Hide welcome paragraph, unless viewed by first-time visitor (JS cooki…

…e). Bug 611382.

media/css/input.css

@@ -302,6 +302,10 @@ header, footer, article, section { display: block; }
     display: none;
 }
 
+#dashboard #welcome {
+    display: none;
+}
+
 .messages {
     }
     .message {

media/js/dashboard.js

@@ -1,6 +1,7 @@
 var feedback_chart; // Highcharts wants this to be global.
 
 (function($) {
+    /** Highcharts */
     $(document).ready(function() {
         var chart_id = 'feedback-chart',
             chart_div = $('#'+chart_id);
@@ -61,4 +62,12 @@ var feedback_chart; // Highcharts wants this to be global.
         feedback_chart.destroy();
         feedback_chart = new Highcharts.Chart(options);
     });
+
+    /** Show "welcome" block on first visit */
+    $(document).ready(function() {
+        if (!$.cookie('intro_seen')) {
+            $('#welcome').show();
+            $.cookie('intro_seen', true, {path: '/'});
+        }
+    });
 })(jQuery);

media/js/jquery.cookie.js

@@ -0,0 +1,96 @@
+/**
+ * Cookie plugin
+ *
+ * Copyright (c) 2006 Klaus Hartl (stilbuero.de)
+ * Dual licensed under the MIT and GPL licenses:
+ * http://www.opensource.org/licenses/mit-license.php
+ * http://www.gnu.org/licenses/gpl.html
+ *
+ */
+
+/**
+ * Create a cookie with the given name and value and other optional parameters.
+ *
+ * @example $.cookie('the_cookie', 'the_value');
+ * @desc Set the value of a cookie.
+ * @example $.cookie('the_cookie', 'the_value', { expires: 7, path: '/', domain: 'jquery.com', secure: true });
+ * @desc Create a cookie with all available options.
+ * @example $.cookie('the_cookie', 'the_value');
+ * @desc Create a session cookie.
+ * @example $.cookie('the_cookie', null);
+ * @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain
+ *       used when the cookie was set.
+ *
+ * @param String name The name of the cookie.
+ * @param String value The value of the cookie.
+ * @param Object options An object literal containing key/value pairs to provide optional cookie attributes.
+ * @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object.
+ *                             If a negative value is specified (e.g. a date in the past), the cookie will be deleted.
+ *                             If set to null or omitted, the cookie will be a session cookie and will not be retained
+ *                             when the the browser exits.
+ * @option String path The value of the path atribute of the cookie (default: path of page that created the cookie).
+ * @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie).
+ * @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will
+ *                        require a secure protocol (like HTTPS).
+ * @type undefined
+ *
+ * @name $.cookie
+ * @cat Plugins/Cookie
+ * @author Klaus Hartl/klaus.hartl@stilbuero.de
+ */
+
+/**
+ * Get the value of a cookie with the given name.
+ *
+ * @example $.cookie('the_cookie');
+ * @desc Get the value of a cookie.
+ *
+ * @param String name The name of the cookie.
+ * @return The value of the cookie.
+ * @type String
+ *
+ * @name $.cookie
+ * @cat Plugins/Cookie
+ * @author Klaus Hartl/klaus.hartl@stilbuero.de
+ */
+jQuery.cookie = function(name, value, options) {
+    if (typeof value != 'undefined') { // name and value given, set cookie
+        options = options || {};
+        if (value === null) {
+            value = '';
+            options.expires = -1;
+        }
+        var expires = '';
+        if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
+            var date;
+            if (typeof options.expires == 'number') {
+                date = new Date();
+                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
+            } else {
+                date = options.expires;
+            }
+            expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
+        }
+        // CAUTION: Needed to parenthesize options.path and options.domain
+        // in the following expressions, otherwise they evaluate to undefined
+        // in the packed version for some reason...
+        var path = options.path ? '; path=' + (options.path) : '';
+        var domain = options.domain ? '; domain=' + (options.domain) : '';
+        var secure = options.secure ? '; secure' : '';
+        document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
+    } else { // only name given, get cookie
+        var cookieValue = null;
+        if (document.cookie && document.cookie != '') {
+            var cookies = document.cookie.split(';');
+            for (var i = 0; i < cookies.length; i++) {
+                var cookie = jQuery.trim(cookies[i]);
+                // Does this cookie string begin with the name we want?
+                if (cookie.substring(0, name.length + 1) == (name + '=')) {
+                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
+                    break;
+                }
+            }
+        }
+        return cookieValue;
+    }
+};

settings.py

@@ -186,6 +186,7 @@ def __new__(self):
         'common': (
             'js/jquery.min.js',
             'js/jquery-ui.min.js',
+            'js/jquery.cookie.js',
             'js/init.js',
             'js/input.js',
             'js/search.js',

templates/includes/footer.html

@@ -7,7 +7,8 @@
       <p id="footer-links">
         <a href="http://www.mozilla.com/en-US/privacy-policy.html">{{ _('Privacy Policy') }}</a> &nbsp;|&nbsp;
         <a href="http://www.mozilla.com/en-US/about/legal.html">{{ _('Legal Notices') }}</a> &nbsp;|&nbsp;
-        <a href="http://www.mozilla.com/en-US/legal/fraud-report/index.html">{{ _('Report Trademark Abuse') }}</a>
+        <a href="http://www.mozilla.com/en-US/legal/fraud-report/index.html">{{ _('Report Trademark Abuse') }}</a> &nbsp;|&nbsp;
+        <a href="{{ url('about') }}">{{ _('About Firefox Input') }}</a>
       </p>
       <p>
         {% trans legal_url='http://www.mozilla.com/en-US/about/legal.html#site',