Detect when input has a 'readonly' attribute

Question

I want to throw an alert when an input has a \'readonly\' attribute. I have tried this:

  if($(\'input\').attr(\'readonly\') == \'readonly\'){

    alert(\"foo\"         


        

Answer 1

what about javascript without jQuery ?

for any input that you can get with or without jQuery, just :

input.readOnly

note : mind camelCase