Readonly.js file containing code to enable [readonly] and [hide] functionality in Tridion Schemas

Readonly.js

// Created by Robert Curlette, 18 June, 2013
// Not possible with support of Tridion StackExchange community and these posts:
// http://tridion.stackexchange.com/questions/1810/component-fields-available-in-gui-extension-with-fieldbuilder
// http://tridion.stackexchange.com/questions/1252/gui-extension-to-hide-field-in-2011-sp1
// http://tridion.stackexchange.com/questions/1380/make-schema-fields-read-only-in-tridion-2011-sp1
// http://tridion.stackexchange.com/questions/1915/how-to-get-component-metadata-fields-with-fieldbuilder

var $j = jQuery.noConflict();
if ($display)
{
    (function()
    {
        $evt.addEventHandler($display, "start", Extension$onDisplayStartedReadonly);

        function Extension$onDisplayStartedReadonly()
        {
            $evt.removeEventHandler($display, "start", Extension$onDisplayStartedReadonly);

            var view = $display.getView();
            if (view && Tridion.OO.implementsInterface(view, "Tridion.Cme.Views.Component"))
            {
                var fieldBuilder = view.properties.controls.fieldBuilder;
                $evt.addEventHandler(fieldBuilder, "load", Extension$onDisplayStartedReadonly$_collectProperties);
            }
        };

        function Extension$onDisplayStartedReadonly$_collectProperties(event)
        {
            var fieldBuilder = event && event.source;
            if (fieldBuilder)
            {
		// General Content fields
                var fieldsContainer = fieldBuilder.properties.input;
                var genFieldsNode = fieldsContainer.getElement();
                processFields(genFieldsNode);
			   
		// Metadata fields
		var metaFieldBuilder = GetMetadataFieldbuilder();
		var metaFieldsContainer = metaFieldBuilder.properties.input;
                var metaFieldsNode = metaFieldsContainer.getElement();
                processFields(metaFieldsNode);
            }
        };
		
		// Disable fields with [readonly] or hide fields with [hide] in the field description
		function processFields(fieldsNode)
		{
			 $j(fieldsNode).children().each(function (index, elm)
                {
                    var cntrl = $j('div.input', elm)[0].control;
		    var a = $j(cntrl.getElement()).parent();
					
		    // Read-only for fields containing [readonly] in the field description
		    if ($j(a.children()[0]).text().indexOf("[readonly]") >= 0)
		    {
		        a.children()[1].children[0].disabled = true;
		    }
					
		    // Hide with fields containing [hide] in the field description
		    if ($j(a.children()[0]).text().indexOf("[hide]") >= 0)
	            {
		        $j(cntrl.getElement()).parent().hide();
		    }
                });
		}
		
		// Method created by Alex Klock and provided as an answer in this StackExchange post, http://tridion.stackexchange.com/questions/1915/how-to-get-component-metadata-fields-with-fieldbuilder
		function GetMetadataFieldbuilder()
		{
			var fieldBuilder;
			var tabs = $display.getView().properties.controls.TabControl,
			cardCount = tabs.properties.cards.length,
			fieldBuilder,
			card;

			while (cardCount--) {
				card = tabs.properties.cards[cardCount];
				if (card.getId() === "MetadataTab") {
					fieldBuilder = card.properties.controls.fieldBuilder;
				}
			}
			return fieldBuilder;
		}
    })();
}