(r4) BehaviourContrib < TWiki

TWiki Web>BehaviourContrib (revision 4) (raw view)~~EditAttach~~
---+!! !Behaviour Javascript Framework Contrib
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%SHORTDESCRIPTION%

---++ Introduction

This contrib packages the third-party =Behaviour= Javascript event library, available from http://bennolan.com/behaviour/.

Behaviour uses CSS selectors to subscribe to Javascript event handlers. This allows to create clean code, separated from HTML (and well suited to create Javascript based interaction that degrades nicely when Javascript is not available).

From the website:
<blockquote>
After all the work of WASP and others to promote clean markup, valid pages and graceful degradation via css - it sucks that we're going back to tag soup days by throwing javascript tags into our html.

The better way to do javascript is to do it unobtrusively. PPK and Simon Willison have been recommending this approach for ages. And it's definitely the way to go. The only problem is that it's a bit of a pain in the ass.

That's why I came up with Behaviour - my solution to unobtrusive javascript behaviours.

*How does it work?*

Behaviour lets you use CSS selectors to specify elements to add javascript events to. This means that instead of writing:

<verbatim>
<li>
 <a onclick="this.parentNode.removeChild(this)" href="#">
  Click me to delete me
 </a>
</li>
</verbatim>

You can use:

<verbatim>
<ul id="example">
 <li>
  <a href="/someurl">Click me to delete me</a>
 </li>
</ul>
</verbatim>

And then use css selectors to select that element and add javascript functions to it.

<verbatim>
var myrules = {
 '#example li' : function(el){
  el.onclick = function(){
   this.parentNode.removeChild(this);
  }
 }
};
Behaviour.register(myrules);
</verbatim>
</blockquote>

---++ Usage

Include the Javascript file:

<blockquote>
<verbatim>
<script type="text/javascript" src="%PUBURL%/%SYSTEMWEB%/BehaviourContrib/behaviour.js"></script>
</verbatim>
</blockquote>

In your code you create a "rules" object, with sub-objects for each html element class name or id:
<blockquote>
<verbatim>
var myrules = {
 '.classname' : function(element) {
  // element event
  element.onclick = function() {
   // code here
  }
 },
 '#id' : function(element) {
  // element event
  element.onclick = function() {
   // code here
  }
 }
};
</verbatim>

Or use nested identifiers:

<verbatim>
var myrules = {
 '.menu li a' : function(element) {
  element.onclick = function() {
   // code here
  }
 }
};
</verbatim>
</blockquote>

Apply the rules with:

<blockquote>
<verbatim>
Behaviour.register(myrules);
</verbatim>
</blockquote>

---+++ Example

If we have a 'normal' link to TWiki Web hometopic: [[%SYSTEMWEB%.%HOMETOPIC%][TWiki Web Home]], we can use javascript to make it open a popup window. When javascript is not available the link behaviour defaults to opening the page in the current window.

<blockquote>
<verbatim>
<div id="demoblock" style="padding:1em; width:100px; text-align:center;">
MOUSE OVER ME
</div>

<script type="text/javascript">
// <![CDATA[
var myrules = {
 '#demoblock' : function(el) {
  var defaultColor = '#A3D6F8';
  var highlightColor = '#4A7FB5';

  el.style.backgroundColor = defaultColor;

  el.onmouseover = function() {
   this.style.backgroundColor = highlightColor;
   return false;
  }
  el.onmouseout = function() {
   this.style.backgroundColor = defaultColor;
   return false;
  }
 },
 '#demoblock span' : function(el) {

  var text = el.innerHTML;

  var fisherYates = function (inArray) {
   var i = inArray.length;
   if ( i == 0 ) return false;
   while ( --i ) {
    var j = Math.floor( Math.random() * ( i + 1 ) );
    var tempi = inArray[i];
    var tempj = inArray[j];
    inArray[i] = tempj;
    inArray[j] = tempi;
   }
  }

  var randomize = function(inText) {
   var letters = inText.split('');
   fisherYates(letters);
   return letters.join('');
  }
  el.onmouseover = function() {
   this.innerHTML = randomize(text);
   return false;
  }
  el.onmouseout = function() {
   this.innerHTML = text;
   return false;
  }
 }
};
Behaviour.register(myrules);
// ]]>
</script>
</verbatim>
</blockquote>

Creates:

<div id="demoblock" style="padding:1em; width:150px; text-align:center;">
<span>MOUSE OVER ME</span>
</div>

<script type="text/javascript">
// <![CDATA[
var myrules = {
 '#demoblock' : function(el) {
  var defaultColor = '#A3D6F8';
  var highlightColor = '#4A7FB5';

  el.style.backgroundColor = defaultColor;

  el.onmouseover = function() {
   this.style.backgroundColor = highlightColor;
   return false;
  }
  el.onmouseout = function() {
   this.style.backgroundColor = defaultColor;
   return false;
  }
 },
 '#demoblock span' : function(el) {

  var text = el.innerHTML;

  var fisherYates = function (inArray) {
   var i = inArray.length;
   if ( i == 0 ) return false;
   while ( --i ) {
    var j = Math.floor( Math.random() * ( i + 1 ) );
    var tempi = inArray[i];
    var tempj = inArray[j];
    inArray[i] = tempj;
    inArray[j] = tempi;
   }
  }

  var randomize = function(inText) {
   var letters = inText.split('');
   fisherYates(letters);
   return letters.join('');
  }
  el.onmouseover = function() {
   this.innerHTML = randomize(text);
   return false;
  }
  el.onmouseout = function() {
   this.innerHTML = text;
   return false;
  }
 }
};
Behaviour.register(myrules);
// ]]>
</script>

---+++ Leaking Danger

Behaviour code leaks memory on Windows Explorer prior to version 7. To prevent leaking, set the element variable to =null=:
<blockquote>
<verbatim>
var myrules = {
 'table.test td' : function(element) {
  element.onmouseover = function() {
   this.style.backgroundColor = highlightColor;
   return false;
  }
  element = null; // by setting this IE will not leak  
 }
};	
Behaviour.register(myrules);
</verbatim>
</blockquote>

---++ Development

   * [[http://groups.google.com/group/behaviour][Google Groups: Behaviour Javascript Library]]
   * [[http://www.nabble.com/Behaviour-Javascript-Library-f16264.html][Nabble - Behaviour Javascript Library forum & mailing list archive]]
   * [[http://groups.google.com/group/behaviour/browse_thread/thread/e9828f9fdb482ac1/8ca704730053e23f?#8ca704730053e23f][Behaviour2]] - update in the making, since 2006

---++ License

Behaviour is freely distributable under the terms of an BSD license. For details see the Behaviour website.

---++ Links

   * [[http://bennolan.com/behaviour/][Behaviour website]]
   * [[http://groups.google.com/group/behaviour][Behaviour Google Group]]

---++ Installation Instructions

   * For an __automated installation__, run the [[%SCRIPTURL{configure}%][configure]] script and follow "Find More Extensions" in the in the __Extensions__ section.
      * See the [[http://twiki.org/cgi-bin/view/Plugins/BuildContribInstallationSupplement][installation supplement]] on TWiki.org for more information.

   * Or, follow these __manual installation__ steps:
      * Download the ZIP file from the extension home on twiki.org (see below).
      * Unzip ==%TOPIC%.zip== in your twiki installation directory.
      * Set the ownership of the extracted directories and files to the webserver user.
      * Install the dependencies (if any).


---++ Contrib Settings

   * Set SHORTDESCRIPTION = =Behaviour= Javascript event library to create Javascript based interactions that degrade well when Javascript is not available

You can also set the global TWiki variable BEHAVIOURCONTRIB_DEBUG to 1 to make the contrib use uncompressed javascript sources, in the event of problems.

---++ Contrib Info

|  Author: | TWiki:Main/ArthurClemens |
|  Copyright: | Code: =behaviour.js= version 1.1 - Copyright (c) Ben Nolan and Simon Willison.%BR% TWiki distribution and updates/additions: &copy; TWiki:Main/ArthurClemens.%BR% &copy; 2006-2015 TWiki:TWiki/TWikiContributor |
|  License: | BSD for =behaviour.js= %BR% GPL ([[http://www.gnu.org/copyleft/gpl.html][GNU General Public License]]) for TWiki !BehaviourContrib |
|  Version: | 29499 (2015-11-29) |
|  Dependencies: | None |
|  Contrib&nbsp;Version: | 1.4 |
|  Change&nbsp;History: | <!-- specify latest version first -->&nbsp; |
|  2015-02-16: | TWikibug:Item7604: Switch from GPL v2 to v3 |
|  2010-05-15: | TWikibug:Item6433 - doc improvements; replacing TWIKIWEB with SYSTEMWEB |
|  17 Oct 2007 | 1.3 Replaced "faster code" by other code from Dean Edwards, [[ packed by http://groups.google.com/group/behaviour/browse_thread/thread/85137977bedf5ed/3cf3ba8065d41a8c#3cf3ba8065d41a8c][Raymond Irving]]. |
|  02 Jul 2007 | 1.2 Integrated other faster code by Dean Edwards: [[http://dean.edwards.name/weblog/2006/06/again/][faster onload (again)]]. |
|  08 Mar 2007 | 1.1 Integrated code by Dean Edwards (see [[#CodeUpdate][Code update version 1.1 with faster DOM queries]]). |
|  04 Jun 2006 | 1.0  First Version. Included Behaviour version: 1.1. |
|  Home: | http://TWiki.org/cgi-bin/view/Plugins/%TOPIC% |
|  Feedback: | http://TWiki.org/cgi-bin/view/Plugins/%TOPIC%Dev |
|  Appraisal: | http://TWiki.org/cgi-bin/view/Plugins/%TOPIC%Appraisal |

__Related Topics:__ %SYSTEMWEB%.TWikiPreferences
Attachments
I	Attachment	Action	Size	Date	Who	Comment
js	behaviour.js	manage	2.8 K	2006-10-28 - 22:49	TWikiContributor
Topic revision: r1 - 2015-02-17 - 08:33:24 - TWikiGuest
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