Strip white spaces on input

Use jQuery trim to remove leading and trailing white space

$.trim(" test case "); // 'test case'

To remove all whitespace…

" test   ing  ".replace(/\s+/g, ''); // 'testing'

To remove whitespace as it is entered…

$(function(){
  $('#noSpacesField').bind('input', function(){
    $(this).val(function(_, v){
      return v.replace(/\s+/g, '');
    });
  });
});

Live Example