html - JavaScript returning NULL/Undefined when trying to get a data attribute -


i have been trying values stored inside data attribute called data-title, javascript doesn't display value have stored inside it. been trying put value inside alert testing, doesn't work. following piece of code. thank you.

<select id='item_id' onchange='changevalue();'>     <option data-title="title 1">1</option>     <option data-title="title 2">2</option>     <option data-title="title 3">3</option>     <option data-title="title 4">4</option> </select>  <script type="text/javascript">  function changevalue(){      var option=document.getelementbyid('item_id');     alert(option.getattribute('data-title')); } </script>

to retrieve data-title value currently-selected option, select element lacking attribute:

function changevalue(){     var select = document.getelementbyid('item_id'),         option = select.getelementsbytagname('option')[select.selectedindex];     alert(option.getattribute('data-title')); }

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