I am using the onbeforeunload client-side event to prompt a user when
leaving a page after they have made changes, as discussed in this
article: Using ASP.NET to Prompt a User to Save When Leaving a Page
[ http://aspnet.4guysfromrolla.com/art...101304-1.aspx]. The problem
I am having is with the page unloading via eval. Specifically, I am
using telerik r.a.d. menu
[ http://telerik.com/Default.aspx?PageId=1415], which redirects users to
another page via script like:
eval('window.lo cation.href='ur l of menu item');
When a user attempts to leave the page via a menu option, they get the
prompt, as expected, but if they click Cancel there is a script error:
Unspecified error on the line number of the eval() function call. This
works just fine in Firefox.
I created a VERY simple page to test this out and confirm that it is
the eval() function. The page below, when visited through IE, displays
the prompt and if I click Cancel I get the same Unspecified error.
<script>
function foo()
{
return "bar";
}
window.onbefore unload = foo;
eval('window.lo cation.href=\'h ttp://www.google.com\ '');
</script>
I was unable to find any info via Google as to if this is a well-known
bug or if there are any workarounds. Any ideas/suggestions/comments
most appreciated. (I'm posting this in the telerik forums as well;
hopefully there's an easy way to get rid of those eval() statements,
but I doubt it... )
TIA 12 8477
Scott Mitchell wrote:
<snip> eval('window.lo cation.href=\'h ttp://www.google.com\ ''); </script>
<snip> hopefully there's an easy way to get rid of those eval() statements, but I doubt it... )
No, its easy to get rid of that - eval - call. You just remove it:-
window.location .href = 'http://www.google.com' ;
Richard.
The eval statement is embedded in the logic for a particular ASP.NET
Web control (telerik's r.a.d. menu). Removing the eval() is not as
simple as you make out. Basically there is a JavaScript function in
the script library for r.a.d. menu that does an eval of what is passed
in, and that particular command - window.location .href... - might be
passed in, depending on a variety of menu settings and so forth.
Scott Mitchell wrote: The eval statement is embedded in the logic for a particular ASP.NET Web control (telerik's r.a.d. menu). Removing the eval() is not as simple as you make out. Basically there is a JavaScript function in the script library for r.a.d. menu that does an eval of what is passed in, and that particular command - window.location .href... - might be passed in, depending on a variety of menu settings and so forth.
Then get a better menu system.
--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
So are you saying that onbeforeunload and eval are not compatible with
IE and there's not a known workaround?
Getting a new menu control is probably the last option since, (a)
Money's been dropped on this one, and (b) The menu control is working
great except for this issue on a very large site. Replacing it would
no doubt take considerable time and effort, so I'd like to exhaust this
avenue first.
Scott Mitchell wrote: So are you saying that onbeforeunload and eval are not compatible with IE and there's not a known workaround?
<snip>
One of the reasons that competent javascript authors do not use the -
eval - function (except under the most rare and extreme circumstances)
is that it obscures errors. If you just remove it and re-try the code
you may get additional insight into the cause of the problem.
Richard.
I think the *precise* cause of the onbeforeunload error is because the
script that's unloading the document occurs in the eval(). That is, in
the script sample code I sent that causes a problem, if I move the
window.location .href out of the eval(), everything works as expected.
So I believe that I have identified what, precisely, is the root cause
of this problem. I am wondering if there's a known workaround, though,
so I don't have to go through the complete hassle of retooling my site
to use a different menu component.
(I've also asked this question on telerik's support forums, so
hopefully they'll have some suggestions/insight there...)
Scott Mitchell wrote: I think the *precise* cause of the onbeforeunload error is because the script that's unloading the document occurs in the eval(). That is, in the script sample code I sent that causes a problem, if I move the window.location .href out of the eval(), everything works as expected.
So I believe that I have identified what, precisely, is the root cause of this problem. I am wondering if there's a known workaround, though, so I don't have to go through the complete hassle of retooling my site to use a different menu component.
The "workaround " was given to you. Remove the eval, "everything works as
expected", and everybody is happy.
--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Randy, is that the only workaround? As I explained earlier, that is
not a viable option. Are there any other workarounds you know of? Can
you (or someone else) point me to a URL that explains this
onbeforeunload and eval() problem in IE in more detail?
Thanks.
Scott Mitchell wrote: Randy, is that the only workaround? As I explained earlier, that is not a viable option. Are there any other workarounds you know of? Can you (or someone else) point me to a URL that explains this onbeforeunload and eval() problem in IE in more detail?
When I tested your code last night removing the - eval - function
resulted in code that exhibited exactly the same behaviour and threw
exactly the same exceptions. Which suggests that there is no
incompatibility problem with the use of - eval - in this context, and so
there can be no work around for its use.
Richard. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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