keep old tiles until each new tile is loaded in Leaflet? - Javascript Leaflet

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Description

keep old tiles until each new tile is loaded in Leaflet?

Demo Code

ResultView the demo in separate window 

<html>
   <head> 
      <title>Prevent flickering on redraw</title> 
      <meta name="viewport" content="width=device-width, initial-scale=1"> 
      <link rel="stylesheet" type="text/css" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css"> 
      <script type="text/javascript" src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script> 
      <style id="compiled-css" type="text/css">

#map { height: 180px; }


      </style> 
      <script type="text/javascript">
    window.onload=function(){//from www  .  j  av  a2s .  co  m
var map = L.map('map').setView([51.505, -0.09], 13);
var layer2 = L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    attribution: 'prevent flickering',
    maxZoom: 18
}).addTo(map);
var layer = L.tileLayer('http://{s}.tiles.mapbox.com/v3/examples.map-i86knfo3/{z}/{x}/{y}.png', {
    attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery ? <a href="http://mapbox.com">Mapbox</a>',
    maxZoom: 18
}).addTo(map);
map.on('click', function(e) {
    layer2.bringToFront();
    layer.on('load', function(e) {
        console.log('loaded');
        layer.bringToFront();
    });
    layer.redraw();
});
    }

      </script> 
   </head> 
   <body> 
      <div id="map"></div>  
   </body>
</html>

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