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Text field enabling/disabling based on the data from the database

 
Greenhorn
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Hi

I would enable the field only if there is no data from the database(null. empty)
other wise if there is data disable the feild

can some one please send me a sample code.
 
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When creating the markup for the field, place the disabled attribute on the field if the condition is met.
 
Don't get me started about those stupid light bulbs.
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