formValidityState

EventEmitter that monitors a form element's validity, applying classes and emitting events accordingly.

This module will monitor all forms on a page matching the selector option, applying a class name invalidClass to invalid fields and the form itself. The module also augments EventEmitter, providing more granular control to manage a form's state.

Form and field validity states are determined as fields are updated with native HTML5 form validation. Therefore all validation rules (such as required, min/max values, and pattern matching) should be set directly in the HTML as they would be normally.

Form submission is prevented if a form is in an invalid state when submitted. An event is emitted providing the original submit event as a parameter. This allows the developer to prevent submission regardless of the form's state.

Installation

Install via npm:

$ npm i form-validity-state -S

Usage

Default implementation (auto-initialization):

var FormState = require('form-validity-state');
var formState = new FormState();

Manual initialization:

var FormState = require('form-validity-state');
var formState = new FormState({autoInitialize: false});

// Attach your listeners or whatever 
// else needs doing before the module
// queries the DOM and begins monitoring
formState.initialize();

Options

Param	Type	Default	Description
options.invalidClass	string	"invalid"	Class to be applied to invalid forms and inputs
options.selector	string	"form[data-validation-state]"	Selector used to query participating form elements
options.autoInitialize	boolean	true	DOM is queried upon instantiation; set to false if you need to capture the initial "invalidated" event

Methods

initialize() ➝ null

Manually initializes module in case event listeners should be tethered before initial validity state is established

destroy() ➝ null

Destroys the instance, removing all event listeners and DOM references

Events

invalidated

The invalidated event is broadcast when a form's validity state changes from valid to invalid

Name	Type	Description
data	object	Emitted data object
data.evt	event	Original event
data.formObject	object	formObject of input that event was triggered from

---

submit-blocked

The submit-blocked event is broadcast when a form's submission is prevented because it is in an invalid state

Name	Type	Description
data	object	Emitted data object
data.evt	event	Original event
data.formObject	object	formObject of input that event was triggered from

---

submit-allowed

The submit-allowed event is broadcast when a form's submission is allowed because it is in a valid state

Name	Type	Description
data	object	Emitted data object
data.evt	event	Original event
data.formObject	object	formObject of input that event was triggered from

---

change

The change event is broadcast when a field's "change" event is triggered

Name	Type	Description
data	object	Emitted data object
data.evt	event	Original event
data.formObject	object	formObject of input that event was triggered from

---

input

The input event is broadcast when a field's "input" event is triggered

Name	Type	Description
data	object	Emitted data object
data.evt	event	Original event
data.formObject	object	formObject of input that event was triggered from

---

form-validated

The form-validated event is broadcast when a form's validity state changes from invalid to valid

Name	Type	Description
data	object	Emitted data object
data.evt	event	Original event
data.formObject	object	formObject of input that event was triggered from

---

form-invalidated

The form-invalidated event is broadcast when a form's validity state changes from valid to invalid

Name	Type	Description
data	object	Emitted data object
data.evt	event	Original event
data.formObject	object	formObject of input that event was triggered from

---

field-validated

The field-validated event is broadcast when a field's validity state changes from invalid to valid

Name	Type	Description
data	object	Emitted data object
data.evt	event	Original event
data.formObject	object	formObject of input that event was triggered from

---

field-invalidated

The field-invalidated event is broadcast when a field's validity state changes from valid to invalid

Name	Type	Description
data	object	Emitted data object
data.evt	event	Original event
data.formObject	object	formObject of input that event was triggered from