Cannot getting attribute value of the tr element

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Javascript

jQuery

HTML5

I want to save data from table to database so using jquery, and html attributes to get the table values and i am differentiating new and old data on table from adding a attribute on tr(table row) that is data_histry="new" or data_histry="old"

when i saving then jquery cannot get this attribute from table attribute..


please help

What I have tried:

adding data in table

var markup = "<tr id='tab" + tabid + "' class='test old' style='background-color:#E9E9E9;' data_type='test' data_histry='old'><td class='data-name' medi-id='"+ data[i].tid +"'>" + data[i].name + "</td><td class='data-dis'>" + data[i].descript + "</td><td><button test-id='" + data[i].id + "' type='button' class='btn btn-danger table-delete'>"></button></td></tr>";

$("#table-body").append(markup); 

and want to get property from attribute by the process from loop

console.log($('#tab'+i).attr('data_histry'));

where #tab is id of tr and i is counting variable

and on console its giving me

undefined