javascript - How to get the current value of attribute -

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i have table gets data database, each column contains button gives review of particular row in modal box, modal box contains next , previous button, next gives details of next row of table , previous give previous data of row. question is:

i able next , previous once?

 $('#review_essay').delegate('.navbtn', 'click', function () {      var current_row_id = $(this).parents('#review_essay').attr('current_row_id');      var position_value = $(this).attr('position_value');      var navvalue = parseint(current_row_id) + parseint(position_value);      alert(current_row_id)      alert(position_value)      alert(navvalue)      var qid = $('#essay_data').find('tbody').find('tr').eq(navvalue - 1).attr('qid');      alert(qid);      var uid = $('#essay_data').find('tbody').find('tr').eq(navvalue - 1).attr('uid');      var paper_id = $('#essay_data').find('tbody').find('tr').eq(navvalue - 1).data('paper_id')      var session_id = $('#exam_details').attr('session_id')      var exam_id = $('#exam_details').attr('exam_id')      //alert('reached');      navigate(exam_id, session_id, paper_id, qid, uid);  });

it not performs more once. current_row_id remain 0.

the 1 problem i'm seeing not updating current_row_id update navvalue

$('#review_essay').delegate('.navbtn', 'click', function () {     var current_row_id = $(this).parents('#review_essay').attr('current_row_id');     var position_value = $(this).attr('position_value');     var navvalue = parseint(current_row_id) + parseint(position_value);     alert(current_row_id)     alert(position_value)     alert(navvalue)     var qid = $('#essay_data').find('tbody').find('tr').eq(navvalue - 1).attr('qid');     alert(qid);     var uid = $('#essay_data').find('tbody').find('tr').eq(navvalue - 1).attr('uid');     var paper_id = $('#essay_data').find('tbody').find('tr').eq(navvalue - 1).data('paper_id')     var session_id = $('#exam_details').attr('session_id')     var exam_id = $('#exam_details').attr('exam_id')     //alert('reached');     navigate(exam_id, session_id, paper_id, qid, uid);      //update current_row_id new value     $(this).parents('#review_essay').attr('current_row_id', navvalue); });

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