Remove spaces in a Javascript variable

Question

I'm using AJAX to retrieve data from MYSQL database through PHP.

However, if there is no result found, the variable still has two spaces. I found the problem using alert(data.length);. The result is 2, which means there are two spaces.

How can I remove these spaces so that if there is no result, I could display a message using if(data == ''){}?

Thank you!

possible duplicate of Remove characters from a string and How remove blank characters from a string in javascript?. — Felix Kling
– Felix Kling, Commented Nov 28, 2012 at 20:29
@bfavaretto - I tried to do so, but I don't know, query passes through if($query) even query is empty — Naveen Gamage
– Naveen Gamage, Commented Nov 28, 2012 at 20:42

VisioN · Accepted Answer · 2012-11-28 20:20:00Z

9

This is called string trimming. And here is one option for that in pure JavaScript:

var len = data.replace(/\s/g, "").length;

However, in modern browsers there is a string trim() function for that:

var len = data.trim().length;

answered Nov 28, 2012 at 20:20

VisioN

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1 Comment

Naveen Gamage Over a year ago

but I don't want to remove spaces if there are some results, then spaces in those results will be also removed..I can try, if data.length == 2 then i can trim it.. thank you for ur answer...

Bruno · Accepted Answer · 2018-04-26 05:32:12Z

3

I can't understand why you have those two empty spaces in the first place. If it's a suitable option for you, I would try to remove those spaces at the origin, so from the server response.

If that's not possible you could use String.prototype.trim to remove leading/trailing white space. This would allow you to write your check as below

if (data.trim().length === 0) {
  ...
}

edited Apr 26, 2018 at 5:32

answered Nov 28, 2012 at 20:20

Bruno

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Comments

lostsource · Accepted Answer · 2012-11-28 20:20:44Z

1

var str = "lots of whitespace";
str.replace(/\s+/g, ''); // 'lotsofwhitespace'

answered Nov 28, 2012 at 20:20

lostsource

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Community · Accepted Answer · 2017-05-23 12:16:09Z

1

See this post where the topic is covered deeply, if you use jQuery, you can use $.trim() which is built-in.

edited May 23, 2017 at 12:16

CommunityBot

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answered Nov 28, 2012 at 20:21

David Müller

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echo_Me · Accepted Answer · 2012-11-28 20:22:42Z

1

if your variable is data then try this

    data.replace(/\s+/g, '');

and assign it to other variable if you want

data2 = data.replace(/\s+/g, '');

answered Nov 28, 2012 at 20:22

echo_Me

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KingKongFrog · Accepted Answer · 2012-11-28 20:22:42Z

1

3 options:

var strg = "there is space";
strg.replace(/\s+/g, ' ');

or:

$.trim()

or:

String.prototype.trim = function() { 
    return this.replace(/^\s+|\s+$/g, ""); 
}

var strg = "there is space";
strg.trim();

answered Nov 28, 2012 at 20:22

KingKongFrog

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1 Comment

Naveen Gamage Over a year ago

but I don't want to remove spaces if there are any results, then spaces in those results will be also removed.. now I can do if data.length == 2 then trim it using ur way.. thank you very much..

AJ Genung · Accepted Answer · 2018-04-26 05:36:11Z

1

data = data.split(' ').join('') that will remove all spaces from a string.

answered Apr 26, 2018 at 5:36

AJ Genung

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