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Modernizr: Un librería de detección de HTML5

26Nov
en CSS 3, Desarrollo web, Herramientas, HTML5, Tutoriales

modernizrModernizr es una librería javascript Open Source que permite detectar el soporte de los navegadores para características de HTML5 y CSS3. De esta manera los desarrolladores podemos tomar decisiones en nuestras aplicaciones a la hora de mostrar contenido a los usuarios.
Por ejemplo, si queremos incluir un video en la página utilizando la etiqueta video, deberíamos conocer primero si el navegador soporta esta etiqueta.
Incluimos la librería en nuestro sitio:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Ejemplo</title>
    <script src="modernizr.js"></script>
    <script src="script.js"></script>
</head>

Preguntamos de la siguiente manera en nuestro script:

If(Modernizr.video){
    Console.log(“video soportado”);
} else {
        Console.log(“video NO soportado”);
}

Para utilizarlo con CSS3 primero debemos conocer clases que se crean dentro de la etiqueta html al cargarse la página:

<html class="js flexbox flexboxlegacy canvas canvastext webgl no-touch geolocation postmessage websqldatabase indexeddb hashchange history draganddrop websockets rgba hsla multiplebgs backgroundsize borderimage borderradius boxshadow textshadow opacity cssanimations csscolumns cssgradients cssreflections csstransforms csstransforms3d csstransitions fontface generatedcontent video audio localstorage sessionstorage webworkers applicationcache svg inlinesvg smil svgclippaths bgsizecover boxsizing">

Esto permite utilizar selectores descendientes para apuntar a un elemento basado en el soporte del navegador de alguna característica.

Es decir, si queremos que el elemento con id #test tenga un background con degradado, crearemos dos estilos CSS, uno usando la propiedad gradient de CSS3 por si el navegador lo soporta, y otro con una imagen en caso de que el navegador no soporte gradiend. El código quedaría así.

.cssgradients #test {
    background-image:
    -moz-linear-gradient(0% 0% 270deg,
    rgba(0,0,0,0.4) 0,
    rgba(0,0,0,0) 37%,
    rgba(0,0,0,0) 83%,
    rgba(0,0,0,0.06) 92%,
    rgba(0,0,0,0) 98%);
}
.no-cssgradients #test {
    background-image:
    url(../images/put_a_replacement_img_here.png);
}

Las clases que se utilizan son las mismas que aparecen en el atributo class de html, en caso de que no sea soportada se le agrega el prefijo no-.

Aquí les va el código del mdernizr.js

/* Modernizr 2.7.0 (Custom Build) | MIT & BSD
 * Build: https://modernizr.com/download/#-fontface-backgroundsize-borderimage-borderradius-boxshadow-flexbox-flexboxlegacy-hsla-multiplebgs-opacity-rgba-textshadow-cssanimations-csscolumns-generatedcontent-cssgradients-cssreflections-csstransforms-csstransforms3d-csstransitions-applicationcache-canvas-canvastext-draganddrop-hashchange-history-audio-video-indexeddb-input-inputtypes-localstorage-postmessage-sessionstorage-websockets-websqldatabase-webworkers-geolocation-inlinesvg-smil-svg-svgclippaths-touch-webgl-shiv-cssclasses-teststyles-testprop-testallprops-hasevent-prefixes-domprefixes-css_backgroundsizecover-css_boxsizing-load
 */
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6 Comentarios

  1. zico dice:

    Muy interesante, si pudieran poner en vez del código el archivo sería más fácil para los usuarios descargar y utilizar esta biblioteca.

  2. @abs: si puedes averigua sobre nodewebkit, es una nueva plataforma que puedes usar node.js dentro de HTML5 sin ningun problema, por ejemplo, puedes hacer cosas como esta:

    var io = require(‘socket.io’).listen(80);
    io.sockets.on(‘connection’, function (socket) {
    socket.emit(‘news’, { hello: ‘world’ });
    socket.on(‘my other event’, function (data) {
    console.log(data);
    });
    });

    Para comenzar puedes buscar en Github, te lo voy a agradecer veras que es super interesante.

    Salu2s Viejos colegas

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