JSFiddle - React, Tailwind, and code Playground

by xristo91

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.2.0/knockout-min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout-validation/2.0.2/knockout.validation.min.js"></script>
<fieldset>    
    <div class="row" data-bind="validationElement: firstName">
        <label>First name:</label>
        <input type="text" data-bind="textInput: firstName"/>
    </div>
    
    <div class="row" data-bind="validationElement: lastName">
        <label>Last name:</label>
        <input data-bind="value: lastName"/>
    </div>
    
    <div class="row">
        <div class="row">
            <label>Age:</label>
            <input data-bind="value: age" required="required"/>
        </div>
    </div>
</fieldset>

<fieldset>
    <button type="button" data-bind='click: submit'>Submit</button>
    &nbsp;
</fieldset>

CSS

.wrong-field input {
  border:1px solid red;
}

/*-----------------------------------------------------------------*/
@import url(https://fonts.googleapis.com/css?family=Open+Sans:700,400);
body {padding: 10px 0;font-family: 'Open Sans', sans-serif;font-weight: 400;font-size: 14px;}
fieldset {padding: 10px;}
strong {font-weight: 700;}
label {display:inline-block;width: 120px;}
button {padding: 3px 6px;}
input, select {width: 180px; padding: 3px 6px; border-radius: 3px;border: 1px solid #ccc;outline: none;margin-right: 5px;transition: .3s all ease-in-out;}
select {width:194px;}
input:focus {border: 1px solid #5579A9;box-shadow: 0px 0px 4px 0px #6FA5ED;}
.row {margin-bottom: 5px;}
.well {border:1px solid #ccc;border-radius: 3px;background-color:#efefef;box-sizing:border-box; width:100%;padding:10px;}

JavaScript

ko.validation.init({
    insertMessages:false,
    messagesOnModified:false,
    decorateElement: true,
    errorElementClass: 'wrong-field'
}, true);

var viewModel = {
    firstName: ko.observable().extend({minLength: 2, maxLength: 10}),
    lastName: ko.observable().extend({required: true}),
    age: ko.observable().extend({min: 1, max: 100}),
    submit: function() {
        if (viewModel.errors().length === 0) {
            alert('Thank you.');
        }
        else {
            alert('Please check your submission.');
            viewModel.errors.showAllMessages();
        }
    },
};

viewModel.errors = ko.validation.group(viewModel);

ko.applyBindings(viewModel);