valider.js

Light and simple form and input validation package. Plain javascript lib, plug and play!

DEMO

https://dstojecki.github.io/valider.js-demo/

Instalation

Install via NPM

npm install valider.js

Usage

Then you will have to import it into your app.js file and create valider instance.

import { Valider } from  'valider.js'

const config  = {
    selector: '.my-input', // enter a selector to retrieve the inputs for validation
    addValidClass: true, // if you want to display to user that input got validate correctly
    validateOn: 'keyup' // enter an event name if you want to validate on event
}

const valider  =  new  Valider(config)

After that in your HTML file:

<div class="valider-form__group">
    <label>First name</label>
    <input data-required data-email class="my-input">
</div>
<script defer type="module" src="./app.js"></script>

In above example input will check if it's not empty and if his value matches email format.

Valider.js download all data attributes and add validation based on them.

Validators List

Name	Parameter	Description
data-required	-	Checks if input is empty
data-email	-	Checks if value matches email format
data-placeholder="First Name"	Strings	Add placeholder when hovering on input
data-minlength="7"	Number	Checks if inputs length is not lower than parameter
data-maxlength="7"	Number	Checks if inputs length is not higher than parameter
data-numberonly	-	Checks if input has only numbers
data-event="change"	String	If you want to validate particular input on diffrent event than rest of them you can provide it here. Maybe usefull with validating radios and checkboxes
data-custom=""	RegExp	Used for custom validators. To work properly you need to define custom validatio message
data-custom-err	String	Messege that will be displayed when your custom RegExp test fails.

More validators will be added soon.

Send Request

If you want you can send request using valider.js by passing props to config object :

import { Valider } from  'valider.js'

const submit = document.querySelector('.submit')

const config = {
    selector: '.my-input',
    addValidClass: true,
    request: {
	    route: 'http://127.0.0.1:8000/api/schools',
	    method: 'POST',
	}
}
const  valider  =  new  Valider(config)
submit.addEventListener('click', (e) => {
	const  respond  =  valider.send()
})

Valider.js will build request payload using name attributes in html input tag.

Validate before sending request

If you want to make only one validation before sending request just provide no event in config object and call check() function before sending request.

import { Valider } from  'valider.js'

const submit = document.querySelector('.submit')

const config = {
    selector: '.my-input',
    addValidClass: true,
}

const valider = new Valider(config)

submit.addEventListener('click', (e) => {
    e.preventDefault()
    
    if(valider.check()) {
	    console.log('Validation successfull');
	    
	    // Here you can add your request method
    }
})

Create Custom Validators

You can create your own validators based on RegExp. You need to provide RegExp inside data-custom attribute and coresponding error messega inside data-custom-err.

<div  class="valider-form__group">
    <label for="">Characters only</label>
    <input data-custom="^[a-zA-Z]+$" data-custom-err="This field should contain letters only" class="my-input">
</div>

Styles

Valider.js provides some predefined styles that can be changed to fit your layout.

.valider-error - class added to input if validation fails .valider-valid - class added to input if validation passes .error-msg - class added to error message Error message is added directly after input.

Example form

HTML

<form class="valider-form">
   <div class="valider-form__group">
	<label for="">First name</label>
	<input data-required data-minlength="3" class="my-input">
   </div>
   <div class="valider-form__group">
	<label for="">Select something</label>
	<select data-required data-event="change" class="my-input">
		<option value="" selected></option>
		<option value="Some">Some</option>
		<option value="Thing">Thing</option>
	</select>
   </div>
   <div class="valider-form__group">
	<label for="">Second name</label>
	<input data-required  data-maxlength="2"  class="my-input">
   </div>
   <div class="valider-form__group">
	<label for="">Age</label>
	<input data-required data-numberonly data-maxlength="3" class="my-input">
   </div>
   <div class="valider-form__group">
	<label for="">Are you sure?</label>
	<div>
		<input data-event="change" data-required type="checkbox" class="my-input">
		<label for="">Yes</label>
	</div>
   </div>
   <div  class="valider-form__group">
   <label for="">Are you sure radio?</label>
   <div>
	<input id="1" data-event="change" data-required type="radio" class="my-input"  name="radioGroup"  value="test1">
	<label for="1">Yes</label>
	<input id="2" data-event="change" data-required type="radio" class="my-input"  name="radioGroup"  value="tnop">
	<label for="2">No</label>
   </div>
</div>
<button class="valider-form__submit submit">Submit</button> 
</form>

app.js

import { Valider } from  'valider.js'
const  submit  =  document.querySelector('.submit')
      
const  config  = {
    selector: '.my-input',
    addValidClass: true,
    validateOn: 'keyup'
} 

const  valider  =  new  Valider(config)

submit.addEventListener('click', (e) => {
    e.preventDefault()
    if(valider.check()) {
	    console.log('Validation successfull')
    }
})