获取下拉文本给定值

I have an Ajax call that will return the value of the drop down. I want to use this value to get the text to populate a table.

What would be the correct syntax for:

var dropDownText = $("#dropDownId").SelectedValue[valueFromAjax].Text

So that dropDownText will contain a string that corresponds to the value in the drop down.

This will work

$("#dropDownId option[value='" + valueFromAjax + "']").text();

Demo: http://jsfiddle.net/tymeJV/YeASm/