Seitenhistorie
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Nuclos value list provider (VLP): dependent combo boxes, data source, layout rule update value list, Status/Process/Parameters, $username/$mandator. |
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Value list provider
Dependent selection lists in combo boxes – e.g. only the contacts of the selected customer.
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On this page
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What is a value list provider?
A value list provider (VLP) dynamically restricts the choices in a combo box / list of values – depending on another selected value. Typical cases: show only the contacts of a selected customer, or only the rooms of a selected building.
Example: contacts per customer.
Step 1: create the data source
Menu: Administration → Data sources → Valuelist Provider. Define a parameter (e.g. intid_kunde) that passes the internal ID of the triggering record.
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If the parameter is named |
The value list provider data source.
Step 2: add the VLP to the layout
In the layout editor attach the value list provider to the target field (here: contact) via the palette. An optional default flag lets you preselect a standard value (e.g. the default address).
Value list provider in the layout.
Step 3: create the layout rule
On the source field (here customer) define a layout rule:
| Field | Value |
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| Event | When the value changes |
| Action type | Update value list |
| Business object | BO of the target component (only for sub-forms; otherwise empty) |
| Target component | Combo box whose values are updated |
| Parameter | Parameter name from the data source |
Layout rule „update value list“.
Predefined value list providers
- Status: restricts the status field's value list to certain business objects (parameter business objects = internal BO name).
- Process: restricts the action field's value list (only on the
NuclosProcessfield). - Parameters: provides value lists in column definitions of sub-form data (parameter
showValue).
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System parameters in condition/SQL: |
VLP for text attributes
To offer a fixed value list for a text attribute (without a reference, e.g. for „salutation“), choose a combo box in the layout editor with show all attributes ticked, attach a VLP (leave the ID field empty). With value list editable users may also enter their own values.
Combo box with a value list provider for a text attribute.
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