Do a js function before the page loads.

[DeathStar]

Hello.

I need a way, in php to automatically run a js function when the page is entered.

I cannot use onload, because I need it to run be fore anything loads.

 

Any ideas?

[king arthur]

JS is a client side language - it runs in the browser, so the page has to load for the browser to be able to parse it. What is it you're trying to do?

[DeathStar]

Well, I have been trying to make an ajax loading screen, I have it working, just not automatticly loading.

I got it closing, Just need it to load.

Here is the ajax(its from a tutorial, then edited):

var LoadingScreen = {

hide: function() {
	var div = document.getElementById('loading_message');
	if (div == null || div == '' || typeof(div) != 'object') { return false; }

	document.body.removeChild(div);
},

moving_dots: function() {
	var div = document.getElementById('loading_message');
	if (div == null || div == '' || typeof(div) != 'object') { return false; }

	var html = div.innerHTML;

	// Add dot or start over?
	var num_dots = html.split('.').length-1;
	if (num_dots > 6) {
		div.innerHTML = '<b>Please wait.</b><br />Loading';
	} else {
		div.innerHTML = html + '.';
	}

},


set_position: function () {
	var div = document.getElementById('loading_message');
	if (div == null || div == '' || typeof(div) != 'object') { return false; }

	var scrollTop = LoadingScreen.f_scrollTop();
	var scrollLeft = LoadingScreen.f_scrollLeft();
	var clientWidth = LoadingScreen.f_clientWidth();

	// Calculate left position
	var left = clientWidth - div.offsetWidth;
	left = scrollLeft + left;

	// Set position
	div.style.position = 'absolute';
	div.style.left = left + 'px';
	div.style.top = scrollTop + 'px';
},

create_div: function () {
	var div = document.createElement('DIV');
	div.id = 'loading_message';

	div.innerHTML = '<b>Please wait.</b><br />Loading';

	var css = "border: 1px solid black;"
	css += "font-size: 10px;"
	css += "font-family: Tahoma;"
	css += "width: 100px;";
	css += "padding: 10px;";
	css += "background-color: #FFFFFF;";
	css += "color: black;";
	css += "font-weight: none;";

	div.style.cssText = css;

	document.body.appendChild(div);

	return div;
},

f_clientWidth: function () {
	return this.f_filterResults (
		window.innerWidth ? window.innerWidth : 0,
		document.documentElement ? document.documentElement.clientWidth : 0,
		document.body ? document.body.clientWidth : 0
	);
},

f_scrollLeft: function () {
	return this.f_filterResults (
		window.pageXOffset ? window.pageXOffset : 0,
		document.documentElement ? document.documentElement.scrollLeft : 0,
		document.body ? document.body.scrollLeft : 0
	);
},

f_scrollTop: function () {
	return this.f_filterResults (
		window.pageYOffset ? window.pageYOffset : 0,
		document.documentElement ? document.documentElement.scrollTop : 0,
		document.body ? document.body.scrollTop : 0
	);
},

f_filterResults: function (n_win, n_docel, n_body) {
	var n_result = n_win ? n_win : 0;
	if (n_docel && (!n_result || (n_result > n_docel)))
	n_result = n_docel;
	return n_body && (!n_result || (n_result > n_body)) ? n_body : n_result;
},

addEventHandler: function (oTarget, sEventType, fnHandler) {
	if (oTarget.addEventListener) {
		oTarget.addEventListener(sEventType, fnHandler, false);
	} else if (oTarget.attachEvent) {
		oTarget.attachEvent("on" + sEventType, fnHandler);
	} else {
		oTarget["on" + sEventType] = fnHandler;
	} 
}

}
function load_show(){
	// Create Loading div
	LoadingScreen.create_div();

	// Set initial position				
	LoadingScreen.set_position();

	// Attach event handler to onScroll to keep in position
	LoadingScreen.addEventHandler(window, 'scroll', LoadingScreen.set_position);

	// Start the moving dots
	setInterval(LoadingScreen.moving_dots, 500);
}

 

To start I use the load_show() function.

To hide, LoadingScreen.hide()

[mainewoods]

hide: function() {
	var div = document.getElementById('loading_message');

any js that uses getElementById()  has to wait for page load because the dom element it is trying to access will not exist until the page is parsed.  Trying to access a dom element before it exists will result in a js error