Pass Parameters to Java Script?

[Al Franz]

Anyone understand how to pass parameters to a JavaScript. If anyone finds
this easy to do maybe they could take a look at my short script on this page
and show me how it needs to be changed.

http://franz.org/java.htm

Thanks for any help.

[Laurent Bugnion, GalaSoft]

Re: Pass Parameters to Java Script?

Hi,

Al Franz wrote:[color=blue]
> Anyone understand how to pass parameters to a JavaScript. If anyone finds
> this easy to do maybe they could take a look at my short script on this page
> and show me how it needs to be changed.
>
> http://franz.org/java.htm
>
> Thanks for any help.[/color]

The page doesn't work.

I assume that you are talking about passing parameters from Java to
JavaScript, since you post in comp.lang.java. javascript. If it is so,
then you should check

http://www.galasoft-LB.ch/myjavascript/consulting/LiveConnect102

HTH,

Laurent
--
Laurent Bugnion, GalaSoft
Webdesign, Java, JavaScript: http://www.galasoft-LB.ch
Private/Malaysia: http://mypage.bluewin.ch/lbugnion
Support children in Calcutta: http://www.calcutta-espoir.ch

[Al Franz]

Re: Pass Parameters to Java Script?

Actually what I want to do is pass parameters from my HTML code to the
JavaScript. Not sure why the web page does not work for you, are others
having problems? Maybe it had a hiccup?

[Mark]

Re: Pass Parameters to Java Script?


"Al Franz" <albert@netmati on.com> wrote in message
news:IzVZa.1237 01$YN5.85449@sc crnsc01...[color=blue]
> Anyone understand how to pass parameters to a JavaScript. If anyone finds
> this easy to do maybe they could take a look at my short script on this[/color]
page[color=blue]
> and show me how it needs to be changed.
>
> http://franz.org/java.htm
>
> Thanks for any help.
>
>[/color]

Add additional parameters to the function call:
<A HREF="javascrip t:launch('photo/2003047.jpg', 500, 300)">

Then, in your function:
function launch(url, wdth, hght) {
remote =
open(url,'','re sizable=yes,scr ollbars=yes,too lbar=no,locatio n=no,directorie s
=no,status=no,m enubar=no,copyh istory=no,width =wdth,height=hg ht');
}

No difference between passing 1 (url) and 3 (url, height, width)-- pass more
if you like.

HTH

[Laurent Bugnion, GalaSoft]

Re: Pass Parameters to Java Script?

Hi,

Mark wrote:[color=blue]
> "Al Franz" <albert@netmati on.com> wrote in message
> news:IzVZa.1237 01$YN5.85449@sc crnsc01...
>[color=green]
>>Anyone understand how to pass parameters to a JavaScript. If anyone finds
>>this easy to do maybe they could take a look at my short script on this[/color]
>
> page
>[color=green]
>>and show me how it needs to be changed.
>>
>>http://franz.org/java.htm
>>
>>Thanks for any help.
>>
>>[/color]
>
>
> Add additional parameters to the function call:
> <A HREF="javascrip t:launch('photo/2003047.jpg', 500, 300)">
>
> Then, in your function:
> function launch(url, wdth, hght) {
> remote =
> open(url,'','re sizable=yes,scr ollbars=yes,too lbar=no,locatio n=no,directorie s
> =no,status=no,m enubar=no,copyh istory=no,width =wdth,height=hg ht');
> }
>
> No difference between passing 1 (url) and 3 (url, height, width)-- pass more
> if you like.
>
> HTH[/color]

For various reasons (see the FAQ of comp.lang.javas cript), you should
never use the pseudo-protocol "javascript :".

The best way is to use the ONCLICK event handler, and to use the SRC
attribute to specify an action which will be executed only if JavaScript
is not enabled (if you return false in the ONCLICK event handler).

Example:

<A HREF="nojs.html "
ONCLICK="myMeth od();return false;">
Text</A>

nojs.html being a page handling the case where the user doesn't have
JavaScript.

Laurent
--
Laurent Bugnion, GalaSoft
Webdesign, Java, JavaScript: http://www.galasoft-LB.ch
Private/Malaysia: http://mypage.bluewin.ch/lbugnion
Support children in Calcutta: http://www.calcutta-espoir.ch

[Laurent Bugnion, GalaSoft]

Re: Pass Parameters to Java Script?

Actually, the script you propose doesn't work. See correction under.

Mark wrote:[color=blue]
> "Al Franz" <albert@netmati on.com> wrote in message
> news:IzVZa.1237 01$YN5.85449@sc crnsc01...
>[color=green]
>>Anyone understand how to pass parameters to a JavaScript. If anyone finds
>>this easy to do maybe they could take a look at my short script on this[/color]
>
> page
>[color=green]
>>and show me how it needs to be changed.
>>
>>http://franz.org/java.htm
>>
>>Thanks for any help.
>>
>>[/color]
>
>
> Add additional parameters to the function call:
> <A HREF="javascrip t:launch('photo/2003047.jpg', 500, 300)">
>
> Then, in your function:[/color]

Should be:

function launch( url, wdth, hght )
{
remote = open( url, "WindowName ",
'resizable,scro llbars,width='
+ wdth + ',height=' + hght );
}

What I did is

1) Give a name to the window. A window should always have a unique name,
to avoid nasty side effects.

2) Remove all the parameters which are set to "no" in the open method.
Parameters are set to "no" per default. It's not wrong to mention them,
but it's not useful.

3) wdth and hght are parameters, thus the string should be constructed
using the concatenation operator '+'.

HTH,

Laurent
--
Laurent Bugnion, GalaSoft
Webdesign, Java, JavaScript: http://www.galasoft-LB.ch
Private/Malaysia: http://mypage.bluewin.ch/lbugnion
Support children in Calcutta: http://www.calcutta-espoir.ch

[Al Franz]

Re: Pass Parameters to Java Script?

Laurent,

Thank you very much, it is looking better but have a few follow up
questions. I implemented what you said at, even though I kept 2 "no"
parameters in there in case I change those....

http://franz.org/java.htm

1. Can I put the WindowName as a parameter in the HTML, since currently I
have to close a popup before opening a new one since the old parameters will
stick. Should it be in quotes in my HTML, and setup the same as wdth and
hght ?

2. Any way to set a background color for the frame in the window that pops
up?

3. Finnaly the wdth and hght I used as a parameter is the actual photo width
+ 20 pixels and the actual photo height + 30 pixels. Would it be possible
to hard code the 20 and 30 in the script so I could put the actual photo
dimensions in the HTML code parameters.

Thanks again, any help with me finishing up these mods would be great.

--Al

[Mark]

Re: Pass Parameters to Java Script?


[Original message clipped for brevity][color=blue]
>
> http://franz.org/java.htm
>
> 1. Can I put the WindowName as a parameter in the HTML, since currently I
> have to close a popup before opening a new one since the old parameters[/color]
will[color=blue]
> stick. Should it be in quotes in my HTML, and setup the same as wdth and
> hght ?[/color]

Yes, I mentioned you may pass the function any reasonable number of
arguements. Window name would be an arguement. Use it as you would any
other-- string arguements are passed in quotes, but do not quote the dummy
variable.
[color=blue]
>
> 2. Any way to set a background color for the frame in the window that pops
> up?[/color]

Hmmm... Not sure on this one. I suspect not-- as you are not actually
opening a document, but rather only an image. if your 'url' was an HTML
document, you could set the background color as in any other document.
Perhaps someone else will know better, or perhaps changing the 'url'
variable to an actual page containing the image is the only way.
[color=blue]
>
> 3. Finnaly the wdth and hght I used as a parameter is the actual photo[/color]
width[color=blue]
> + 20 pixels and the actual photo height + 30 pixels. Would it be possible
> to hard code the 20 and 30 in the script so I could put the actual photo
> dimensions in the HTML code parameters.
>[/color]

Yes. In the opener function add +20 and +30 to the variables describing
height and width.

[color=blue]
> Thanks again, any help with me finishing up these mods would be great.
>
> --Al[/color]

Also, my thanks to Laurent Bugnion for 'fleshing out' my answers-- and my
understanding.

Mark[color=blue]
>
>[/color]

[Al Franz]

Re: Pass Parameters to Java Script?

Tried adding that 20 and 30 every which way I could, but doesn't seem to
work. What is wrong with this format???


<SCRIPT language=javasc ript>
function launch4( url, wdth, hght)
{
remote = open( url, "WindowName ",
'resizeable=no, scrollbars=no,w idth='
+ wdth+20 + ',height='+ hght+30 );
}
</SCRIPT>


"Mark" <none@given.com > wrote in message
news:y5f_a.9005 5$Vt6.28698@rwc rnsc52.ops.asp. att.net...[color=blue]
>
> [Original message clipped for brevity][color=green]
> >
> > http://franz.org/java.htm
> >
> > 1. Can I put the WindowName as a parameter in the HTML, since currently[/color][/color]
I[color=blue][color=green]
> > have to close a popup before opening a new one since the old parameters[/color]
> will[color=green]
> > stick. Should it be in quotes in my HTML, and setup the same as wdth[/color][/color]
and[color=blue][color=green]
> > hght ?[/color]
>
> Yes, I mentioned you may pass the function any reasonable number of
> arguements. Window name would be an arguement. Use it as you would any
> other-- string arguements are passed in quotes, but do not quote the dummy
> variable.
>[color=green]
> >
> > 2. Any way to set a background color for the frame in the window that[/color][/color]
pops[color=blue][color=green]
> > up?[/color]
>
> Hmmm... Not sure on this one. I suspect not-- as you are not actually
> opening a document, but rather only an image. if your 'url' was an HTML
> document, you could set the background color as in any other document.
> Perhaps someone else will know better, or perhaps changing the 'url'
> variable to an actual page containing the image is the only way.
>[color=green]
> >
> > 3. Finnaly the wdth and hght I used as a parameter is the actual photo[/color]
> width[color=green]
> > + 20 pixels and the actual photo height + 30 pixels. Would it be[/color][/color]
possible[color=blue][color=green]
> > to hard code the 20 and 30 in the script so I could put the actual photo
> > dimensions in the HTML code parameters.
> >[/color]
>
> Yes. In the opener function add +20 and +30 to the variables describing
> height and width.
>
>[color=green]
> > Thanks again, any help with me finishing up these mods would be great.
> >
> > --Al[/color]
>
> Also, my thanks to Laurent Bugnion for 'fleshing out' my answers-- and my
> understanding.
>
> Mark[color=green]
> >
> >[/color]
>
>[/color]

[Harlan Messinger]

Re: Pass Parameters to Java Script?


"Laurent Bugnion, GalaSoft" <galasoft-LB@bluewin_NO_S PAM.ch> wrote in
message news:3F391B7F.3 030106@bluewin_ NO_SPAM.ch...[color=blue]
>
> For various reasons (see the FAQ of comp.lang.javas cript), you should
> never use the pseudo-protocol "javascript :".[/color]

Is anyone imagined to be able to find anything in this "FAQ"? At
www.faqs.org is a "meta-FAQ" that points to a supposed "FAQ" at
http://developer.irt.org/script/script.htm -- but go ahead and try to figure
out where any information is located there about the pseudo-protocol
"javascript :".

Anyway, I've never come across this admonition, and I don't know why not to
use "javascript :". Several years of experience with it has turned up no
direct evidence of a problem. Can you fill us in?

[Jim Dabell]

Re: Pass Parameters to Java Script?

Harlan Messinger wrote:
[color=blue]
>
> "Laurent Bugnion, GalaSoft" <galasoft-LB@bluewin_NO_S PAM.ch> wrote in
> message news:3F391B7F.3 030106@bluewin_ NO_SPAM.ch...[color=green]
>>
>> For various reasons (see the FAQ of comp.lang.javas cript), you should
>> never use the pseudo-protocol "javascript :".[/color]
>
> Is anyone imagined to be able to find anything in this "FAQ"? At
> www.faqs.org is a "meta-FAQ" that points to a supposed "FAQ" at
> http://developer.irt.org/script/script.htm -- but go ahead and try to
> figure out where any information is located there about the
> pseudo-protocol "javascript :".[/color]

Google: type in comp.lang.java. javascript faq. The very first hit leads you
to the comp.lang.javas cript FAQ (scroll down to "Javascript newsgroups").
See 4.24: I have <a href="javascrip t:somefunction( )"> what ... ?

[color=blue]
> Anyway, I've never come across this admonition, and I don't know why not
> to use "javascript :". Several years of experience with it has turned up no
> direct evidence of a problem. Can you fill us in?[/color]

The biggest problem with it is that it is useless in situations where
Javascript is not available. Even when it is available, it's problematic.

I find it extremely annoying to middle-click on a link to open it in a new
window, switch back to the original window immediately, carry on reading
that page, close it, and discover that the "link" wasn't a proper link at
all, and you are left with a blank page. This typically happens to me when
the author decided that the link _absolutely must_ open in a new window,
which just adds to the annoyance - it's like I am being punished for
operating my browser correctly.


--
Jim Dabell

[Harlan Messinger]

Re: Pass Parameters to Java Script?


"Jim Dabell" <jim-usenet@jimdabel l.com> wrote in message
news:Z4CdnfQ7Kr U52aeiXTWQkQ@gi ganews.com...[color=blue]
> Harlan Messinger wrote:
>[color=green]
> >
> > "Laurent Bugnion, GalaSoft" <galasoft-LB@bluewin_NO_S PAM.ch> wrote in
> > message news:3F391B7F.3 030106@bluewin_ NO_SPAM.ch...[color=darkred]
> >>
> >> For various reasons (see the FAQ of comp.lang.javas cript), you should
> >> never use the pseudo-protocol "javascript :".[/color]
> >
> > Is anyone imagined to be able to find anything in this "FAQ"? At
> > www.faqs.org is a "meta-FAQ" that points to a supposed "FAQ" at
> > http://developer.irt.org/script/script.htm -- but go ahead and try to
> > figure out where any information is located there about the
> > pseudo-protocol "javascript :".[/color]
>
> Google: type in comp.lang.java. javascript faq. The very first hit leads[/color]
you[color=blue]
> to the comp.lang.javas cript FAQ (scroll down to "Javascript newsgroups").
> See 4.24: I have <a href="javascrip t:somefunction( )"> what ... ?
>
>[color=green]
> > Anyway, I've never come across this admonition, and I don't know why not
> > to use "javascript :". Several years of experience with it has turned up[/color][/color]
no[color=blue][color=green]
> > direct evidence of a problem. Can you fill us in?[/color]
>
> The biggest problem with it is that it is useless in situations where
> Javascript is not available.[/color]

<snicker> In those cases the ONCLICK is going to be *real* helpful.
[color=blue]
> Even when it is available, it's problematic.
>
> I find it extremely annoying to middle-click on a link to open it in a new
> window, switch back to the original window immediately, carry on reading
> that page, close it, and discover that the "link" wasn't a proper link at
> all, and you are left with a blank page. This typically happens to me[/color]
when[color=blue]
> the author decided that the link _absolutely must_ open in a new window,
> which just adds to the annoyance - it's like I am being punished for
> operating my browser correctly.[/color]

This has nothing to do with using "javascript :" in an HREF. You're
complaining about a particular *action* that some site editors associate
with a link.

[Jim Dabell]

Re: Pass Parameters to Java Script?

Harlan Messinger wrote:
[color=blue]
> "Jim Dabell" <jim-usenet@jimdabel l.com> wrote in message
> news:Z4CdnfQ7Kr U52aeiXTWQkQ@gi ganews.com...[/color]
[snip][color=blue][color=green]
>> The biggest problem with it is that it is useless in situations where
>> Javascript is not available.[/color]
>
> <snicker> In those cases the ONCLICK is going to be *real* helpful.[/color]

No, but the href attribute will be, won't it? Or were you planning on
having a link without an href attribute?

[color=blue][color=green]
>> I find it extremely annoying to middle-click on a link to open it in a
>> new window, switch back to the original window immediately, carry on
>> reading that page, close it, and discover that the "link" wasn't a proper
>> link at all, and you are left with a blank page. This typically happens
>> to me when the author decided that the link _absolutely must_ open in a
>> new window, which just adds to the annoyance - it's like I am being
>> punished for operating my browser correctly.[/color]
>
> This has nothing to do with using "javascript :" in an HREF.[/color]

It's the root cause of the problem. I don't see how you can argue
otherwise. If a normal link was used, it wouldn't break in this situation.

[color=blue]
> You're complaining about a particular *action* that some site editors
> associate with a link.[/color]

No, the href attribute is the defining quality of a link. There's only one
defined instance where the context of the link matters in HTML, and that is
with relative URLs. The javascript: style links can be context-free, which
is the cause of the problem - openFancyWindow (); is meaningless in a new
window.

While an "open in a new window" link that is implemented using events is
annoying, it's nowhere near as annoying as the fundamentally broken
javascript: problem.

--
Jim Dabell

[Richard Cornford]

Re: Pass Parameters to Java Script?

"Harlan Messinger" <h.messinger@co mcast.net> wrote in message
news:bhdtd7$111 769$1@ID-114100.news.uni-berlin.de...[color=blue]
>"Jim Dabell" <jim-usenet@jimdabel l.com> wrote in message
>news:Z4CdnfQ7K rU52aeiXTWQkQ@g iganews.com...[color=green]
>> Harlan Messinger wrote:[/color][/color]
<snip>[color=blue][color=green][color=darkred]
>>>Anyway, I've never come across this admonition, and I don't
>>>know why not to use "javascript :". Several years of experience
>>>with it has turned up no direct evidence of a problem. Can you
>>>fill us in?[/color]
>>
>>The biggest problem with it is that it is useless in situations
>>where Javascript is not available.[/color]
>
><snicker> In those cases the ONCLICK is going to be *real* helpful.[/color]
<snip>

The point is not that the onclick event is usable if JavaScript is
disabled, it is that there is a one to one relationship between
JavaScript being available and enabled and the execution of onclick
code. While a javascript: pseudo protocol href is still an href even if
JavaScript is not available; If JavaScript is unavailable the result of
clicking on the link is unpredictable but will always be unhelpful.
Conversely, an onclick handler can cancel the navigation specified by a
real URL in the href, and when JavaScript is not available (or the
browser lacks the features required by the script) the URL in the href
provides a natural and reliable path of clean degradation.

But the consequences of the use of the javascript: pseudo-protocol when
JavaScript is unavailable are not to only reason for not using it. Some
browsers (and this depends a lot on browser type, version and OS) treat
the user clicking on a link as navigation (if not cancelled by an
onclick handler) and navigation is taken to mean that the current page
is finished with. They start to shut down resource hungry activity on
the current page (waiting for it to be replaced). The most commonly
observed manifestation of this (because it happens on Windows OS with
some IE versions) is that once a javascript: pseudo-protocol link is
clicked animated GIF images stop being animated. There are other
manifestations and Mac and Linux browsers seem generally more
susceptible than Window browsers.

Exactly which (if any) resources will vanish when a javascript:
pseudo-protocol link is clicked (and on which browser versions and OSs)
is not well documented but it is known with 100% certainty that the
whole problem can be avoided on all current browsers by exclusively
using onclick handlers when the desire is to execute JavaScript as a
consequence of clicking on a link.

Section 2.24 of the comp.lang.javas cript FAQ may be mostly motivated by
a desire to provide clean degradation in a JavaScript incapable
environment but that is not the only reason that it includes such a
blanket injunction against the use of the javascript: pseudo-protocol in
href attributes.

Richard.