Comparison of two String is not working in script

Question

Actually in my function I have to compare two strings, the one string I fetch through the db and compare to the null string but it's not working.. Here is my Code:

   order.items.forEach(function(entry) {
                            result += '<tr>' 
                                      + '<td>'+'<font size=2>'+ a++ + '</font>'+ '</td>'
                                      + '<td>' +'<font size=2>'+ entry.title + '</font>'+ '</td>'
                                      + '<td>' +'<font size=2>'+ entry.quantity + '</font>'+'</td>'        
                                    if(entry.personalization == 'null')     //here is the problem                                                       
                                      + '<td>' +'<font size=2>'+ 'No Personalization' + '</font>'+'</td>'
                                    else
                                      + '<td>' +'<font size=2>'+ entry.personalization + '</font>'+'</td>'                                          


                                    + '</tr>';
                        })

                     result +='</table>';

$('.modal-body').html(result);

@Ripun What if entry.personalization is set to zero? Will your tip still hold? — spender
– spender, Commented Jun 17, 2016 at 10:58
@spender he is assuming the entry.personalization as null value when checking so if it is set to 0 then there is no meaning on checking for null isn't it ? — Ripun
– Ripun, Commented Jun 17, 2016 at 10:59
Can you tell us what the value of typeof entry.personalization is? — spender
– spender, Commented Jun 17, 2016 at 10:59

Tirthraj Barot · Accepted Answer · 2016-06-17 11:44:35Z

2

Use console.log(entry.personalization) to check value.

Dhara's answer should work...

I also use it for null check.

(!entry.personalization)

or try

(entry.personalization != "")

edited Jun 17, 2016 at 11:44

Tirthraj Barot

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answered Jun 17, 2016 at 11:07

Akhil Menon

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Comments

Dhara Parmar · Accepted Answer · 2016-06-17 10:56:46Z

1

To check empty or null string in jquery:

if (!entry.personalization) {
    // is empty
}

edited Jun 17, 2016 at 10:56

answered Jun 17, 2016 at 10:52

Dhara Parmar

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1 Comment

Dhruv Tyagi Over a year ago

@KartikeyaKhosla $.trim() is used for Remove the white spaces at the start and at the end of the string.

Tirthraj Barot · Accepted Answer · 2016-06-17 11:04:44Z

1

As mentioned in your question, if one string i fetched by you and the other string is "null", It is a clear question of string comparison and not checking null...

Javascript has localeCompare() method to compare strings..

You should use

entry.personalization.localeCompare("null");

or its inverse

var n = "null";
n.localeCompare(entry.personalization);

this function returns boolean.

answered Jun 17, 2016 at 11:04

Tirthraj Barot

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7 Comments

Tirthraj Barot Over a year ago

what does it return console.log(entry.personalization)

Dhruv Tyagi Over a year ago

actually i dont know how to use console.log() so i will update the result soon

Tirthraj Barot Over a year ago

no problem... let me tell you.... console.log() is a function which will log the values inside the console... If you want to see it, press F-12 on your keyboard with a browser open and go to its console tab... you will see the value of console.log() in it...

Tirthraj Barot Over a year ago

that means your entry.personalization holds null.. and not "null"

Tirthraj Barot Over a year ago

Let us continue this discussion in chat.

|

Akshay · Accepted Answer · 2016-06-17 10:52:12Z

0

You don't need to wrap null around ''.

Simply use :-

if(entry.personalization == null)

answered Jun 17, 2016 at 10:52

Akshay

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