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javascript: and about: Protocols Not Working

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  javascript: and about: Protocols Not Working Gene Wirchenko <genew@ocis.net> - 2011-11-30 18:28 -0800
    Re: javascript: and about: Protocols Not Working Martin Honnen <mahotrash@yahoo.de> - 2011-12-01 11:53 +0100
      Re: javascript: and about: Protocols Not Working Richard Cornford <Richard@litotes.demon.co.uk> - 2011-12-01 04:29 -0800
      Re: javascript: and about: Protocols Not Working Tim Streater <timstreater@greenbee.net> - 2011-12-01 12:37 +0000
        Re: javascript: and about: Protocols Not Working Martin Honnen <mahotrash@yahoo.de> - 2011-12-01 14:02 +0100
          Re: javascript: and about: Protocols Not Working Martin Honnen <mahotrash@yahoo.de> - 2011-12-01 14:19 +0100
            Re: javascript: and about: Protocols Not Working "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2011-12-02 11:31 +0200
              Re: javascript: and about: Protocols Not Working Martin Honnen <mahotrash@yahoo.de> - 2011-12-02 15:43 +0100
                Re: javascript: and about: Protocols Not Working "Jukka K. Korpela" <jkorpela@cs.tut.fi> - 2011-12-02 19:57 +0200
      Re: javascript: and about: Protocols Not Working Richard Cornford <Richard@litotes.demon.co.uk> - 2011-12-01 04:03 -0800
      Re: javascript: and about: Protocols Not Working Gene Wirchenko <genew@ocis.net> - 2011-12-01 12:14 -0800
        Re: javascript: and about: Protocols Not Working Erwin Moller <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> - 2011-12-02 10:01 +0100
          Re: javascript: and about: Protocols Not Working Gene Wirchenko <genew@ocis.net> - 2011-12-02 12:35 -0800
            Re: javascript: and about: Protocols Not Working Tim Streater <timstreater@greenbee.net> - 2011-12-02 20:39 +0000
              Re: javascript: and about: Protocols Not Working Gene Wirchenko <genew@ocis.net> - 2011-12-02 13:56 -0800
                Re: javascript: and about: Protocols Not Working Tim Streater <timstreater@greenbee.net> - 2011-12-02 23:40 +0000
                Re: javascript: and about: Protocols Not Working Dr J R Stockton <reply1148@merlyn.demon.co.uk> - 2011-12-03 19:13 +0000
              Re: javascript: and about: Protocols Not Working Jake Jarvis <pig_in_shoes@yahoo.com> - 2011-12-02 23:01 +0100
    Re: javascript: and about: Protocols Not Working Arno Welzel <usenet@arnowelzel.de> - 2011-12-04 15:46 +0100
    Re: javascript: and about: Protocols Not Working Bwig Zomberi <zomberiMAPSONNOSPAM@gmail.invalid> - 2011-12-06 11:41 +0530

#8733 — javascript: and about: Protocols Not Working

Dear JavaScripters:

     The text that I am using refers to javascript: and about:
protocols.  None of the examples will run on my system (IE 9 on
Windows 7).

     For
          javascript:Date()
I get nothing.  For
          about:cache
and
          about:plugins
I get a message of "Navigation to the webpage was canceled / What you
can try: / - Retype the address."

     I have looked for settings to enable these and have found
nothing.  What am I missing, please?

Sincerely,

Gene Wirchenko

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#8737

Gene Wirchenko wrote:
> Dear JavaScripters:
>
>       The text that I am using refers to javascript: and about:
> protocols.  None of the examples will run on my system (IE 9 on
> Windows 7).
>
>       For
>            javascript:Date()
> I get nothing.

Well where/how do you use it exactly? When I type that line into IE 9's 
address bar and hit enter it displays the current date (e.g. Thu Dec 1 
11:51:52 UTC+0100 2011) in the browser window.

 > For
>            about:cache
> and
>            about:plugins
> I get a message of "Navigation to the webpage was canceled / What you
> can try: / - Retype the address."
>
>       I have looked for settings to enable these and have found
> nothing.  What am I missing, please?

Well that about stuff is something Netscape and later Mozilla 
implemented, I have never heard that Microsoft browsers supported that.




-- 

	Martin Honnen --- MVP Data Platform Development
	http://msmvps.com/blogs/martin_honnen/

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#8738

On Dec 1, 10:53 am, Martin Honnen wrote:
> Gene Wirchenko wrote:
>> Dear JavaScripters:
>
>>       The text that I am using refers to javascript: and about:
>> protocols.  None of the examples will run on my system (IE 9 on
>> Windows 7).
>
>>       For
>>            javascript:Date()
>> I get nothing.
>
> Well where/how do you use it exactly? When I type that line into
> IE 9's address bar and hit enter it displays the current date
> (e.g. Thu Dec 1 11:51:52 UTC+0100 2011) in the browser window.

IE 9 seems to have an odd characteristic where is you _paste_ a
javascript pseudo-protocol URL into the address bar then it does not
include the 'javascript:' bit from the beginning, and you have to re-
type it manually.

>> For
>
>>            about:cache
>> and
>>            about:plugins
>> I get a message of "Navigation to the webpage was canceled / What
>> you can try: / - Retype the address."
>
>>       I have looked for settings to enable these and have found
>> nothing.  What am I missing, please?
>
> Well that about stuff is something Netscape and later Mozilla
> implemented, I have never heard that Microsoft browsers supported
> that.

Yes, Microsoft provide other means of accessing that sort of
information. The cache from:-

Tools->Internet Options...->General(tab)->Browsing history(section)-
>Settings(button)->View Files(button).

- and the plug-ins from:-

Tools->Internet Options...->Programs(tab)->Manage add-ons(button).

Richard.

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#8739

In article <4ed75ca4$0$6638$9b4e6d93@newsspool2.arcor-online.net>,
 Martin Honnen <mahotrash@yahoo.de> wrote:

> Gene Wirchenko wrote:
> > Dear JavaScripters:
> >
> >       The text that I am using refers to javascript: and about:
> > protocols.  None of the examples will run on my system (IE 9 on
> > Windows 7).
> >
> >       For
> >            javascript:Date()
> > I get nothing.
> 
> Well where/how do you use it exactly? When I type that line into IE 9's 
> address bar and hit enter it displays the current date (e.g. Thu Dec 1 
> 11:51:52 UTC+0100 2011) in the browser window.

I get nothing in Safari either. But I find this unsurprising, since 
you've not told anyone to do anything with the date info that Date() 
returns. If I go javascript:alert(Date()); then I get an alert panel up 
with the date/time in it. Or I can do javascript:console.info(Date()); 
and get the time/date in the error console window as expected.

Or I can do javascript:document.write(Date()); and then it appears in 
the browser window as expected. If IE9 is putting it there without 
document.write I'd call that a bug.

> > For
> >            about:cache
> > and
> >            about:plugins

Neither of these does anything in Safari.

-- 
Tim

"That excessive bail ought not to be required, nor excessive fines imposed,
nor cruel and unusual punishments inflicted"  --  Bill of Rights 1689

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#8741

Tim Streater wrote:
> In article <4ed75ca4$0$6638$9b4e6d93@newsspool2.arcor-online.net>,
> Martin Honnen <mahotrash@yahoo.de> wrote:
>
>> Gene Wirchenko wrote:
>> > Dear JavaScripters:
>> >
>> > The text that I am using refers to javascript: and about:
>> > protocols. None of the examples will run on my system (IE 9 on
>> > Windows 7).
>> >
>> > For
>> > javascript:Date()
>> > I get nothing.
>>
>> Well where/how do you use it exactly? When I type that line into IE
>> 9's address bar and hit enter it displays the current date (e.g. Thu
>> Dec 1 11:51:52 UTC+0100 2011) in the browser window.
>
> I get nothing in Safari either. But I find this unsurprising, since
> you've not told anyone to do anything with the date info that Date()
> returns. If I go javascript:alert(Date()); then I get an alert panel up
> with the date/time in it. Or I can do javascript:console.info(Date());
> and get the time/date in the error console window as expected.
>
> Or I can do javascript:document.write(Date()); and then it appears in
> the browser window as expected. If IE9 is putting it there without
> document.write I'd call that a bug.

Not at all, with a javascript: URL you are supposed to write some 
Javascript code that is evaluated and whose value is then displayed in 
the window or frame. At least that was the original intent when the 
syntax was introduced. You even had to use
   void 0
at the end of your Javascript code if you did not want the result of the 
code to be displayed in the window or frame.

-- 

	Martin Honnen --- MVP Data Platform Development
	http://msmvps.com/blogs/martin_honnen/

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#8742

Martin Honnen wrote:

> Not at all, with a javascript: URL you are supposed to write some
> Javascript code that is evaluated and whose value is then displayed in
> the window or frame.

http://home.arcor.de/martin.honnen/html/test2011120101.html is an 
example, the iframe content is generated by a javascript: URL, works in 
IE 9, Firefox, Google, Opera. The link works in IE 9, Firefox, Opera but 
not in Chrome, but I don't get any error message so I am not sure 
whether that is some kind of security restriction.


-- 

	Martin Honnen --- MVP Data Platform Development
	http://msmvps.com/blogs/martin_honnen/

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#8760

2011-12-01 15:19, Martin Honnen wrote:

> http://home.arcor.de/martin.honnen/html/test2011120101.html is an
> example, the iframe content is generated by a javascript: URL, works in
> IE 9, Firefox, Google, Opera. The link works in IE 9, Firefox, Opera but
> not in Chrome, but I don't get any error message so I am not sure
> whether that is some kind of security restriction.

I would expect javascript: URLs to behave differently depending on 
browser, in sufficiently complicated cases at least. There is no 
specification on the exact meaning and treatment of such URLs.

By the way, your test code shows, on one of my browsers,
"Today is Fri Dec 02 2011 11:08:04 GMT+0200 (Suomen normaaliaika)."
What's that odd parenthetic note there? I know what it means... but why 
does it appear in text in English? :-)
Implicit Date to string conversions aren't really suitable even for 
demos, as they may inadvertantly demonstrate the lack of proper 
localization in JavaScript and its implementations.

But returning to javascript: URLs, yesterday I stumbled across a bug 
(some key links not working at all on some modern browsers), which 
turned out to be caused by legacy code that uses an href attribute with 
javascript: URL _and_ target="_blank". Isolated to a simple case:
http://www.cs.tut.fi/~jkorpela/js/target.html
On Firefox 8, the "link" opens a new tab with about:blank contents. With 
the target attribute removed,
http://www.cs.tut.fi/~jkorpela/js/targetless.html
it works as intended.

-- 
Yucca, http://www.cs.tut.fi/~jkorpela/

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#8763

Jukka K. Korpela wrote:



> But returning to javascript: URLs, yesterday I stumbled across a bug
> (some key links not working at all on some modern browsers), which
> turned out to be caused by legacy code that uses an href attribute with
> javascript: URL _and_ target="_blank". Isolated to a simple case:
> http://www.cs.tut.fi/~jkorpela/js/target.html
> On Firefox 8, the "link" opens a new tab with about:blank contents. With
> the target attribute removed,
> http://www.cs.tut.fi/~jkorpela/js/targetless.html
> it works as intended.


With the target being set, the browser first opens a new tab and in the 
contents of that tab evaluates the Javascript code. As there is no 
content at all in that tab the function call "openUp()" to a function 
named "openUp" fails as no function is defined at all in the new tab. At 
least that is how Mozilla and Opera do it, Chrome does what you want.
An attempt to "fix" that or at least to demonstrate the issue is 
http://home.arcor.de/martin.honnen/html/test2011120201.html but it now 
only gives a popup in Firefox and Chrome, Opera blocks it. And of course 
with Firefox you now have a new empty tab and a popup window.

So none of that is really a viable approach.


-- 

	Martin Honnen --- MVP Data Platform Development
	http://msmvps.com/blogs/martin_honnen/

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#8781

2011-12-02 16:43, Martin Honnen wrote:

>> legacy code that uses an href attribute with
>> javascript: URL _and_ target="_blank".
[...]
> With the target being set, the browser first opens a new tab and in the
> contents of that tab evaluates the Javascript code. As there is no
> content at all in that tab the function call "openUp()" to a function
> named "openUp" fails as no function is defined at all in the new tab.

Sounds like a simple explanation, and Firefox indeed shows an error 
message about openUp being undefined.

> At least that is how Mozilla and Opera do it, Chrome does what you want.

Well, this wasn't really my code, or even my code. :-) Just an 
interesting observation. And although the fix would be simple, it seems 
to be legacy code that nobody wants to take care of.

> So none of that is really a viable approach.

Indeed, if someone wants to open a web page in a new window with 
specific properties, it is surely much better to set up a normal link, 
then add an onclick handler that creates a window for the link to use, 
so that the page works fine when JavaScript is off and in a 
cross-browser way when it is on. But I'm afraid there's a lot of code 
around that uses javascript: URLs in href attributes instead of any 
robust approach.

-- 
Yucca, http://www.cs.tut.fi/~jkorpela/

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#8740

On Dec 1, 10:53 am, Martin Honnen wrote:
> Gene Wirchenko wrote:
>> Dear JavaScripters:
>
>>       The text that I am using refers to javascript: and about:
>> protocols.  None of the examples will run on my system (IE 9 on
>> Windows 7).
>
>>       For
>>            javascript:Date()
>> I get nothing.
>
> Well where/how do you use it exactly? When I type that line into
> IE 9's address bar and hit enter it displays the current date
> (e.g. Thu Dec 1 11:51:52 UTC+0100 2011) in the browser window.

IE 9 seems to have an odd characteristic where is you _paste_ a
javascript pseudo-protocol URL into the address bar then it does not
include the 'javascript:' bit from the beginning, and you have to re-
type it manually.

>> For
>
>>            about:cache
>> and
>>            about:plugins
>> I get a message of "Navigation to the webpage was canceled / What
>> you can try: / - Retype the address."
>
>>       I have looked for settings to enable these and have found
>> nothing.  What am I missing, please?
>
> Well that about stuff is something Netscape and later Mozilla
> implemented, I have never heard that Microsoft browsers supported
> that.

Yes, Microsoft provide other means of accessing that sort of
information. The cache from:-

Tools->Internet Options...->General(tab)->Browsing history(section)-
>Settings(button)->View Files(button).

- and the plug-ins from:-

Tools->Internet Options...->Programs(tab)->Manage add-ons(button).

Richard.

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#8754

On Thu, 01 Dec 2011 11:53:27 +0100, Martin Honnen <mahotrash@yahoo.de>
wrote:

>Gene Wirchenko wrote:
>> Dear JavaScripters:
>>
>>       The text that I am using refers to javascript: and about:
>> protocols.  None of the examples will run on my system (IE 9 on
>> Windows 7).
>>
>>       For
>>            javascript:Date()
>> I get nothing.
>
>Well where/how do you use it exactly? When I type that line into IE 9's 
>address bar and hit enter it displays the current date (e.g. Thu Dec 1 
>11:51:52 UTC+0100 2011) in the browser window.

     Exactly as you do.  When I do that, I get nothing.

> > For
>>            about:cache
>> and
>>            about:plugins
>> I get a message of "Navigation to the webpage was canceled / What you
>> can try: / - Retype the address."
>>
>>       I have looked for settings to enable these and have found
>> nothing.  What am I missing, please?
>
>Well that about stuff is something Netscape and later Mozilla 
>implemented, I have never heard that Microsoft browsers supported that.

     Why do I get a message "Navigation to the webpage was canceled"?
Cancelled?  That implies that my entry was recognised but disallowed.
And so I went searching for a setting to allow it: a waste of time.

     Why not "Unrecognised protocol"?

Sincerely,

Gene Wirchenko

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#8759

On 12/1/2011 9:14 PM, Gene Wirchenko wrote:
> On Thu, 01 Dec 2011 11:53:27 +0100, Martin Honnen<mahotrash@yahoo.de>
> wrote:
>
>> Gene Wirchenko wrote:
>>> Dear JavaScripters:
>>>
>>>        The text that I am using refers to javascript: and about:
>>> protocols.  None of the examples will run on my system (IE 9 on
>>> Windows 7).
>>>
>>>        For
>>>             javascript:Date()
>>> I get nothing.
>>
>> Well where/how do you use it exactly? When I type that line into IE 9's
>> address bar and hit enter it displays the current date (e.g. Thu Dec 1
>> 11:51:52 UTC+0100 2011) in the browser window.
>
>       Exactly as you do.  When I do that, I get nothing.


Hi Gene,

Don't do that. ;-)
You can best compare the pseudoprotocol (javascript:X in an url, where X 
is some javascript command) as follows:

<a href="javascript:X;">click me to execute javascript</a>
almost equals:
<script type="text/javascript">
X
</script>

Where X is your javascript.


So, if you do this (without any pseudoprotocol):
<script type="text/javascript">
Date();
</script>

what do you expect to happen?


Regards,
Erwin Moller



-- 
"That which can be asserted without evidence, can be dismissed without 
evidence."
-- Christopher Hitchens

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#8782

On Fri, 02 Dec 2011 10:01:30 +0100, Erwin Moller
<Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> wrote:

[snip]

>Don't do that. ;-)
>You can best compare the pseudoprotocol (javascript:X in an url, where X 
>is some javascript command) as follows:
>
><a href="javascript:X;">click me to execute javascript</a>
>almost equals:
><script type="text/javascript">
>X
></script>
>
>Where X is your javascript.

>So, if you do this (without any pseudoprotocol):
><script type="text/javascript">
>Date();
></script>
>
>what do you expect to happen?

     Mr. Moller, I have RTFM.  javascript: is documented as replacing
the current document with the value generated by the code.  Yes, this
is different from a <script> code block.

     Just to be sure, I tried
          javascript:document.write(Date());
and got the same results, namely nothing.

Sincerely,

Gene Wirchenko

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#8783

In article <ucdid7hleubscelfn73lc8am6817qr69f6@4ax.com>,
 Gene Wirchenko <genew@ocis.net> wrote:

> On Fri, 02 Dec 2011 10:01:30 +0100, Erwin Moller
> <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> wrote:

> >what do you expect to happen?
> 
>      Mr. Moller, I have RTFM.  javascript: is documented as replacing
> the current document with the value generated by the code.

Documented *where* ??

> Yes, this is different from a <script> code block.
> 
>      Just to be sure, I tried
>           javascript:document.write(Date());
> and got the same results, namely nothing.

And where did you try this? In a browser's address bar, or within a 
script, or what?

-- 
Tim

"That excessive bail ought not to be required, nor excessive fines imposed,
nor cruel and unusual punishments inflicted"  --  Bill of Rights 1689

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#8784

On Fri, 02 Dec 2011 20:39:38 +0000, Tim Streater
<timstreater@greenbee.net> wrote:

>In article <ucdid7hleubscelfn73lc8am6817qr69f6@4ax.com>,
> Gene Wirchenko <genew@ocis.net> wrote:
>
>> On Fri, 02 Dec 2011 10:01:30 +0100, Erwin Moller
>> <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> wrote:
>
>> >what do you expect to happen?
>> 
>>      Mr. Moller, I have RTFM.  javascript: is documented as replacing
>> the current document with the value generated by the code.
>
>Documented *where* ??

     In my text.  I thought I found one on the Web, but I can not now.
At least one other person in-thread has stated it, too.

>> Yes, this is different from a <script> code block.
>> 
>>      Just to be sure, I tried
>>           javascript:document.write(Date());
>> and got the same results, namely nothing.
>
>And where did you try this? In a browser's address bar, or within a 
>script, or what?

     The address bar.  Before posting, it did not even occur to me to
put it in a page.

Sincerely,

Gene Wirchenko

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#8788

In article <1ohid7pebhai3ksa47bi7cpi91flu5olju@4ax.com>,
 Gene Wirchenko <genew@ocis.net> wrote:

> On Fri, 02 Dec 2011 20:39:38 +0000, Tim Streater
> <timstreater@greenbee.net> wrote:
> 
> >In article <ucdid7hleubscelfn73lc8am6817qr69f6@4ax.com>,
> > Gene Wirchenko <genew@ocis.net> wrote:
> >
> >> On Fri, 02 Dec 2011 10:01:30 +0100, Erwin Moller
> >> <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> wrote:
> >
> >> >what do you expect to happen?
> >> 
> >>      Mr. Moller, I have RTFM.  javascript: is documented as replacing
> >> the current document with the value generated by the code.
> >
> >Documented *where* ??
> 
>      In my text.  I thought I found one on the Web, but I can not now.
> At least one other person in-thread has stated it, too.
> 
> >> Yes, this is different from a <script> code block.
> >> 
> >>      Just to be sure, I tried
> >>           javascript:document.write(Date());
> >> and got the same results, namely nothing.
> >
> >And where did you try this? In a browser's address bar, or within a 
> >script, or what?
> 
>      The address bar.

Hmmm. I've not seen its use there documented, but then, to be fair, I've 
not looked as in my app, there is no address bar.

> Before posting, it did not even occur to me to put it in a page.

I use it in a couple of places in hrefs.

-- 
Tim

"That excessive bail ought not to be required, nor excessive fines imposed,
nor cruel and unusual punishments inflicted"  --  Bill of Rights 1689

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#8832

In comp.lang.javascript message <1ohid7pebhai3ksa47bi7cpi91flu5olju@4ax.
com>, Fri, 2 Dec 2011 13:56:28, Gene Wirchenko <genew@ocis.net> posted:

>
>     In my text.  I thought I found one on the Web, but I can not now.
>At least one other person in-thread has stated it, too.
>

You should not believe everything that you read on the Web or in
newsgroups.  I write with authority there; some of it I wrote myself.

-- 
 (c) John Stockton, nr London UK. replyYYWW merlyn demon co uk Turnpike 6.05.
   Web <http://www.uwasa.fi/~ts/http/tsfaq.html> -> Timo Salmi: Usenet Q&A.
   Web <http://www.merlyn.demon.co.uk/news-use.htm> :  about usage of News.
 No Encoding. Quotes precede replies. Snip well. Write clearly. Mail no News.

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#8785

On 02.12.2011 21:39, Tim Streater wrote:
> In article <ucdid7hleubscelfn73lc8am6817qr69f6@4ax.com>,
> Gene Wirchenko <genew@ocis.net> wrote:
>
>> On Fri, 02 Dec 2011 10:01:30 +0100, Erwin Moller
>> <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> wrote:
>
>> >what do you expect to happen?
>>
>> Mr. Moller, I have RTFM. javascript: is documented as replacing
>> the current document with the value generated by the code.
>
> Documented *where* ??
>
<snip>

Netscape, presumably the inventors, documented it at

http://devedge-temp.mozilla.org/library/manuals/2000/javascript/1.3/guide/advtopic.html#1004952

or already in the 'JavaScript [1.1] Guide for Navigator 3.0' accessible
at

http://web.archive.org/web/20040212093615/http://developer.netscape.com/docs/manuals/archive.html

for example - and then they got copied - and this group's FAQ mentions
that behavior (unfortunately FAQ's down at the moment at least for me).

-- 
Jake Jarvis

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#8844

Gene Wirchenko, 2011-12-01 03:28:

> Dear JavaScripters:
> 
>      The text that I am using refers to javascript: and about:
> protocols.  None of the examples will run on my system (IE 9 on
> Windows 7).
> 
>      For
>           javascript:Date()
> I get nothing.  For
>           about:cache
> and
>           about:plugins
> I get a message of "Navigation to the webpage was canceled / What you
> can try: / - Retype the address."
> 
>      I have looked for settings to enable these and have found
> nothing.  What am I missing, please?

"about:" is not a "protocol" and are no standard either. So don't expect
this to work universally in any browser.

Using "javascript:" is also a bad idea - better implement an event
handler for user interaction.



-- 
Arno Welzel
http://arnowelzel.de
http://de-rec-fahrrad.de

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#8917

Gene Wirchenko wrote:
>       For
>            javascript:Date()

This does not have to work unless you use window.alert() or
document.write().

Some browsers support just "javascript:Date()" - they are being
user-friendly, that's all.


> I get nothing.  For
>            about:cache
> and
>            about:plugins

These would work in Opera/Firefox. I don't think IE ever supported them.

-- 
Bwig Zomberi

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