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class FileInputTagLib {
 	
    static namespace = 't'


    /*def assetsFileinput = {
    	 out << asset.javascript(src: "bootstrap-fileinput/js/fileinput.min.js")
       out << asset.stylesheet(src: "bootstrap-fileinput/css/fileinput.min.css")
    }*/

    /**
     * @attr name REQUIRED
     * @attr accept
     */
    def fileinput = { attrs, body ->
        def name = TagLibUtils.getRequired("name", "fileinput", attrs)
        def accept = attrs.remove('accept')
        def options = attrs.remove('options')
        
        out << g.render(template: "/taglibTemplates/fileinput", model: [])
    }

 }

<g:form action="formSubmit">
    <g:hasErrors bean="${command1}">
        <div class="alert alert-danger">
            <g:renderErrors bean="${command1}" as="list"/>
        </div>
    </g:hasErrors>


    Nombre: <g:textField name="nombre" value="${fieldValue(bean: command1, field: "nombre")}"/><br/>
    Apellido: <g:textField name="apellido" value="${fieldValue(bean: command1, field: "apellido")}"/><br/>

    <g:submitButton name="enviar"/>
</g:form>

// --------------------------------------
// Ejemplo básico de un command object
// --------------------------------------
@Secured(['permitAll'])
class TestController {

    def index() {
    }

    def formSubmit(Command1 command1) {
        if (command1.hasErrors()) {
            render view: "index", model: [command1:command1]
            return
        }
        
        render view: "index"
    }

}

@Validateable
class Command1 {
    String nombre
    String apellido

    static constraints = {
    }
}

<g:form action="formSubmit">
    <g:textField name="nombre" />

    <g:submitButton name="enviar"/>
</g:form>

<g:hasErrors bean="${command1}">
    <div class="alert alert-danger">
        <g:renderErrors bean="${command1}" as="list"/>
    </div>
</g:hasErrors>

// --------------------------------------
// Ejemplo básico
// --------------------------------------
@Secured(['permitAll'])
class TestController {

    def index() {
    }

    def formSubmit(String nombre) {
        redirect action: "index"
    }
}