/**
 * Inline label v1.2.0
 * Tested with jQuery 1.3.x and 1.4.x.
 * Released under CC-BY-SA http://creativecommons.org/licenses/by-sa/2.5/se/
 * 
 * Usage: 	$('#id').inline_label();
 * 			$('#id').inline_label({text: "yada yada"}); // use text instead of label text
 * 			$('#id').inline_label({use_title: true}); // use the title instead of label text
 * 			$('#id').inline_label({css_class: "my_inline_label"}); // which css-class the field should use
 * 			$('#id').inline_label({hide_label: false}); // whether to hide the label or not
 * 
 * When using the text option, hide_label makes no difference.
 * 
 */
(function($) {

    $.inline_label = function(elem, options) {
        var t = $(elem);
        var text;
        if (options.text) {
            // if a text is defined, use that
            text = options.text;
        } else if (options.use_title) {
            text = t.attr('title');
        } else {
            // otherwise use the labels text
            if (!t.attr('id')) {
                throw "No id attribute found!";
            }
            var label = $('label[for=' + t.attr('id') + ']');
            // sanity checks
            if (label.length == 0) {
                throw "No label for " + t.attr('id') + "!";
            }
            if (label.length > 1) {
                throw "Too many labels for " + t.attr('id') + "!";
            }

            text = label.text();
            if (options.hide_label) {
                label.hide();
            }
        }

        // set up the focus hook
        t.focus(function() {
            if (t.val() == text) {
                t.val('');
            }
            if (options.css_class) {
                t.removeClass(options.css_class);
            }
            return t; // made chainable
        });

        // set up the blur hook
        t.blur(function() {
            if (t.val() == '') {
                t.val(text);
                if (options.css_class && !t.hasClass(options.css_class)) {
                    t.addClass(options.css_class);
                }
            }
            return t;
        });

        // set up the change hook
        // when changing the field value programmatically, run .triggerHandler('change') to trigger this handler.
        t.change(function() {
            if (t.val() == '') {
                t.val(text);
            }
            if (options.css_class) {
                if (t.val() == text) {
                    t.addClass(options.css_class);
                } else {
                    t.removeClass(options.css_class);
                }
            }
            return t;
        });

        // bugfix from sendai, focus before bluring
        // bugfix from Lailson Bandeira, actually focusing and blur stuff below the fold
        //        scrolls the window, not good. Use triggerHandler instead of trigger.
        t.triggerHandler('change');
    };

    $.inline_label.version = 1.2;
    $.inline_label.defaults = {
        text: false,
        use_title: false,
        css_class: "inline_label",
        hide_label: true
    };

    $.fn.inline_label = function(options) {
        options = $.extend({}, $.inline_label.defaults, options || {});
        return this.each(function() {
            new $.inline_label(this, options);
        });
    };

})(jQuery);