How can I change the disabled of a message text input base on a choice

how can I change the disabled of a message text input when a dropdown list value is changed? I declare the primaryclientaction but I don't know how to make the event automatically change the disabled of the message text input to true or false.
HELP!!!! IT'S URGENT....

Hi,
assuming you are using ADF Faces:
Put a submit(); in the on-change javascript event of the dropdown.
In the disabled property of the input text use some EL to reference the value of the dropdown eg disabled="{#{! bindings.Fruit.inputValue == 'BANANA'}"
Brenden

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