Check if textbox is blank in javascript

Question

I have a email textbox in my web page. When user submits the page I am doing some client side validation using javascript. I can get the value of the textbox and compare it to know if it has any data or not. But in case user enters only blank spaces how will I bypass it.

I am using below mentioned code.

// Check the format of email only if it has some data.
// otherwise no checking is needed.
if ($('#txtEmail').val() != "")
{
     // do something
}

Thanks in advance.

Thanks all for the responses. .length is not working. When more than one space is entered then .length returns the number of spaces. Trim is useful. — Narendra
– Narendra, Commented Jul 19, 2012 at 9:29
well you can use the trim first then .length :) if ($.trim($('#txtEmail').val()).length) — Val
– Val, Commented Jul 19, 2012 at 9:31

bugwheels94 · Accepted Answer · 2014-07-09 08:06:35Z

13

Use $.trim() function to remove all white-space from beginning and end of the string

if ($.trim($('#txtEmail').val()) != "")
{
     // do something
}

edited Jul 9, 2014 at 8:06

answered Jul 19, 2012 at 9:15

bugwheels94

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1 Comment

Val Over a year ago

.trim() should not be used that way... it causes problems on one of the old browsers :) if ($.trim($('#txtEmail').val()) != "") instead :)

Pranay Rana · Accepted Answer · 2012-07-19 09:16:24Z

3

javascript

if((document.getElementById('bereich').value).length==0)

or jquery

if ($('#txtEmail').val()).length==0)

or

  if ($.trim($('#txtEmail').val()).length==0)

answered Jul 19, 2012 at 9:16

Pranay Rana

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1 Comment

Pranay Rana Over a year ago

@AnkitGautam - for your kind info that y i used lenght....and anyway i updated answer with trim also

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