web services - Failure to emit css link html using html_receive and html_post -


trying straightforward.. emit html link stylesheet, explained here, on swi prolog page: repositioning html css , javascript links:

http://www.swi-prolog.org/pldoc/man?section=html-post

the included library is:

:- use_module(library(http/html_write)).

i have generic dcg rule outputting css, per example:

css(url) -->     html_post(css,       link([ type('text/css'),              rel('stylesheet'),              href(url)            ])).

then example says 'next insert unique css links..', example given doesn't supply parameter unique url inserted. i'm guessing @ this:

reply_html_page([title('mytitle'),   \html_receive(css('/my.css'))], [   div([id='mydivid'], 'divstuff..'   )  ]).

but running not output css expected.. title gets processed, css link missing.

content-type: text/html; charset=utf-8  <!doctype html> <html> <head> <title>mytitle</title>  <meta http-equiv="content-type" content="text/html; charset=utf-8">  </head> <body> <div id="mydivid">divstuff..</div> </body> </html>

looking @ trace, css dcg rule never gets executed(version 6.6.4).

edit: perhaps solution needs include html_receive/2(+id, :handler), rather /1, there no simple copy/paste/run examples explain it's usage. code snippet html_receive/2 contains html_post.

i have used simple/atomic identifier in html_post//1 , html_receive//1, both make example easier , stay closer swi-prolog documentation. identifier can compound, did not use in example.

the following code opens web browser generated html page. standard html inspection tools show link element there now.

:- module(css_include, []).  :- use_module(library(http/html_write)). :- use_module(library(http/http_dispatch)). :- use_module(library(http/thread_httpd)). :- use_module(library(www_browser)).  :- http_server(http_dispatch, [port(5000)]). :- http_handler(root(test), test, []).  test(_):-   reply_html_page(     [title('mytitle'),\html_receive(my_css_link)],     \html_body_stuff   ),   www_open_url('http://localhost:5000/test').  html_body_stuff -->   {url = 'http://www.swi-prolog.org'},   html_post(     my_css_link,     link([type('text/css'),rel('stylesheet'),href(url)])   ).

edit: based on comment @magus have included 'normal' way of generating html page css link in header, i.e. without using html_post//1 , html_receive//1. may useful comparison other code snippet.

:- module(css_include, []).  :- use_module(library(http/html_write)). :- use_module(library(http/http_dispatch)). :- use_module(library(http/thread_httpd)). :- use_module(library(www_browser)).  :- http_server(http_dispatch, [port(5000)]). :- http_handler(root(test), test, []).  test(_):-   reply_html_page(     [title('mytitle'),\a_css_link('http://www.swi-prolog.org')],     \html_body_stuff   ).  a_css_link(url) -->   html(link([type('text/css'),rel('stylesheet'),href(url)])).  html_body_stuff -->   html(h1('html body on here.')).

the clause a_css_link//1 can reused other uris requested.

hope helps!


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