javascript - validation of password field using a compare to string method or using an == but both not working -


iam trying validate password field re-type password field not working :

function signup() {      alert('step one')     var q=signuppasswordfield.val();     var z=signupretypepasswordfield.val();      if(q.tostring()==z.tostring()){          alert('valid')         var name= $('#signupname').val();         var username=$('#signupusername').val();         var userpassword=$('#signuppasswordfield').val();         var emailaddress=$('#signupemail').val();         callserver('successadd','checkconnection',false,'addmember.php',{name:name,username:username,userpassword:userpassword,emailaddress:emailaddress});     }      else {          alert('not valid');         alert("please check entered info.")     }  } 

i think need use jquery selector when assigning q , z using jquery val()
or put way, val() not defined html dom element

var q=$('#signuppasswordfield').val(); var z=$('#signupretypepasswordfield').val(); 

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