CODEWITHSUNDEEP
javascriptjqueryarrays
Solomon Sam
Solomon Sam

Reputation: 268

how to find out null values in an object in javascript?

im trying to find a way to alert when there is a null values in an object, if its present it should alert fail and if it doesn't it continues with the another action. Currently im able to alert for each key. with this code:

var ave = {
 'a': '02',
 'b': '04',
 'c': '',
 'd': '',
 'f': '07'
 };

var total = 0
$.each(ave, function(key, value) {
  var numbersA = total + value.length;
    if (numbersA === 0) {
       alert("Fail!");
     } else {
       alert("Pass!");
     }
});

It pops up Fail! twice and Pass 3 times. i want it to alert fail even if there is single null value present in the object. Is there way to do it?

Upvotes: 0

Views: 238

Answers (4)

The Alpha
The Alpha

Reputation: 146191

I missed it but the shortest one

var ave = {
  'a': '1',
  'b': '04',
  'c': '4',
  'd': '',
  'f': '1'
};

(function(){
    var v='Success';    
    for(var x in ave) if(!ave[x]) { v='Fail'; break;}
    alert(v);    
})();

DEMO.

OR

function is_falsy(arg){
  var what=true;    
  for(var x in arg) if(!arg[x]) { what=false; break;}
  return what;    
}
alert(is_falsy(ave));

DEMO.

Upvotes: 0

Jérôme
Jérôme

Reputation: 2090

You can test the following code here, play with the two sets of data. Note, that the default is 'ave_success', so the alert "Success !" will pop up when you will open the link.

Change "$.each(ave_success" to "$.each(ave_fail" to verify that the wrong data is rejected.

Note that an empty string '' is not considered as null

'' === null

will return false

var ave_fail = {
  'a': '02',
  'b': '04',
  'c': '',
  'd': '',
  'f': '07'
};

var ave_success = {
  'a': '02',
  'b': '04',
  'f': '07'
};

var total = 0
var success = true;

$.each(ave_success, function(key, value) {
  var numbersA = total + value.length;
  if (numbersA === 0) {
    alert("Fail on index " + key + ' !');
    success = false;
    return false;
  }
});

if (success) alert("Success !");

​

Upvotes: 1

Ry-
Ry-

Reputation: 224858

I would use a for in loop; jQuery's jQuery.each isn't well-suited to this situation.

var ave = {
 'a': '02',
 'b': '04',
 'c': '',
 'd': '',
 'f': '07'
};

var success = true;

for(var x in ave) {
    if(ave.hasOwnProperty(x)) {
        if(ave[x] === '') {
            success = false;
            break;
        }
    }
}

if(success) {
    alert('Pass!');
} else {
    alert('Fail!');
}

Upvotes: 2

jeff
jeff

Reputation: 8338

Just set a global variable named failed and alter its value if any of the properties are null:

var ave = {
 'a': '02',
 'b': '04',
 'c': '',
 'd': '',
 'f': '07'
 };

var failed = false;
var total = 0;
$.each(ave, function(key, value) {
  var numbersA = total + value.length;
    if (numbersA === 0) {
       failed = true;
    }
});
if (failed)
    alert("Fail!");

Also, note that I'm using your method to check for null values, which is incorrect. If you wanted to actually check for null values, you would changed

if (numbersA === 0) {
    failed = true;
}

to

if (numbersA === null) {
    failed = true;
}

and then, if you wanted ave to fail, you would need to change the empty strings to null as well:

 var ave = {
 'a': '02',
 'b': '04',
 'c': null,
 'd': null,
 'f': '07'
 };

Upvotes: 1

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