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docs: Added expressions for validating if a field is empty or not #4353

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Oct 14, 2024
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docs: Added expressions for validating if a field is empty or not #4353

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844a93c
Updated docs to include info regarding on validating is field is empt…
svandenhoek Oct 14, 2024
2f8b671
Rewrote explanation a bit to include reference to required
svandenhoek Oct 14, 2024
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8 changes: 8 additions & 0 deletions docs/molgenis/use_schema.md
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Expand Up @@ -282,6 +282,14 @@ expression itself is shown. Otherwise, the return value of the expression will b
| `/^([a-z]+)$/.test(name)` | Application of validation rule failed: /^([a-z]+)$/.test(name) |
| `if(!/^([a-z]+)$/.test(name))'name should contain only lowercase letters'` | Application of validation rule failed: name should contain only lowercase letters |

Special attention needs to be paid when validating if a field is empty or not (as filled in fields that get emptied are different from never filled in fields).
While [required](#required) should be used to ensure a field itself is filled, when creating expressions (that include other fields), use the following:

| validation | functioning |
|--------------------------|-----------------------------------|
| `columnName?.length > 0` | Field 'columnName' must be filled |
| `!(columnName?.length)` | Field 'columnName' must be empty |

Visible expressions must return a value that is not false or undefined, otherwise the column stays hidden in the user interface. In the event that javascript
throws an exception, this is shown in user interface/error message. For example:

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