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Is there a javascript event that fires at every change of an asp.net textbox?

Last Modified: 2012-05-11
I want to set a value of a hidden field with a value of a textbox. This value should be set immediately after the content of the textbox has changed. onchange() just fires after leaving textbox, key events will miss the mouseclick+paste action. Surely I could use both of them (or maybe there are more possibilities?) but I'd like to know if there's one event that coveres all changes.

Thank you
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