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form-validity-state

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form-validity-state

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

  • 1.0.0
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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

ParamTypeDefaultDescription
options.invalidClassstring"invalid"Class to be applied to invalid forms and inputs
options.selectorstring"form[data-validation-state]"Selector used to query participating form elements
options.autoInitializebooleantrueDom 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

NameTypeDescription
dataobjectEmitted data object
data.evteventOriginal event
data.formObjectobjectformObject 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

NameTypeDescription
dataobjectEmitted data object
data.evteventOriginal event
data.formObjectobjectformObject 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

NameTypeDescription
dataobjectEmitted data object
data.evteventOriginal event
data.formObjectobjectformObject of input that event was triggered from
change

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

NameTypeDescription
dataobjectEmitted data object
data.evteventOriginal event
data.formObjectobjectformObject of input that event was triggered from
input

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

NameTypeDescription
dataobjectEmitted data object
data.evteventOriginal event
data.formObjectobjectformObject 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

NameTypeDescription
dataobjectEmitted data object
data.evteventOriginal event
data.formObjectobjectformObject 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

NameTypeDescription
dataobjectEmitted data object
data.evteventOriginal event
data.formObjectobjectformObject 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

NameTypeDescription
dataobjectEmitted data object
data.evteventOriginal event
data.formObjectobjectformObject 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

NameTypeDescription
dataobjectEmitted data object
data.evteventOriginal event
data.formObjectobjectformObject of input that event was triggered from

FAQs

Package last updated on 14 Jun 2017

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