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PropForms is simple to install, just run one of the following commands:
npm install propforms | yarn add propforms


To get started you will need to import PropForms into your .js file with the following import statement:
import { PropForms } from "propforms"


To initialise PropForms on a form simply do the following:
const form = document.getElementById("my-form")
const instance = new PropForms(form)
Note: By default PropForms will attempt to validate all form elements marked with the required html attribute on submission.


There are a number of custom types used in PropForms, they're documented here and referenced to throughout this readme file.


    code: number
    method: () => boolean    


interface {
    (form: HTMLFormElement, options: Options, validation: PropFormsValidation)
    send(): void   


    code: number
    field?: HTMLTextAreaElement | ?HTMLInputElement | ?HTMLTextAreaElement
    fields?: NodeList<HTMLElement>
    name: string
    message: string
    type: string
    passing: boolean


    form: HTMLFormElement
    message: string


    field: ?HTMLTextAreaElement | ?HTMLInputElement | ?HTMLTextAreaElement
    fields: ?NodeList<HTMLElement>
    parent: ?Element
    name: string


PropForms also accepts a number of options for a second parameter, they are, with their default values as follows:
const options = {
    parent: undefined,
    errorClass: "propforms--error",
    minLengths: {
        text: 2,
        email: 6,
        tel: 6,
        password: 6
    messages: {
        0: "Please fill out this field correctly",
        1: "Please enter at least {n} characters",
        2: "Please enter a valid email address",
        3: "Please check this box to continue",
        4: "Please select at least one option",
        5: "Please select an option",
        6: "Server validation error",
        success: "Thank you, we will be in touch soon."
    validation: {},
    ajax: PropForms_ajax

parent: string

The parent option is an optional css class which will also get the error classes applied to it if the form errors.
parent: "myParent--class"

errorClass: string

The errorClass option denotes the css class that will be added onto the required field if validation fails.
errorClass: "myError--class"

minLengths: { [key: string]: number }

The key in this object refers to the input type and the value is the minimum length the value in the field needs to be before it passes validation.
minLengths: {
    file: 1

messages: { [key: string | number]: string }

When an error event is thrown then it will have a corresponding error code, this option allows you to configure the messages that are shown for each error code, this option works in conjunction with the validation option to provide custom validation. Example:
messages: {
    0: "You should really fill this field out correctly..."

validation: { [key: string]: Validation }

The validation object allows you to pass through custom validation methods for any custom validation you wish to do that isn't supported out the box.
Note: The key of your Validation object references the field name
validation: {
    postcode: {
        code: 10,
        method: function() => {
            return isNear(this.value)
The above example will pass the value of the input with the name postcode to the isNear function, which will return either true or false. The this keyword refers to the input element.

ajax: Ajax | null

Setting the ajax option to null will disable Ajax functionality, if you wish to do your own Ajax implementation then you will need to create a class that implements the Ajax interface documented under Types. Passing your own implementation to this option is fairly experimental, use with caution.


In addition to the the options you can also customise PropForms by listening for events on the html form element. A number of events are fired throughout the lifecycle of the class, they are all documented below.
Supported Events: error, fielderror, fieldvalid, success, send
Events are easily added to the form in the following manner:
const form = document.getElementById("my-form")
const instance = new PropForms(form)

form.addEventListener("fielderror", e => {
The event object emitted when the event is fired contains additional information under the detail property.

error: Error

The error event will fire if the form errors for any reason.
Note: e.detail contains an Error type.

fielderror: Error

The fielderror event will fire for each individual field that has encountered an error.
Note: e.detail contains an Error type.

fieldvalid: Valid

The fieldvalid event will fire for each individual field that passes validation.
Note: e.detail contains an Valid type.

success: Success

The success event will fire after the form has received a success message from the server.
Note: e.detail contains an Success type.

Public Methods

PropForms has a number of public methods you can call do interact with it programmatically. All of the methods can be invoked in the following manner:
const form = document.getElementById("my-form")
const instance = new PropForms(form)




Enable will enable the form if it is disabled, an enabled form functions are normal.


This method will disabled the form, a disabled form has a reduced opacity and will not be interactive.

getErrors(): Errors

This method will return all the errors PropForms currently has.


This will submit the form for you.


Validate the form.

setAjax(enabled: boolean = true)

Enables/disables ajax depending on the value passed.