Check if textbox has empty value

I have the following code:

var inp = $("#txt");

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

Is there any other way to check for empty textbox using the variable 'inp'

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

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.

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

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

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