Nietzsche's Preposterous Moustache


    1.0.8 • Public • Published

    Coffeekraken s-validator-component

    Provide a nice and easy way to attach some validation rules to any particular form elements and decide how the reply messages will be displayed.

    View demo


    • A bunch of pre-made validators like (required, min, max, range, maxlength, pattern, number, integer, color, email and url)
    • Easy to register new validators
    • Easy to translate the validators messages
    • Handle checkboxes and radios validations
    • Easy to customize how errors are displayed (even by validators types)
    • Hook the form checkValidity method to reflect the validations
    • And more...

    Table of content

    1. Demo
    2. Install
    3. Get Started
    4. Styling your validators
    5. Register a new validator
    6. The apply functions
    7. Javascript API
    8. Sugar Web Components Documentation
    9. Browsers support
    10. Contribute
    11. Who are Coffeekraken?
    12. Licence


    npm install coffeekraken-s-validator-component --save

    Get Started

    First, import the component into your javascript file like so:

    import SValidatorComponent from 'coffeekraken-s-validator-component'

    Then simply use it inside your html like so:

    <input type="text" name="url" />
    <s-validator for="url" url required></s-validator>
    <input type="text" name="range" />
    <s-validator for="range" min="10" max="20" required></s-validator>
    <!-- grab standard HTML validators from the target -->
    <input type="color" name="color" required />
    <s-validator for="color"></s-validator>

    THe s-validator component will grab the standards HTML validators from the target like min, max, type="email", type="number", type="integer", type="url", type="color", required, maxlength and pattern

    Styling your validators

    Styling your validators become very simple. To help you style it depending on his state, some attributes will be present or not on the component itself as well as on the inputs that he handle. Here's the list:

    On the component itself

    • attribute active when an error message has to be displayed

    On the inputs elements

    • attribute invalid when the input is invalid
    • attribute valid when the input is valid
    • attribute dirty when the input has been touched by the user

    Usage example

    Here's how to apply a very simple styling to your validators

    // styling the validator itself 
    s-validator {
        &[active] {
    // styling the inputs 
    input {
        border:1px solid grey;
        &[dirty][valid] {
            border-color: green;
        &[dirty][invalid] {
            border-color: red;

    Register a new validator

    To register a custom validator, you just need to use the registerValidator method.

    // import the component
    import SValidatorComponent from 'coffeekraken-s-validator-component'
    // register a new validator
    SValidatorComponent.registerValidator('my-cool-validator', {
        validate: (targetFormElms, arg1, arg2) => {
            // validate the form elms passed
            // this function has to return either true if valid and false if not
            return true
        message: 'This field need to be cool like %s',
        processMessage:  (message, arg1, arg2) => {
            // return the actual message to put in the validation component
            // for example, replace a token like : The field need to be lower than %s
            // by using a replace like :
            return message.replace('%s', arg1);

    The validate and message function takes each at least 1 argument. The targetFormElms for the validate one, and the corresponding raw validator message for the message one. The other arguments are optional but are passed by following this pattern:


    In case of a validator that need two parameters like a range type of one, it will be used like so:

    <s-validator my-range="4:10" for="..."></s-validator>

    The range parameter will be splited by the : separator and two additional parameters will be passed to the validate and message function like so:

    SValidatorComponent.registerValidator('my-range', {
        validate: function(targetFormElms, min, max) {
            // this = the component instance
            // min will correspond to 4
            // max will correspond to 10
            // we know that we have only 1 element in the targetFormElms stack
            const value = parseFloat(targetFormElms[0].value);
            return value >= min && value <= max;
        message: 'The value has to be between %min and %max',
        processMessage: function(message, min, max) {
            // this = the component instance
            return message.replace('%min', min).replace('%max',max);

    By doing this principle, your custom validators can have n parameters. It's totally up to you.

    The apply functions

    In order to display the error messages when needed, the component use the concept of apply functions.

    An apply function is just a plain javascript function that apply the error message in the html and return an unapply function that revert the apply function actions.

    The default apply function that is used by the component set the error message inside the component itself, and his unapply function just clear it with an innerHTML = ''; statement.

    If this behavior suits your need, you can stop here, but you can totally set custom apply and unapply function to each validators. Here's how to do it:

    SValidatorComponent.registerValidator('my-cool-validator', {
        // validate: function...,
        // message: 'My cool message',
        // processMessage: function...,
        apply: function(targetFormElms, message) {
            // for demo purpose, we just inject the message inside the component
            // but you can do fancy stuffs here if you want...
            this.innerHTML = message;
            // return the `unapply` function
            return () => {
                this.innerHTML = '';

    Override the default apply function

    You can as well override the default apply function like so:

        default: function(targetFormElms, message, type) {
            // type = the validator type like "required", "min", "max", "range", "my-cool-validator", etc...
            // apply the error message here...
            return () => {
                // undo here...

    Browsers support

    IE / Edge
    IE / Edge
    IE11+ last 2 versions last 2 versions last 2 versions

    As browsers are automatically updated, we will keep as reference the last two versions of each but this component can work on older ones as well.

    The webcomponent API (custom elements, shadowDOM, etc...) is not supported in some older browsers like IE10, etc... In order to make them work, you will need to integrate the corresponding polyfill.


    This is an open source project and will ever be! You are more that welcomed to contribute to his development and make it more awesome every day. To do so, you have several possibilities:

    1. Share the love ❤️
    2. Declare issues
    3. Fix issues
    4. Add features
    5. Build web component

    Who are Coffeekraken

    We try to be some cool guys that build some cool tools to make our (and yours hopefully) every day life better.

    More on who we are


    The code is available under the MIT license. This mean that you can use, modify, or do whatever you want with it. This mean also that it is shipped to you for free, so don't be a hater and if you find some issues, etc... feel free to contribute instead of sharing your frustrations on social networks like an asshole...


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