jquery - .addClass('disabled') doesn't work -

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i having trouble disabling button. trying disable button unless typing words in input. following code.

$('.btn.btn-default').click(function(){     var post = $('input:text').val();     $('<li>').text(post).prependto('.posts');     $('input:text').val("");     $('.count').text('100');     $('.btn.btn-default').addclass('disabled');     });   $('input:text').keyup(function(){     var postlength = (this).val().length;     var charactersleft = 100 - postlength;     $('.count').text(charactersleft);        if (charactersleft < 0){     $('.btn.btn-default').addclass('disabled');     }     else if (charactersleft == 100){         $('.btn.btn-default').addclass('disabled');      }     else{         $('.btn.btn-default').removeclass('disabled');     } });  $('.btn.btn-default').addclass('disabled');  };

the following html

<div class= "blank">     <input type="text" id="form-control" placeholder="please leave comment here."/>     </div>       <div class = "status">     <div class= "count">100</div>     <input class="btn btn-default" type="submit" value="post">     </div>      <ul class="posts">     </ul>

typo:

(this).val().length; ^^^

add missing $. should error in console pointing out "val not function".

also adding class not disable button. need set property.

$(".btn.btn-default").prop('disabled', true); $(".btn.btn-default").prop('disabled', false);

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