How to get selected items text using javascript

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Introduction:
In my previous article I have explained about How to replace a string in XSLT. In this article I am going to explain about how to get selected items text using javascript
Explanation:
I need to get the selected items text of a html select. For this below javascript function is used.

<script>
    function getSelectedText(elementId) {
        var elt = document.getElementById(elementId);

        if (elt.selectedIndex == -1)
            return null;

        return elt.options[elt.selectedIndex].text;
    }
</script>

Below is the sample usage of the code.
var selText=getSelectedText('mySelect')

Now  selText will contain the value of the selected items text.

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