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Xia __

2006-Sep-06 08:06 UTC

Swap CSS

I''d like a button that will reload the current controller/action/view 
but with an alternative CSS (eg, Print Version and Large Text Version).

Has anyone done this in Rails and if so are you able to provide me with 
your code?

Thanks

-- 
Posted via http://www.ruby-forum.com/.

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Pete Wright

2006-Sep-06 12:07 UTC

head link

Re: Swap CSS

Presumably, the easiest way to do this would be to have some session  
value, or an instance variable, hold the stylesheet choice and  
reference that in the layout....

<%= stylesheet_link_tag "#{session[:stylesheet]}" %>

Your button, when clicked, would simply update this session value.


--------------------------------------------------
Peter Wright
froogle-jY3Lu0o19T39IxVxf2VSKA@public.gmane.org

Personal Blog -> http://peterwright.blogspot.com
Agile Development Blog -> http://exceeding-expectations.blogspot.com




On 6 Sep 2006, at 04:06, Xia __ wrote:
> I''d like a button that will reload the current
controller/action/view
> but with an alternative CSS (eg, Print Version and Large Text  
> Version).
>
> Has anyone done this in Rails and if so are you able to provide me  
> with
> your code?
>
> Thanks
>
> -- 
> Posted via http://www.ruby-forum.com/.
>
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Long

2006-Sep-06 15:23 UTC

head link

Re: Swap CSS

Perhaps #{params[:style]} may work better as you can link to it quite
easily.

Long

----- Original Message ----- 
From: "Pete Wright"
<froogle-jY3Lu0o19T2Bik42HM7KXg@public.gmane.org>
To: <rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Sent: Wednesday, September 06, 2006 8:07 AM
Subject: [Rails] Re: Swap CSS

> Presumably, the easiest way to do this would be to have some session  
> value, or an instance variable, hold the stylesheet choice and  
> reference that in the layout....
> 
> <%= stylesheet_link_tag "#{session[:stylesheet]}" %>
> 
> Your button, when clicked, would simply update this session value.
> 
> 
> --------------------------------------------------
> Peter Wright
> froogle-jY3Lu0o19T39IxVxf2VSKA@public.gmane.org
> 
> Personal Blog -> http://peterwright.blogspot.com
> Agile Development Blog -> http://exceeding-expectations.blogspot.com
> 
> 
> 
> 
> On 6 Sep 2006, at 04:06, Xia __ wrote:
> 
> > I''d like a button that will reload the current
controller/action/view
> > but with an alternative CSS (eg, Print Version and Large Text  
> > Version).
> >
> > Has anyone done this in Rails and if so are you able to provide me  
> > with
> > your code?
> >
> > Thanks
> >

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Pete Wright

2006-Sep-06 15:53 UTC

head link

Re: Swap CSS

But if we''re talking about a stylesheet applied to a layout used in  
all pages of the app, wouldn''t params make things a little tricky?

--------------------------------------------------
Peter Wright
froogle-jY3Lu0o19T39IxVxf2VSKA@public.gmane.org

Personal Blog -> http://peterwright.blogspot.com
Agile Development Blog -> http://exceeding-expectations.blogspot.com




On 6 Sep 2006, at 11:23, Long wrote:
> Perhaps #{params[:style]} may work better as you can link to it quite
> easily.
>
> Long
>
> ----- Original Message -----
> From: "Pete Wright"
<froogle-jY3Lu0o19T2Bik42HM7KXg@public.gmane.org>
> To: <rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> Sent: Wednesday, September 06, 2006 8:07 AM
> Subject: [Rails] Re: Swap CSS
>
>
>> Presumably, the easiest way to do this would be to have some session
>> value, or an instance variable, hold the stylesheet choice and
>> reference that in the layout....
>>
>> <%= stylesheet_link_tag "#{session[:stylesheet]}" %>
>>
>> Your button, when clicked, would simply update this session value.
>>
>>
>> --------------------------------------------------
>> Peter Wright
>> froogle-jY3Lu0o19T39IxVxf2VSKA@public.gmane.org
>>
>> Personal Blog -> http://peterwright.blogspot.com
>> Agile Development Blog -> http://exceeding-expectations.blogspot.com
>>
>>
>>
>>
>> On 6 Sep 2006, at 04:06, Xia __ wrote:
>>
>>> I''d like a button that will reload the current
controller/action/
>>> view
>>> but with an alternative CSS (eg, Print Version and Large Text
>>> Version).
>>>
>>> Has anyone done this in Rails and if so are you able to provide me
>>> with
>>> your code?
>>>
>>> Thanks
>>>
>
>
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James Ludlow

2006-Sep-06 16:07 UTC

head link

Re: Swap CSS

On 9/6/06, Pete Wright <froogle-jY3Lu0o19T2Bik42HM7KXg@public.gmane.org>
wrote:>
> Presumably, the easiest way to do this would be to have some session value,
> or an instance variable, hold the stylesheet choice and reference that in
> the layout....
>
> <%= stylesheet_link_tag "#{session[:stylesheet]}" %>
>
> Your button, when clicked, would simply update this session value.
You could set it in a cookie too, so that the user gets his choice of
styles back automatically.

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Stephen Bartholomew

2006-Sep-06 16:29 UTC

head link

Re: Swap CSS

> But if we''re talking about a stylesheet applied to a layout used
in all
> pages of the app, wouldn''t params make things a little tricky?It''d make it very tricky.

I''d say have a StylesController with a ''switch''
method

class StylesController < ApplicationController
   def switch
     if params[:style]
       session[:stylesheet] = params[:style]
     end
   end
end

Then a nice route:

map.connect ''/style/switch/:style/''

to make urls like this:

/style/switch/print
or
/style/switch/large_text

Then in the layout:

<%= stylesheet_link_tag session[:stylesheet] || "my_default" %>

As long as you name your stylesheets print.css or large_text.css
they''ll
be picked up. If nothing is specified, your default stylesheet will be 
loaded.

Hope that helps,

Steve

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Ezra Zygmuntowicz

2006-Sep-06 17:02 UTC

head link

Re: Swap CSS

On Sep 6, 2006, at 9:07 AM, James Ludlow wrote:
>
> On 9/6/06, Pete Wright
<froogle-jY3Lu0o19T2Bik42HM7KXg@public.gmane.org> wrote:
>>
>> Presumably, the easiest way to do this would be to have some  
>> session value,
>> or an instance variable, hold the stylesheet choice and reference  
>> that in
>> the layout....
>>
>> <%= stylesheet_link_tag "#{session[:stylesheet]}" %>
>>
>> Your button, when clicked, would simply update this session value.
>
> You could set it in a cookie too, so that the user gets his choice of
> styles back automatically.
>
	The nice way to do this IMHO is to use alternate style sheet tags  
and a little js to set a cookie. That way you can switch the  
stylesheet without reloading the page. Something like this:

In the head of your layout:

   <link href="/stylesheets/main.css" rel="stylesheet"
type="text/
css" title="main" />
   <link rel="alternate stylesheet" type="text/css"
href="/
stylesheets/print.css" title="print" />
   <link rel="alternate stylesheet" type="text/css"
href="/
stylesheets/largetext.css" title="largetext" />
   <script type="text/javascript" src="/javascripts/ 
style_switch.js"></script>

The links to change the stylesheet:

<a href="#"
onclick="setActiveStyleSheet(''main'');return
false;">Main</a>
<a href="#"
onclick="setActiveStyleSheet(''print'');return
false;">Print</a>
<a href="#"
onclick="setActiveStyleSheet(''largetext'');return
false;">Large Text</a>

And the style_switch.js file:

function setActiveStyleSheet(title) {
   var i, a, main;
   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
     if(a.getAttribute("rel").indexOf("style") != -1
&& a.getAttribute
("title")) {
       a.disabled = true;
       if(a.getAttribute("title") == title) a.disabled = false;
     }
   }
}

function getActiveStyleSheet() {
   var i, a;
   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
     if(a.getAttribute("rel").indexOf("style") != -1
&& a.getAttribute
("title") && !a.disabled) return
a.getAttribute("title");
   }
   return null;
}

function getPreferredStyleSheet() {
   var i, a;
   for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
     if(a.getAttribute("rel").indexOf("style") != -1
        && a.getAttribute("rel").indexOf("alt") ==
-1
        && a.getAttribute("title")
        ) return a.getAttribute("title");
   }
   return null;
}

function createCookie(name,value,days) {
   if (days) {
     var date = new Date();
     date.setTime(date.getTime()+(days*24*60*60*1000));
     var expires = "; expires="+date.toGMTString();
   }
   else expires = "";
   document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
   var nameEQ = name + "=";
   var ca = document.cookie.split('';'');
   for(var i=0;i < ca.length;i++) {
     var c = ca[i];
     while (c.charAt(0)=='' '') c = c.substring(1,c.length);
     if (c.indexOf(nameEQ) == 0) return c.substring 
(nameEQ.length,c.length);
   }
   return null;
}

window.onload = function(e) {
   var cookie = readCookie("style");
   var title = cookie ? cookie : getPreferredStyleSheet();
   setActiveStyleSheet(title);
}

window.onunload = function(e) {
   var title = getActiveStyleSheet();
   createCookie("style", title, 365);
}

var cookie = readCookie("style");
var title = cookie ? cookie : getPreferredStyleSheet();
setActiveStyleSheet(title);



Cheers-
-Ezra

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Cayce Balara

2006-Sep-06 17:07 UTC

head link

Re: Swap CSS

You might also want to check out the details of the media attribute for 
stylesheet link tags - http://www.w3schools.com/css/css_mediatypes.asp.

A stylesheet linked with media=print will be used for printing, whether 
the page is reloaded in the browser using that stylesheet or not. It''s
a
nice feature - you create two stylesheets, page looks great on screen, 
page looks great on paper, user doesn''t have to do anything except hit 
the print button in the browser.

Not sure how to apply to your Large Text idea, but again - just and fyi 
on something else you might want to look into.

c.

Xia __ wrote:> I''d like a button that will reload the current
controller/action/view
> but with an alternative CSS (eg, Print Version and Large Text Version).
> 
> Has anyone done this in Rails and if so are you able to provide me with 
> your code?
> 
> Thanks

-- 
Posted via http://www.ruby-forum.com/.

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Long

2006-Sep-06 17:11 UTC

head link

Re: Swap CSS

Hmm, you are right. I got a bit ahead of myself there.

The approach I would take is to add a before_filter. It would
check params for a "new" style and set the value in the session,
like you''ve suggested.

Now one can construct links to switch styles with ease.

Long


----- Original Message ----- 
From: "Pete Wright"
<froogle-jY3Lu0o19T2Bik42HM7KXg@public.gmane.org>
To: <rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Sent: Wednesday, September 06, 2006 11:53 AM
Subject: [Rails] Re: Swap CSS

> But if we''re talking about a stylesheet applied to a layout used
in
> all pages of the app, wouldn''t params make things a little tricky?
> 
> --------------------------------------------------
> Peter Wright
> froogle-jY3Lu0o19T39IxVxf2VSKA@public.gmane.org
> 
> Personal Blog -> http://peterwright.blogspot.com
> Agile Development Blog -> http://exceeding-expectations.blogspot.com
> 
> 
> 
> 
> On 6 Sep 2006, at 11:23, Long wrote:
> 
> > Perhaps #{params[:style]} may work better as you can link to it quite
> > easily.
> >
> > Long
> >
> > ----- Original Message -----
> > From: "Pete Wright"
<froogle-jY3Lu0o19T2Bik42HM7KXg@public.gmane.org>
> > To: <rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> > Sent: Wednesday, September 06, 2006 8:07 AM
> > Subject: [Rails] Re: Swap CSS
> >
> >
> >> Presumably, the easiest way to do this would be to have some
session
> >> value, or an instance variable, hold the stylesheet choice and
> >> reference that in the layout....
> >>
> >> <%= stylesheet_link_tag "#{session[:stylesheet]}"
%>
> >>
> >> Your button, when clicked, would simply update this session value.
> >>
> >>
> >> --------------------------------------------------
> >> Peter Wright
> >> froogle-jY3Lu0o19T39IxVxf2VSKA@public.gmane.org
> >>
> >> Personal Blog -> http://peterwright.blogspot.com
> >> Agile Development Blog ->
http://exceeding-expectations.blogspot.com
> >>
> >>
> >>
> >>
> >> On 6 Sep 2006, at 04:06, Xia __ wrote:
> >>
> >>> I''d like a button that will reload the current
controller/action/
> >>> view
> >>> but with an alternative CSS (eg, Print Version and Large Text
> >>> Version).
> >>>
> >>> Has anyone done this in Rails and if so are you able to
provide me
> >>> with
> >>> your code?
> >>>
> >>> Thanks
> >>>

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Gregory Seidman

2006-Sep-06 17:18 UTC

head link

Re: Swap CSS

On Wed, Sep 06, 2006 at 10:06:19AM +0200, Xia __ wrote:
} I''d like a button that will reload the current controller/action/view
} but with an alternative CSS (eg, Print Version and Large Text Version).
} 
} Has anyone done this in Rails and if so are you able to provide me with 
} your code?

This is the wrong approach, both for efficiency and for the convenience of
the user. It is preferable to serve up CSS only once and have the client
browser cache it, even if that means sending more CSS the first time.
Within reason, it is worthwhile to trade larger data sends for fewer HTTP
connections (i.e. send more CSS at once so you don''t have to send
another
chunk later).

The way to go about this is to have all of your CSS rooted at
body.class_name and have a different class name for each style. Changing
styles can be done in JavaScript by just changing the class of the body
tag, which improves the user experience as well (no page refresh to get a
new style).

Of course, to work with browsers that have JavaScript turned off (and to
support saving a user''s preferred style) you need to have the
class="class_name" of the body tag in a conditional in your view, and
grab
that class_name from the params, the session, or stored user data. Your
"change style" link/button/whatever needs to do a page refresh with
the
right style param unless JavaScript intervenes and just changes the body
class on the fly.

To make this clearer, I''ll give an example:

<html><head>
<title>Foo</title>
<script src="javascripts/prototype.js"></script>
<script>
Event.observe(window, ''load'', function() {
	var select = $(''style_choice'');
	var body = document.getElementsByTagName(''body'')[0];
	$(''hideme'').className = ''hidden'';
	Event.observe(select, ''change'', function() {
		body.className = select.value;
	});
});
</script>
<style type="text/css">
.hidden { display: none; } 
#content { /* default theme */
	background-color: #EEEEEE;
	color: black;
	width: 20em;
	padding: 3ex;
	text-align: center;
}
body.green_theme #content {
	background-color: #99FF99;
	color: black;
}
body.blue_theme #content {
	background-color: #9999FF;
	color: black;
}
body.christmas #content {
	background-color: green;
	color: red;
}

</style>
</head><body>

<div id="content">The quick brown fox jumps over the lazy
dog.</div>
<form id="change_style">
<select name="style" id="style_choice">
<option value="">Default</option>
<option value="green_theme">Green</option>
<option value="blue_theme">Blue</option>
<option value="christmas">Merry Christmas!</option>
</select>
<input type="submit" id="hideme" value="Change
style" />
</form>
</body></html>

Note that the inline CSS should really be in a separate static file. Also
note that the JavaScript depends on Prototype. There is a certain lack of
cleanliness to this since it''s just an example, but I did test it with
Firefox.

} Thanks
--Greg


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Jeff Pritchard

2006-Oct-15 07:14 UTC

head link

Re: Swap CSS

Ezra Zygmuntowicz wrote:> On Sep 6, 2006, at 9:07 AM, James Ludlow wrote:
> 
>>>
>>> Your button, when clicked, would simply update this session value.
>>
>> You could set it in a cookie too, so that the user gets his choice of
>> styles back automatically.
>>
> 
> 	The nice way to do this IMHO is to use alternate style sheet tags
> and a little js to set a cookie. That way you can switch the
> stylesheet without reloading the page. Something like this:
> 
> In the head of your layout:
> 
>    <link href="/stylesheets/main.css"
rel="stylesheet" type="text/
> css" title="main" />
>    <link rel="alternate stylesheet" type="text/css"
href="/
> stylesheets/print.css" title="print" />
>    <link rel="alternate stylesheet" type="text/css"
href="/
> stylesheets/largetext.css" title="largetext" />
>    <script type="text/javascript" src="/javascripts/
> style_switch.js"></script>
> 
> The links to change the stylesheet:
> 
> <a href="#"
onclick="setActiveStyleSheet(''main'');return
false;">Main</a>
> <a href="#"
onclick="setActiveStyleSheet(''print'');return
> false;">Print</a>
> <a href="#"
onclick="setActiveStyleSheet(''largetext'');return
> false;">Large Text</a>
> 
> And the style_switch.js file:
> 
> function setActiveStyleSheet(title) {
>    var i, a, main;
>    for(i=0; (a = document.getElementsByTagName("link")[i]); i++)
{
>      if(a.getAttribute("rel").indexOf("style") != -1
&& a.getAttribute
> ("title")) {
>        a.disabled = true;
>        if(a.getAttribute("title") == title) a.disabled = false;
>      }
>    }
> }
> 
> function getActiveStyleSheet() {
>    var i, a;
>    for(i=0; (a = document.getElementsByTagName("link")[i]); i++)
{
>      if(a.getAttribute("rel").indexOf("style") != -1
&& a.getAttribute
> ("title") && !a.disabled) return
a.getAttribute("title");
>    }
>    return null;
> }
> 
> function getPreferredStyleSheet() {
>    var i, a;
>    for(i=0; (a = document.getElementsByTagName("link")[i]); i++)
{
>      if(a.getAttribute("rel").indexOf("style") != -1
>         && a.getAttribute("rel").indexOf("alt")
== -1
>         && a.getAttribute("title")
>         ) return a.getAttribute("title");
>    }
>    return null;
> }
> 
[snip]> Cheers-
> -Ezra

I like Ezra''s basic approach to this, but I''m wondering if it
can be
done in a more "Railsy way", with less javascript and perhaps using
Ajax.  Is there a way I can enable/disable the appropriate link elements
with a render :update (or a rjs file)?

I''m looking to use radio buttons for the "style selection",
and then use
an "observe_form" to watch the radio buttons and call an ajax action
that will then do the enabling/disabling of the various CSS links and
also save the new selection to the session variable.

This is all working except that I don''t know how to "get at"
the link
elements in my rjs.

thanks,
jp

-- 
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Bill

2006-Oct-15 10:03 UTC

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Re: Swap CSS

I think a smell a CSS/JS switcher plugin or at least a recipe.

Any takers?

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Xia __

2006-Oct-15 10:38 UTC

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Re: Swap CSS

Hey Good Idea!

I was thinking the conditional css route was most rails, perhaps using a 
session

any thoughts?

personally i wanted an interface with two css options
some pseudo code sketch thing =>

 ____________                  _______________
|            |                |               |
| Large Text |                | Print Version |
|____________|                |_______________|
      |                               |
      |                               |
      V                               V
link_to :css[large]              link_to :css[print]
return {link_to :css[normal]}    return {link_to :css[normal]}



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Jeff Pritchard

2006-Oct-15 15:10 UTC

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Re: Swap CSS

Bill wrote:> I think a smell a CSS/JS switcher plugin or at least a recipe.
> 
> Any takers?
I agree, sounds like a good "pay it forward" project for me.  Only 
problem is that I don''t know how to "get at" the css link
elements from
an rjs file to enable and disable them.

So far, all of the rjs stuff I''ve done has been using element
"id" or
class "id".  If somebody knows how to stuff an "id" into a
CSS link,
that would probably get me moving again.

jp

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Rails - Sep 2006 - Swap CSS

Swap CSS

Re: Swap CSS

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