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.

Solution 1

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

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

Solution 2

javascript

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

or jquery

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

or

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