source: dynamicfieldsplugin/0.12/dynfields/templates/dynfields.html

<!--!
  Copyright (C) 2010-2014 Rob Guttman <guttman@alum.mit.edu>
  All rights reserved.

  This software is licensed as described in the file COPYING, which
  you should have received as part of this distribution.
-->
<script type="text/javascript" xmlns="http://www.w3.org/1999/xhtml"
      xmlns:xi="http://www.w3.org/2001/XInclude"
      xmlns:py="http://genshi.edgewall.org/" py:strip="">

var get_triggers = function(){
    if (window.dynfields_rules == undefined)
        window.dynfields_rules = new Object();
        
    var triggers = new Object();
    <py:for each="trigger,specs in data.triggers.items()" >
        triggers['${trigger}'] = new Array();
        
        // determine field selector; 'owner' field is special case 
        var selector = '#field-${trigger}';
        if ('${trigger}' == 'owner'){
            if (jQuery(selector).length != 1){
                if (jQuery('#action_assign_reassign_owner').length){
                    selector = '#action_assign_reassign_owner';
                } else {
                    selector = '#action_reassign_reassign_owner';
                }
            }
        }
        triggers['${trigger}'].selector = selector;
        
        <py:for each="spec in specs" >
            var spec = new Object();
            <py:for each="key,val in spec.items()" >
                spec['${key}'] = '${val}';
            </py:for>
            spec['rule'] = window.dynfields_rules[spec.rule_name];
            triggers['${trigger}'].push(spec);
        </py:for>
    </py:for>
    return triggers;
}

var apply_rules = function(){
    var input = $(this);
    var triggers = get_triggers();
    
    // execute the rule lifecycle...
    
    // setup each rule
    jQuery.each(triggers, function(trigger,specs){
        jQuery.each(specs, function(i,spec){
            spec.rule.setup(input, spec);
        });
    });
    
    // apply each rule
    jQuery.each(triggers, function(trigger,specs){
        jQuery.each(specs, function(i,spec){
            if (input.attr('id') != specs.selector.slice(1))
                return;
            spec.rule.apply(input, spec);
        });
    });
    
    // complete each rule
    jQuery.each(triggers, function(trigger,specs){
        jQuery.each(specs, function(i,spec){
            if (input.attr('id') != specs.selector.slice(1))
                return;
            spec.rule.complete(input, spec);
        });
    });
}

jQuery(document).ready(function($){
    var triggers = get_triggers(); // trigger fields
    var inputs = new Array();
    
    // collect all input fields that trigger rules
    jQuery.each(triggers, function(trigger,specs){
        var input = jQuery(specs.selector).get(0);
        inputs.push(input);
    });
    inputs = jQuery.unique(inputs);
    
    // attach change event to each input and trigger first change
    jQuery.each(inputs, function(obj){
        $(this).change(apply_rules).change();
    });
});
</script>