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esther.fuldauer-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Feb-18 21:07 UTC

[Prototype]Ajax.Updater: contents not showing

Hi,

I''m new to Prototype and I''m trying to use Ajax.Updater to
update a
pege with new content depending on the day of the week. I''m doing this
with an html for each day, but maybe you could suggest how to do this
with a single xml file?
In any case, my problem is that the code below doesn''t work and i
don''t know why.
In the function showResponse() the alert displays the html contents,
so the updater is working correctly only that the ''content''
container
is not displaying.
What am I doing wrong?


<html>
<head>
<script src="lib/prototype/prototype.js"
type="text/javascript"></
script>
<script language="JavaScript" type="text/javascript">
today=new Date();
weekday=today.getDay();
weekdays=[''sunday'',''monday'',''tuesday'',''wednesday'',''thursday'',''friday'',''saturday''];
var ajax = new
Ajax.Updater(''content'',weekdays[0]+''.htm'',
         {                // options
             method:''get'',
             onComplete: showResponse
             });

function showResponse(req)
{
alert(req.responseText);
$(''content'').innerHTML = req.responseText;

}

</script>
</head>
<body>
<div id="content"></div>
</body>
</html>


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Colin Mollenhour

2007-Feb-18 22:23 UTC

head link

Re: [Prototype]Ajax.Updater: contents not showing

Ajax.Updater is basically a wrapper for Ajax.Request which calls an 
insertion function (default is Element.update) on the element passed, so 
your onComplete function is not necessary. You are basically updating 
that element twice but I think it should still update.. perhaps the 
other problem is that your script is running before the content div is 
loaded? Try placing your script block at the end of the body or at least 
anywhere after the <div>. Also there is usually no reason to store the 
Ajax requests in a variable. Your Ajax.Updater call could then look like 
this:

new
Ajax.Updater(''content'',weekdays[weekday]+''.htm'',{method:
get});

or, if you want to do something with the responseText before updating:

new
Ajax.Updater(''content'',weekdays[weekday]+''.htm'',{
    method: get,
    insertion: function(element,update){
        alert(element.id+'' gets ''+update);
        Element.update(element,update);
    }
});

Colin


esther.fuldauer-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:> Hi,
>
> I''m new to Prototype and I''m trying to use Ajax.Updater
to update a
> pege with new content depending on the day of the week. I''m doing
this
> with an html for each day, but maybe you could suggest how to do this
> with a single xml file?
> In any case, my problem is that the code below doesn''t work and i
> don''t know why.
> In the function showResponse() the alert displays the html contents,
> so the updater is working correctly only that the
''content'' container
> is not displaying.
> What am I doing wrong?
>
>
> <html>
> <head>
> <script src="lib/prototype/prototype.js"
type="text/javascript"></
> script>
> <script language="JavaScript"
type="text/javascript">
> today=new Date();
> weekday=today.getDay();
>
weekdays=[''sunday'',''monday'',''tuesday'',''wednesday'',''thursday'',''friday'',''saturday''];
> var ajax = new
Ajax.Updater(''content'',weekdays[0]+''.htm'',
>          {                // options
>              method:''get'',
>              onComplete: showResponse
>              });
>
> function showResponse(req)
> {
> alert(req.responseText);
> $(''content'').innerHTML = req.responseText;
>
> }
>
> </script>
> </head>
> <body>
> <div id="content"></div>
> </body>
> </html>
>
>
> >
>
>   

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Esther

2007-Feb-18 22:56 UTC

head link

Re: [Prototype]Ajax.Updater: contents not showing

Colin,
You were right. By placing the script after the div, the content
finaly got updated.
However I tryed your shortened code but it didn''t work. I
don''t know
why, maybe the onComplete does make a difference. By all logic it
should work.

Thanks for the explanation and the tip about changing the
responseText.


On Feb 18, 11:23 pm, Colin Mollenhour
<eliteii...-NPSFNn/7+NYVo650/ln6uw@public.gmane.org>
wrote:> Ajax.Updater is basically a wrapper for Ajax.Request which calls an
> insertion function (default is Element.update) on the element passed, so
> your onComplete function is not necessary. You are basically updating
> that element twice but I think it should still update.. perhaps the
> other problem is that your script is running before the content div is
> loaded? Try placing your script block at the end of the body or at least
> anywhere after the <div>. Also there is usually no reason to store
the
> Ajax requests in a variable. Your Ajax.Updater call could then look like
> this:
>
> new
Ajax.Updater(''content'',weekdays[weekday]+''.htm'',{method:
get});
>
> or, if you want to do something with the responseText before updating:
>
> new
Ajax.Updater(''content'',weekdays[weekday]+''.htm'',{
>     method: get,
>     insertion: function(element,update){
>         alert(element.id+'' gets ''+update);
>         Element.update(element,update);
>     }
>
> });
>
> Colin
>
> esther.fulda...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
> > Hi,
>
> > I''m new to Prototype and I''m trying to use
Ajax.Updater to update a
> > pege with new content depending on the day of the week. I''m
doing this
> > with an html for each day, but maybe you could suggest how to do this
> > with a single xml file?
> > In any case, my problem is that the code below doesn''t work
and i
> > don''t know why.
> > In the function showResponse() the alert displays the html contents,
> > so the updater is working correctly only that the
''content'' container
> > is not displaying.
> > What am I doing wrong?
>
> > <html>
> > <head>
> > <script src="lib/prototype/prototype.js"
type="text/javascript"></
> > script>
> > <script language="JavaScript"
type="text/javascript">
> > today=new Date();
> > weekday=today.getDay();
> >
weekdays=[''sunday'',''monday'',''tuesday'',''wednesday'',''thursday'',''friday'',''saturday''];
> > var ajax = new
Ajax.Updater(''content'',weekdays[0]+''.htm'',
> >          {                // options
> >              method:''get'',
> >              onComplete: showResponse
> >              });
>
> > function showResponse(req)
> > {
> > alert(req.responseText);
> > $(''content'').innerHTML = req.responseText;
>
> > }
>
> > </script>
> > </head>
> > <body>
> > <div id="content"></div>
> > </body>
> > </html>

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Colin Mollenhour

2007-Feb-19 03:14 UTC

head link

Re: [Prototype]Ajax.Updater: contents not showing

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
  <meta content="text/html;charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#ffffff" text="#000000">
Oh, looks like I forgot to add the quotes around "get"...<br>
<br>
Colin<br>
<br>
Esther wrote:
<blockquote
 cite="mid:1171839382.234126.310540-5wKdhOQDh7Nfvz3QPplmsGB/v6IoIuQBVpNB7YpNyf8@public.gmane.org"
 type="cite">
  <pre wrap="">
Colin,
You were right. By placing the script after the div, the content
finaly got updated.
However I tryed your shortened code but it didn''t work. I
don''t know
why, maybe the onComplete does make a difference. By all logic it
should work.

Thanks for the explanation and the tip about changing the
responseText.


On Feb 18, 11:23 pm, Colin Mollenhour <a
class="moz-txt-link-rfc2396E"
href="mailto:eliteii...-NPSFNn/7+NYVo650/ln6uw@public.gmane.org">&lt;eliteii...-NPSFNn/7+NYVo650/ln6uw@public.gmane.org&gt;</a>
wrote:
  </pre>
  <blockquote type="cite">
    <pre wrap="">Ajax.Updater is basically a wrapper for
Ajax.Request which calls an
insertion function (default is Element.update) on the element passed, so
your onComplete function is not necessary. You are basically updating
that element twice but I think it should still update.. perhaps the
other problem is that your script is running before the content div is
loaded? Try placing your script block at the end of the body or at least
anywhere after the &lt;div&gt;. Also there is usually no reason to store
the
Ajax requests in a variable. Your Ajax.Updater call could then look like
this:

new
Ajax.Updater(''content'',weekdays[weekday]+''.htm'',{method:
get});

or, if you want to do something with the responseText before updating:

new
Ajax.Updater(''content'',weekdays[weekday]+''.htm'',{
    method: get,
    insertion: function(element,update){
        alert(element.id+'' gets ''+update);
        Element.update(element,update);
    }

});

Colin

<a class="moz-txt-link-abbreviated"
href="mailto:esther.fulda...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org">esther.fulda...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org</a>
wrote:
    </pre>
    <blockquote type="cite">
      <pre wrap="">Hi,
      </pre>
    </blockquote>
    <blockquote type="cite">
      <pre wrap="">I''m new to Prototype and
I''m trying to use Ajax.Updater to update a
pege with new content depending on the day of the week. I''m doing this
with an html for each day, but maybe you could suggest how to do this
with a single xml file?
In any case, my problem is that the code below doesn''t work and i
don''t know why.
In the function showResponse() the alert displays the html contents,
so the updater is working correctly only that the ''content''
container
is not displaying.
What am I doing wrong?
      </pre>
    </blockquote>
    <blockquote type="cite">
      <pre wrap="">&lt;html&gt;
&lt;head&gt;
&lt;script src="lib/prototype/prototype.js"
type="text/javascript"&gt;&lt;/
script&gt;
&lt;script language="JavaScript"
type="text/javascript"&gt;
today=new Date();
weekday=today.getDay();
weekdays=[''sunday'',''monday'',''tuesday'',''wednesday'',''thursday'',''friday'',''saturday''];
var ajax = new
Ajax.Updater(''content'',weekdays[0]+''.htm'',
         {                // options
             method:''get'',
             onComplete: showResponse
             });
      </pre>
    </blockquote>
    <blockquote type="cite">
      <pre wrap="">function showResponse(req)
{
alert(req.responseText);
$(''content'').innerHTML = req.responseText;
      </pre>
    </blockquote>
    <blockquote type="cite">
      <pre wrap="">}
      </pre>
    </blockquote>
    <blockquote type="cite">
      <pre wrap="">&lt;/script&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;div id="content"&gt;&lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;
      </pre>
    </blockquote>
  </blockquote>
  <pre wrap=""><!---->



  </pre>
</blockquote>
<br>
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</body>
</html>

<br>

Christophe Porteneuve

2007-Feb-19 08:14 UTC

head link

Re: [Prototype]Ajax.Updater: contents not showing

Hey Esther,

All AJAX aside, why are you using AJAX to do something that could
clearly be done server-side?

I mean, you''re just loading *the entire page contents* based on the
freakin'' weekday!  This can be done server-side using SSI''s,
PHP, or
whatnot.  Even if you need to work based on the visitor''s TZ''s
weekday,
HTTP headers will give you his/her GMT offset anyway...  This would take
<10 lines in any server-side tech.

Even from an accessibility standpoint, this is *not* comfort, this is
core functionality here (the whole contents!), so this should not depend
on JS and AJAX being available.

From a visual standpoint, this also means that with any network latency,
the visitor will first encounter an empty page, and have no visual clue
that the actual contents is loading from then on...  Not too good.

In short, this sounds to me like a textbook case of AJAX used where
it''s
clearly not the relevant path.

Sometimes we''re so bent on implementation, we forget the bigger
picture.
 I may be wrong (not having the bigger picture), but from the problem
you described, I fail to see why AJAX is needed at all!

Just my two cents,

-- 
Christophe Porteneuve a.k.a. TDD
"[They] did not know it was impossible, so they did it." --Mark Twain
Email: tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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Esther Fuldauer

2007-Feb-19 08:29 UTC

head link

Re: [Prototype]Ajax.Updater: contents not showing

Hi Christophe,

Yes, I know it sounds silly, but my company contracted a useless service
provider before I came on board that I have to live with for the time being.
A CMS system for dummies which I can''t add any server-side scripts to.
So imagine how I feel having to update stupid text daily by hand.
Hopefully this will change in a couple months and I can have a proper Apache
server which is completely under my control.
The contents are only 3 sentences long, so that won''t take too much to
load.
At any rate, I will have a text there saying "loading..."

Do you see the big picture now? I''m stuck with server-side scripting at
the
moment.
A good chance to learn a bit more of javascript and AJAX.

By the way, now that I have you in the thread, do you know or could indicate
me whree I could find some example on how to do this using xml instead of
html for the data?

Cheers :)

2007/2/19, Christophe Porteneuve
<tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org>:>
>
> Hey Esther,
>
> All AJAX aside, why are you using AJAX to do something that could
> clearly be done server-side?
>
> I mean, you''re just loading *the entire page contents* based on
the
> freakin'' weekday!  This can be done server-side using
SSI''s, PHP, or
> whatnot.  Even if you need to work based on the visitor''s
TZ''s weekday,
> HTTP headers will give you his/her GMT offset anyway...  This would take
> <10 lines in any server-side tech.
>
> Even from an accessibility standpoint, this is *not* comfort, this is
> core functionality here (the whole contents!), so this should not depend
> on JS and AJAX being available.
>
> From a visual standpoint, this also means that with any network latency,
> the visitor will first encounter an empty page, and have no visual clue
> that the actual contents is loading from then on...  Not too good.
>
> In short, this sounds to me like a textbook case of AJAX used where
it''s
> clearly not the relevant path.
>
> Sometimes we''re so bent on implementation, we forget the bigger
picture.
> I may be wrong (not having the bigger picture), but from the problem
> you described, I fail to see why AJAX is needed at all!
>
> Just my two cents,
>
> --
> Christophe Porteneuve a.k.a. TDD
> "[They] did not know it was impossible, so they did it." --Mark
Twain
> Email: tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org
>
> >
>

-- 
Esther Fuldauer
Web Developer & Designer
tlf. 972355421
movil 679066844

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Christophe Porteneuve

2007-Feb-19 09:37 UTC

head link

Re: [Prototype]Ajax.Updater: contents not showing

Hey Esther,

Esther Fuldauer a écrit :> Do you see the big picture now? I''m stuck with server-side
scripting at
> the moment.
Client-side, actually :-)
> By the way, now that I have you in the thread, do you know or could 
"Now that you have *me* in the thread?"  Uh?!
> indicate me whree I could find some example on how to do this using xml 
> instead of html for the data?
Well, I can''t see how useful that would be.  I mean, you''re
already
applying a band-aid over it because you can''t, so far, do it properly 
(server-side).  Why would you want to add extra complexity by moving it 
to XML?  This doesn''t appear to be useful at all.

I mean:

1) The data you''re getting back are to be presented as HTML
2) Their semantics is probably properly represented by <p> and the like.
3) The data isn''t generated by something else, then hand-converted to 
HTML, is it?  It''s created as HTML already, I suppose?  So why adding 
unnecessary juggling?
4) Client-side processing of this XML would require manual exploration 
of its DOM (I assume you have no control over the client-side browsers, 
so XPath or E4X are out of the question), and XHTML DOM building (even 
with script.aculo.us'' Builder...).  Or even worse: XSL/T transforms! 
Yay!

So, in a word: are you *sure* you want to add this extraneous complexity?

-- 
Christophe Porteneuve aka TDD
tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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Esther Fuldauer

2007-Feb-19 09:48 UTC

head link

Re: [Prototype]Ajax.Updater: contents not showing

Yeah, You are right, to update a tiny pice of text daily I''m best off
with
the html bits instead of xml

I was thinking more of another case I have where I need to update the html
each time the page gets loaded. If the pieces I need to rotate on the page
are more than 20, how do you suggest I go about it? Also an html for each
piece?

Thanks

2007/2/19, Christophe Porteneuve
<tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org>:>
>
> Hey Esther,
>
> Esther Fuldauer a écrit :
> > Do you see the big picture now? I''m stuck with server-side
scripting at
> > the moment.
>
> Client-side, actually :-)
>
> > By the way, now that I have you in the thread, do you know or could
>
> "Now that you have *me* in the thread?"  Uh?!
>
> > indicate me whree I could find some example on how to do this using
xml
> > instead of html for the data?
>
> Well, I can''t see how useful that would be.  I mean,
you''re already
> applying a band-aid over it because you can''t, so far, do it
properly
> (server-side).  Why would you want to add extra complexity by moving it
> to XML?  This doesn''t appear to be useful at all.
>
> I mean:
>
> 1) The data you''re getting back are to be presented as HTML
> 2) Their semantics is probably properly represented by <p> and the
like.
> 3) The data isn''t generated by something else, then hand-converted
to
> HTML, is it?  It''s created as HTML already, I suppose?  So why
adding
> unnecessary juggling?
> 4) Client-side processing of this XML would require manual exploration
> of its DOM (I assume you have no control over the client-side browsers,
> so XPath or E4X are out of the question), and XHTML DOM building (even
> with script.aculo.us'' Builder...).  Or even worse: XSL/T
transforms!  Yay!
>
> So, in a word: are you *sure* you want to add this extraneous complexity?
>
> --
> Christophe Porteneuve aka TDD
> tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org
>
> >
>

-- 
Esther Fuldauer
Web Developer & Designer
tlf. 972355421
movil 679066844

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Christophe Porteneuve

2007-Feb-19 10:15 UTC

head link

Re: [Prototype]Ajax.Updater: contents not showing

Hey Esther,

Esther Fuldauer a écrit :> I was thinking more of another case I have where I need to update the 
> html each time the page gets loaded. If the pieces I need to rotate on 
> the page are more than 20, how do you suggest I go about it? Also an 
> html for each piece?
It really depends on the semantics of your bits.  I mean, eventually 
they''re HTML in the page.  So how are they represented originally?  Are
those static XHTML fragments?  If yes, don''t bother: get them!

If you worry about the 2-resource-per-domain HTTP recommendation, you 
may decide to concatenate them in a file with delimiters, fetch the 
whole thing, split client-side (String.split is there for you), and do 
updates yourself instead of using Ajax.Updater (e.g. use Ajax.Request 
with a custom onSuccess callback that splits, then loops over fragments 
and containers and calls update manually).

The short point is: if there is no *compelling* reason to use something 
else than HTML for your fragments, then *go HTML*.  Actually, go XHTML 
(no ambiguity makes for faster, more reliable parsing and DOM building 
by the browser).

-- 
Christophe Porteneuve aka TDD
tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org

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Esther Fuldauer

2007-Feb-19 10:25 UTC

head link

Re: [Prototype]Ajax.Updater: contents not showing

I do have a tendency of complicating things hehe ;)
I''ll forget the xml then and use an xhtml file with the split.

Thanks Christophe for your reasoning.
:)

2007/2/19, Christophe Porteneuve
<tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org>:>
>
> Hey Esther,
>
> Esther Fuldauer a écrit :
> > I was thinking more of another case I have where I need to update the
> > html each time the page gets loaded. If the pieces I need to rotate on
> > the page are more than 20, how do you suggest I go about it? Also an
> > html for each piece?
>
> It really depends on the semantics of your bits.  I mean, eventually
> they''re HTML in the page.  So how are they represented originally?
Are
> those static XHTML fragments?  If yes, don''t bother: get them!
>
> If you worry about the 2-resource-per-domain HTTP recommendation, you
> may decide to concatenate them in a file with delimiters, fetch the
> whole thing, split client-side (String.split is there for you), and do
> updates yourself instead of using Ajax.Updater (e.g. use Ajax.Request
> with a custom onSuccess callback that splits, then loops over fragments
> and containers and calls update manually).
>
> The short point is: if there is no *compelling* reason to use something
> else than HTML for your fragments, then *go HTML*.  Actually, go XHTML
> (no ambiguity makes for faster, more reliable parsing and DOM building
> by the browser).
>
> --
> Christophe Porteneuve aka TDD
> tdd-x+CfDp/qHev2eFz/2MeuCQ@public.gmane.org
>
> >
>

-- 
Esther Fuldauer
Web Developer & Designer
tlf. 972355421
movil 679066844

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Walter Lee Davis

2007-Feb-21 01:54 UTC

head link

Re: [Prototype]Ajax.Updater: contents not showing

Please elaborate on this:
On Feb 19, 2007, at 5:15 AM, Christophe Porteneuve wrote:
> If you worry about the 2-resource-per-domain HTTP recommendation, you
> may decide to concatenate them in a file with delimiters, fetch the
> whole thing, split client-side (String.split is there for you), and do
> updates yourself instead of using Ajax.Updater (e.g. use Ajax.Request
> with a custom onSuccess callback that splits, then loops over fragments
> and containers and calls update manually).
>
I haven''t heard of this before, but it is ringing a tiny bell in my 
head about why certain things don''t always work the way I imagine they 
should.

Thanks!

Walter


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Rails spinoffs - Feb 2007 - [Prototype]Ajax.Updater: contents not showing

[Prototype]Ajax.Updater: contents not showing

Re: [Prototype]Ajax.Updater: contents not showing

Re: [Prototype]Ajax.Updater: contents not showing

Re: [Prototype]Ajax.Updater: contents not showing

Re: [Prototype]Ajax.Updater: contents not showing

Re: [Prototype]Ajax.Updater: contents not showing

Re: [Prototype]Ajax.Updater: contents not showing

Re: [Prototype]Ajax.Updater: contents not showing

Re: [Prototype]Ajax.Updater: contents not showing

Re: [Prototype]Ajax.Updater: contents not showing

Re: [Prototype]Ajax.Updater: contents not showing