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Constraints jQuery Plugin

/ Published in: JavaScript

Constraints plugin (requires annotation plugin).

This is the second draft version that has been severly refactoed both internally and externally.

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/*---------------------------------------------------------------------------------
 *
 *  Process Constraints jQuery Plugin
 *
 *---------------------------------------------------------------------------------
 *
 *  This plugin is responsible for apply constraints to a target form.  It 
 *  will examin each fiels annotations to find @Constraints annotation and 
 *  appply the requested constraints to the field.  An number of configuration 
 *  options are available (see below)
 *
 *  @author  James Hughes
 *
 *  -------------------------------------------------------------------------------
 *  24/10/2008 - Initial Version
 *  -------------------------------------------------------------------------------
 *  28/10/2008 - Second Draft: Major Internal Refactoring.  Introduced new public
 *               API's for working with constratins and messages.  Added the 
 *               ability to remove constraints singularly and globally as well as
 *               actually uninstall the plugin.
 *  -------------------------------------------------------------------------------
 *///------------------------------------------------------------------------------
 (function($){
     
    /*-----------------------------------------------------------------------------
     *
     *  isEmpty Utility Function
     *
     *-----------------------------------------------------------------------------
     *
     *  Utility function that ensures a string is either null or an empty string.
     *
     *  @plugin
     *  @param v - the value to check for emptiness
     *
     *///--------------------------------------------------------------------------
    $.isEmpty = function(v){
        return !v || v == "" || $.trim(v) == "";
    };
     
    /*-----------------------------------------------------------------------------
     *
     *  Process Constraints Plugin
     *
     *-----------------------------------------------------------------------------
     *
     *  Extend the jQuery Object to provide a utility function that will perform
     *  the constraint application functionality to the form passed in
     *
     *  @plugin
     *  @param o   - custom options object that accepts
     *
     *      customMessages:    map of custom constraint messages
     *      customConstraints: map of custom constraints to apply
     *      constraintTrigger: event that triggers contraint tests
     *      stopOnFirst:       determines if we break on first error
     *      errorFn:           error handler fn(field, failed)
     *      successFn:         called when all constraints pass
     *
     *///--------------------------------------------------------------------------  
    $.fn.constrain = function(o){
    
        /*-------------------------------------------------------------------------
         *
         *  Apply Options
         *
         *-------------------------------------------------------------------------
         *
         *  Merge the default and custom options resulting in a specific options
         *  map for this function call.
         *
         *///---------------------------------------------------------------------- 
        var options = $.extend({},defaultOptions, o);

/*-------------------------------------------------------------------------
         *
         *  Messages
         *
         *-------------------------------------------------------------------------
         *
         *  Constraint messages are built up from a set of defaults.  Merged with 
         *  a set of user defined messages.  When a constraint fails the first 
         *  message looked up is the id of the field followed by the name of the 
         *  constraint eg - txtName.mandatory.  If this does not exist or if the 
         *  field does not have an id it will ue the default message.
         *
         *///----------------------------------------------------------------------           
        if(o.customMessages){
            MessageSource.addMessages(o.customMessages);
        }
        
        /*-------------------------------------------------------------------------
         *
         *  Create Available Constraints
         *
         *-------------------------------------------------------------------------
         *
         *  Represents a map of all available constraints that can be applied to 
         *  a field.  This is created by merging customConstraints map from the 
         *  passed options with the default constraints.
         *
         *///----------------------------------------------------------------------
        if(options.customConstraints){
            ConstraintService.registerAll(options.customConstraints);
        }
        
        /*-------------------------------------------------------------------------
         *
         *  Apply Constraints
         *
         *-------------------------------------------------------------------------
         *
         *  This section discovers the required constraints on a per field basis 
         *  and applies the behaviour to the field
         *
         *///----------------------------------------------------------------------
        return this.each(function(){

/*---------------------------------------------------------------------
             *
             *  No Constraint Failover
             *
             *---------------------------------------------------------------------
             *
             *  Most of this API is open to the public therefore open to the 
             *  irresponsible, ignorant, clueless and just plain stupid.  We need
             *  to cater for as much worst case edge cases as we can without 
             *  making the good people suffer.  Exit if no constraints defined on 
             *  element.
             *
             *///------------------------------------------------------------------
            if(!$(this).annotations("@Constraints")[0]){ return undefined };
            
            /*---------------------------------------------------------------------
             *
             *  Constraint Discovery
             *
             *---------------------------------------------------------------------
             *
             *  We extract the requested constraints via annotations on the field 
             *  and build a map of applicable constraints which is set as a data 
             *  item on the element.  At the same time we also set another map of 
             *  constratint data that can be passed into the constraint test 
             *  function
             *
             *///------------------------------------------------------------------
            var requestedConstraints = $(this).annotations("@Constraints")[0].data;
            for(constraint in requestedConstraints){
                /* filter out falsey values */
                if(requestedConstraints[constraint]){
                    ConstraintService.bind($(this), constraint, requestedConstraints[constraint]);
                }
            }
            
            /*---------------------------------------------------------------------
             *
             *  Event Binding
             *
             *---------------------------------------------------------------------
             *
             *  Bind the Constraint Trigger Callback to the trigger event.  Also
             *  we are passing in the options object so we still have access to
             *  the options object.  Done in this way to ensure we can unbind the
             *  callback function if the user wants.
             *
             *///------------------------------------------------------------------            
            $(this).bind((this.constraintTrigger = options.constraintTrigger), options, constraintCallback);
        });        
    }
    
    /*-----------------------------------------------------------------------------
     *
     *  Unconstrain Plugin
     *
     *-----------------------------------------------------------------------------
     *
     *  Removes any current constraints applied to the passed in fields as well
     *  as removing data caches and constraint events     
     *
     *  @plugin     
     *
     *///--------------------------------------------------------------------------     
    $.fn.unconstrain = function(){
        return this.each(function(){ ConstraintService.unconstrain(this); });
    }
    
    /*-----------------------------------------------------------------------------
     *
     *  Unconstrain Plugin
     *
     *-----------------------------------------------------------------------------
     *
     *  Helper function to remove all constraints form an entire form.
     *     
     *  @plugin
     *  @param frm - form/id/jQuery representing the form to process     
     *
     *///--------------------------------------------------------------------------             
    $.unconstrainForm = function(frm){
        ConstraintService.unconstrainAll($(frm)[0]);
    }      
     
    /*-----------------------------------------------------------------------------
     *
     *  Process Constraints Plugin
     *
     *-----------------------------------------------------------------------------
     *
     *  Extend the jQuery Object to provide a utility function that will perform
     *  the constraint application functionality to the form passed in
     *
     *  @plugin
     *  @param frm - form/id/jQuery representing the form to process
     *  @param o   - custom options object that accepts
     *
     *      customMessages:    map of custom constraint messages
     *      customConstraints: map of custom constraints to apply
     *      constraintTrigger: event that triggers contraint tests
     *      stopOnFirst:       determines if we break on first error
     *      errorFn:           error handler fn(field, failed)
     *      successFn:         called when all constraints pass
     *
     *///-------------------------------------------------------------------------- 
    $.constrainForm = function(frm,o){
        $.annotated("@Constraints", $(frm)[0]).constrain(o);
    }      
    
    /*-----------------------------------------------------------------------------
     *
     *  Default Options
     *
     *-----------------------------------------------------------------------------
     *
     *  This map represents the global default options that should be used 
     *  when applying constraints.  They can be overridden via custom maps
     *  passed into the functions.
     *
     *///--------------------------------------------------------------------------
    var defaultOptions = {
        customMessages    : {},           // map of custom constraint messages
        customConstraints : {},           // map of custom constraints to apply
        constraintTrigger : 'blur',       // event that triggers contraint tests
        stopOnFirst       : false,        // determines if we break on first error
        errorFn           : function(){}, // error handling callback
        successfn         : function(){}  // successfull callback
    }

/*-----------------------------------------------------------------------------
     *
     *  Constraint Service 
     *
     *-----------------------------------------------------------------------------
     *
     *  Singleton class used to handles page level contraint testing and 
     *  registration.
     *
     *  @constructor
     *
     *///--------------------------------------------------------------------------
    var ConstraintService = function(){
    
        /*-------------------------------------------------------------------------
         *
         *  Default Constraints
         *
         *-------------------------------------------------------------------------
         *
         *  Represents a map of all available constraints that can be applied to a 
         *  field.  This is merged with a custom constraints that can be declared 
         *  via the options object to provide a list of all available constraints 
         *  that can be applied to the fields
         *
         *///----------------------------------------------------------------------
        var defaultConstraints = {
            alpha:function(v){
                return $.isEmpty(v) || /^[a-z]*$/i.test(v);
            },
            alphanumeric:function(v){
                return $.isEmpty(v) || /^[a-z0-9]*$/i.test(v);
            },
            mandatory:function(v){
                return !$.isEmpty(v);
            },
            creditCard:function(v){
                return $.isEmpty(v) || /^\d{4}-?\d{4}-?\d{4}-?\d{4}$/.test(v);
            },
            currency:function(v){
                return $.isEmpty(v) || /^(\d{1,3},?(\d{3},?)*\d{3}(\.\d{0,2})?|\d{1,3}(\.\d{0,2})?|\.\d{1,2}?)$/.test(v);
            },
            digitsOnly:function(v){
                return $.isEmpty(v) || /^[0-9]*$/.test(v);
            },
            email:function(v){
                return $.isEmpty(v) || /^(("[\w-\s]+")|([\w-]+(?:\.[\w-]+)*)|("[\w-\s]+")([\w-]+(?:\.[\w-]+)*))(@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$)|(@\[?((25[0-5]\.|2[0-4][0-9]\.|1[0-9]{2}\.|[0-9]{1,2}\.))((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\.){2}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[0-9]{1,2})\]?$)/i.test(v);
            },
            inList:function(v,l){
                return $.isEmpty(v) || $.inArray(v,l) > -1;
            },
            ip:function(v){
                return $.isEmpty(v) || /^(([01]?\d?\d|2[0-4]\d|25[0-5])\.){3}([01]?\d?\d|2[0-4]\d|25[0-5])$/.test(v);
            },
            matches:function(v,e){
                return $.isEmpty(v) || (e.constructor === RegExp) ? e.test(v) : r == v;
            },
            max:function(v,m){
                return $.isEmpty(v) || (!isNaN(v) && parseInt(v) <= m);
            },
            maxSize:function(v,m){
                return $.isEmpty(v) || v.length <= m;
            },
            min:function(v,m){
                return $.isEmpty(v) || (!isNaN(v) && parseInt(v) >= m);
            },
            minSize:function(v,m){
                return $.isEmpty(v) || v.length >= m;
            },
            notEqual:function(v,n){
                return $.isEmpty(v) || v != n;
            },
            range:function(v,d,e){

if($.isEmpty(v)){ return true; }

switch($(e).data("constraints").type){
                    case 'boolean': return /^(true)|(false)$/i.test(v);
                    case 'date':    return !isNaN(Date.parse(v)) && Date.parse(v) >= Date.parse(d.start) && Date.parse(v) <= Date.parse(d.end);
                    case 'float':   return !isNaN(v) && parseFloat(v) >= d.start && parseFloat(v) <= d.end;
                    case 'int':     return !isNaN(v) && parseInt(v) >= d.start && parseInt(v) <= d.end;
                    case 'string':
                    default:        return v >= d.start && v <= d.end;
                }
            },
            size:function(v,d){
                return $.isEmpty(v) || ((d.end) ? v.length >= d.start && v.length <= d.end : v.length === d.start);
            },
            type:function(v,t){

if($.isEmpty(v)){ return true; }

switch(t){
                    case 'boolean': return /^(true)|(false)$/i.test(v);
                    case 'date':    return !isNaN(Date.parse(v));
                    case 'float':   return !isNaN(parseFloat(v));
                    case 'int':     return !isNaN(parseInt(v)) && /^-?[0-9]+$/.test(v);
                    case 'string':  return v.constructor === String;
                    default:        throw(t + " is not a valid field type");
                }
            },
            url:function(v){
                return $.isEmpty(v) || /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/.test(v);
            },
            validator:function(v,f,e){
                return $.isEmpty(v) || f(v,e);
            }
        };
        
        /*-------------------------------------------------------------------------
         *
         *  Manipulate Constraints
         *
         *-------------------------------------------------------------------------
         *
         *  Helper function that wraps the default pre and post functionality.
         *
         *  Accepts a target element and a processing function that accepts the 
         *  constraint cache and constratin data cache for that element and allows
         *  you to edit it before setting the values back to the cache.
         *
         *///----------------------------------------------------------------------        
        var manipulateConstraints = function(el, f){
            
            var c = $(el).data("constraints") || {};
            var cd = $(el).data("constraint-data") || {};

f(c, cd);

$(el).data("constraints", c);
            $(el).data("constraint-data", cd);                        
        };
        
        /*-------------------------------------------------------------------------
         *
         *  Has Constraints?
         *
         *-------------------------------------------------------------------------
         *
         *  Helper function that d
         *
         *///----------------------------------------------------------------------        
        var hasConstraint = function(el,constraint){
            return !!($(el).data("constraints") || {})[constraint];
        }        
        
        /*-------------------------------------------------------------------------
         *
         *  Initialisation
         *
         *-------------------------------------------------------------------------
         *
         *  Set up the initial state of the Constraint Service.
         *
         *///----------------------------------------------------------------------         
        var availableConstraints = $.extend({},defaultConstraints);
        
        /*-------------------------------------------------------------------------
         *
         *  Constraint Service Public API
         *
         *-------------------------------------------------------------------------
         *
         *  Publically available functions for the Constraints Service
         *
         *///----------------------------------------------------------------------         
        return {
        
            /*---------------------------------------------------------------------
             *
             *  Register Constraint
             *
             *---------------------------------------------------------------------
             *
             *  Registers a single constraint with the Constraint Service so it 
             *  can be used going forward by fields
             *
             *  @param name - name of the constraint to apply
             *  @param test - test function for constraint
             *
             *///------------------------------------------------------------------        
            register: function(name, test){                
                availableConstraints[name] = test;
            },
            
            /*---------------------------------------------------------------------
             *
             *  Register Constraints
             *
             *---------------------------------------------------------------------
             *
             *  Registers a group of constraints at one time.  Takes a map of name
             *  function pairs and applies it to the available constraints
             *
             *  @param constraints - {name:test,...} map of constraints
             *
             *///------------------------------------------------------------------             
            registerAll: function(constraints){
                $.extend(availableConstraints, constraints);
            },
            
            /*---------------------------------------------------------------------
             *
             *  Get Constraint Test
             *
             *---------------------------------------------------------------------
             *
             *  Returns a, if defined, the associated constratin test funciton 
             *  otherwise it returns undefined.
             *
             *  @param name - name of constaint to return
             *
             *///------------------------------------------------------------------                         
            get: function(name){
                return availableConstraints[name];
            },
            
            /*---------------------------------------------------------------------
             *
             *  Bind Constraint
             *
             *---------------------------------------------------------------------
             *
             *  Performs constraint binding work on the passed in element.  More
             *  specifically it loads and cahces the constraint and data on to the
             *  element so the global constraint function can manipulate it.
             *
             *  @param element - target element to bind constraint to
             *  @param constraint - name/id of constraint to apply             
             *  @param data - constratin data applicable to bound contraint
             *
             *///------------------------------------------------------------------                         
            bind: function(element, constraint, data){            
                manipulateConstraints(element, function(constraints,constraintData){
                    constraints[constraint] = ConstraintService.get(constraint);
                    constraintData[constraint] = data;
                });
            },
            
            /*---------------------------------------------------------------------
             *
             *  Unbind Constraint
             *
             *---------------------------------------------------------------------
             *
             *  Removes the constraint from the passed in element including data
             *
             *  @param element - target element to remove constraint from
             *  @param constraint - name/id of constraint to remover                      
             *
             *///------------------------------------------------------------------                                     
            unbind: function(element, constraint){
                manipulateConstraints(element, function(constraints,constraintData){
                    delete(constraints[constraint]);
                    delete(constraintData[constraint]);
                });                
            },
            
            /*---------------------------------------------------------------------
             *
             *  Unbind All Constraints
             *
             *---------------------------------------------------------------------
             *
             *  Globally unbinds constraint from all elements under the passed in
             *  root element (document is default).
             *
             *  @param constraint - name/id of constraint to remove     
             *  @param root - the root element to begin removal     
             *
             *///------------------------------------------------------------------              
            unbindAll : function(constraint, root){
                $.annotated("@Constraints", root).each(function(){
                    if(hasConstraint(this,constraint)){
                        ConstraintService.unbind(this, constraint);
                    }
                });
            },
            
            /*---------------------------------------------------------------------
             *
             *  Unconstrain
             *
             *---------------------------------------------------------------------
             *
             *  Removes constraint related data and events from the element
             *
             *  @param root - the root element to begin removal     
             *
             *///------------------------------------------------------------------             
            unconstrain : function(el){

/* remove data */
                $(el).removeData("constraints");
                $(el).removeData("constraint-data");

/* unbind events */
                $(el).unbind(this.constraintTrigger, constraintCallback);

/* delete dom expando's */
                delete(el.constraintTrigger);                
            },
            
            /*---------------------------------------------------------------------
             *
             *  Unconstrain All
             *
             *---------------------------------------------------------------------
             *
             *  Globally destroys all constraints including data and events
             *
             *  @param root - the root element to begin removal     
             *
             *///------------------------------------------------------------------                                      
            unconstrainAll : function(root){
                $.annotated("@Constraints", root).each(function(){
                    ConstraintService.unconstrain(this)
                });
            }
        }
    }();
    
    /*-----------------------------------------------------------------------------
     *
     *  Message Source
     *
     *-----------------------------------------------------------------------------
     *
     *  This Singleton encapsulates message source functionaltiy related 
     *  specifically to loading messages for constraints.
     *
     *  @constructor
     *
     *///--------------------------------------------------------------------------   
    var MessageSource = (function(){

/*-------------------------------------------------------------------------
         *
         *  Default Messages
         *
         *-------------------------------------------------------------------------
         *
         *  This map the default messages that should be applied to a 
         *  field when there are no custom messages to be applied to a failed 
         *  constraint.
         *
         *///----------------------------------------------------------------------           
        var defaultMessages = {
            alpha        : "${field} must be composed of alpha characters A-Z,a-z",
            alphaNumeric : "${field} must be composed of alphanumeric characters A-Z,a-z,0-9",
            mandatory    : "${field} is a mandatory field",
            creditCard   : "${field} must be a valid credit card number",
            currency     : "${value} is not a valid currency format",
            digitsOnly   : "${field} must be composed of only digits",
            email        : "${field} must be a valid email address",
            indexed      : "${field} is indexed and no indexed fields contain values",
            inList       : "${field} must be one of the following values: ${data}",
            ip           : "${field} must be a valid IP Address",
            matches      : "${field} does not match the required expression",
            max          : "${field} cannot exceed ${data}",
            maxSize      : "${field} cannot exceeds the maximum length (${data})",
            min          : "${field} cannot be less than ${data}",
            minSize      : "${field} cannot is less than the minimum length (${data})",
            notEqual     : "${field} cannot have the value of ${value}",
            range        : "${field} must be between ${start} and ${end}",
            size         : "${field} is not the stated size",
            type         : "${field} is not the correct type (${data})",
            url          : "${field} must be a valid URL",
            validator    : "${field} has failed custom validation"
        };
        
        var ms = {"default":defaultMessages}
                
        /*-------------------------------------------------------------------------
         *
         *  Format Message Function
         *
         *-------------------------------------------------------------------------
         *
         *  Private function to apply data to a templated message
         *
         *  @param m - the unformatted message
         *  @param e - the element in question
         *  @param k - the key for the data-cache to get extra data from
         *  @param d - the data-cache for extra template options
         *
         *///----------------------------------------------------------------------    
        var formatMessage = function(m,e,k,d){

var cdata = ((d) ? d[k] : null) || {};

if(cdata.constructor !== Object){
                cdata = {data : cdata}
            }

var data = $.extend({}, {field:e.id || e.name, value: $(e).val()}, cdata), fm = m;

for(d in data){
                fm = fm.replace(new RegExp('\\${'+d+'}','g'), data[d].toString());
            }

return fm;
        };  
        
        return {   
        
            /*---------------------------------------------------------------------
             *
             *  Get Message Function
             *
             *---------------------------------------------------------------------
             *
             *  This function interrogates a passed element and returns a the 
             *  message that most closely matches the proximity.  If 
             *  <element_name/element_id>.<k>  exists then this is returned as an 
             *  evaluated message.  Otherwise it looks up the global default 
             *  message default.<key>.
             *
             *  @param e - source element
             *  @param k - key for the message
             *
             *///------------------------------------------------------------------
            getMessage:function(e,k){
                return formatMessage(((e && e.id && ms[e.id])?ms[e.id][k]:ms["default"][k]) || "",e,k,(e)?$(e).data("constaint-data"):null);
            },
            
            /*---------------------------------------------------------------------
             *
             *  Add Messages Function
             *
             *---------------------------------------------------------------------
             *
             *  Add new custom messages to the messageSource
             *
             *///------------------------------------------------------------------            
            addMessages:function(c){
                ms = $.extend(true,ms,c);
            },
            
            /*---------------------------------------------------------------------
             *
             *  Add Message Function
             *
             *---------------------------------------------------------------------
             *
             *  Add a new custom message to the messageSource
             *
             *///------------------------------------------------------------------              
            addMessage: function(namespace, msg){
                MessageSource.addMessages({namespace:msg});
            },
            
            /*---------------------------------------------------------------------
             *
             *  Remove Namespace Function
             *
             *---------------------------------------------------------------------
             *
             *  Delete an entire namespace from the messageSource
             *
             *///------------------------------------------------------------------            
            removeNamespace: function(namespace){
                delete(ms[namespace]);
            },
            
            /*---------------------------------------------------------------------
             *
             *  Remove Message Function
             *
             *---------------------------------------------------------------------
             *
             *  Delete a single message from a certain namespace.  Will also
             *  remove the namespace if it is empty.
             *
             *///------------------------------------------------------------------            
            removeMessage: function(namespace, msg){
            
                delete(ms[namespace][msg]);                
            
                for(t in ms[namespace]){
                    return undefined;
                }                
            
                removeNamespace(ms[namespace]);                
            }
        };       
    })();
    
    /*-----------------------------------------------------------------------------
     *
     *  Constraints Callback
     *
     *-----------------------------------------------------------------------------
     *
     *  Handles the constratint management when a constraint action is triggered.
     *
     *///--------------------------------------------------------------------------     
    function constraintCallback(event){
        
        var cs = $(this).data("constraints");
        var cd = $(this).data("constraint-data");

var failedConstraints = [];

for(c in cs){

var pass = cs[c]($(this).val(), cd[c], this);

if(!pass){

failedConstraints.push({
                    constraint : c,
                    message    : MessageSource.getMessage(this,c)
                });

if(event.data.stopOnFirst){ break; }
            }
        }

event.data[(failedConstraints.length > 0)?'errorFn':'successFn'](this, failedConstraints);
    }       
    
    /*-----------------------------------------------------------------------------
     *
     *  Constraints Public API
     *
     *-----------------------------------------------------------------------------
     *
     *  Extend the core jQuery object to allow access to the public functions
     *  for the Constraint functionality
     *
     *///-------------------------------------------------------------------------- 
    $.extend({         
    
        /* 
         * fn.constrain
         * fn.unconstrain
         * constrainForm
         * unconstrainForm
         */
         
        cs : {
        
            //-- DEFAULT OPTIONS API ----------------------------------------------
            defaultOptions         : defaultOptions,

//-- CONSTRAINT SERVICE API -------------------------------------------
            register               : ConstraintService.register,
            registerAll            : ConstraintService.registerAll,
            bind                   : ConstraintService.bind,
            unbind                 : ConstraintService.unbind,
            unconstrain            : ConstraintService.unconstrain,
            unconstrainAll         : ConstraintService.unconstrainAll,
                        
            //-- MESSAGE SOURCE API -----------------------------------------------
            addMessages            : MessageSource.addMessages,
            addMessage             : MessageSource.addMessage,
            getMessage             : MessageSource.getMessage,
            deleteMessage          : MessageSource.removeMessage,
            deleteMessageNamespace : MessageSource.removeNamespace,
            
            /*---------------------------------------------------------------------
             *
             *  Unistall Constrains plugin
             *
             *---------------------------------------------------------------------
             *
             *  Unistall the entire plugin by deregistering all events and data
             *  caches in the document but also delete the objects from memory.
             *
             *///------------------------------------------------------------------ 
            uninstall: function(){
               
               /* remove constraint data and events */
               ConstraintService.unconstrainAll(document);
               
               /* delete the object from global object */
               delete(constraintCallback);
               delete(MessageSource);
               delete(ConstraintService);
               delete(defaultOptions);
               delete($.isEmpty);
               delete($.constrainForm);
               delete($.unconstrainForm);
               delete($.fn.constrain);
               delete($.fn.unconstrain);
               delete($.constraints);
            }
        }
    });
    
})(jQuery);

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