# Yahoo! UI Library

### querystring 3.3.0

Yahoo! UI Library > querystring > querystring-stringify.js (source view)
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    /**
     * Provides Y.QueryString.stringify method for converting objects to Query Strings.
     *
     * @module querystring
     * @submodule querystring-stringify
     * @for QueryString
     * @static
     */

    var QueryString = Y.namespace("QueryString"),
        stack = [],
        L = Y.Lang;

    /**
     * Provides Y.QueryString.escape method to be able to override default encoding
     * method.  This is important in cases where non-standard delimiters are used, if
     * the delimiters would not normally be handled properly by the builtin
     * (en|de)codeURIComponent functions.
     * Default: encodeURIComponent
     * @module querystring
     * @submodule querystring-stringify
     * @for QueryString
     * @static
     **/
    QueryString.escape = encodeURIComponent;

    /**
     * <p>Converts an arbitrary value to a Query String representation.</p>
     *
     * <p>Objects with cyclical references will trigger an exception.</p>
     *
     * @method stringify
     * @public
     * @param obj {Variant} any arbitrary value to convert to query string
     * @param cfg {Object} (optional) Configuration object.  The three
     * supported configurations are:
     * <ul><li>sep: When defined, the value will be used as the key-value
     * separator.  The default value is "&".</li>
     * <li>eq: When defined, the value will be used to join the key to
     * the value.  The default value is "=".</li>
     * <li>arrayKey: When set to true, the key of an array will have the
     * '[]' notation appended to the key.  The default value is false.
     * </li></ul>
     * @param name {String} (optional) Name of the current key, for handling children recursively.
     * @static
     */
    QueryString.stringify = function (obj, c, name) {
        var begin, end, i, l, n, s,
            sep = c && c.sep ? c.sep : "&",
            eq = c && c.eq ? c.eq : "=",
            aK = c && c.arrayKey ? c.arrayKey : false;

        if (L.isNull(obj) || L.isUndefined(obj) || L.isFunction(obj)) {
            return name ? QueryString.escape(name) + eq : '';
        }

        if (L.isBoolean(obj) || Object.prototype.toString.call(obj) === '[object Boolean]') {
            obj =+ obj;
        }

        if (L.isNumber(obj) || L.isString(obj)) {
            // Y.log("Number or string: "+obj);
            return QueryString.escape(name) + eq + QueryString.escape(obj);
        }

        if (L.isArray(obj)) {
            s = [];
            name = aK ? name + '[]' : name;
            l = obj.length;
            for (i = 0; i < l; i++) {
                s.push( QueryString.stringify(obj[i], c, name) );
            }

            return s.join(sep);
        }
        // now we know it's an object.
        // Y.log(
        //     typeof obj + (typeof obj === 'object' ? " ok" : "ONOES!")+
        //     Object.prototype.toString.call(obj)
        // );

        // Check for cyclical references in nested objects
        for (i = stack.length - 1; i >= 0; --i) {
            if (stack[i] === obj) {
                throw new Error("QueryString.stringify. Cyclical reference");
            }
        }

        stack.push(obj);
        s = [];
        begin = name ? name + '[' : '';
        end = name ? ']' : '';
        for (i in obj) {
            if (obj.hasOwnProperty(i)) {
                n = begin + i + end;
                s.push(QueryString.stringify(obj[i], c, n));
            }
        }

        stack.pop();
        s = s.join(sep);
        if (!s && name) {
            return name + "=";
        }

        return s;
    };

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