Check if textbox has empty value

Question

I have the following code:

var inp = $(\"#txt\");

if(inp.val() != \"\")
// do something

Is there any other way to check for empty textbox

Answer 1

var inp = $("#txt").val();
if(jQuery.trim(inp).length > 0)
{
   //do something
}

Removes white space before checking. If the user entered only spaces then this will still work.

Answer 2

if ( $("#txt").val().length > 0 )
{
  // do something
}

Your method fails when there is more than 1 space character inside the textbox.

Answer 3

if (inp.val().length > 0) {
    // do something
}

if you want anything more complicated, consider regex or use the validation plugin which takes care of this for you

Answer 4

$('input:text').filter(function() { return this.value.length > 0; });

Answer 5

Use the following to check if text box is empty or have more than 1 white spaces

var name = jQuery.trim($("#ContactUsName").val());

if ((name.length == 0))
{
    Your code 
}
else
{
    Your code
}

Answer 6

if ( $("#txt").val().length == 0 )
{
  // do something
}

I had to add in the == to get it to work for me, otherwise it ignored the condition even with empty text input. May help someone.