Onload Versus Placing Script At The End Of The Body?
Aug 26, 2009
If I have some JavaScript I need to run after a page is loaded, I can either use something like <body onload="initialize()">, or I can just include the script at the end of the page.According to Google Analytics, it is sometimes best to put it just before the </body> tag and not use onload. Quote: ...the physical placement of the tracking code call at the bottom of the page is more effective than using an onLoad() function...However, Google Maps uses the onload solution even though locating the script in the body works as well. Is there a general approach which is best? If the best approach depends on the specific application, what factors influence using one way over another.
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Jul 23, 2005
For instance, one set is:
<body onload="blinking_header()" onunload="stoptimer()">
Another set is:
<body onload="writemsg()" onunload="stoptimer()">
They represent two functions. How to place them in the <body> tag?
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Jun 9, 2009
This questions mainly regards using google's analytics code on some of our websites. We currently place the code at the footer as it can hinder load times if placed further up in the page.
For this, or in general use, is placing javascript in the BODY or HEAD better for one or the other as far as load times? Can placing scripts in one or the other allow the page to load concurrently with the script and not sequentially?
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Dec 3, 2005
I wander what gets loaded the fastest (1-2 or 3) in what succession:
<head>
<script type="text/javascript">
function andAction() {
// doing stuff
}
</script>
</head>
<body onload="andAction();">
<script type="text/javascript">andAction()</script></body>
just in the head and nothing more
This I am sure off:
<head>
<script type="text/javascript">
window.onload = function andAction() {
// doing stuff
}
</script>
</head>
<script type="text/javascript">andAction()</script></body>
just in the head and nothing more (should be 1)
Third and last which is faster:
body onload or window.onload
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Jul 23, 2005
I'm seeing a difference in behaviour between
window.onload = f();
and
<body onload="f();">
Specifically, window.onload appears to fire before all the elements of
the page have been rendered. As the difference is consistent across
IE/Moz/Opera, I'm assuming it's deliberate - can anyone point me
towards where this behaviour of window.onload is defined in the
documentation? TIA. Code:
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Jul 23, 2005
I need to execute a JavaScript function "onload". The only problem is I
don not have access to the <body> tag as it is a part of the standard
page-header include (a separate file). How could I have certain pages
execute my function() onLoad?
The function basically just sets the original values of fields so that I
can determine if a field has been changed or not, which aleviates unnec.
sql update on the backend..
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Feb 9, 2008
Does onload always have to be in the <body> tag?
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Dec 30, 2003
I'm trying to get a popup working on my site. I use headers and was wondering if there is a way to put the onload outside of the BODY tag? My header has the BODY tag in it. I only want the popup to come up on one page and not all the pages that use my header.
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May 28, 2004
I have created a page that takes a person to another page automatically:
<body
However, the script waits for the entire page to load before actually taking the person to the other page. What I need to do is to have a script that takes the visitor to the target page as soon as the page appears (without waiting for ads to load completely). How can this be done?
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Jul 3, 2004
Just wondering if anyone knows if it's bad practice to put multiple body tags within one document? I'm using a template system (php) that loads template files into a main template (already containing a body onLoad()), and the content files also have a body onLoad() preloading functions intact. It seems to be working but wanted to know if there is anything wrong with this? What about broswer specific issues?
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Dec 20, 2001
How do you code two "onload's" in the body tag?
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Dec 18, 2002
I'm working in a template environment, and I can't change the <body onLoad> tag (it already had a muti-use function on it.
On the specific page I'm working on, I need some layer visibilities changed (dependant on a cookie) which seemingly can only can be done in the onLoad event.
so I need to add to or capture the onLoad for one page, and no others with a script included in the body data? (and of course it needs to be cross-broswer compliant 5+)
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Jul 23, 2005
Is it possible to make a javascript call before "<body onload='...'>"?
What I'm doing is a preview of numerous images in an iframe and I want to
resize the iframe to match each picture. Normally I'd use the 'onload' (on
the src-page holding the image in the iframe) attrubute, but it's not called
until the picture has finished loading. I'd like to resize the iframe before
(or at the same time) the image starts loading.
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Feb 13, 2009
I have a script that I have been using for a while that works with 3 sets of div tags. The first is visible and the second two are hidden. Using a select menu you can swap which div tag is visible by selecting that option.
Now this works fine using <body onload="opts();"> to call the function the only problem is that the page I am running this script on has a lot of images and the second two tabs are visible until the page has completely finished loading. This is only for a matter of a second or two but still a problem.
I am not very smart when it comes to JavaScript and I have messed around with adding window.onload = opts(); to the script but kind of unsuccessful. This works in the sense that the second two sets of div tags are invisible from the start of loading the page. There are only two problems with this solution.
1. The script isn't functional (can't swap visibility on div tags) until the entire page has finished loading. -- I can live with this if I have to
2. There is a javascript error message in IE 'null' is null or not an object. This could potentially scare some people away when they see they yellow triangle in the lower left-hand corner of the window.
Here is the code I am using:
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Test Page</title>
[Code]..
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Jan 26, 2006
Want to know is is possible to have 2 diff. onload events in the same page? I have 2 different scripts for 2 diff. things. They both use onload event.....if so, how can we handle it.
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May 7, 2010
I'm using ajax to display the xml file. On my html i put <body onload="sendRequest(Display)">
so everytime users go to the main.html, all the information in xml will be displayed after transformed by XSL Now the problem is it gets the error Display is not defined While i did define it in js file this is what I do in js;
[Code]...
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Jul 9, 2009
Is there a substitute to <body onload="validate();"> i.e. I need to call a JS Function on load of a page, but without using <body onload> I've tried window.onload, but it didn't work. Is there a way to do this?
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Oct 9, 2001
I'm building an ecommerce store that will not allow me access to the <body tag... Is there any way to load the onLoad js call another way?
I tried putting a layer with a high z-index and a clear pixel stretched out in it... I've tried the call as onLoad and as mouseover... I can't get it to work. What am I missing? If you'd like to see my mess, it's here:
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Sep 15, 2011
Does anyone have a way to load an onload into the body tag externally so for example the html page is as follows:
Code:
<html>
<head>
<title></title>
<script type="text/javascript">
[code]...
we are going to have our customers insert some code onto there page and it load out application.instead of telling them to manually change there body tag I want the script to do it for them.
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Jul 26, 2006
I have dynamically named form elements set in divs based on a
server-side language. I am displaying these using DHTML in a
display:none, display:block format.
Due to some code (and deadline) issues I do not have the total number
of form elements set by the time the body tag is run. I wanted to have
a script tag later on in the document which reads something like:
<query>
<builds div element1i1, element1i2, etc>
<script language="javascript">
document.getElementById(' query variable '+1).style.display = 'block'
</script>
</query>
However the JavaScript code does not run. Alerts run inside the code
consistently, but the other code does change the display to block.
also tried running this same code as on OnFocus...
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Jun 22, 2007
Is it possible to load multiple onload events in the body tag?
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Oct 20, 2010
I am trying to hide a table in the body onload event, but i am getting error as Object Expected. Below is the code i have used:
Code:
function HideTable()
{
document.getElementById('Table10').style.display ="none";
}
<body onLoad="javascript:HideTable();">
When i tried with a alert in the onLoad event, the alert was getting trigerred. How to call a function in the onload event.
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May 3, 2010
how to use an javascript function to redirect without using <body onload>.
Normally I use this: <META HTTP-EQUIV="Refresh" Content="0;URL=ajax.php?page=mypage">
But since I'm using ajax, and only want to redirect tha ajax part, the above can not be used...
When I have a hyperlink to go to a page in ajax it looks like this: <a href="#" onclick="load('ajax.php?page=mypage','contentarea');return false;">
Is there anyway that I can have the ajax part set into the META HTTP-EQUIV="Refresh" or is there an other way to do this?
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Feb 2, 2011
I am having trouble loading a drop down menu list script that I got from Dynamic Drive.Here's the original test page. (Works Fine)
<html>
<head>
<script language="javascript" src="http://www.modbargains.com/images/Javascript/ChainSel/chainedmenu.js">
</script>
[Code]...
I am not sure if the function is correct but it does not work. Any ideas how I can make this work????
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Sep 16, 2010
Lets say I have a Javascript function, and want to start it on onload. This is what I've done:
<script language="javascript" type="text/javascript">
function blabla(){
}
</script>
<body onload="blabla()">
</body>
Well the function will return a value depending on the users installed toolbars. Unfortunatly this works only for Internet Explorer, I have tried on FireFox and it doesnt work :S Any way to load a function on startup with firefox?
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Jun 29, 2011
I want to fire onload event of body tag on click of a HTML button.Like if I click on the button the body's onload event will fire and a function called on onload event of body tag will execute.
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