Disabling a button based on attribute value

Hi,
I have written a function in ViewObjectImpl. I need to call it on a specific condition,that is, if a particular value for an attribute doesn't exist in the table. How can I achieve this?
Thanks & Regards

Hi,
There are couple ways to achieve this.
1. Enable the button only when there is a specific value exist in table.
You can write a method in your impl, that check if there are any matching rows in table and return true or false. Bind the disabled property to an attribute in your backing bean, execute the impl method in backing bean and let the property (which you bound to the disabled property of the button) hold the return value (true or false). Call this method appropriately based on your need.
2. Execute the method always and check the matching row in button.
In the impl method itself, you can check the table if the matching rows exist or not. If exists, then continue the execution of the method, else do nothing.
-Arun

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