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lion/docs/docs/systems/form/model-value.md

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Systems >> Form >> ModelValue ||20

The modelValue or model can be considered as the ‘aorta’ of our form system. It is the single source of truth; not only for the current state of the form, also for all derived states: interaction, validation, visibility and other states are computed from a modelValue change.

Single source of truth

ModelValues are designed to provide the Application Developer a single way of programmatical interaction with the form for an Application Developer.

One single concept for Application Developers

Application Developers need to only care about interacting with the modelValue on a form control level, via:

  • .modelValue
  • @model-value-changed

Internal/private concepts like viewValue, formattedValue, serializedValue are therefore not recommended as a means of interaction.

For more information about parsing and the Unparseable type, see Formatting and Parsing