GetElementById With Invalid ID Causes Script To Exit?
Mar 7, 2006
I am writing a web site that uses JavaScript to validate certain forms
and I seem to be having some trouble. The site uses PHP and for one of
the forms, depending on the situation, one of of the text inputs does
not exist - the PHP doesn't generate the HTML for it. I wanted to have
the validation script check the length of the input if it exists but I
knew that I might have trouble if I tried to check the value of the
input without first checking that the input exists so I tried using
code similar to this:
if(document.getElementById("someId")!=null &&
document.getElementById("someId").value.length<8)
{
alert("String must be at least 8 characters.");
}
However, when I try that in Firefox (that's the only browser I've tried
so far), the validation script exits, the form is submitted with
errors, and I get a message in the JavaScript console saying that the
ID that I gave was invalid. I know it's invalid! That's why I checked
for null!
I thought that getElementById() would return null if the ID was
invalid. Is there any way to check if the input exists before
validating its value?
i've got a bunch of webaplications in use that the users have open in a browser all day. and so far every thing is perfecto. my problems start when the user during the day get emails with links in them... being humans they click those links and some times they "loose" the webaplication from the original browser. this also happens of course when they use their bookmarks etc.
what i would like is to include a javascript that forces a new browser window wtih the new url & leaves the original site as-is if a url is sent to the browser.
Is it possible to have an announcement popup for a user if they try to exit the page with the "X" instead of the exit button on the page? I want to make sure that they exit properly so that it logs them out of the chat...
I want to restrict getElementById to search children of a specific element instead of searching the entire document, in the same way that I can do getElementsByTagName using a specific element as the parent.
In this particular instance the parent is a table and the elements I'm interested in are all TDs, so I did the basic getElementsByTagName('TD') off the table and looped through this array checking the IDs. However, I'm suspecting that the browser can do getElementById faster than I can do a loop in javascript. Is there a neater way to do this? For now, I'll settle for IE-only solutions, though it would be nice to have things work in generic browsers.
I need an Exit popup page that when a visitor is on leaving my site it will popup. With "onUnLoad" it can work in this way but it also does something more that I don't want. When a visitor click links to pages within my site the popup will also open. I don't want this. What I need is that only when a visitor is leaving my site but current page, the popup will open. Anyone have a solution for this please give me a hand.
Basically, I have an ASP.NET page that's holding a lot of data. In case a user accidentally clicks the exit or back button, I want to pop up a javascript confirmation box that says 'Are you sure you want to exit?' and if the user clicks 'ok', the browser exits, and if the user hits 'cancel' it returns to the page, like the user never clicked the [x].
I can pop up a confirmation easily enough, but what methods do i need to use to keep the user or to close the browser? Also, I would like it if it only popped up on closing the browser or hitting back, not on a refresh, as the ASP page does a lot of post-backs.
I have read this article: http://www.nowsell.com/pop-ups/pop-up-cookies.html
While it was useful to me it did not cover my particular question. I'd like to trigger an exit pop-up that is triggered once per visitor and only if the visitor has NOT reached a specific page of the site.
For simplicity purposes, say the site consists of pages 1,2,3,4,5,6 with 1 being the main entry.
I'd like the pop-up to appear one time to each unique visitor who does not view page 6 during their site visit and appear as they are exiting the site.
Even better would be if the code could be served using SSI if it is required to be on all pages of the site so it could easily be turned on or off.
Even better would be if there were a way to make it pop to every Nth visitor up to a specific count and then stop on it's own.
When you click on the link to a web site, close the app, then open the app again, it displays the web site instead of the app. How do you get back to the app?
My issue is I would like to have this code validate my radio buttons on my form and also have an onscreen pop-up in the case that the user is exiting the page without filling out the form.I have had both of these peices of code working...but when I put both of them on the page the pop-up will override the validation script, and I don't wish to have the pop-up, pop-up when the user hits the submit button. Here are my pieces of code:Inside my head tag:
<script language="JavaScript"> function closeIt() {
A Client of mine wants a popup window to appear when a visitor to his site tries to leave. In this popup window he wants to ask 4 simple questions and offer a free gift.As popups are unpopular, and are generally blocked I went looking for another way round the problem.In some sites that I see now, I see a confirm box asking "Are you sure you want to leave this page?"Sometimes with a customised message in there as well.I was thinking of using something similar, and when the visitor presses "cancel" (to stay on the page and prevent the window closing) to then show the popup (either redirect to new page or use modal dialog overlay box, eg jQuery Thickbox).
This is probably very basic, but I don't think I'm searching the right terms to find what I need, I'm looking for an example code of how to do this.I have 3 columns (form fields below)
PRICE | ITEMS | Total
I want a user to be able to enter in a price and the amount of items so that when they leave one of those two fields, it will autocalculate and populate the "total" field. I also want the option for them to be able to fill out the total field alone, without having to enter "price" or "items". So basically 'total' has to be filled out either way, because I will then be doing calculations with that data.
I have the original script I was using along with a modified script sent back to me from someone in another forum. They also advised me to add rel="external" to all of my external links. I'm not sure if a different condition would apply whether the link stayed within my site or went elsewhere.In any event, it's still not working. The changes get me to my desired page on internal links, but the pop-up still engages and I have to click "OK" before it takes me there.I'm obviously looking to get this to work so that all internal links go straight to the page they're defined to, without the pop-up engaging at all.Both script versions are below:
My original:
<script type="text/javascript"> var internal = 0; function bunload() {
The javascript code to close the window does work in Explorer 8, but does not work using Mozilla/5.0, Google Chrome, Safari. Here's an excerpt from the code (code alignment lost of course)
<h2>Select Test Application Name</h2> <p>Please type in Application</p> <form method="post" action="./controller.php"> <fieldset>
[Code].....
Symptom is screen remains unchanged on "click" on Exit Button (except for explorer). Everything else works fine (e.g. control goes to controller.php on submit).
IE has a real problem working with my site at the moment and I want to force people to only NON Microsoft browsers for the moment until I get around to fixing the issue (I am only in beta, so its not a major issue)I have seen guides on how to do the detection, and im sure this is a real simple question, but how do i get it to stop loading the page (i.e just provide a blank white page) straight after the popup warning message? this is what i have
I'm trying to make this code run and keep getting the same error. "Could not find the main class: Initials. Program will exit." I'm using jcreator and java is up to date. I really not sure if I posted this in the correct area but
We implemented an exit popup on our page. When a user tries to leave our purchase page, an exit popup comes up saying that if they click cancel they will get a 50 dollar discount and are automatically redirected to that discounted checkout form.
The problem is, when a user clicks our "submit" button, when they are trying to purchase at full price, the exit popup shows up too, and redirects them, so essentially we can't get the full amount out of our customers! We want the script on the page, but we don't want it to show up when users click our submit button.
heres the exit popup script
Code: <script language="JavaScript" type="text/javascript"> window.onbeforeunload = confirmExit; function yPop(url) { var found = 1;
How would you exit a function if a mouse-click occurs? $(document).ready(function () { $("#btnSkate").hover(function () { loadStyleSheet(); if (iWantToBreakifClicked) { return false; }}, function () { unloadStyleSheet(); return false; }); });
Any of you know how can I stop an exit console when the visitors lefts my site trough a form button?
The below code is the function that opens the console or popup. ********************************** <script language="JavaScript"> function exit(){ window.open('XXXXXXX');} </script> **********************************
Then on the body tag ************************ <body onUnload="exit()"> ************************
I keep getting an error stating "getElementById("ballElement") is null, but I have a div with that exact id. I have looked at the JS script before that line, but found no errors there either. Please take a minute to see if you find something.
If I try to append a PARAM tag twice I'm having problems:
var.medDiv = document.getElementById("myDiv");
var medObj = document.createElement("object");
var p = document.createElement("param"); p.setAttribute("FileName",this.URL); medObj.appendChild(p);
p = document.createElement("param"); p.setAttribute("AutoStart","false"); medObj.appendChild(p); // <-- this one
medDiv.appendChild(medObj);
The line with the "this one" comment triggers IE to tell me that it has an invalid argument. If I change the order of the PARAMs then the new second PARAM will give me the error. If I move the setAttribute to after the appendChild I still get the error.
This string is a key in our database that I have no control over and I want to set the value of the menu according to this value because it is unique. I suspect that the '' or the '>' or the '!' is making Javascript think that this is a different type of data than string.
Is there a way to 'force' Javascript to interpret this as string?
I amreceivingthe following error on IE8:Invalid argument. jquery-1.4.2.js, line 5899 character 5 Now I have used the debugger, and this seems to be the only error it catches. And I realize that I could go through each line of what I wrote and figure out what line triggered this portion of jQuery. However in the interest of making jQuery better, I want to understand this error and fix it in the jQuery file.
