When do we use "this" at a function??

Answer 1

I think it would be helpfull for your question

<button id="1" onClick="reply_click(this.id)">B1</button>
<button id="2" onClick="reply_click(this.id)">B2</button>
<button id="3" onClick="reply_click(this.id)">B3</button>

<script>
function reply_click(clicked_id)
{
alert(clicked_id);
}
</script>

Answer 2

Thank you my friend

Answer 3

no need for thank always be there for help^_^

Answer 4

Oh don not tell that it wasn't your duty