0, since no elements are being added to the actual array. And with 0 elements in the array, your isNullValues function returns true because of the check:
data.length == 0
... causing the alert to be displayed.
As it's been said, your first problem is using an array instead of an object. Now, if you want to check if an object is empty (has no keys), you have to loop its keys:
function isObjectEmpty(obj)
for(var p in obj) {
if(obj.hasOwnProperty(p)) return false;
}
return true;
}
else{console.log(1)}), and it does log 1.