Access validation errors from JS

Validation error can be accessed and modified from client-side Javascript in the dotvvm.validation.errors collection:

for (const error of dotvvm.validation.errors) {
    console.log(error.errorMessage, "at", error.propertyPath, "value =", error.validatedObservable.state)
}

Each error has:

• errorMessage : string - message from the validator.
• propertyPath : string - validation path of the property with the error. The path is slash-delimited for nested objects and arrays: MyArray/10/MyProperty.
• validatedObservable : KnockoutObservable - KnockoutObservable with the error, you can primarily use it to obtain the value.

If you want to be notified about changes in the error array, subscribe to the dotvvm.validation.events.validationErrorsChanged event.

Modification

The validation module has removeErrors and addErrors methods. The removeErrors method simply takes a path where it will clear all errors recursively:

// clear all errors on the page
dotvvm.validation.removeErrors("/")

The addErrors method accepts an array of { errorMessage: string, propertyPath: string } objects:

dotvvm.validation.addErrors([
    {
        propertyPath: "MyObject/MyArray/3/MyProperty",
        validationError: "Server is on fire",
    }
])