Dragging and dropping onto a textarea

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I have a textarea in which I want to be able to drag and drop values. These values are one of many pre-defined values. For explanation sake lets say in another html element(s) (table, labels, textboxes or anything) I display "one","two", etc. User should be able to drag and drop from here onto the textarea, and when they do, I want the value dropped at the cursor location to be "1","2" etc. Please assist how I can get this done.