JSFiddle - React, Tailwind, and code Playground

HTML

<form id="contact_form" class="std" method="post" action="">

                    <h3>{l s='Send a message'}</h3>
                    <p class="select">
                        <label for="id_contact">{l s='Subject Heading'}</label>
                        <input type="text" id="id_contact" name="id_contact" /><sup>*</sup>
                    </p>

                    <p class="text">
                        <label for="emailc">{l s='E-mail address'}</label>
                        <input type="text" id="emailc" name="emailc" /><sup>*</sup>
                    </p>

                    <p class="text">
                        <label for="name">{l s='Name'}</label>
                        <input type="text" name="name" id="name" /><sup>*</sup>
                    </p>

                    <p class="text">
                        <label for="id_order">{l s='ID Order'}</label>
                        <input type="text" name="id_order" id="id_order" />
                    </p>
                    
                    <p class="text">
                    	<label for="fileUpload">{l s='Attach File'}</label>
                        <input type="hidden" name="MAX_FILE_SIZE" value="2000000" />
                        <input type="file" name="fileUpload" id="fileUpload" />
                    </p>
                        
                    <p class="textarea">
                        <label for="message">{l s='Message'}</label>
                         <textarea id="message" name="message" rows="15" cols="20" style="width:460px;height:220px"></textarea><sup>*</sup>
                    </p>
                    <p class="submit">
                        <input style="width:100px" type="submit" name="submitMessage" id="submitMessage" value="{l s='Send'}" class="button_mini" />
                    </p>
                    <div id="contact_msg"></div>

            </form>

JavaScript

$('#contact_form').submit(function() {
			var dataString = $(this).serialize();
			alert('Datos serializados: '+dataString); //Tengo esta alerta para verificar si recoge los datos.
            return false;
		});