/*	
 Watermark plugin for jQuery
 Version: 3.0.6
 http://jquery-watermark.googlecode.com/

 Copyright (c) 2009-2010 Todd Northrop
 http://www.speednet.biz/

 June 21, 2010

 Requires:  jQuery 1.2.3+

 Dual licensed under the MIT or GPL Version 2 licenses.
 See mit-license.txt and gpl2-license.txt in the project root for details.
 ------------------------------------------------------*/

(function ($) {

    var
    // Will speed up references to undefined
            undefined,

    // String constants for data names
            dataFlag = "watermark",
            dataClass = "watermarkClass",
            dataFocus = "watermarkFocus",
            dataFormSubmit = "watermarkSubmit",
            dataMaxLen = "watermarkMaxLength",
            dataPassword = "watermarkPassword",
            dataText = "watermarkText",

    // Includes only elements with watermark defined
            selWatermarkDefined = ":data(" + dataFlag + ")",

    // Includes only elements capable of having watermark
            selWatermarkAble = ":text,:password,:search,textarea",

    // triggerFns:
    // Array of function names to look for in the global namespace.
    // Any such functions found will be hijacked to trigger a call to
    // hideAll() any time they are called.  The default value is the
    // ASP.NET function that validates the controls on the page
    // prior to a postback.
    //
    // Am I missing other important trigger function(s) to look for?
    // Please leave me feedback:
    // http://code.google.com/p/jquery-watermark/issues/list
            triggerFns = [
                "Page_ClientValidate"
            ],

    // Holds a value of true if a watermark was displayed since the last
    // hideAll() was executed. Avoids repeatedly calling hideAll().
            pageDirty = false;

// Extends jQuery with a custom selector - ":data(...)"
// :data(<name>)  Includes elements that have a specific name defined in the jQuery data collection. (Only the existence of the name is checked; the value is ignored.)
// :data(<name>=<value>)  Includes elements that have a specific jQuery data name defined, with a specific value associated with it.
// :data(<name>!=<value>)  Includes elements that have a specific jQuery data name defined, with a value that is not equal to the value specified.
// :data(<name>^=<value>)  Includes elements that have a specific jQuery data name defined, with a value that starts with the value specified.
// :data(<name>$=<value>)  Includes elements that have a specific jQuery data name defined, with a value that ends with the value specified.
// :data(<name>*=<value>)  Includes elements that have a specific jQuery data name defined, with a value that contains the value specified.
    $.extend($.expr[":"], {
        "search":function (elem) {
            return "search" === (elem.type || "");
        },

        "data":function (element, index, matches, set) {
            var data, parts = /^((?:[^=!^$*]|[!^$*](?!=))+)(?:([!^$*]?=)(.*))?$/.exec(matches[3]);

            if (parts) {
                data = $(element).data(parts[1]);

                if (data !== undefined) {

                    if (parts[2]) {
                        data = "" + data;

                        switch (parts[2]) {
                            case "=":
                                return (data == parts[3]);
                            case "!=":
                                return (data != parts[3]);
                            case "^=":
                                return (data.slice(0, parts[3].length) == parts[3]);
                            case "$=":
                                return (data.slice(-parts[3].length) == parts[3]);
                            case "*=":
                                return (data.indexOf(parts[3]) !== -1);
                        }
                    }

                    return true;
                }
            }

            return false;
        }
    });

    $.watermark = {

        // Current version number of the plugin
        version:"3.0.6",

        // Default options used when watermarks are instantiated.
        // Can be changed to affect the default behavior for all
        // new or updated watermarks.
        // BREAKING CHANGE:  The $.watermark.className
        // property that was present prior to version 3.0.2 must
        // be changed to $.watermark.options.className
        options:{

            // Default class name for all watermarks
            className:"watermark",

            // If true, plugin will detect and use native browser support for
            // watermarks, if available. (e.g., WebKit's placeholder attribute.)
            useNative:true
        },

        // Hide one or more watermarks by specifying any selector type
        // i.e., DOM element, string selector, jQuery matched set, etc.
        hide:function (selector) {
            $(selector).filter(selWatermarkDefined).each(
                    function () {
                        $.watermark._hide($(this));
                    }
            );
        },

        // Internal use only.
        _hide:function ($input, focus) {
            var inputVal = $input.val() || "",
                    inputWm = $input.data(dataText) || "",
                    maxLen = $input.data(dataMaxLen) || 0,
                    className = $input.data(dataClass);

            if ((inputWm.length) && (inputVal == inputWm)) {
                $input.val("");

                // Password type?
                if ($input.data(dataPassword)) {

                    if (($input.attr("type") || "") === "text") {
                        var $pwd = $input.data(dataPassword) || [],
                                $wrap = $input.parent() || [];

                        if (($pwd.length) && ($wrap.length)) {
                            $wrap[0].removeChild($input[0]); // Can't use jQuery methods, because they destroy data
                            $wrap[0].appendChild($pwd[0]);
                            $input = $pwd;
                        }
                    }
                }

                if (maxLen) {
                    $input.attr("maxLength", maxLen);
                    $input.removeData(dataMaxLen);
                }

                if (focus) {
                    $input.attr("autocomplete", "off");  // Avoid NS_ERROR_XPC_JS_THREW_STRING error in Firefox

                    window.setTimeout(
                            function () {
                                $input.select();  // Fix missing cursor in IE
                            }
                            , 1);
                }
            }

            className && $input.removeClass(className);
        },

        // Display one or more watermarks by specifying any selector type
        // i.e., DOM element, string selector, jQuery matched set, etc.
        // If conditions are not right for displaying a watermark, ensures that watermark is not shown.
        show:function (selector) {
            $(selector).filter(selWatermarkDefined).each(
                    function () {
                        $.watermark._show($(this));
                    }
            );
        },

        // Internal use only.
        _show:function ($input) {
            var val = $input.val() || "",
                    text = $input.data(dataText) || "",
                    type = $input.attr("type") || "",
                    className = $input.data(dataClass);

            if (((val.length == 0) || (val == text)) && (!$input.data(dataFocus))) {
                pageDirty = true;

                // Password type?
                if ($input.data(dataPassword)) {

                    if (type === "password") {
                        var $pwd = $input.data(dataPassword) || [],
                                $wrap = $input.parent() || [];

                        if (($pwd.length) && ($wrap.length)) {
                            $wrap[0].removeChild($input[0]); // Can't use jQuery methods, because they destroy data
                            $wrap[0].appendChild($pwd[0]);
                            $input = $pwd;
                            $input.attr("maxLength", text.length);
                        }
                    }
                }

                // Ensure maxLength big enough to hold watermark (input of type="text" or type="search" only)
                if ((type === "text") || (type === "search")) {
                    var maxLen = $input.attr("maxLength") || 0;

                    if ((maxLen > 0) && (text.length > maxLen)) {
                        $input.data(dataMaxLen, maxLen);
                        $input.attr("maxLength", text.length);
                    }
                }

                className && $input.addClass(className);
                $input.val(text);
            }
            else {
                $.watermark._hide($input);
            }
        },

        // Hides all watermarks on the current page.
        hideAll:function () {
            if (pageDirty) {
                $.watermark.hide(selWatermarkAble);
                pageDirty = false;
            }
        },

        // Displays all watermarks on the current page.
        showAll:function () {
            $.watermark.show(selWatermarkAble);
        }
    };

    $.fn.watermark = function (text, options) {
        ///	<summary>
        ///		Set watermark text and class name on all input elements of type="text/password/search" and
        /// 	textareas within the matched set. If className is not specified in options, the default is
        /// 	"watermark". Within the matched set, only input elements with type="text/password/search"
        /// 	and textareas are affected; all other elements are ignored.
        ///	</summary>
        ///	<returns type="jQuery">
        ///		Returns the original jQuery matched set (not just the input and texarea elements).
        /// </returns>
        ///	<param name="text" type="String">
        ///		Text to display as a watermark when the input or textarea element has an empty value and does not
        /// 	have focus. The first time watermark() is called on an element, if this argument is empty (or not
        /// 	a String type), then the watermark will have the net effect of only changing the class name when
        /// 	the input or textarea element's value is empty and it does not have focus.
        ///	</param>
        ///	<param name="options" type="Object" optional="true">
        ///		Provides the ability to override the default watermark options ($.watermark.options). For backward
        /// 	compatibility, if a string value is supplied, it is used as the class name that overrides the class
        /// 	name in $.watermark.options.className. Properties include:
        /// 		className: When the watermark is visible, the element will be styled using this class name.
        /// 		useNative (Boolean or Function): Specifies if native browser support for watermarks will supersede
        /// 			plugin functionality. If useNative is a function, the return value from the function will
        /// 			determine if native support is used. The function is passed one argument -- a jQuery object
        /// 			containing the element being tested as the only element in its matched set -- and the DOM
        /// 			element being tested is the object on which the function is invoked (the value of "this").
        ///	</param>
        /// <remarks>
        ///		The effect of changing the text and class name on an input element is called a watermark because
        ///		typically light gray text is used to provide a hint as to what type of input is required. However,
        ///		the appearance of the watermark can be something completely different: simply change the CSS style
        ///		pertaining to the supplied class name.
        ///
        ///		The first time watermark() is called on an element, the watermark text and class name are initialized,
        ///		and the focus and blur events are hooked in order to control the display of the watermark.  Also, as
        /// 	of version 3.0, drag and drop events are hooked to guard against dropped text being appended to the
        /// 	watermark.  If native watermark support is provided by the browser, it is detected and used, unless
        /// 	the useNative option is set to false.
        ///
        ///		Subsequently, watermark() can be called again on an element in order to change the watermark text
        ///		and/or class name, and it can also be called without any arguments in order to refresh the display.
        ///
        ///		For example, after changing the value of the input or textarea element programmatically, watermark()
        /// 	should be called without any arguments to refresh the display, because the change event is only
        /// 	triggered by user actions, not by programmatic changes to an input or textarea element's value.
        ///
        /// 	The one exception to programmatic updates is for password input elements:  you are strongly cautioned
        /// 	against changing the value of a password input element programmatically (after the page loads).
        /// 	The reason is that some fairly hairy code is required behind the scenes to make the watermarks bypass
        /// 	IE security and switch back and forth between clear text (for watermarks) and obscured text (for
        /// 	passwords).  It is *possible* to make programmatic changes, but it must be done in a certain way, and
        /// 	overall it is not recommended.
        /// </remarks>

        if (!this.length) {
            return this;
        }

        var hasClass = false,
                hasText = (typeof(text) === "string");

        if (typeof(options) === "object") {
            hasClass = (typeof(options.className) === "string");
            options = $.extend({}, $.watermark.options, options);
        }
        else if (typeof(options) === "string") {
            hasClass = true;
            options = $.extend({}, $.watermark.options, {className:options});
        }
        else {
            options = $.watermark.options;
        }

        if (typeof(options.useNative) !== "function") {
            options.useNative = options.useNative ? function () {
                return true;
            } : function () {
                return false;
            };
        }

        return this.each(
                function () {
                    var $input = $(this);

                    if (!$input.is(selWatermarkAble)) {
                        return;
                    }

                    // Watermark already initialized?
                    if ($input.data(dataFlag)) {

                        // If re-defining text or class, first remove existing watermark, then make changes
                        if (hasText || hasClass) {
                            $.watermark._hide($input);

                            if (hasText) {
                                $input.data(dataText, text);
                            }

                            if (hasClass) {
                                $input.data(dataClass, options.className);
                            }
                        }
                    }
                    else {

                        // Detect and use native browser support, if enabled in options
                        if (options.useNative.call(this, $input)) {

                            // Placeholder attribute (WebKit)
                            // Big thanks to Opera for the wacky test required

                            if ((("" + $input.css("-webkit-appearance")).replace("undefined", "") !== "") && ((($input.attr("tagName") || "") !== "TEXTAREA")) && $input.size() > 0 && $input[0].tagName !== "TEXTAREA") {

                                // className is not set because WebKit doesn't appear to have
                                // a separate class name property for placeholders (watermarks).
                                if (hasText) {
                                    $input.attr("placeholder", text);
                                }

                                // Only set data flag for non-native watermarks (purposely commented-out)
                                // $input.data(dataFlag, 1);
                                return;
                            }
                        }

                        $input.data(dataText, hasText ? text : "");
                        $input.data(dataClass, options.className);
                        $input.data(dataFlag, 1); // Flag indicates watermark was initialized

                        // Special processing for password type
                        if (($input.attr("type") || "") === "password") {
                            var $wrap = $input.wrap("<span>").parent(),
                                    $wm = $($wrap.html().replace(/type=["']?password["']?/i, 'type="text"'));

                            $wm.data(dataText, $input.data(dataText));
                            $wm.data(dataClass, $input.data(dataClass));
                            $wm.data(dataFlag, 1);
                            $wm.attr("maxLength", text.length);

                            $wm.focus(
                                    function () {
                                        $.watermark._hide($wm, true);
                                    }
                            ).bind("dragenter",
                                    function () {
                                        $.watermark._hide($wm);
                                    }
                            ).bind("dragend",
                                    function () {
                                        window.setTimeout(function () {
                                            $wm.blur();
                                        }, 1);
                                    }
                            );
                            $input.blur(
                                    function () {
                                        $.watermark._show($input);
                                    }
                            ).bind("dragleave",
                                    function () {
                                        $.watermark._show($input);
                                    }
                            );

                            $wm.data(dataPassword, $input);
                            $input.data(dataPassword, $wm);
                        }
                        else {

                            $input.focus(
                                    function () {
                                        $input.data(dataFocus, 1);
                                        $.watermark._hide($input, true);
                                    }
                            ).blur(
                                    function () {
                                        $input.data(dataFocus, 0);
                                        $.watermark._show($input);
                                    }
                            ).bind("dragenter",
                                    function () {
                                        $.watermark._hide($input);
                                    }
                            ).bind("dragleave",
                                    function () {
                                        $.watermark._show($input);
                                    }
                            ).bind("dragend",
                                    function () {
                                        window.setTimeout(function () {
                                            $.watermark._show($input);
                                        }, 1);
                                    }
                            ).bind("drop",
                                    // Firefox makes this lovely function necessary because the dropped text
                                    // is merged with the watermark before the drop event is called.
                                    function (evt) {
                                        var dropText = evt.originalEvent.dataTransfer.getData("Text");

                                        if ($input.val().replace(dropText, "") === $input.data(dataText)) {
                                            $input.val(dropText);
                                        }

                                        $input.focus();
                                    }
                            );
                        }

                        // In order to reliably clear all watermarks before form submission,
                        // we need to replace the form's submit function with our own
                        // function.  Otherwise watermarks won't be cleared when the form
                        // is submitted programmatically.
                        if (this.form) {
                            var form = this.form,
                                    $form = $(form);

                            if (!$form.data(dataFormSubmit)) {
                                $form.submit($.watermark.hideAll);

                                // form.submit exists for all browsers except Google Chrome
                                // (see "else" below for explanation)
                                if (form.submit) {
                                    $form.data(dataFormSubmit, form.onsubmit || 1);

                                    form.onsubmit = (function (f, $f) {
                                        return function () {
                                            var nativeSubmit = $f.data(dataFormSubmit);
                                            $.watermark.hideAll();
                                            if (nativeSubmit instanceof Function) {
                                                nativeSubmit();
                                            } else {
                                                eval(nativeSubmit);
                                            }
                                        };
                                    })(form, $form);
                                } else {
                                    $form.data(dataFormSubmit, 1);

                                    // This strangeness is due to the fact that Google Chrome's
                                    // form.submit function is not visible to JavaScript (identifies
                                    // as "undefined").  I had to invent a solution here because hours
                                    // of Googling (ironically) for an answer did not turn up anything
                                    // useful.  Within my own form.submit function I delete the form's
                                    // submit function, and then call the non-existent function --
                                    // which, in the world of Google Chrome, still exists.
                                    form.submit = (function (f) {
                                        return function () {
                                            $.watermark.hideAll();
                                            delete f.submit;
                                            f.submit();
                                        };
                                    })(form);
                                }
                            }
                        }
                    }

                    $.watermark._show($input);
                }
        );
    };

// Hijack any functions found in the triggerFns list
    if (triggerFns.length) {

        // Wait until DOM is ready before searching
        $(function () {
            var i, name, fn;

            for (i = triggerFns.length - 1; i >= 0; i--) {
                name = triggerFns[i];
                fn = window[name];

                if (typeof(fn) === "function") {
                    window[name] = (function (origFn) {
                        return function () {
                            $.watermark.hideAll();
                            return origFn.apply(null, Array.prototype.slice.call(arguments));
                        };
                    })(fn);
                }
            }
        });
    }

})(jQuery);
