javascript - 'undefined' returned from .each ran on tr with id selection -

problem

i'm trying run through every row in table has id in particular format. correct number of rows being selected i'm encountering 'undefined' issue whenever try attributes obj.

<tr class="" data-uid="45" id="fixed_user_45">... 

and javascript...

$('tr[id^="fixed_user_"] ').each(function(obj, i) {  var id = $(obj).id; // returns 'undefined' console.log(id); //prints 'undefined' correct number of times  }); 

this happening regardless of attribute try select, , how go - i.e. innertext, innerhtml, .attr('data-uid'). undefined.

---

other details:

for completeness... i'm going cycle through each of td after have nested following within above each function.

$('td').each(function (obj, i) { 

---

thanks help.

obj index , i element case. data-uid use data() function below.

$('tr[id^="fixed_user_"] ').each(function (obj, i) {      var id = $(i).data('uid');       console.log(id);  });