check multiple values in an if statement in jquery/javascript

Question

I am trying to if the value of an input box is blank or not by doing the below:

var id = $(this).attr('id').substr(3);
var lengthname = $("#input_name_"+id).val().length;
var lengthrss = $("#input_rss_"+id).val().length;
if (lengthrss!=0 || lengthname!=0)
{
  // do something
}
else
{
alert('Values cannot be blank');
}

For some reason it is not doing the OR however if the user enters both values as blanks then the alert comes up??

Wladimir Palant · Accepted Answer · 2011-09-05 07:47:36Z

3

What you are looking for is an AND operation, not OR. The valid case is when both lengths are non-zero:

if (lengthrss!=0 && lengthname!=0)
{
  // do something
}

Alternatively:

if (lengthrss==0 || lengthname==0)
{
  alert('Values cannot be blank');
}

For reference: De Morgan's laws

answered Sep 5, 2011 at 7:47

Wladimir Palant

57.8k12 gold badges100 silver badges129 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Kavin Mehta Over a year ago

goshh...u r right....I feel dumb...i guess i can't think at 1 a.m. in the morning ;-)

Wladimir Palant Over a year ago

Yes, trivial mistakes are usually a reminder that it is bed time ;)

Collectives™ on Stack Overflow

check multiple values in an if statement in jquery/javascript

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related