javascript - Jquery script for checking if input is not empty. A space button issue -


i've script, validates if input not empty. works, problem appears if click space button. enables button, , allows send empty input. wonder, guys, possible upgrade script , fix issue?

the script:

 $(document).ready(function(){   $('.post_button').attr('disabled',true);   $('.message').keyup(function(){     if($(this).val().length !=0){         $('.post_button').attr('disabled', false);     }     else     {         $('.post_button').attr('disabled', true);             }  })  });

trim value using trim() , check length if don't want send spaces. 

 $(document).ready(function () {       $('.post_button').attr('disabled', true);       $('.message').keyup(function () {           if ($.trim($(this).val()).length != 0) {              $('.post_button').attr('disabled', false);          } else {              $('.post_button').attr('disabled', true);          }      })  });

use $.trim($(this).val()) $(this).val().trim() doesn't work in ie8.


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