How Can I Show Dynamic Tool Tip For Dropdown Values?

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Am creating web page using bootsrtap.
I have added two drop downs. Values for drop downs will generate dynamically.So i want to show that value as tooltip. my drop down values are very lengthy.So i dont want to increase the size of drop down.I want to show tool tip for that long values.

jquery am using,

$(document).ready(function () {
    $("a").tooltip({

        placement: 'top'

    });
});

data-original-title="Abcdefghiklhuhsfjkhskd" currently am giving like this. But i want to give dynamically.
+Tool tip should show full value.Drop down should not extend as per the length of the value.