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A Pen By Captain Anonymous

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              <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<form onsubmit="return validar();" id="formValidar" method="post">

<input type="text" name="campo1" placeholder="Campo 1...">
<input type="text" name="campo2" placeholder="Campo 2...">
<textarea name="campo3" placeholder="Campo 3..."></textarea>
<div id="res"></div>
<input type="submit" value="Enviar">

              function validar(){
	//Serializamos todos los campos del form dinámicamente
	var campos= $('#formValidar').serializeArray();
	//Por defecto la validación es 1
	var validar=1;
	//Recorremos todos los campos del formulario
	$.each(campos, function(index, value) {
		//Si uno de los valores esta vacio pasamos la validación a 0
		if(value.value=='') validar=0;

	//Si la validación es 0 no enviamos el form y mostramos un mensaje
		$('#res').text('Completa todos los campos');
	     return false;	
	} else {
	//Si la validación es 1  enviamos el form
		return true;

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