Preventing Code From Being Executed In Onload
Sep 26, 2004
I have some code that gets executed in a document onload event.
I display an alert message box saying that some action was performed successfully.
However the following annoying issue is bothering me.
Whenever someone bookmarks the page, or go back to it, or even refreshes it, then the onload event gets fired again and the alert box appears.
Is there a safe way to make sure that the code in onload will get executed only once? and that cosecutive triggering of the page will not trigger any code execution.
The most important thing to note, is that I pass a parameter in the URL indicating that the code should be triggered in the onload event.
Obviously when I refresh the screen, the parameter is passed again and the code gets executed..
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Jul 20, 2005
I would like to ignore onUnload action when the user reloads the page!!
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May 28, 2009
Ok I made a post yesterday for a calculations script and I figured it out.Now the problem I have is as soon as I put it on my website a competitor is going to steal the code and put it on his/her/their page.Is there a way that I can put in my html a call to the javascript so that it just gets the script runs it and then displays it to my page without actually having the source displayable anywhere? Here is the code I made that I want to protect:
Code:
<html>
<head>
<script type="text/javascript">[code].....
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Dec 5, 2011
Until now I have used the javascript function eval(), wrapped it in a try / catch block and showen him the error message if the javascript code was flawed.But this comes with the problem that if there is no error the script will be executed.So what I´d like to is use the jquery function globalEval(), wrap it in a try / catch block and display the error message if the script does not run sucessfully as I have done before,BUT:if the script would execute without an error I´d like to use some kind of preventDefault so that the script would not be executed at all and instead I could show the user a message that the script passed validation.I know that the way I propose is not possible as the script has to be executed somehow so that possible errors are generated...does anyone have an idea how to do what i propose ?
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May 25, 2011
I have my page here [URL]. There is a tab system on the page that uses javascript. View the source the see the javascript file (tabber9.compressed.js). Now, on my end, I am adding some tracking code. The code looks like this:
<SCRIPT TYPE='text/javascript' LANGUAGE='JavaScript'><!-- //
window.onload = initPage;
function initPage() {
if (this.GetCustomerGUID)
document.forms["Test"].elements["CustomerGUID"].value = GetCustomerGUID();
}//--></SCRIPT>
The problem is, when I add this code to my footer, it breaks the tab system. The tabs don't work any more. I am not a JavaScript expert by any means (or else I would have known what the issue is! lol) but, I guess it has something to do with the window.onload function? I say that because I see the window.onload code in the tabber javascript as well.
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Jul 23, 2005
I'm having a hard time figuring out why the onload event is not being
called for the frameset window in the following simple example. It is
being called for each of the component frames. Code:
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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'm trying to create a text field that, when two or more characters
are entered, the form is automatically submitted. The trouble I'm
having is knowing when the onSubmit handler is fired. It's supposed
to be executed when the form is submitted. I'm doing a submit via JS
which should cause the form to run the onSubmit handler. But, it
isn't. This leads me to believe that calling submit() is different
from a hard submit. True?
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Oct 7, 2006
can anyone tell me why the second 'alert()' is not executed here?
The first 'alert()' pops up (so I know I am inside the 'if'), but not the
second one, and orderNum is not set....
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Apr 26, 2011
Ive got the following code :
in aspx file
in head:
<script type="text/javascript">
function LoadBlocks() {
$(".LoadBlocks").click();
[Code]....
Like i said above when I call LoadBlocks function the click in executed in code behind but nothing else in the javascript function is beeing executed , not event an alert
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Jun 23, 2010
I have the following code
Code:
function hideDisplaySingleSuite(textstring) {
var myclass1 = new RegExp('\b'+textstring+'\b');
//Populate the array with all the page tags
[Code].....
are executed, meaning that first the rows with a class is shown and then they are hidden.
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Nov 29, 2011
i need to wrap the following code with (function($){ ... })(jQuery);But when i do so than the callbackfunction jsonpCallback will not be executed anymore.I hope someone can explain that to me...
// ( function($)
{$(document).ready(function() {
var error_container = $('#ul_demo_error')
[code]....
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Apr 29, 2010
I have a div with a click event that fires a show('slow')... however if the user clicks on the div multple times the animation plays that many times... is there a way to make it so that the click event is only executable once the animation is complete?.
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Jul 10, 2009
I am experiencing some crazy stuff, at least crazy to me Both the 'if' and 'else' blocks (according to firebug) are being executed in the following anonymous function:
[Code]...
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Jul 27, 2011
how I could use firebug to step through massive amounts of javascript that were written by someone else. I'm trying to figure something out for work which has me stumped.
An old co-worker wrote some scripts based on prototype to show input fields on a form when certain options were selected on the previous input fields. I'm trying to duplicate his old code but for some reason it's just not working. I can see that the reason those input fields aren't showing up is because display:none is being added on to the element by the js on the second step after the breakpoint (break on attribute change in firebug). This happens on the working page as well but the working page has about 10 more steps afterwards that eventually remove that style.
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Dec 23, 2005
I am writing an extension to a third party application. this
application generates code dynamically using insertAdjacentHTML(). I
want to execute my function whenever the insertAdjacentHTML is called.
Does insertAdjacentHTML() fire any event that i can handle and execute
my function? or is there any other solution?
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May 10, 2010
I am trying to execute slightly more than "Hello, world" using .ajax() specifically and with both a success and error callback. I have:
[Code]...
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May 1, 2009
I'm trying to dynamically write out this line of javascript:
obj.offsetLeft
So I want to be able to feed a param of either Top or Left in and then write it out so it gets execuated correctly in the javascript....so i've tried stuff like:
function findPos(axis) {
obj.offset[axis]
and
function findPos(axis) {
obj.offset+[axis]
where axis is either Left or Top
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Jun 15, 2010
OK that's my HTML [code]...
The unexpected behavior-problem is that wherever the pointer moves between the the <li> elements (next or previous), the whole hide_menu() and show_menu() is executed as if the pointer got out of the div space and re-entered.
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Apr 23, 2009
Using ajax and jquery I'm calling a function on the server code that returns a javascript script that I need to assign to a div and get executed automatically when assigned.So far I couldn't do that, seems that the assigned script to the innerHTML of the div can'r be executed dynamically.Basically I'd like something like assign an alert('hello world') to the innerHTML and automatically see the pop up with the message.
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Mar 22, 2010
I am new to all this but making good progress and having fun in the process. I have written quite a bit over recent weeks (including a few $.post / $.ajax calls) for various sites/applications but this one is really puzzling me. Here is a snippet of code that is causing me problems.
[Code]....
The problem is that execution jumps from line 2 to line 6 ... ignoring the function(data) and I am not sure why. I get the correct value of "team" arriving at the perl script .... and the perl writes the correct json back. I just can't think where else I need to look to debug this - as I said, I have done something similar 5-6 times over the last few weeks - all without a problem. So I am sure I am doing something stupid here.
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Apr 29, 2011
Im having some troubles with some functions i launch in $(document).ready() to initialize the page. Then if i click on browser refresh everything goes fine... even more strange when i place alerts between then calls to these functions everything goes fine too... but the first time the page is loaded it seems that the functions are not executed at all.
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Feb 18, 2011
I am a self thought web developer and am constantly having problems making sure that certain commands are finished executing before others are started. My most recent problem is trying to append a large amount of data, to a div, then sliding it down slowly. Since that data takes a while to append, the system is doing both at the same time, therefore not giving me the slide down effect. Here is the code:
$('#SomeDiv').append(data);
$('#image1').animate({"left": "+=300px","top": "-=200px"}, "slow");
$('#image2').animate({"left": "+=120px"}, "slow");
$('#Image3').animate({"top": "+=250px","left": "+=300px"}, "slow");
[Code].....
Where "SomeDiv" is part of "cpage" and "data" is a large amount of images. I would like to execute line 1 and then all the other lines simultaneously. It is currently executing all of the simultaneously.
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Dec 28, 2010
In the following code - Sometimes I get the correct image width and sometimes I get an image width that is ZERO. How do I make sure the loaded image attributes are there before I access them. Odd thing is if I click the same thumbnail twice I always get the width. If I click a thumbnail once I may get the width this time BUT when I refresh I may get a ZERO width.
Here is the code...
$(document).ready(function() {
$('#gallery a').click(function(evt) {
evt.preventDefault();
var oldImage = $('#photoBox img'); // Selects the current image
var newImage = new Image(); // Create a new image
var imagePath = $(this).attr('href'); // get the path to the image file to load that was clicked - via its href attr name
newImage.src = imagePath;// Set the newIamge.src to file name or Path
if (newImage.width < 600) // If the width is less than 600 calculate a new margin to center the new image {
var newMargin = (620 - newImage.width) / 2;
var newHtml = $('<img src="' + imagePath + '">');
$('#photoBox').css('margin-left',newMargin);
$('#photoBox').css('width',newImage.width);
} else
// assume width is 600 {
var newHtml = $('<img src="' + imagePath + '">');
$('#photoBox').css('width',newImage.width);
$('#photoBox').css('margin',5);
} newHtml.hide(); // hide the newHtml before prepending will fade it in
oldImage.hide(); // hide the old image
$('#photoBox').prepend(newHtml); // prepend the newHtml
newHtml.fadeIn(1000,function() { }); // now fade it in
});});
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Apr 27, 2010
I am building a navigation which animates width on mouseover and revert it on mouseleave. That navigation also supports keypress/keydown actions, so it behaves like you hover with the mouse and additionally opens the submenu too. My problem is, when using the keydown (C) function, the menu opens up perfectly but when I mouseover then, it fires the 1. function and behaves like it should, it closes. I tried to stop that when just using keydown, but somehow I am stuck with it. Here comes the code:
$
(
function
()
[Code]....
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