JSFiddle - React, Tailwind, and code Playground

by kspr

HTML

<script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.13.1/jquery.validate.min.js"></script>
<form method="POST" id="form-clave">
    <div class="form-group">
        <input type="text" name="clave1" id="clave1" required>
    </div>
    <div class="form-group">
        <input type="text" name="clave2" id="clave2" required>
    </div>
    <div class="form-group">
        <input type="text" name="clave3" id="clave3" required>
    </div>
    <button id="aceptar">aceptar</button>
</form>

CSS

body {
    font-family: Helvetica, Arial, sans-serif;
}
.form-group {
    margin-bottom: 40px;
    position: relative;
}

.form-group > div.error {
    background: #c62828;
    border-radius: 4px;
    color: white;
    padding: 10px;
    position: absolute;
    top: 20px;
}

.form-group > div.error:after {
    right: 100%;
    top: 18px;
    border: solid transparent;
    content: " ";
    height: 0;
    width: 0;
    position: absolute;
    pointer-events: none;
    border-color: rgba(198, 40, 40, 0);
    border-right-color: #c62828;
    border-width: 10px;
    margin-top: -10px;
}

JavaScript

$('#form-clave').validate({
    rules: {
        clave3: {
            required: true,
            equalTo: '#clave2'
        }
    },
    messages: {
        clave3: {
            required: "Complete este campo",
            equalTo: "Debe coincidir con la nueva clave"
        }
    },
    errorElement: 'div',
    errorPlacement: function(error, input) {
        $(error).css({
            'left': input.outerWidth(true) + 20,
            'top': 0
        });

        input.parent().append(error);
    }
});

$('#aceptar').on('click', function(e) {

    e.preventDefault();

    if ($('#form-clave').valid() == true)
        alert('el formulario es válido!');

});