How can i show textbox as a Dropdownlist on mouseover

When I hover over a textbox I want it to be displayed as a dropdown list, then after I click it I want it to be displayed as a text box a开发者_JAVA技巧gain, how can this be done using jquery?

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Try this JqueryUI Autocomplete Box, It can be tweaked as ComboBox as well.

http://jqueryui.com/demos/autocomplete/

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I suggest to use this.