This REDCap module provides rich control of default values for data entry fields via a set of action tags. These action tags allow fields to be populated based on values from an ordered list of fields and static values. The fields can be read from the current event or the previous event in longitudinal projects.

• REDCap >= 8.0.0 (for versions < 8.0.0, REDCap Modules is required).

• Clone this repo into to <redcap-root>/modules/auto_populate_fields_v2.2.
• Go to Control Center > Manage External Modules and enable Auto Populate Fields.
• For each project you want to use this module, go to the project home page, click on Manage External Modules link, and then enable Auto Populate Fields for that project.

By default, when a field that is hidden by branching logic contains a @DEFAULT action tag, an annoying alert is displayed on page load.

ERASE CURRENT VALUE OF FIELD "<field_name>"?

This module changes the default branching logic behavior in order to avoid that. Now, when some non-empty field gets hidden by branching logic, no more warning messages are shown - instead, the hidden value persists available until form submission, when it is finally erased.

This module changes the display of selection fields when they are referenced in @DEFAULT action tags - instead of the label, the key is returned. Example: let's say we have a dropdown field called animals, whose options are:

1,Lion
2,Monkey

If we define somewhere @DEFAULT="[animals]", the returned value will be 1 (instead of "Lion") or 2 (instead of "Monkey").

This module provides 2 new action tags:

Provides the possibility to define secondary, tertiary, etc default values. If @DEFAULT returns an empty value, the next tag available - let's say @DEFAULT_1 - is checked. If @DEFAULT_1 returns empty, the next tag available - let's say @DEFAULT_2 - is checked, and so on. This is useful when a fallback value is needed for piping (e.g. @DEFAULT="[first_name]" @DEFAULT_1="Joe Doe").

Sets a field's default value based on its own value in a previous event. To map the default value from another field, you may specify the source field name as a parameter to the action tag, e.g @DEFAULT-FROM-PREVIOUS-EVENT="source_field". Analogously to @DEFAULT_<N>, @DEFAULT-FROM-PREVIOUS-EVENT_<N> is also provided.

If your events are not necessarily arranged in a chronological order, you can enable an option to auto-detect the last chronological event. To do that, go to your project page, then access External Modules (at the left sidebar), and then click on Auto Populate Fields configuration button:

When using @DEFAULT_<N> and @DEFAULT-FROM-PREVIOUS-EVENT_<N> together, using unique numbers on each action tag to ensure the desired precedence. E.g.

@DEFAULT-FROM-PREVIOUS-EVENT_1='initial_dose'
@DEFAULT-FROM-PREVIOUS-EVENT_2=intermediate_dose
@DEFAULT-FROM-PREVIOUS-EVENT_3="final_dose"
@DEFAULT_4="7"

In the above example initial_dose from the previous event will be used. Lacking that, intermediate_dose will be used. If none of initial_dose, intermediate_dose, and final_dose have been set, the value of 7 will be used.

Note that @DEFAULT is synonymous with @DEFAULT_0. Similarly @DEFAULT-FROM-PREVIOUS-EVENT is synonymous with @DEFAULT-FROM-PREVIOUS-EVENT_0.

Note that the square brackets, [] common to REDCap piping are neither required nor supported in @DEFAULT-FROM-PREVIOUS-EVENT and @DEFAULT-FROM-PREVIOUS-EVENT_<N>. They are required in @DEFAULT_<N> just like @DEFAULT.

Please note that when using Enable chronological previous event detection, deleting data from a form might change the expected behavior of auto-population.

Though the data is erased, the null value written to the record is still a legitimate value that could be copied to next event filled in. This will only occur in new data entry if the last event in the sequence was deleted. Note that "sequence" here refers to chronological order.

For example, if data is keyed into the wrong event and deleted, the data will not auto-populate when the correct event is opened. That said, if you open the correct event before deleting the data from the wrong event, the data keyed into the wrong event will auto-populate into the correct event.

An example project that demonstrates some of the features of this module is available in the examples folder.