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Validation rule for custom button

Here is my issue
i have a custom button that converts lead, however if specific lead field  is populated i woudl like to be able to disable this button. is it possible? or at least i like to error show up says operation not possible, and prevent from executing the script that is assigned to the button.
Max A
Hi Max,
You can't programmatically remove a button on a standard page layout, but if you build a Visualforce page you could build logic like that.
Another option, use the AJAX Toolkit behind your button and have a conditional statement that queries your lead field and either displays an alert or executes your convert. You can find convertLead examples in the docs.
Hope that helps,