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Behaviour Javascript Framework Contrib

Behaviour Javascript event library to create Javascript based interactions that degrade well when Javascript is not available

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:

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:

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

You can use:

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

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

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

Usage

Include the Javascript file:

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

In your code you create a "rules" object, with sub-objects for each html element class name or id:

var myrules = {
 '.classname' : function(element) {
  // element event
  element.onclick = function() {
   // code here
  }
 },
 '#id' : function(element) {
  // element event
  element.onclick = function() {
   // code here
  }
 }
};

Or use nested identifiers:

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

Apply the rules with:

Behaviour.register(myrules);

Example

If we have a 'normal' link to TWiki Web 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.

<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>

Creates:

MOUSE OVER ME

Leaking Danger

Behaviour code leaks memory on Windows Explorer prior to version 7. To prevent leaking, set the element variable to null:

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);

Development

License

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

Links

Installation Instructions

  • For an automated installation, run the configure script and follow "Find More Extensions" in the in the Extensions section.

  • Or, follow these manual installation steps:
    • Download the ZIP file from the extension home on twiki.org (see below).
    • Unzip BehaviourContrib.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.
TWiki distribution and updates/additions: © TWiki:Main/ArthurClemens.
© 2006-2015 TWiki:TWiki/TWikiContributor
License: BSD for behaviour.js
GPL (GNU General Public License) for TWiki BehaviourContrib
Version: 28740 (2015-02-17)
Dependencies: None
Contrib Version: 1.4
Change History:  
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: faster onload (again).
08 Mar 2007 1.1 Integrated code by Dean Edwards (see 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/BehaviourContrib
Feedback: http://TWiki.org/cgi-bin/view/Plugins/BehaviourContribDev
Appraisal: http://TWiki.org/cgi-bin/view/Plugins/BehaviourContribAppraisal

Related Topics: TWikiPreferences

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