// ---------------------------------------------------------------------------------------------------
// DYNAMIC REGISTRATION OF PAGE ONLOAD EVENT HANDLER
// ---------------------------------------------------------------------------------------------------
// Author : D. Barsotti
// Date : 11.2008
// ---------------------------------------------------------------------------------------------------
//
// WARNING:
// In order to work, this script and it's call MUST BE INCLUDED IN THE BODY OF THE PAGE.
// If included and/or called from the head, the script won't work because at the time the
// head is evaluated, the body does not yet exist.
//
// Example of usage: This will register myOnLoad2 function as onload event handler for the page.
//
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var __old_onload_handler = null; //*** Save the old onload event handler
var __new_onload_handler = null; //*** The new onload event handler
//*** Register the new event handler
function setOnLoadHandler(new_handler) {
var body = document.getElementsByTagName('body')[0];
__old_onload_handler = window.onload;
__new_onload_handler = new_handler;
if (body.addEventListener) {
window.onload = __on__load__;
}
else {
body.onload = __on__load__;
}
}
//*** Internal event handler. It will call the function passed in parameter, and then call the saved onload event handler
function __on__load__() {
// Call the new event handler
if (__new_onload_handler != null) __new_onload_handler();
// Call the old event handler
if ((typeof (__old_onload_handler) != 'undefined') && (__old_onload_handler != null)) {
__old_onload_handler();
}
}