Suppose "readOnlyField__c" is the field you want make readonly, then, Write a before update trigger. Check if the value of "readOnlyField__c" has changed like if (trigger.new.readOnlyField__c != trigger.old).readOnlyField__c)
Full Answer
How do I make a field read only in Salesforce?
Salesforce Classic:Click on Setup | Manage Users | User.Open the user record and navigate to 'Permission Set Assignments' section.Open the Permission Set assigned and go to System permission.Deselect the option 'Edit Read Only Fields'Save.
Can you make a required field read only salesforce?
To mark that field read only, go to that field and click on Set Field-Level Security(Screenshot 1) on that field anf then click on Read-Only check box(Screenshot 2).
How do you make a field read only in Salesforce screen flow?
>>Go to the Field and Click on the Set Field-Level Security button which is besides the Edit. >> Click on Read Only Checkbox besides the User's Profile. Which makes the field Read Only for the users who are all having the same profile.
Why after triggers are read only?
You are getting this error because you are in an after insert trigger and the records are read-only in that context as they have been written, but not committed, to the database. This kind of error occurs if you try to update lists/record which are/is read-only in the trigger execution. For example, trigger.
Can we make a required field read only?
At a simple level, you can't make a field read-only if it's required.... it doesn't make sense... the user wouldn't be able to save a record because they wouldn't be able to enter data in the required field.
How do you make a field read only using validation rule in Salesforce?
"View by Record Types". I would choose View by Record Types. Then when the matrix appears, select the field and the profile that you what to change (i.e., field: annual revenue for the contact manager is editable). Click on that item or "cell" and change the field level security to read only.
How do you make a field non editable in Salesforce using validation rule?
3 Answer(s)Go to the object's field page under Setup.Click on the view link for the field.Click the Set Field-Level Security button.Change the field to read-only for the appropriate profiles (You would need to change to appropriate profile to test)
What are the read only field in Salesforce?
When a flow tries to create or update records, fields that the running user can't edit are considered inaccessible , or read only. A field can be inaccessible because the user hasn't been granted permission to edit the field or because it's a system field that's always read only.
How do you lock a field in Salesforce?
Using Record Type & Page Layouts: Create two different record types say “Open” & “Locked” and change the record type of the record using workflow field update or trigger. And then create a separate page layout for the “Locked” record type with all fields marked as 'Read-Only'.
What is the difference between after and before trigger?
Before Trigger is a type of trigger that automatically executes before a certain operation occurs on the table. In contrast, after trigger is a type of trigger that automatically executes after a certain operation occurs on the table.
How many types of triggers are there in Salesforce?
two typesThere are two types of triggers. Before triggers are used to update or validate record values before they're saved to the database. After triggers are used to access field values that are set by the system (such as a record's Id or LastModifiedDate field), and to affect changes in other records.
Can we perform DML operation in before trigger?
Before Trigger: Before triggers are used to perform the logic on the same object and specifically we cannot use the DML operation (Insert, update, delete) on these triggers. These triggers fired before the data saved into the database.