# Yahoo! UI Library

### dom 3.0.0b1

Yahoo! UI Library > dom > dom-style.js (source view)
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    (function(Y) {
    /**
     * Add style management functionality to DOM.
     * @module dom
     * @submodule dom-style
     * @for DOM
     */

    var DOCUMENT_ELEMENT = 'documentElement',
        DEFAULT_VIEW = 'defaultView',
        OWNER_DOCUMENT = 'ownerDocument',
        STYLE = 'style',
        FLOAT = 'float',
        CSS_FLOAT = 'cssFloat',
        STYLE_FLOAT = 'styleFloat',
        TRANSPARENT = 'transparent',
        GET_COMPUTED_STYLE = 'getComputedStyle',

        DOCUMENT = Y.config.doc,
        UNDEFINED = undefined,

        re_color = /color$/i;

    Y.mix(Y.DOM, {
        CUSTOM_STYLES: {
        },

        /**
         * Sets a style property for a given element.
         * @method setStyle
         * @param {HTMLElement} An HTMLElement to apply the style to.
         * @param {String} att The style property to set.
         * @param {String|Number} val The value.
         */
        setStyle: function(node, att, val, style) {
            style = style || node.style;
            var CUSTOM_STYLES = Y.DOM.CUSTOM_STYLES;

            if (style) {
                if (val === null) {
                    val = ''; // normalize for unsetting
                }
                if (att in CUSTOM_STYLES) {
                    if (CUSTOM_STYLES[att].set) {
                        CUSTOM_STYLES[att].set(node, val, style);
                        return; // NOTE: return
                    } else if (typeof CUSTOM_STYLES[att] === 'string') {
                        att = CUSTOM_STYLES[att];
                    }
                }
                style[att] = val;
            }
        },

        /**
         * Returns the current style value for the given property.
         * @method getStyle
         * @param {HTMLElement} An HTMLElement to get the style from.
         * @param {String} att The style property to get.
         */
        getStyle: function(node, att) {
            var style = node[STYLE],
                CUSTOM_STYLES = Y.DOM.CUSTOM_STYLES,
                val = '';

            if (style) {
                if (att in CUSTOM_STYLES) {
                    if (CUSTOM_STYLES[att].get) {
                        return CUSTOM_STYLES[att].get(node, att, style); // NOTE: return
                    } else if (typeof CUSTOM_STYLES[att] === 'string') {
                        att = CUSTOM_STYLES[att];
                    }
                }
                val = style[att];
                if (val === '') { // TODO: is empty string sufficient?
                    val = Y.DOM[GET_COMPUTED_STYLE](node, att);
                }
            }

            return val;
        },

        /**
         * Sets multiple style properties.
         * @method setStyles
         * @param {HTMLElement} node An HTMLElement to apply the styles to.
         * @param {Object} hash An object literal of property:value pairs.
         */
        setStyles: function(node, hash) {
            var style = node.style;
            Y.each(hash, function(v, n) {
                Y.DOM.setStyle(node, n, v, style);
            }, Y.DOM);
        },

        /**
         * Returns the computed style for the given node.
         * @method getComputedStyle
         * @param {HTMLElement} An HTMLElement to get the style from.
         * @param {String} att The style property to get.
         * @return {String} The computed value of the style property.
         */
        getComputedStyle: function(node, att) {
            var val = '',
                doc = node[OWNER_DOCUMENT];

            if (node[STYLE]) {
                val = doc[DEFAULT_VIEW][GET_COMPUTED_STYLE](node, null)[att];
            }
            return val;
        }
    });

    // normalize reserved word float alternatives ("cssFloat" or "styleFloat")
    if (DOCUMENT[DOCUMENT_ELEMENT][STYLE][CSS_FLOAT] !== UNDEFINED) {
        Y.DOM.CUSTOM_STYLES[FLOAT] = CSS_FLOAT;
    } else if (DOCUMENT[DOCUMENT_ELEMENT][STYLE][STYLE_FLOAT] !== UNDEFINED) {
        Y.DOM.CUSTOM_STYLES[FLOAT] = STYLE_FLOAT;
    }

    // fix opera computedStyle default color unit (convert to rgb)
    if (Y.UA.opera) {
        Y.DOM[GET_COMPUTED_STYLE] = function(node, att) {
            var view = node[OWNER_DOCUMENT][DEFAULT_VIEW],
                val = view[GET_COMPUTED_STYLE](node, '')[att];

            if (re_color.test(att)) {
                val = Y.Color.toRGB(val);
            }

            return val;
        };

    }

    // safari converts transparent to rgba(), others use "transparent"
    if (Y.UA.webkit) {
        Y.DOM[GET_COMPUTED_STYLE] = function(node, att) {
            var view = node[OWNER_DOCUMENT][DEFAULT_VIEW],
                val = view[GET_COMPUTED_STYLE](node, '')[att];

            if (val === 'rgba(0, 0, 0, 0)') {
                val = TRANSPARENT;
            }

            return val;
        };

    }
    })(Y);

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