Wednesday, October 21, 2009

JavaScript Wait While Loading Page Display Image

If you have a page that takes long time to display it is a good idea to display a "wait until the page loads" image. This tutorial show you how to implement this in your webpage.

Below are the steps to implement the feature:

Step 1. Every time your page loads a "init()" function will load.

<body onLoad="init()">

Step 2. Define a div named "loading" right after <body> section.

<div id="loading" style="position:absolute; width:100%; text-align:center; top:300px;">
<img src="loading.gif" border=0></div>

The loading.gif image should be an animated gif that suggests that the page is still loading.

Step 3. Place this javascript code right after you define the div.

<script>
var ld=(document.all);
var ns4=document.layers;
var ns6=document.getElementById&&!document.all;
var ie4=document.all;
if (ns4)
ld=document.loading;
else if (ns6)
ld=document.getElementById("loading").style;
else if (ie4)
ld=document.all.loading.style;
function init()
{
if(ns4){ld.visibility="hidden";}
else if (ns6||ie4) ld.display="none";
}
</script>

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