silverstripe-framework/admin/javascript/jquery-changetracker/lib/jquery.changetracker.js

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(function($){
// Copyright (c) 2009, SilverStripe Ltd.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the <organization> nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SilverStripe Ltd. ''AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL SilverStripe Ltd. BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/**
* @class Tracks onchange events on all form fields.
*
* @todo Implement form reset handling
*
* @name jQuery.changetracker
* @author Ingo Schommer, SilverStripe Ltd.
* @license BSD License
*/
$.fn.changetracker = function(_options) {
var self = this;
if(this.length > 1){
this.each(function(i, item) {
this.changetracker(_options);
});
return this;
}
this.defaults = {
fieldSelector: ':input:not(:submit)',
ignoreFieldSelector: "",
changedCssClass: 'changed'
};
var options = $.extend({}, this.defaults, _options);
this.initialize = function() {
// optional metadata plugin support
if ($.meta) options = $.extend({}, options, this.data());
// Flag indicating this form was dirtied by an external component
var dirty = false;
var onchange = function(e) {
var $field = $(e.target);
var origVal = $field.data('changetracker.origVal'), newVal;
// Determine value based on field type
if($field.is(':checkbox')) {
newVal = $field.is(':checked') ? 1 : 0;
} else {
newVal = $field.val();
}
// Determine changed state based on value comparisons
if(origVal === null || newVal != origVal) {
$field.addClass(options.changedCssClass);
self.addClass(options.changedCssClass);
} else {
$field.removeClass(options.changedCssClass);
// Unset changed state on all radio buttons of the same name
if($field.is(':radio')) {
self.find(':radio[name=' + $field.attr('name') + ']').removeClass(options.changedCssClass);
}
// Only unset form state if no other fields are changed as well and the form isn't explicitly dirty
if(!dirty && !self.getFields().filter('.' + options.changedCssClass).length) {
self.removeClass(options.changedCssClass);
}
}
};
// setup original values
var fields = this.getFields(), origVal;
fields.filter(':radio,:checkbox').bind('click.changetracker', onchange);
fields.not(':radio,:checkbox').bind('change.changetracker', onchange);
fields.each(function() {
if($(this).is(':radio,:checkbox')) {
origVal = self.find(':input[name="' + $(this).attr('name') + '"]:checked').val();
if("undefined" === typeof origVal){
origVal = 0;
}
} else {
origVal = $(this).val();
}
$(this).data('changetracker.origVal', origVal);
});
self.bind('dirty.changetracker', function() {
dirty = true;
self.addClass(options.changedCssClass);
});
this.data('changetracker', true);
};
this.destroy = function() {
this.getFields()
.unbind('.changetracker')
.removeClass(options.changedCssClass)
.removeData('changetracker.origVal');
this.unbind('.changetracker')
.removeData('changetracker');
};
/**
* Reset change state of all form fields and the form itself.
*/
this.reset = function() {
this.getFields().each(function() {
self.resetField(this);
});
this.removeClass(options.changedCssClass);
};
/**
* Reset the change single form field.
* Does not reset to the original value.
*
* @param DOMElement field
*/
this.resetField = function(field) {
return $(field).removeData('changetracker.origVal').removeClass('changed');
};
/**
* @return jQuery Collection of fields
*/
this.getFields = function() {
return this.find(options.fieldSelector).not(options.ignoreFieldSelector);
};
// Support invoking "public" methods as string arguments
if (typeof arguments[0] === 'string') {
var property = arguments[1];
var args = Array.prototype.slice.call(arguments);
args.splice(0, 1);
return this[arguments[0]].apply(this, args);
} else {
return this.initialize();
}
};
}(jQuery));