Using jquery to get all checked checkboxes with a certain class name -

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I know that I can get all the checkboxes on the page on this checkbox: 

  $ ('Input [type = checkbox]'). Each (function () {var sThisVal = (this.checked? $ (This) .val (): "");});   
 But now I'm using it on a page that has some other checkboxes I do not want to include. How can I change the checked-up check box only to the above code on which there is a certain category on them?   
 
 
  $ ('theClass: checkbox: check')  To class  theClass .

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