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Form Runtime

The Form Runtime is the context in which all Functions and Event Handles execute. All valid Functions and Event Handlers declared in a Form Schema are added as instance functions to the Form Runtime, and can be called by eachother through the this or functions keyword.

Example

<Functions>
<Function Name="log" Parameters="model, modelName, propertyName, newValue, oldValue">
console.log('Model ' + modelName + ' changed (property: ' + propertyName + ')');
console.log(model);
console.log(modelName);
console.log(propertyName);
console.log(newValue);
console.log(oldValue);
</Function>
<Function Name="doStuff" Parameters="newValue">
controls.Label1.setIsVisible(models.FormData.Bit);
controls.Input2.setIsEnabled(Models.FormData.Bit);
console.log(newValue);
</Function>
</Functions>

You can call a shared function from Event Handlers or other shared functions through the this or functions keyword:

<DataChangedEventHandler Value="{Binding Path:FormData.Bit}">
this.log($model, $modelName, $propertyName, $newValue, $oldValue);
// call shared function
functions.doStuff($newValue);
// or inline
controls.Label1.setIsVisible(models.FormData.Bit);
controls.Input2.setIsEnabled(Models.FormData.Bit);
</DataChangedEventHandler>

In addition to the custom functions and event handlers, the Form Runtime has the following API: