Getting data-* attribute for onclick event for an html element

Like this:

$(this).data('id');
$(this).data('option');

Working example: http://jsfiddle.net/zwHUc/

You can achieve this $(identifier).data('id') using jquery,

    <script type="text/javascript">

        function goDoSomething(identifier){     
            alert("data-id:"+$(identifier).data('id')+", data-option:"+$(identifier).data('option'));               
        }

    </script>

    <a id="option1" 
       data-id="10" 
       data-option="21" 
       href="#" 
       onclick="goDoSomething(this);">
           Click to do something
    </a>

javascript : You can use getAttribute("attributename") if want to use javascript tag,

    <script type="text/javascript">

        function goDoSomething(d){
            alert(d.getAttribute("data-id"));
        }

    </script>

    <a id="option1" 
       data-id="10" 
       data-option="21" 
       href="#" 
       onclick="goDoSomething(this);">
           Click to do something
    </a>

Or:

    <script type="text/javascript">

        function goDoSomething(data_id, data_option){       

            alert("data-id:"+data_id+", data-option:"+data_option);
        }

    </script>

    <a id="option1" 
       data-id="10" 
       data-option="21" 
       href="#" 
       onclick="goDoSomething(this.getAttribute('data-id'), this.getAttribute('data-option'));">
           Click to do something
    </a>