Disabled in dropdown

This is confusing me! Why do you want to disable the field based on whether the selected value is null?

not based on the selected value. sometimes the field will be populated will a record is created and sometimes not. 

Can you share the code snippet of that dropdown?

Can you share the code snippet of that dropdown?

disabled: {
if(
and(
a!isNullOrEmpty(
ri!record[] ),

local!isvalueavailable),
false,
true
),

},

Please share your code for the entire dropdown.  And as Stefan mentioned, please use a Code Box to enable us to see proper formatting and indentation.

a!dropdownField(
  label: "dropdown",
  choiceLabels: {},
  choiceValues: {},
  value: ri!record[fieldname],
  saveInto: ri!record[fieldname],
  disabled: {
    if(
      and(
        a!isNullOrEmpty(
          ri!record[],
          
        ),
        local!isValueAvailable
      ),
      false,
      true
    ),
    
  },
  required: true
)

Is that the real code? Line 11 does not look correct.

I didn;t mention the exact field here. But in my code I am referring to the dropdown field

OK. Then I need to repeat my question. Why do you make disabled depending on whether a value is selected?

Unknown said:

Is that the real code?

consider that Record Type code (when copied/pasted to plaintext) looks like incomprehensible gobbledygook - so most folks understandably obfuscate that stuff out.  Sad that we have to resort to such measures just to post code here, but meh...

Unknown said:

Why do you make disabled depending on whether a value is selected?

I'd ask it this way: what is the actual behavior you're wanting, and in exactly what way is your current implementation failing to do what you want?  I can't quite tell either of these things based on your original post.

My requirement here is, I pull the data from the external system. After pulling the data, when I view the record somteimes the dropdown field might get a value from the external system and sometimes it will be empty.
If the field is empty, then the user can select values from the dropdown. If the field is not empty (populated by the external system) then I want to disable the field, so that user can change the value

In my case, when I pull the data from the external system the field is blank. So the user can select the value from the dropdown. But once after I select a value from a dropdown, it's getting disabled ( I think it's because it checks the condition isnotnullorempty and it's getting disabled). But I want to remain it as a editable field ( since the data from the external system is blank)