Here is the circumstance:
I have 2 pages:
- 1 x html page
- 1 x external Javascript
Now in the html page, there will be internal Javascript coding to allow the placement of the window.onload, and other page specific methods/functions.
But, in the external Javascript I want certain things to be done before the window.onload event is triggered. This is to allow customized components to be initialized first.
Is there a way to ensure initialization to occur in the external Javascript before the window.onload event is triggered?
The reason I have asked this, is to attempt to make reusable code (build once - use all over), to which the external script must check that it is in 'order/check' before the Javascript in the main html/jsp/asp/PHP page takes over. And also I am not looking for a solution in jQuery @_@
Here are some of the links on Stack Overflow I have browsed through for a solution:
Can someone help or direct me to a solution, your help will be muchness of greatness appreciated.
[updated response - 19 November 2012]
Hi all, thanks for you advice and suggested solutions, they have all been useful in the search and testing for a viable solution.
Though I feel that I am not 100% satisfied with my own results, I know your advice and help has moved me closer to a solution, and may indeed aid others in a similar situation.
Here is what I have come up with:
test_page.html
<html>
<head>
<title></title>
<script type="text/javascript" src="loader.js"></script>
<script type="text/javascript" src="test_script_1.js"></script>
<script type="text/javascript" src="test_script_2.js"></script>
<script type="text/javascript">
window.onload = function() {
document.getElementById("div_1").innerHTML = "window.onload complete!";
}
</script>
<style type="text/css">
div {
border:thin solid #000000;
width:500px;
}
</head>
<body>
<div id="div_1"></div>
<br/><br/>
<div id="div_2"></div>
<br/><br/>
<div id="div_3"></div>
</body>
</html>
loader.js
var Loader = {
methods_arr : [],
init_Loader : new function() {
document.onreadystatechange = function(e) {
if (document.readyState == "complete") {
for (var i = 0; i < Loader.methods_arr.length; i++) {
Loader.method_arr[i]();
}
}
}
},
load : function(method) {
Loader.methods_arr.push(method);
}
}
test_script_1.js
Loader.load(function(){initTestScript1();});
function initTestScript1() {
document.getElementById("div_1").innerHTML = "Test Script 1 Initialized!";
}
test_script_2.js
Loader.load(function(){initTestScript2();});
function initTestScript2() {
document.getElementById("div_2").innerHTML = "Test Script 2 Initialized!";
}
This will ensure that scripts are invoked before invocation of the window.onload event handler, but also ensuring that the document is rendered first.
What do you think of this possible solution?
Thanking you all again for the aid and help :D
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