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<input type='file' onchange="previewImage(this, 'preview-image');" />
<img id="preview-image" src="http://placehold.it/300" alt="image preview" />

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<div>
    <input type='file'/>
    <span id='val'></span>
    <span id='button'>Select File</span>
</div>   

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• https://snazzymaps.com/
• https://leafletjs.com/

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/** Cambia de cabecera */
var trasweb =  {};

trasweb.cabecera = function(slayer){
    this.ALTURA_HACER_FLOTANTE_MENU = 400;
    this.cabecera =  document.getElementById(slayer);


     this.getScroll = function () {

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trasweb.orientationchange = function() {
    if(-90 === window.orientation || 90 === window.orientation ) {
        alert("Landscape");
    }else {
        alert("portrait");
    }
};

window.addEventListener('orientationchange', function() { trasweb.orientationchange(); } );
trasweb.orientationchange();

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jQuery(document).ready(function($){
  
 nsZoomZoom(); 
  
 $( window ).resize(function() { 
   nsZoomZoom();
 });
  
  
 function nsZoomZoom() {

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/**
Alternativa de menos de 1kb: https://apoorv.pro/lozad.js/demo/
*/

document.addEventListener('DOMContentLoaded', function () {
    var bLazy = new Blazy({
        src: 'data-src',
        selector: '*[data-src]',
        offset: 500,
        breakpoints: [

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/** Basado en: https://stackoverflow.com/questions/15040408/achieving-min-width-with-viewport-meta-tag */

document.addEventListener('DOMContentLoaded', function () {
    trasweb.orientationchange();
});
trasweb.orientationchange = function (force_orientation) {

    var vp = document.getElementById('viewport');
    var orientation = window.orientation;
    var is_desktop = document.body.classList.contains('desktop');

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trasweb.getPosition = function (el) {
    var xPos = 0;
    var yPos = 0;

    while (el) {
        if (el.tagName === "BODY") {
            // deal with browser quirks with body/window/document and page scroll
            var xScroll = el.scrollLeft || document.documentElement.scrollLeft;
            var yScroll = el.scrollTop || document.documentElement.scrollTop;

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trasweb = trasweb | {};

trasweb.getSize = function () {
    var w = window,
        d = document,
        e = d.documentElement,
        g = d.getElementsByTagName('body')[0],
        x = w.innerWidth || e.clientWidth || g.clientWidth,
        y = w.innerHeight || e.clientHeight || g.clientHeight;