Added live update example.
Chris Double
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/*
liveUpdater.js originally written by Avi Bryant, author of
Seaside (http://www.beta4.com/seaside2)
Modifed by Chris Double to add LiveUpdaterPost and use '
instead of " for the id.
*/
function liveUpdaterUri(uri)
{
return liveUpdater(function() { return uri; });
}
function liveUpdater(uriFunc)
{
var request = false;
var regex = /<(\w+).*?id='(\w+)'.*?>((.|\n)*)<\/\1>/;
if (window.XMLHttpRequest) {
request = new XMLHttpRequest();
}
function update()
{
if(request && request.readyState < 4)
request.abort();
if(!window.XMLHttpRequest)
request = new ActiveXObject("Microsoft.XMLHTTP");
request.onreadystatechange = processRequestChange;
request.open("GET", uriFunc());
request.send(null);
return false;
}
function processRequestChange()
{
if(request.readyState == 4)
{
var results = regex.exec(request.responseText);
if(results)
document.getElementById(results[2]).innerHTML = results[3];
}
}
return update;
}
function liveUpdaterPost(uriFunc)
{
var request = false;
var regex = /<(\w+).*?id='(\w+)'.*?>((.|\n)*)<\/\1>/;
if (window.XMLHttpRequest) {
request = new XMLHttpRequest();
}
function update(data)
{
if(request && request.readyState < 4)
request.abort();
if(!window.XMLHttpRequest)
request = new ActiveXObject("Microsoft.XMLHTTP");
request.onreadystatechange = processRequestChange;
request.open("POST", uriFunc());
request.send(data);
return false;
}
function processRequestChange()
{
if(request.readyState == 4)
{
var results = regex.exec(request.responseText);
if(results)
document.getElementById(results[2]).innerHTML = results[3];
}
}
return update;
}
function liveSearch(id, uri)
{
var updater = liveUpdaterPost((function() { return uri; }));
var last = "";
var timeout = false;
function update()
{
if (last != document.getElementById(id).value)
updater("s=" + escape(document.getElementById(id).value));
}
function start() {
if (timeout)
window.clearTimeout(timeout);
timeout = window.setTimeout(update, 300);
}
if (navigator.userAgent.indexOf("Safari") > 0)
document.getElementById(id).addEventListener("keydown",start,false);
else if (navigator.product == "Gecko")
document.getElementById(id).addEventListener("keypress",start,false);
else
document.getElementById(id).attachEvent("onkeydown",start);
}
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! Copyright (C) 2004 Chris Double.
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!
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! Redistribution and use in source and binary forms, with or without
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! modification, are permitted provided that the following conditions are met:
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!
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! 1. Redistributions of source code must retain the above copyright notice,
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! this list of conditions and the following disclaimer.
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!
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! 2. Redistributions in binary form must reproduce the above copyright notice,
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! this list of conditions and the following disclaimer in the documentation
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! and/or other materials provided with the distribution.
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!
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! THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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! INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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! FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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! DEVELOPERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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! SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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! PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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! OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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! WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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! OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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! ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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!
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! An httpd responder that demonstrates using XMLHttpRequest to send
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! asynchronous requests back to the server.
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!
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IN: live-updater-responder
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USE: cont-html
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USE: html
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USE: cont-responder
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USE: cont-utils
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USE: stack
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USE: stdio
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USE: namespaces
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USE: streams
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USE: parser
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USE: lists
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USE: errors
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USE: strings
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USE: logic
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USE: kernel
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USE: prettyprint
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USE: vocabularies
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USE: combinators
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: get-live-updater-js* ( stream -- string )
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#! Read all lines from the stream, creating a string of the result.
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dup freadln dup [ % "\n" % get-live-updater-js* ] [ drop fclose ] ifte ;
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: get-live-updater-js ( filename -- string )
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#! Return the liveUpdater javascript code as a string.
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<filecr> <% get-live-updater-js* %> ;
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: write-live-anchor-tag ( text -- id )
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#! Write out the HTML for the clickable anchor. This
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#! will have no actionable HREF assigned to it. Instead
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#! an onclick is set via DHTML later to make it run a
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#! quotation on the server. The randomly generated id
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#! for the anchor is returned.
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<a id= get-random-id dup href= "#" a> [
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swap write
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] </a> ;
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: register-live-anchor-quot ( div-id div-quot -- kid )
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#! Register the 'quot' with the cont-responder so
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#! that when it is run it will produce an HTML
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#! fragment which is the output generated by calling
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#! 'quot'. That HTML fragment will be wrapped in a
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#! 'div' with the given id.
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<namespace> [
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"div-quot" set
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"div-id" set
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] extend [
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[
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t "disable-initial-redirect?" set
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[
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<div id= "div-id" get div> [ "div-quot" get call ] </div>
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] show
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] bind
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] cons t swap register-continuation ;
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: write-live-anchor-script ( div-id div-quot anchor-id -- )
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#! Write the javascript that will attach the onclick
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#! event handler to the anchor with the 'anchor-id'. The
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#! onclick, when clicked, will retrieve from the server
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#! the HTML generated by the output of 'div-quot' wrapped
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#! in a 'div' tag with the 'div-id'. That 'div' tag will
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#! replace whatever HTML DOM object currently has that same
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#! id.
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<script language= "JavaScript" script> [
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"document.getElementById('" write
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write
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"').onclick=liveUpdaterUri('" write
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register-live-anchor-quot write
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"');" write
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] </script> ;
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: live-anchor ( id quot text -- )
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#! Write out the HTML for an anchor that when clicked
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#! will replace the DOM object on the current page with
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#! the given 'id' with the result of the output of calling
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#! 'quot'.
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write-live-anchor-tag
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write-live-anchor-script ;
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: write-live-search-tag ( -- id )
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#! Write out the HTML for the input box. This
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#! will have no actionable keydown assigned to it. Instead
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#! a keydown is set via DHTML later to make it run a
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#! quotation on the server. The randomly generated id
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#! for the input box is returned.
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<input id= get-random-id dup type= "text" input/> ;
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: register-live-search-quot ( div-id div-quot -- kid )
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#! Register the 'quot' with the cont-responder so
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#! that when it is run it will produce an HTML
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#! fragment which is the output generated by calling
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#! 'quot'. That HTML fragment will be wrapped in a
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#! 'div' with the given id. The 'quot' is called with
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#! a string on top of the stack. This is the input string
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#! entered in the live search input box.
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<namespace> [
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"div-quot" set
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"div-id" set
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] extend [
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[
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t "disable-initial-redirect?" set
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#! Retrieve the search query value from the POST parameters.
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[ "s" get ] bind
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[
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#! Don't need the URL as the 'show' won't be resumed.
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drop
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<div id= "div-id" get div> [ "div-quot" get call ] </div>
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] show
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] bind
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] cons t swap register-continuation ;
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: write-live-search-script ( div-id div-quot id-id -- )
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#! Write the javascript that will attach the keydown handler
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#! to the input box with the give id. Whenever a keydown is
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#! received the 'div-quot' will be executed on the server,
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#! with the input boxes text on top of the stack. The
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#! output of the quot will be an HTML fragment, it is wrapped in
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#! a 'div' with the id 'div-id' and will
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#! replace whatever HTML DOM object currently has that same
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#! id.
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<script language= "JavaScript" script> [
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"liveSearch('" write
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write
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"', '" write
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register-live-search-quot write
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"');" write
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] </script> ;
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: live-search ( div-id div-quot -- )
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#! Write an input text field. The keydown of this
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#! text field will run 'div-quot' on the server with
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#! the value of the text field on the stack. The output
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#! of div-quot will replace the HTML DOM object with the
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#! given id.
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write-live-search-tag
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write-live-search-script ;
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: live-search-see-word ( string -- )
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#! Given a string that is a factor word, show the
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#! source to that word.
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<namespace> [
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"responder" "inspect" put
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<pre> [
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"stdio" get <html-stream> [
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see
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] with-stream
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] </pre>
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] bind ;
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: live-search-apropos-word ( string -- )
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#! Given a string that is a factor word, show the
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#! aporpos of that word.
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<namespace> [
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"responder" "inspect" put
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<pre> [
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"stdio" get <html-stream> [
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apropos.
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] with-stream
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] </pre>
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] bind ;
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: live-updater-responder ( -- )
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[
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drop
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<html> [
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<head> [
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<title> [ "Live Updater Example" write ] </title>
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<script language= "JavaScript" script> [
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"js/liveUpdater.js" get-live-updater-js write
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] </script>
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] </head>
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<body> [
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"millis" [ millis write ] "Display Server millis" live-anchor
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<div id= "millis" div> [
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"The millisecond time from the server will appear here" write
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] </div>
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<br/>
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"Enter a word to see:" paragraph
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"search" [ live-search-see-word ] live-search
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<br/>
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<div id= "search" div> [
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"" write
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] </div>
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"Enter a word to apropos:" paragraph
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"apropos" [ live-search-apropos-word ] live-search
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<br/>
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<div id= "apropos" div> [
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"" write
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] </div>
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] </body>
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] </html>
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] show ;
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"live-updater" [ live-updater-responder ] install-cont-responder
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