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javascript onload

Posted on 2011-09-02
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Last Modified: 2012-08-13
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="http://maps.google.com/maps?file=api&amp;v=2&amp;sensor=false&amp;key=ABQIAAAAJxYcItOgkqR8R_oLqIOOTBQacz0bPLQUXEQFHZqrZvMEpHZ5XRSCJ0pmFLc3gNPINynksheGWBUQdg" 
type="text/javascript"></script>
<script type="text/javascript">
function initialize(from, to) {
	if (GBrowserIsCompatible()) {    
	  	map = new GMap2(document.getElementById("map_canvas"));
	  	gdir = new GDirections(map, document.getElementById("directions"));
	  	GEvent.addListener(gdir, "load", onGDirectionsLoad);
	  	GEvent.addListener(gdir, "error", handleErrors);
	  	setDirections(from, to, "en_US");
	}
} 
</script>
</head>

<body onload="initialize('fromaddress','toaddress')" onunload="GUnload()" >
<div id="map_canvas" style="width: 500px; height: 400px"></div>

<input type="hidden" name="fromaddress" value="100 Main Street. Los Angeles, CA 90032" />
<input type="hidden" name="toaddress" value="200 Main Street. Los Angeles, CA 90032" />



</body>
</html>

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I have attached codes in html/javascript.
How can I load both hidden value to Onload event in Javascript.
Assume  both hidden fields already have value there .

Thank
0
Comment
Question by:Webboy2008
  • 2
3 Comments
 
LVL 10

Expert Comment

by:Gregg
ID: 36476514
Are you trying to set the value of the hidden form fields? And run the initialize function during the window onload event? If so please see attached sample.

You will need to uncomment the initialize function and delete the alert. Hope this helps.

Javascript file

//**************************************
//Window Load 
//**************************************

/* put all onload functions and code here.*/
addEvent(window, "load", function() {
	//Set To Address
	var from = document.getElementById("fromaddress");
	from.value="100 Main Street. Los Angeles, CA 90032";
	
	//Set From Address
	var to = document.getElementById("toaddress")
	to.value="200 Main Street. Los Angeles, CA 90032";
	
	//initialize method call.
	//initialize(from,to);
	
	alert(to.value);
});

//**************************************
//Window Load 
//**************************************
function initialize(from, to) {
	if (GBrowserIsCompatible()) {    
	  	map = new GMap2(document.getElementById("map_canvas"));
	  	gdir = new GDirections(map, document.getElementById("directions"));
	  	GEvent.addListener(gdir, "load", onGDirectionsLoad);
	  	GEvent.addListener(gdir, "error", handleErrors);
	  	setDirections(from, to, "en_US");
	}
} 


//********************************
//Event Handlers
//********************************
// bind the event handlers
function addEvent(elem, evtType, func) {
	if (elem.addEventListener) {
		elem.addEventListener(evtType, func, false);
	}
	else if (elem.attachEvent) {
		elem.attachEvent("on" + evtType, func);
	}
	else {
		elem["on" + evtType] = func;
	}
}

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Html file

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script src="http://maps.google.com/maps?file=api&amp;v=2&amp;sensor=false&amp;key=ABQIAAAAJxYcItOgkqR8R_oLqIOOTBQacz0bPLQUXEQFHZqrZvMEpHZ5XRSCJ0pmFLc3gNPINynksheGWBUQdg" type="text/javascript"></script>
<script src="test.js" type="text/javascript"></script>

</head>

<body>
<div id="map_canvas" style="width: 500px; height: 400px"></div>

<input type="hidden" name="fromaddress" value="" id="fromaddress"/>
<input type="hidden" name="toaddress" value="" id="toaddress" />


</body>
</html>

Open in new window

test.html
test.js
0
 
LVL 10

Expert Comment

by:Gregg
ID: 36476515
Are you trying to set the value of the hidden form fields? And run the initialize function during the window onload event? If so please see attached sample.

You will need to uncomment the initialize function and delete the alert. Hope this helps.

Javascript file

//**************************************
//Window Load 
//**************************************

/* put all onload functions and code here.*/
addEvent(window, "load", function() {
	//Set To Address
	var from = document.getElementById("fromaddress");
	from.value="100 Main Street. Los Angeles, CA 90032";
	
	//Set From Address
	var to = document.getElementById("toaddress")
	to.value="200 Main Street. Los Angeles, CA 90032";
	
	//initialize method call.
	//initialize(from,to);
	
	alert(to.value);
});

//**************************************
//Window Load 
//**************************************
function initialize(from, to) {
	if (GBrowserIsCompatible()) {    
	  	map = new GMap2(document.getElementById("map_canvas"));
	  	gdir = new GDirections(map, document.getElementById("directions"));
	  	GEvent.addListener(gdir, "load", onGDirectionsLoad);
	  	GEvent.addListener(gdir, "error", handleErrors);
	  	setDirections(from, to, "en_US");
	}
} 


//********************************
//Event Handlers
//********************************
// bind the event handlers
function addEvent(elem, evtType, func) {
	if (elem.addEventListener) {
		elem.addEventListener(evtType, func, false);
	}
	else if (elem.attachEvent) {
		elem.attachEvent("on" + evtType, func);
	}
	else {
		elem["on" + evtType] = func;
	}
}

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Html file

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script src="http://maps.google.com/maps?file=api&amp;v=2&amp;sensor=false&amp;key=ABQIAAAAJxYcItOgkqR8R_oLqIOOTBQacz0bPLQUXEQFHZqrZvMEpHZ5XRSCJ0pmFLc3gNPINynksheGWBUQdg" type="text/javascript"></script>
<script src="test.js" type="text/javascript"></script>

</head>

<body>
<div id="map_canvas" style="width: 500px; height: 400px"></div>

<input type="hidden" name="fromaddress" value="" id="fromaddress"/>
<input type="hidden" name="toaddress" value="" id="toaddress" />


</body>
</html>

Open in new window

0
 
LVL 10

Accepted Solution

by:
P1ST0LPETE earned 2000 total points
ID: 36476983
You should be focusing on writing unobtrusive javascript (i.e. separating your javascript from your html).
To do that requires a simple change, which is using the window.onload event instead of <body onload="">

Applying this to your page should give you something that looks like this:
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script src="http://maps.google.com/maps?file=api&amp;v=2&amp;sensor=false&amp;key=ABQIAAAAJxYcItOgkqR8R_oLqIOOTBQacz0bPLQUXEQFHZqrZvMEpHZ5XRSCJ0pmFLc3gNPINynksheGWBUQdg" type="text/javascript"></script>
<script type="text/javascript">
window.onload = function() {
    var from = document.getElementByName('fromaddress').value;
    var to = document.getElementByName('toaddress').value;
    initialize(from, to);
}

window.onunload = function() {
    GUnload();
}

function initialize(from, to) {
	if (GBrowserIsCompatible()) {    
	  	map = new GMap2(document.getElementById("map_canvas"));
	  	gdir = new GDirections(map, document.getElementById("directions"));
	  	GEvent.addListener(gdir, "load", onGDirectionsLoad);
	  	GEvent.addListener(gdir, "error", handleErrors);
	  	setDirections(from, to, "en_US");
	}
} 
</script>
</head>

<body>
    <div id="map_canvas" style="width: 500px; height: 400px"></div>
    <input type="hidden" name="fromaddress" value="100 Main Street. Los Angeles, CA 90032" />
    <input type="hidden" name="toaddress" value="200 Main Street. Los Angeles, CA 90032" />
</body>
</html>

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0

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