Check if element contains another one in jQuery -


I found many related things on stack overflow but are not applicable to my case.

For all this example, I need to see that there is an element in another element, and if yes, then add something. 

  $ (".bt_repondre"). Click (function () {comment = $ (this) Parent (). Parent (). (); // I want to comment whether the comment should be a .comment_full element, if not, Attach the comment .append ('add');});   
 Hope you can help me, I tried many things ...   
 
 
 just use the  .find ()  and check whether the element returns, such as:  
  $ (".bt_repondre" ). Click (function () {Comment = $ (this) .Parent () .Parent (); if (! Comment.find ('. Comment_full') length) {comment.append ('add'); }});

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