I am using the formapi to create a form. On one of my fields I have an #ajax call. When the field is changed I call the function. I recreate the form and then replace the whole form on the page. This works fine.
When creating the form I have some logic that sets the form state to see if a field has a value. If it has a value then I show some more fields. If the value is not set then I don't show the fields. I am showing the fields by setting the
#access on the field.
I need to add some validation on the form when the ajax call is triggered. I have tried adding the validation using
form_set_error() in the function that creates the form and in the ajax callback but the error is not displayed on the screen.
Am I going about this the wrong way completely? How can I get the form error to display?