# Yahoo! UI Library

### widget-stdmod 3.0.0

Yahoo! UI Library > widget-stdmod > Widget-StdMod.js (source view)
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    /**
     * Provides standard module support for Widgets through an extension.
     *
     * @module widget-stdmod
     */
        var L = Y.Lang,
            Node = Y.Node,
            NodeList = Y.NodeList,
            UA = Y.UA,
            Widget = Y.Widget,

            EMPTY = "",
            HD = "hd",
            BD = "bd",
            FT = "ft",
            HEADER = "header",
            BODY = "body",
            FOOTER = "footer",
            FILL_HEIGHT = "fillHeight",
            STDMOD = "stdmod",

            PX = "px",
            NODE_SUFFIX = "Node",
            CONTENT_SUFFIX = "Content",
            INNER_HTML = "innerHTML",
            FIRST_CHILD = "firstChild",
            CHILD_NODES = "childNodes",
            CREATE_DOCUMENT_FRAGMENT = "createDocumentFragment",
            OWNER_DOCUMENT = "ownerDocument",

            CONTENT_BOX = "contentBox",
            BOUNDING_BOX = "boundingBox",

            HEIGHT = "height",
            OFFSET_HEIGHT = "offsetHeight",
            AUTO = "auto",

            HeaderChange = "headerContentChange",
            BodyChange = "bodyContentChange",
            FooterChange = "footerContentChange",
            FillHeightChange = "fillHeightChange",
            HeightChange = "HeightChange",
            ContentUpdate = "contentUpdate",

            RENDERUI = "renderUI",
            BINDUI = "bindUI",
            SYNCUI = "syncUI",

            UI = Y.Widget.UI_SRC;

        /**
         * Widget extension, which can be used to add Standard Module support to the
         * base Widget class, through the <a href="Base.html#method_build">Base.build</a>
         * method.
         * <p>
         * The extension adds header, body and footer sections to the Widget's content box and
         * provides the corresponding methods and attributes to modify the contents of these sections.
         * </p>
         * @class WidgetStdMod
         * @param {Object} The user configuration object
         */
        function StdMod(config) {

            this._stdModNode = this.get(CONTENT_BOX);

            Y.after(this._renderUIStdMod, this, RENDERUI);
            Y.after(this._bindUIStdMod, this, BINDUI);
            Y.after(this._syncUIStdMod, this, SYNCUI);
        }

        /**
         * Constant used to refer the the standard module header, in methods which expect a section specifier
         *
         * @property WidgetStdMod.HEADER
         * @static
         * @type String
         */
        StdMod.HEADER = HEADER;
        /**
         * Constant used to refer the the standard module body, in methods which expect a section specifier
         *
         * @property WidgetStdMod.BODY
         * @static
         * @type String
         */
        StdMod.BODY = BODY;
        /**
         * Constant used to refer the the standard module footer, in methods which expect a section specifier
         *
         * @property WidgetStdMod.FOOTER
         * @static
         * @type String
         */
        StdMod.FOOTER = FOOTER;

        /**
         * Constant used to specify insertion position, when adding content to sections of the standard module in
         * methods which expect a "where" argument.
         * <p>
         * Inserts new content <em>before</em> the sections existing content.
         * </p>
         * @property WidgetStdMod.AFTER
         * @static
         * @type String
         */
        StdMod.AFTER = "after";

        /**
         * Constant used to specify insertion position, when adding content to sections of the standard module in
         * methods which expect a "where" argument.
         * <p>
         * Inserts new content <em>before</em> the sections existing content.
         * </p>
         * @property WidgetStdMod.BEFORE
         * @static
         * @type String
         */
        StdMod.BEFORE = "before";
        /**
         * Constant used to specify insertion position, when adding content to sections of the standard module in
         * methods which expect a "where" argument.
         * <p>
         * <em>Replaces</em> the sections existing content, with new content.
         * </p>
         * @property WidgetStdMod.REPLACE
         * @static
         * @type String
         */
        StdMod.REPLACE = "replace";

        var STD_HEADER = StdMod.HEADER,
            STD_BODY = StdMod.BODY,
            STD_FOOTER = StdMod.FOOTER,
            AFTER = StdMod.AFTER,
            BEFORE = StdMod.BEFORE;

        /**
         * Static property used to define the default attribute
         * configuration introduced by WidgetStdMod.
         *
         * @property WidgetStdMod.ATTRS
         * @type Object
         * @static
         */
        StdMod.ATTRS = {

            /**
             * @attribute headerContent
             * @type {String | Node}
             * @default undefined
             * @description The content to be added to the header section. This will replace any existing content
             * in the header. If you want to append, or insert new content, use the <a href="#method_setStdModContent">setStdModContent</a> method.
             */
            headerContent: {
                value:null
            },

            /**
             * @attribute footerContent
             * @type {String | Node}
             * @default undefined
             * @description The content to be added to the footer section. This will replace any existing content
             * in the footer. If you want to append, or insert new content, use the <a href="#method_setStdModContent">setStdModContent</a> method.
             */
            footerContent: {
                value:null
            },

            /**
             * @attribute bodyContent
             * @type {String | Node}
             * @default undefined
             * @description The content to be added to the body section. This will replace any existing content
             * in the body. If you want to append, or insert new content, use the <a href="#method_setStdModContent">setStdModContent</a> method.
             */
            bodyContent: {
                value:null
            },

            /**
             * @attribute fillHeight
             * @type {String}
             * @default WidgetStdMod.BODY
             * @description The section (WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER) which should be resized to fill the height of the standard module, when a
             * height is set on the Widget. If a height is not set on the widget, then all sections are sized based on
             * their content.
             */
            fillHeight: {
                value: StdMod.BODY,
                validator: function(val) {
                     return this._validateFillHeight(val);
                }
            }
        };

        /**
         * The HTML parsing rules for the WidgetStdMod class.
         *
         * @property WidgetStdMod.HTML_PARSER
         * @static
         * @type Object
         */
        StdMod.HTML_PARSER = {
            headerContent: function(contentBox) {
                return this._parseStdModHTML(STD_HEADER);
            },

            bodyContent: function(contentBox) {
                return this._parseStdModHTML(STD_BODY);
            },

            footerContent : function(contentBox) {
                return this._parseStdModHTML(STD_FOOTER);
            }
        };

        /**
         * Static hash of default class names used for the header,
         * body and footer sections of the standard module, keyed by
         * the section identifier (WidgetStdMod.STD_HEADER, WidgetStdMod.STD_BODY, WidgetStdMod.STD_FOOTER)
         *
         * @property WidgetStdMod.SECTION_CLASS_NAMES
         * @static
         * @type Object
         */
        StdMod.SECTION_CLASS_NAMES = {
            header: Widget.getClassName(HD),
            body: Widget.getClassName(BD),
            footer: Widget.getClassName(FT)
        };

        /**
         * The template HTML strings for each of the standard module sections. Section entries are keyed by the section constants,
         * WidgetStdMod.HEADER, WidgetStdMod.BODY, WidgetStdMod.FOOTER, and contain the HTML to be added for each section.
         * e.g.
         * <pre>
         *    {
         *       header : '&lt;div class="yui-widget-hd"&gt;&lt;/div&gt;',
         *       body : '&lt;div class="yui-widget-bd"&gt;&lt;/div&gt;',
         *       footer : '&lt;div class="yui-widget-ft"&gt;&lt;/div&gt;'
         *    }
         * </pre>
         * @property WidgetStdMod.TEMPLATES
         * @type Object
         * @static
         */
        StdMod.TEMPLATES = {
            header : '<div class="' + StdMod.SECTION_CLASS_NAMES[STD_HEADER] + '"></div>',
            body : '<div class="' + StdMod.SECTION_CLASS_NAMES[STD_BODY] + '"></div>',
            footer : '<div class="' + StdMod.SECTION_CLASS_NAMES[STD_FOOTER] + '"></div>'
        };

        StdMod.prototype = {

            /**
             * Synchronizes the UI to match the Widgets standard module state.
             * <p>
             * This method is invoked after syncUI is invoked for the Widget class
             * using YUI's aop infrastructure.
             * </p>
             * @method _syncUIStdMod
             * @protected
             */
            _syncUIStdMod : function() {
                this._uiSetStdMod(STD_HEADER, this.get(STD_HEADER + CONTENT_SUFFIX));
                this._uiSetStdMod(STD_BODY, this.get(STD_BODY + CONTENT_SUFFIX));
                this._uiSetStdMod(STD_FOOTER, this.get(STD_FOOTER + CONTENT_SUFFIX));
                this._uiSetFillHeight(this.get(FILL_HEIGHT));
            },

            /**
             * Creates/Initializes the DOM for standard module support.
             * <p>
             * This method is invoked after renderUI is invoked for the Widget class
             * using YUI's aop infrastructure.
             * </p>
             * @method _renderUIStdMod
             * @protected
             */
            _renderUIStdMod : function() {
                this._stdModNode.addClass(Widget.getClassName(STDMOD));
            },

            /**
             * Binds event listeners responsible for updating the UI state in response to
             * Widget standard module related state changes.
             * <p>
             * This method is invoked after bindUI is invoked for the Widget class
             * using YUI's aop infrastructure.
             * </p>
             * @method _bindUIStdMod
             * @protected
             */
            _bindUIStdMod : function() {
                this.after(HeaderChange, this._afterHeaderChange);
                this.after(BodyChange, this._afterBodyChange);
                this.after(FooterChange, this._afterFooterChange);

                this.after(FillHeightChange, this._afterFillHeightChange);
                this.after(HeightChange, this._fillHeight);
                this.after(ContentUpdate, this._fillHeight);
            },

            /**
             * Default attribute change listener for the headerContent attribute, responsible
             * for updating the UI, in response to attribute changes.
             *
             * @method _afterHeaderChange
             * @protected
             * @param {EventFacade} e The event facade for the attribute change
             */
            _afterHeaderChange : function(e) {
                if (e.src !== UI) {
                    this._uiSetStdMod(STD_HEADER, e.newVal, e.stdModPosition);
                }
            },

            /**
             * Default attribute change listener for the bodyContent attribute, responsible
             * for updating the UI, in response to attribute changes.
             *
             * @method _afterBodyChange
             * @protected
             * @param {EventFacade} e The event facade for the attribute change
             */
            _afterBodyChange : function(e) {
                if (e.src !== UI) {
                    this._uiSetStdMod(STD_BODY, e.newVal, e.stdModPosition);
                }
            },

            /**
             * Default attribute change listener for the footerContent attribute, responsible
             * for updating the UI, in response to attribute changes.
             *
             * @method _afterFooterChange
             * @protected
             * @param {EventFacade} e The event facade for the attribute change
             */
            _afterFooterChange : function(e) {
                if (e.src !== UI) {
                    this._uiSetStdMod(STD_FOOTER, e.newVal, e.stdModPosition);
                }
            },

            /**
             * Default attribute change listener for the fillHeight attribute, responsible
             * for updating the UI, in response to attribute changes.
             *
             * @method _afterFillHeightChange
             * @protected
             * @param {EventFacade} e The event facade for the attribute change
             */
            _afterFillHeightChange: function (e) {
                this._uiSetFillHeight(e.newVal);
            },

            /**
             * Default validator for the fillHeight attribute. Verifies that the
             * value set is a valid section specifier - one of WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER,
             * or a falsey value if fillHeight is to be disabled.
             *
             * @method _validateFillHeight
             * @protected
             * @param {String} val The section which should be setup to fill height, or false/null to disable fillHeight
             * @return true if valid, false if not
             */
            _validateFillHeight : function(val) {
                return !val || val == StdMod.BODY || val == StdMod.HEADER || val == StdMod.FOOTER;
            },

            /**
             * Updates the rendered UI, to resize the provided section so that the standard module fills out
             * the specified widget height. Note: This method does not check whether or not a height is set
             * on the Widget.
             *
             * @method _uiSetFillHeight
             * @protected
             * @param {String} fillSection A valid section specifier - one of WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER
             */
            _uiSetFillHeight : function(fillSection) {
                var fillNode = this.getStdModNode(fillSection);
                var currNode = this._currFillNode;

                if (currNode && fillNode !== currNode){
                    currNode.setStyle(HEIGHT, EMPTY);
                }

                if (fillNode) {
                    this._currFillNode = fillNode;
                }

                this._fillHeight();
            },

            /**
             * Updates the rendered UI, to resize the current section specified by the fillHeight attribute, so
             * that the standard module fills out the Widget height. If a height has not been set on Widget,
             * the section is not resized (height is set to "auto").
             *
             * @method _fillHeight
             * @private
             */
            _fillHeight : function() {
                if (this.get(FILL_HEIGHT)) {
                    var height = this.get(HEIGHT);
                    if (height != EMPTY && height != AUTO) {
                        this.fillHeight(this._currFillNode);
                    }
                }
            },

            /**
             * Updates the rendered UI, adding the provided content (either an HTML string, or node reference),
             * to the specified section. The content is either added before, after or replaces existing content
             * in the section, based on the value of the <code>where</code> argument.
             *
             * @method _uiSetStdMod
             * @protected
             *
             * @param {String} section The section to be updated. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
             * @param {String | Node} content The new content (either as an HTML string, or Node reference) to add to the section
             * @param {String} where Optional. Either WidgetStdMod.AFTER, WidgetStdMod.BEFORE or WidgetStdMod.REPLACE.
             * If not provided, the content will replace existing content in the section.
             */
            _uiSetStdMod : function(section, content, where) {
                if (content) {
                    var node = this.getStdModNode(section) || this._renderStdMod(section);
                    if (content instanceof Node || content instanceof NodeList) {
                        this._addNodeRef(node, content, where);
                    } else {
                        this._addNodeHTML(node, content, where);
                    }
                    this.set(section + CONTENT_SUFFIX, this._getStdModContent(section), {src:UI});
                    this.fire(ContentUpdate);
                }
            },

            /**
             * Creates the DOM node for the given section, and inserts it into the correct location in the contentBox.
             *
             * @method _renderStdMod
             * @protected
             * @param {String} section The section to create/render. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
             * @return {Node} A reference to the added section node
             */
            _renderStdMod : function(section) {

                var contentBox = this.get(CONTENT_BOX),
                    sectionNode = this._findStdModSection(section);

                if (!sectionNode) {
                    sectionNode = this._getStdModTemplate(section);
                }

                this._insertStdModSection(contentBox, section, sectionNode);

                this[section + NODE_SUFFIX] = sectionNode;
                return this[section + NODE_SUFFIX];
            },

            /**
             * Helper method to insert the Node for the given section into the correct location in the contentBox.
             *
             * @method _insertStdModSection
             * @private
             * @param {Node} contentBox A reference to the Widgets content box.
             * @param {String} section The section to create/render. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
             * @param {Node} sectionNode The Node for the section.
             */
            _insertStdModSection : function(contentBox, section, sectionNode) {
                var fc = contentBox.get(FIRST_CHILD);

                if (section === STD_FOOTER || !fc) {
                    contentBox.appendChild(sectionNode);
                } else {
                    if (section === STD_HEADER) {
                        contentBox.insertBefore(sectionNode, fc);
                    } else {
                        // BODY
                        var footer = this[STD_FOOTER + NODE_SUFFIX];
                        if (footer) {
                            contentBox.insertBefore(sectionNode, footer);
                        } else {
                            contentBox.appendChild(sectionNode);
                        }
                    }
                }
            },

            /**
             * Gets a new Node reference for the given standard module section, by cloning
             * the stored template node.
             *
             * @method _getStdModTemplate
             * @protected
             * @param {String} section The section to create a new node for. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
             * @return {Node} The new Node instance for the section
             */
            _getStdModTemplate : function(section) {
                return Node.create(StdMod.TEMPLATES[section], this._stdModNode.get(OWNER_DOCUMENT));
            },

            /**
             * Helper method to add the given HTML string to the node reference provided.
             * The HTML is added either before, after or replaces the existing node content
             * based on the value of the <code>where</code> argument.
             *
             * @method _addNodeHTML
             * @private
             *
             * @param {Node} node The section Node to be updated.
             * @param {String} html The new content HTML string to be added to the section Node.
             * @param {String} where Optional. Either WidgetStdMod.AFTER, WidgetStdMod.BEFORE or WidgetStdMod.REPLACE.
             * If not provided, the content will replace Nodes existing content.
             */
            _addNodeHTML : function(node, html, where) {
                if (where == AFTER) {
                    node.set(INNER_HTML, node.get(INNER_HTML) + html);
                } else if (where == BEFORE) {
                    node.set(INNER_HTML, html + node.get(INNER_HTML));
                } else {
                    node.set(INNER_HTML, html);
                }
            },

            /**
             * Helper method to add nodes, to another node.
             * The child node(s) are added either before, after or replaces the existing node content
             * based on the value of the <code>where</code> argument.
             *
             * @method _addNodeRef
             * @private
             *
             * @param {Node} node The section Node to be updated.
             * @param {Node|NodeList} children The new content Node, or NodeList to be added to section Node provided.
             * @param {String} where Optional. Either WidgetStdMod.AFTER, WidgetStdMod.BEFORE or WidgetStdMod.REPLACE.
             * If not provided, the content will replace existing content in the Node.
             */
            _addNodeRef : function(node, children, where) {
                var append = true,
                    i, s;

                if (where == BEFORE) {
                    var n = node.get(FIRST_CHILD);
                    if (n) {
                        if (children instanceof NodeList) {
                            for (i = children.size() - 1; i >=0; --i) {
                                node.insertBefore(children.item(i), n);
                            }
                        } else {
                            node.insertBefore(children, n);
                        }
                        append = false;
                    }
                } else if (where != AFTER) { // replace
                    node.set(INNER_HTML, EMPTY);
                }

                if (append) {
                    if (children instanceof NodeList) {
                        for (i = 0, s = children.size(); i < s; ++i) {
                            node.appendChild(children.item(i));
                        }
                    } else {
                        node.appendChild(children);
                    }
                }
            },

            /**
             * Helper method to obtain the precise height of the node provided, including padding and border.
             * The height could be a sub-pixel value for certain browsers, such as Firefox 3.
             *
             * @method _getPreciseHeight
             * @private
             * @param {Node} node The node for which the precise height is required.
             * @return {Number} The height of the Node including borders and padding, possibly a float.
             */
            _getPreciseHeight : function(node) {
                var height = (node) ? node.get(OFFSET_HEIGHT) : 0,
                    getBCR = "getBoundingClientRect";

                if (node && node.hasMethod(getBCR)) {
                    var preciseRegion = node.invoke(getBCR);
                    if (preciseRegion) {
                        height = preciseRegion.bottom - preciseRegion.top;
                    }
                }

                return height;
            },

            /**
             * Helper method to query the rendered contents of the contentBox to find the
             * node for the given section if it exists.
             *
             * @method _findStdModSection
             * @private
             * @param {String} section The section for which the render Node is to be found. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
             * @return {Node} The rendered node for the given section, or null if not found.
             */
            _findStdModSection: function(section) {
                return this.get(CONTENT_BOX).query("> ." + StdMod.SECTION_CLASS_NAMES[section]);
            },

            /**
             * Utility method, used by WidgetStdMods HTML_PARSER implementation
             * to extract data for each section from markup.
             *
             * @method _parseStdModHTML
             * @private
             * @param {String} section
             * @return {String} Inner HTML string with the contents of the section
             */
            _parseStdModHTML : function(section) {
                var node = this._findStdModSection(section),
                    docFrag, children;

                if (node) {
                    docFrag = node.get(OWNER_DOCUMENT).invoke(CREATE_DOCUMENT_FRAGMENT);
                    children = node.get(CHILD_NODES);

                    for (var i = children.size() - 1; i >= 0; i--) {
                        var fc = docFrag.get(FIRST_CHILD);
                        if (fc) {
                            docFrag.insertBefore(children.item(i), fc);
                        } else {
                            docFrag.appendChild(children.item(i));
                        }
                    }

                    return docFrag;
                }

                return null;
            },

            /**
             * Retrieves the child nodes (content) of a standard module section
             *
             * @method _getStdModContent
             * @private
             * @param {String} section The standard module section whose child nodes are to be retrieved. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
             * @return {Node} The child node collection of the standard module section.
             */
            _getStdModContent : function(section) {
                return (this[section + NODE_SUFFIX]) ? this[section + NODE_SUFFIX].get(CHILD_NODES) : null;
            },

            /**
             * Updates the body section of the standard module with the content provided (either an HTML string, or node reference).
             * <p>
             * This method can be used instead of the corresponding section content attribute if you'd like to retain the current content of the section,
             * and insert content before or after it, by specifying the <code>where</code> argument.
             * </p>
             * @method setStdModContent
             * @param {String} section The standard module section whose content is to be updated. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
             * @param {String | Node} content The content to be added, either an HTML string or a Node reference.
             * @param {String} where Optional. Either WidgetStdMod.AFTER, WidgetStdMod.BEFORE or WidgetStdMod.REPLACE.
             * If not provided, the content will replace existing content in the section.
             */
            setStdModContent : function(section, content, where) {
                this.set(section + CONTENT_SUFFIX, content, {stdModPosition:where});
            },

            /**
             * Returns the node reference for the given section. Note: The DOM is not queried for the node reference. The reference
             * stored by the widget instance is returned if set.
             *
             * @method getStdModNode
             * @param {String} section The section whose node reference is required. Either WidgetStdMod.HEADER, WidgetStdMod.BODY or WidgetStdMod.FOOTER.
             * @return {Node} The node reference for the section, or null if not set.
             */
            getStdModNode : function(section) {
                return this[section + NODE_SUFFIX] || null;
            },

            /**
             * Sets the height on the provided header, body or footer element to
             * fill out the height of the Widget. It determines the height of the
             * widgets bounding box, based on it's configured height value, and
             * sets the height of the provided section to fill out any
             * space remaining after the other standard module section heights
             * have been accounted for.
             *
             * <p><strong>NOTE:</strong> This method is not designed to work if an explicit
             * height has not been set on the Widget, since for an "auto" height Widget,
             * the heights of the header/body/footer will drive the height of the Widget.</p>
             *
             * @method fillHeight
             * @param {Node} node The node which should be resized to fill out the height
             * of the Widget bounding box. Should be a standard module section node which belongs
             * to the widget.
             */
            fillHeight : function(node) {
                if (node) {
                    var boundingBox = this.get(BOUNDING_BOX),
                        stdModNodes = [this.headerNode, this.bodyNode, this.footerNode],
                        stdModNode,
                        total = 0,
                        filled = 0,
                        remaining = 0,
                        validNode = false;

                    for (var i = 0, l = stdModNodes.length; i < l; i++) {
                        stdModNode = stdModNodes[i];
                        if (stdModNode) {
                            if (stdModNode !== node) {
                                filled += this._getPreciseHeight(stdModNode);
                            } else {
                                validNode = true;
                            }
                        }
                    }

                    if (validNode) {
                        if (UA.ie || UA.opera) {
                            // Need to set height to 0, to allow height to be reduced
                            node.setStyle(HEIGHT, 0 + PX);
                        }

                        total = parseInt(boundingBox.getComputedStyle(HEIGHT), 10);
                        if (L.isNumber(total)) {
                            remaining = total - filled;

                            if (remaining >= 0) {
                                node.setStyle(HEIGHT, remaining + PX);
                            }

                            // Re-adjust height if required, to account for el padding and border
                            var offsetHeight = this.get(CONTENT_BOX).get(OFFSET_HEIGHT);
                            if (offsetHeight != total) {
                                remaining = remaining - (offsetHeight - total);
                                node.setStyle(HEIGHT, remaining + PX);
                            }
                        }
                    }
                }
            }
        };

        Y.WidgetStdMod = StdMod;

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