Descarga contenido exclusivo en
Ofimática y Programación + Tecnología

viernes, 25 de diciembre de 2015



Sencillo efecto lupa con jQuery+HTML+CSS (sin plugins)


Código.gs function doGet () { var html = HtmlService.createTemplateFromFile ( " page " ). evaluate () ; html.s... thumbnail 1 summary




Código.gs

function doGet() {
  var html = HtmlService.createTemplateFromFile("page").evaluate();
  html.setTitle("Lupa");
  return html;
}

function include(filename) {
  return HtmlService.createHtmlOutputFromFile(filename)
      .setSandboxMode(HtmlService.SandboxMode.IFRAME)
      .getContent();
}




page.html

<?!= include('css'); ?>
<?!= include('js'); ?>


<!-- Lets make a simple image magnifier -->
<div class="magnify">
 
 <!-- This is the magnifying glass which will contain the original/large version -->
 <div class="large"></div>
 
 <!-- This is the small image -->
 <img class="small" src="http://drive.google.com/uc?export=view&id=0B1SOjZgUAnEMa3JPb2hJUlY3V2s" width="480" height="260"/>
 
</div>




css.html

<style>
/*Some CSS*/
* {margin: 0; padding: 0;}
.magnify {width: 480px; margin: 50px auto; position: relative;}

/*Lets create the magnifying glass*/
.large {
 width: 200px; height: 200px;
 position: absolute;
 /*border-radius: 100%;************************COLOCAR ESTA LINEA PARA LUPA REDONDA*************************/
 
 /*Multiple box shadows to achieve the glass effect*/
 box-shadow: 0 0 0 7px rgba(255, 255, 255, 0.85), 
 0 0 7px 7px rgba(0, 0, 0, 0.25), 
 inset 0 0 40px 2px rgba(0, 0, 0, 0.25);
 
 /*Lets load up the large image first*/
 background: url('http://drive.google.com/uc?export=view&id=0B1SOjZgUAnEMa3JPb2hJUlY3V2s') no-repeat;
 
 /*hide the glass by default*/
 display: none;
}

/*To solve overlap bug at the edges during magnification*/
.small { display: block; }
</style>




js.html

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.9.1/jquery-ui.min.js"></script>

<script>
$(document).ready(function(){

 var native_width = 0;
 var native_height = 0;

 //Now the mousemove function
 $(".magnify").mousemove(function(e){
  //When the user hovers on the image, the script will first calculate
  //the native dimensions if they don't exist. Only after the native dimensions
  //are available, the script will show the zoomed version.
  if(!native_width && !native_height)
  {
   //This will create a new image object with the same image as that in .small
   //We cannot directly get the dimensions from .small because of the 
   //width specified to 200px in the html. To get the actual dimensions we have
   //created this image object.
   var image_object = new Image();
   image_object.src = $(".small").attr("src");
   
   //This code is wrapped in the .load function which is important.
   //width and height of the object would return 0 if accessed before 
   //the image gets loaded.
   native_width = image_object.width;
   native_height = image_object.height;
  }
  else
  {
   //x/y coordinates of the mouse
   //This is the position of .magnify with respect to the document.
   var magnify_offset = $(this).offset();
   //We will deduct the positions of .magnify from the mouse positions with
   //respect to the document to get the mouse positions with respect to the 
   //container(.magnify)
   var mx = e.pageX - magnify_offset.left;
   var my = e.pageY - magnify_offset.top;
   
   //Finally the code to fade out the glass if the mouse is outside the container
   if(mx < $(this).width() && my < $(this).height() && mx > 0 && my > 0)
   {
    $(".large").fadeIn(100);
   }
   else
   {
    $(".large").fadeOut(100);
   }
   if($(".large").is(":visible"))
   {
    //The background position of .large will be changed according to the position
    //of the mouse over the .small image. So we will get the ratio of the pixel
    //under the mouse pointer with respect to the image and use that to position the 
    //large image inside the magnifying glass
    var rx = Math.round(mx/$(".small").width()*native_width - $(".large").width()/2)*-1;
    var ry = Math.round(my/$(".small").height()*native_height - $(".large").height()/2)*-1;
    var bgp = rx + "px " + ry + "px";
    
    //Time to move the magnifying glass with the mouse
    var px = mx - $(".large").width()/2;
    var py = my - $(".large").height()/2;
    //Now the glass moves with the mouse
    //The logic is to deduct half of the glass's width and height from the 
    //mouse coordinates to place it with its center at the mouse coordinates
    
    //If you hover on the image now, you should see the magnifying glass in action
    $(".large").css({left: px, top: py, backgroundPosition: bgp});
   }
  }
 })
})
</script>


Funciona a la perfección en GHS. Cortesía de http://thecodeplayer.com/



Video del ejemplo
***Enlace para obtener copia del proyecto con el código ejemplo en descripción del video***






4 comentarios

  1. Perdona mi ignorancia
    Pero que es el gs
    ???

    ResponderEliminar
    Respuestas
    1. El gs es desde donde lanzas la aplicación web. La aplicación se aloja en los servidores de Google.

      El gs también te ayuda a hacer la conexión que te permite usar una hoja de cálculo de Google como base de datos. Podes también reconocer el nombre de la cuenta de correo, redactar y enviar correos sin entrar a gmail, etc.

      Eliminar
  2. Buenos días tengo una duda, podría usted ayudarme via chat o e-mail?

    ResponderEliminar
    Respuestas
    1. Puedes escribirme al correo y te ayudo en lo que pueda miweb.ds@gmail.com

      Eliminar