Merge pull request #1397 from edx/valera/add_visual_feedback_start_end_time_video

Add visual indicator to the interface for start/end times

CHANGELOG.rst

@@ -5,6 +5,10 @@ These are notable changes in edx-platform.  This is a rolling list of changes,
 in roughly chronological order, most recent first.  Add your entries at or near
 the top.  Include a label indicating the component affected.
 
+Blades: When start time and end time are specified for a video, a visual range
+will be shown on the time slider to highlight the place in the video that will
+be played.
+
 Studio: Bug fix for text loss in Course Updates when the text exists
 before the first tag.
 
@@ -367,10 +371,10 @@ Studio: Improve link re-writing on imports into a different course-id
 
 Studio: course catalog and course outline pages new use course id syntax w/ restful api style
 
-Common: 
+Common:
   separate the non-sql db connection configuration from the modulestore (xblock modeling) configuration.
   in split, separate the the db connection and atomic crud ops into a distinct module & class from modulestore
-  
+
 Common: location mapper: % encode periods and dollar signs when used as key in the mapping dict
 
 Common: location mapper: added a bunch of new helper functions for generating old location style info from a CourseLocator

cms/djangoapps/contentstore/features/transcripts.feature

@@ -78,7 +78,7 @@ Feature: Video Component Editor
         And I enter a "http://youtu.be/t__eq_exist" source to field number 1
         Then I see status message "not found"
         And I see button "import"
-        And I click button "import"
+        And I click transcript button "import"
         Then I see status message "found"
         And I see button "upload_new_timed_transcripts"
         And I see button "download_to_edit"
@@ -111,7 +111,7 @@ Feature: Video Component Editor
         And I enter a "http://youtu.be/t_neq_exist" source to field number 1
         And I see status message "replace"
         And I see button "replace"
-        And I click button "replace"
+        And I click transcript button "replace"
         And I see status message "found"
         And I see value "t_neq_exist" in the field "HTML5 Transcript"
 
@@ -153,7 +153,7 @@ Feature: Video Component Editor
         And I enter a "http://youtu.be/t__eq_exist" source to field number 1
         Then I see status message "not found"
         And I see button "import"
-        And I click button "import"
+        And I click transcript button "import"
         Then I see status message "found"
 
         And I enter a "t_not_exist.mp4" source to field number 2
@@ -205,7 +205,7 @@ Feature: Video Component Editor
         And I enter a "http://youtu.be/t__eq_exist" source to field number 1
         Then I see status message "not found"
         And I see button "import"
-        And I click button "import"
+        And I click transcript button "import"
         Then I see status message "found"
         And I see button "upload_new_timed_transcripts"
 
@@ -287,7 +287,7 @@ Feature: Video Component Editor
         And I enter a "http://youtu.be/t__eq_exist" source to field number 1
         Then I see status message "not found"
         And I see button "import"
-        And I click button "import"
+        And I click transcript button "import"
         Then I see status message "found"
         And I see button "upload_new_timed_transcripts"
 
@@ -309,7 +309,7 @@ Feature: Video Component Editor
         And I enter a "http://youtu.be/t__eq_exist" source to field number 1
         Then I see status message "not found"
         And I see button "import"
-        And I click button "import"
+        And I click transcript button "import"
         Then I see status message "found"
         And I see button "upload_new_timed_transcripts"
 
@@ -364,7 +364,7 @@ Feature: Video Component Editor
 
         And I see choose button "test_transcripts.mp4" number 1
         And I see choose button "t_not_exist.webm" number 2
-        And I click button "choose" number 2
+        And I click transcript button "choose" number 2
         And I see value "test_transcripts|t_not_exist" in the field "HTML5 Transcript"
 
     #21
@@ -384,13 +384,13 @@ Feature: Video Component Editor
         And I enter a "video_name_2.mp4" source to field number 1
         Then I see status message "use existing"
         And I see button "use_existing"
-        And I click button "use_existing"
+        And I click transcript button "use_existing"
         And I see value "video_name_2" in the field "HTML5 Transcript"
 
         And I enter a "video_name_3.mp4" source to field number 1
         Then I see status message "use existing"
         And I see button "use_existing"
-        And I click button "use_existing"
+        And I click transcript button "use_existing"
         And I see value "video_name_3" in the field "HTML5 Transcript"
 
     #22
@@ -410,7 +410,7 @@ Feature: Video Component Editor
         And I enter a "video_name_2.mp4" source to field number 1
         Then I see status message "use existing"
         And I see button "use_existing"
-        And I click button "use_existing"
+        And I click transcript button "use_existing"
         And I see value "video_name_2" in the field "HTML5 Transcript"
 
         And I enter a "video_name_3.mp4" source to field number 1
@@ -420,7 +420,7 @@ Feature: Video Component Editor
         And I enter a "video_name_4.mp4" source to field number 1
         Then I see status message "use existing"
         And I see button "use_existing"
-        And I click button "use_existing"
+        And I click transcript button "use_existing"
         And I see value "video_name_4" in the field "HTML5 Transcript"
 
     #23
@@ -443,7 +443,7 @@ Feature: Video Component Editor
         And I enter a "video_name_3.webm" source to field number 2
         Then I see status message "use existing"
         And I see button "use_existing"
-        And I click button "use_existing"
+        And I click transcript button "use_existing"
         And I see value "video_name_2|video_name_3" in the field "HTML5 Transcript"
 
     #24 Uploading subtitles with different file name than file

cms/djangoapps/contentstore/features/transcripts.py

@@ -38,7 +38,7 @@ SELECTORS = {
 }
 
 # button type , button css selector, button message
-BUTTONS = {
+TRANSCRIPTS_BUTTONS = {
     'import': ('.setting-import',  'Import from YouTube'),
     'download_to_edit': ('.setting-download', 'Download to Edit'),
     'disabled_download_to_edit': ('.setting-download.is-disabled', 'Download to Edit'),
@@ -127,9 +127,9 @@ def i_see_button(_step, not_see, button_type):
     button = button_type.strip()
 
     if not_see.strip():
-        assert world.is_css_not_present(BUTTONS[button][0])
+        assert world.is_css_not_present(TRANSCRIPTS_BUTTONS[button][0])
     else:
-        assert world.css_has_text(BUTTONS[button][0], BUTTONS[button][1])
+        assert world.css_has_text(TRANSCRIPTS_BUTTONS[button][0], TRANSCRIPTS_BUTTONS[button][1])
 
 
 @step('I (.*)see (.*)button "([^"]*)" number (\d+)$')
@@ -142,21 +142,21 @@ def i_see_button_with_custom_text(_step, not_see, button_type, custom_text, inde
     index = int(index.strip()) - 1
 
     if not_see.strip():
-        assert world.is_css_not_present(BUTTONS[button][0])
+        assert world.is_css_not_present(TRANSCRIPTS_BUTTONS[button][0])
     else:
-        assert world.css_has_text(BUTTONS[button][0], BUTTONS[button][1].format(custom_text), index)
+        assert world.css_has_text(TRANSCRIPTS_BUTTONS[button][0], TRANSCRIPTS_BUTTONS[button][1].format(custom_text), index)
 
 
-@step('I click button "([^"]*)"$')
-def click_button(_step, button_type):
+@step('I click transcript button "([^"]*)"$')
+def click_button_transcripts_variant(_step, button_type):
     world.wait(DELAY)
     world.wait_for_ajax_complete()
 
     button = button_type.strip()
-    world.css_click(BUTTONS[button][0])
+    world.css_click(TRANSCRIPTS_BUTTONS[button][0])
 
 
-@step('I click button "([^"]*)" number (\d+)$')
+@step('I click transcript button "([^"]*)" number (\d+)$')
 def click_button_index(_step, button_type, index):
     world.wait(DELAY)
     world.wait_for_ajax_complete()
@@ -164,7 +164,7 @@ def click_button_index(_step, button_type, index):
     button = button_type.strip()
     index = int(index.strip()) - 1
 
-    world.css_click(BUTTONS[button][0], index)
+    world.css_click(TRANSCRIPTS_BUTTONS[button][0], index)
 
 
 @step('I remove "([^"]+)" transcripts id from store')

cms/djangoapps/contentstore/features/video.feature

@@ -77,3 +77,20 @@ Feature: CMS.Video Component
     Then I focus on caption line with data-index 0
     Then I press "enter" button on caption line with data-index 0
     And I see caption line with data-index 0 has class "focused"
+
+  # 11
+  Scenario: When start end end times are specified, a range on slider is shown
+    Given I have created a Video component
+    And Make sure captions are closed
+    And I edit the component
+    And I open tab "Advanced"
+    And I set value "12" to the field "Start Time"
+    And I set value "24" to the field "End Time"
+    And I save changes
+    And I click video button "Play"
+
+    # The below line is a bit flaky. Numbers 73 and 73 were determined rather
+    # accidentally. They might change in the future as Video player gets CSS
+    # updates. If this test starts failing, 99.9% cause of failure is the line
+    # below.
+    Then I see a range on slider with styles "left" set to 73 px and "width" set to 73 px

cms/djangoapps/contentstore/features/video.py

@@ -5,11 +5,15 @@ from xmodule.modulestore import Location
 from contentstore.utils import get_modulestore
 from selenium.webdriver.common.keys import Keys
 
-BUTTONS = {
+VIDEO_BUTTONS = {
     'CC': '.hide-subtitles',
     'volume': '.volume',
+    'Play': '.video_control.play',
 }
 
+# We should wait 300 ms for event handler invocation + 200ms for safety.
+DELAY = 0.5
+
 
 @step('I have created a Video component$')
 def i_created_a_video_component(step):
@@ -131,7 +135,7 @@ def set_captions_visibility_state(_step, captions_state):
 
 @step('I hover over button "([^"]*)"$')
 def hover_over_button(_step, button):
-    world.css_find(BUTTONS[button.strip()]).mouse_over()
+    world.css_find(VIDEO_BUTTONS[button.strip()]).mouse_over()
 
 
 @step('Captions (?:are|become) "([^"]*)"$')
@@ -173,3 +177,24 @@ def caption_line_has_class(_step, index, className):
     SELECTOR = ".subtitles > li[data-index='{index}']".format(index=int(index.strip()))
     world.css_has_class(SELECTOR, className.strip())
 
+
+@step('I see a range on slider with styles "left" set to (.+) px and "width" set to (.+) px$')
+def see_a_range_slider_with_proper_range(_step, left, width):
+    left = int(left.strip())
+    width = int(width.strip())
+
+    world.wait_for_visible(".slider-range")
+    world.wait(4)
+    slider_range = world.browser.driver.find_element_by_css_selector(".slider-range")
+
+    assert int(round(float(slider_range.value_of_css_property("left")[:-2]))) == left
+    assert int(round(float(slider_range.value_of_css_property("width")[:-2]))) == width
+
+
+@step('I click video button "([^"]*)"$')
+def click_button_video(_step, button_type):
+    world.wait(DELAY)
+    world.wait_for_ajax_complete()
+    button = button_type.strip()
+    world.css_click(VIDEO_BUTTONS[button])
+

common/lib/xmodule/xmodule/css/video/display.scss

@@ -139,6 +139,24 @@ div.video {
           box-shadow: inset 0 1px 0 #999;
         }
 
+        div.ui-corner-all.slider-range {
+          background-color: #1e91d3;
+
+          /* We add opacity so that we can discern the amount of video that has
+           * been played. The progress will advance as a gray-shaded area. When
+           * it will overlap with the range, you will see a different shade of
+           * the range for part that has been played, and for part that is
+           * still to be played.
+           *
+           * For CSS opacity, different browsers are handled differently.
+           */
+          -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=30)";
+          filter: alpha(opacity=30);
+          -moz-opacity: 0.3;
+          -khtml-opacity: 0.3;
+          opacity: 0.3;
+        }
+
         a.ui-slider-handle {
           background: $pink url(../images/slider-handle.png) center center no-repeat;
           background-size: 50%;

common/lib/xmodule/xmodule/js/spec/video/general_spec.js

@@ -184,6 +184,62 @@
             });
         });
 
+        describe('checking start and end times', function () {
+            var miniTestSuite = [
+                {
+                    itDescription: 'both times are proper',
+                    data: {start: 12, end: 24},
+                    expectData: {start: 12, end: 24}
+                },
+                {
+                    itDescription: 'start time is invalid',
+                    data: {start: '', end: 24},
+                    expectData: {start: 0, end: 24}
+                },
+                {
+                    itDescription: 'end time is invalid',
+                    data: {start: 12, end: ''},
+                    expectData: {start: 12, end: null}
+                },
+                {
+                    itDescription: 'start time is less than 0',
+                    data: {start: -12, end: 24},
+                    expectData: {start: 0, end: 24}
+                },
+                {
+                    itDescription: 'start time is greater than end time',
+                    data: {start: 42, end: 24},
+                    expectData: {start: 42, end: null}
+                },
+            ];
+
+            beforeEach(function () {
+                loadFixtures('video.html');
+
+            });
+
+            $.each(miniTestSuite, function (index, test) {
+                itFabrique(test.itDescription, test.data, test.expectData);
+            });
+
+            return;
+
+            function itFabrique(itDescription, data, expectData) {
+                it(itDescription, function () {
+                    $('#example').find('.video')
+                        .data({
+                            'start': data.start,
+                            'end': data.end
+                        });
+
+                    state = new Video('#example');
+
+                    expect(state.config.start).toBe(expectData.start);
+                    expect(state.config.end).toBe(expectData.end);
+                });
+            }
+        });
+
         describe('multiple YT on page', function () {
             var state1, state2, state3;
 

common/lib/xmodule/xmodule/js/spec/video/video_player_spec.js

@@ -114,7 +114,9 @@
             showinfo: 0,
             enablejsapi: 1,
             modestbranding: 1,
-            html5: 1
+            html5: 1,
+            start: 0,
+            end: null
           },
           videoId: 'cogebirgzzM',
           events: {

common/lib/xmodule/xmodule/js/src/video/01_initialize.js

@@ -75,6 +75,8 @@ function (VideoPlayer) {
         state.parseYoutubeStreams = _.bind(parseYoutubeStreams, state);
         state.parseVideoSources   = _.bind(parseVideoSources, state);
         state.getVideoMetadata    = _.bind(getVideoMetadata, state);
+
+        state.checkStartEndTimes  = _.bind(checkStartEndTimes, state);
     }
 
     // function _renderElements(state)
@@ -277,6 +279,10 @@ function (VideoPlayer) {
             availableQualities: ['hd720', 'hd1080', 'highres']
         };
 
+        // Make sure that start end end times are valid. If not, they will be
+        // set to `null` and will not be used later on.
+        this.checkStartEndTimes();
+
         // Check if the YT test timeout has been set. If not, or it is in
         // improper format, then set to default value.
         tempYtTestTimeout = parseInt(data['ytTestTimeout'], 10);
@@ -360,6 +366,30 @@ function (VideoPlayer) {
         }
     }
 
+    /*
+     * function checkStartEndTimes()
+     *
+     * Validate config.start and config.end times.
+     *
+     * We can check at this time if the times are proper integers, and if they
+     * make general sense. I.e. if start time is => 0 and <= end time.
+     *
+     * An invalid start time will be reset to 0. An invalid end time will be
+     * set to `null`. It the task for the appropriate player API to figure out
+     * if start time and/or end time are greater than the length of the video.
+     */
+    function checkStartEndTimes() {
+        this.config.start = parseInt(this.config.start, 10);
+        if ((!isFinite(this.config.start)) || (this.config.start < 0)) {
+            this.config.start = 0;
+        }
+
+        this.config.end = parseInt(this.config.end, 10);
+        if ((!isFinite(this.config.end)) || (this.config.end < this.config.start)) {
+            this.config.end = null;
+        }
+    }
+
     // function parseYoutubeStreams(state, youtubeStreams)
     //
     //     Take a string in the form:

common/lib/xmodule/xmodule/js/src/video/02_html5_video.js

@@ -191,19 +191,8 @@ function () {
             }
 
             // Determine the starting and ending time for the video.
-            this.start = 0;
-            this.end = null;
-            if (config.playerVars) {
-                this.start = parseFloat(config.playerVars.start);
-                if ((!isFinite(this.start)) || (this.start < 0)) {
-                    this.start = 0;
-                }
-
-                this.end = parseFloat(config.playerVars.end);
-                if ((!isFinite(this.end)) || (this.end < this.start)) {
-                    this.end = null;
-                }
-            }
+            this.start = config.playerVars.start;
+            this.end = config.playerVars.end;
 
             // Create HTML markup for the <video> element, populating it with sources from previous step.
             // Because of problems with creating video element via jquery
@@ -217,7 +206,6 @@ function () {
             this.videoEl = $(this.video);
 
             this.playerState = HTML5Video.PlayerState.UNSTARTED;
-            // this.callStateChangeCallback();
 
             // Attach a 'click' event on the <video> element. It will cause the video to pause/play.
             this.videoEl.on('click', function (event) {

common/lib/xmodule/xmodule/js/src/video/03_video_player.js

@@ -34,9 +34,7 @@ function (HTML5Video, Resizer) {
         state.videoPlayer.onPause       = _.bind(onPause, state);
         state.videoPlayer.onPlay        = _.bind(onPlay, state);
 
-        state.videoPlayer.onUnstarted = _.bind(
-            onUnstarted, state
-        );
+        state.videoPlayer.onUnstarted   = _.bind(onUnstarted, state);
 
         state.videoPlayer.handlePlaybackQualityChange = _.bind(
             handlePlaybackQualityChange, state
@@ -86,13 +84,8 @@ function (HTML5Video, Resizer) {
             state.videoPlayer.playerVars.html5 = 1;
         }
 
-        if (state.config.start) {
-            state.videoPlayer.playerVars.start = state.config.start;
-            state.videoPlayer.playerVars.wmode = 'window';
-        }
-        if (state.config.end) {
-          state.videoPlayer.playerVars.end = state.config.end;
-        }
+        state.videoPlayer.playerVars.start = state.config.start;
+        state.videoPlayer.playerVars.end = state.config.end;
 
         // There is a bug which prevents YouTube API to correctly set the speed
         // to 1.0 from another speed in Firefox when in HTML5 mode. There is a
@@ -479,6 +472,13 @@ function (HTML5Video, Resizer) {
         );
 
         this.trigger(
+            'videoProgressSlider.updateStartEndTimeRegion',
+            {
+                duration: duration
+            }
+        );
+
+        this.trigger(
             'videoControl.updateVcrVidTime',
             {
                 time: time,

common/lib/xmodule/xmodule/js/src/video/06_video_progress_slider.js

@@ -28,21 +28,29 @@ function () {
 
     // function _makeFunctionsPublic(state)
     //
-    //     Functions which will be accessible via 'state' object. When called, these functions will
-    //     get the 'state' object as a context.
+    //     Functions which will be accessible via 'state' object. When called,
+    //     these functions will get the 'state' object as a context.
     function _makeFunctionsPublic(state) {
         state.videoProgressSlider.onSlide        = _.bind(onSlide, state);
         state.videoProgressSlider.onStop         = _.bind(onStop, state);
-        state.videoProgressSlider.updatePlayTime = _.bind(updatePlayTime, state);
+        state.videoProgressSlider.updatePlayTime = _.bind(
+            updatePlayTime, state
+        );
+
         //Added for tests -- JM
         state.videoProgressSlider.buildSlider = _.bind(buildSlider, state);
+
+        state.videoProgressSlider.updateStartEndTimeRegion = _.bind(
+            updateStartEndTimeRegion, state
+        );
     }
 
     // function _renderElements(state)
     //
-    //     Create any necessary DOM elements, attach them, and set their initial configuration. Also
-    //     make the created DOM elements available via the 'state' object. Much easier to work this
-    //     way - you don't have to do repeated jQuery element selects.
+    //     Create any necessary DOM elements, attach them, and set their
+    //     initial configuration. Also make the created DOM elements available
+    //     via the 'state' object. Much easier to work this way - you don't
+    // have to do repeated jQuery element selects.
     function _renderElements(state) {
         if (!onTouchBasedDevice()) {
             state.videoProgressSlider.el = state.videoControl.sliderEl;
@@ -53,8 +61,9 @@ function () {
     }
 
     function _buildHandle(state) {
-        state.videoProgressSlider.handle = state.videoProgressSlider.el.find('.ui-slider-handle');
-        
+        state.videoProgressSlider.handle = state.videoProgressSlider.el
+            .find('.ui-slider-handle');
+
         // ARIA
         // We just want the knob to be selectable with keyboard
         state.videoProgressSlider.el.attr('tabindex', -1);
@@ -64,28 +73,84 @@ function () {
             'role': 'slider',
             'title': 'video position',
             'aria-disabled': false,
-            'aria-valuetext': getTimeDescription(state.videoProgressSlider.slider.slider('option', 'value'))
+            'aria-valuetext': getTimeDescription(state.videoProgressSlider
+                .slider.slider('option', 'value'))
         });
     }
 
     // ***************************************************************
     // Public functions start here.
-    // These are available via the 'state' object. Their context ('this' keyword) is the 'state' object.
-    // The magic private function that makes them available and sets up their context is makeFunctionsPublic().
+    // These are available via the 'state' object. Their context ('this'
+    // keyword) is the 'state' object. The magic private function that makes
+    // them available and sets up their context is makeFunctionsPublic().
     // ***************************************************************
 
     function buildSlider(state) {
-        state.videoProgressSlider.slider = state.videoProgressSlider.el.slider({
-            range: 'min',
-            slide: state.videoProgressSlider.onSlide,
-            stop: state.videoProgressSlider.onStop
-        });
+        state.videoProgressSlider.slider = state.videoProgressSlider.el
+            .slider({
+                range: 'min',
+                slide: state.videoProgressSlider.onSlide,
+                stop: state.videoProgressSlider.onStop
+            });
+
+        state.videoProgressSlider.sliderProgress = state.videoProgressSlider
+            .slider
+            .find('.ui-slider-range.ui-widget-header.ui-slider-range-min');
+    }
+
+    function updateStartEndTimeRegion(params) {
+        var left, width, start, end;
+
+        // We must have a duration in order to determine the area of range.
+        // It also must be non-zero.
+        if (!params.duration) {
+            return;
+        }
+
+        // If the range spans the entire length of video, we don't do anything.
+        if (!this.config.start && !this.config.end) {
+            return;
+        }
+
+        start = this.config.start;
+
+        // If end is set to null, then we set it to the end of the video. We
+        // know that start is not a the beginning, therefore we must build a
+        // range.
+        end = this.config.end || params.duration;
+
+        left = (100 * (start / params.duration)).toFixed(1);
+        width = (100 * ((end - start) / params.duration)).toFixed(1);
+
+        if (!this.videoProgressSlider.sliderRange) {
+            this.videoProgressSlider.sliderRange = $('<div />', {
+                class: 'ui-slider-range ' +
+                       'ui-widget-header ' +
+                       'ui-corner-all ' +
+                       'slider-range'
+            }).css({
+                left: left + '%',
+                width: width + '%'
+            });
+
+            this.videoProgressSlider.sliderProgress
+                .after(this.videoProgressSlider.sliderRange);
+        } else {
+            this.videoProgressSlider.sliderRange
+                .css({
+                    left: left + '%',
+                    width: width + '%'
+                });
+        }
     }
 
     function onSlide(event, ui) {
         this.videoProgressSlider.frozen = true;
 
-        this.trigger('videoPlayer.onSlideSeek', {'type': 'onSlideSeek', 'time': ui.value});
+        this.trigger(
+            'videoPlayer.onSlideSeek',
+            {'type': 'onSlideSeek', 'time': ui.value}
+        );
 
         // ARIA
         this.videoProgressSlider.handle.attr(
@@ -98,7 +163,10 @@ function () {
 
         this.videoProgressSlider.frozen = true;
 
-        this.trigger('videoPlayer.onSlideSeek', {'type': 'onSlideSeek', 'time': ui.value});
+        this.trigger(
+            'videoPlayer.onSlideSeek',
+            {'type': 'onSlideSeek', 'time': ui.value}
+        );
 
         // ARIA
         this.videoProgressSlider.handle.attr(
@@ -110,23 +178,27 @@ function () {
         }, 200);
     }
 
-    //Changed for tests -- JM: Check if it is the cause of Chrome Bug Valera noticed
+    // Changed for tests -- JM: Check if it is the cause of Chrome Bug Valera
+    // noticed
     function updatePlayTime(params) {
-        if ((this.videoProgressSlider.slider) && (!this.videoProgressSlider.frozen)) {
-            /*this.videoProgressSlider.slider
+        if (
+            (this.videoProgressSlider.slider) &&
+            (!this.videoProgressSlider.frozen)
+        ) {
+            this.videoProgressSlider.slider
                 .slider('option', 'max', params.duration)
-                .slider('value', params.time);*/
-            this.videoProgressSlider.slider.slider('option', 'max', params.duration);
-            this.videoProgressSlider.slider.slider('option', 'value', params.time);
+                .slider('option', 'value', params.time);
         }
     }
 
-    // Returns a string describing the current time of video in hh:mm:ss format.
+    // Returns a string describing the current time of video in hh:mm:ss
+    // format.
     function getTimeDescription(time) {
         var seconds = Math.floor(time),
             minutes = Math.floor(seconds / 60),
             hours = Math.floor(minutes / 60),
             hrStr, minStr, secStr;
+
         seconds = seconds % 60;
         minutes = minutes % 60;
 
@@ -136,30 +208,36 @@ function () {
 
         if (hours) {
             hrStr += (hours < 2 ? ' hour ' : ' hours ');
-            if (minutes) {  
+
+            if (minutes) {
                 minStr += (minutes < 2 ? ' minute ' : ' minutes ');
             } else {
                 minStr += ' 0 minutes ';
             }
-            if (seconds) {   
+
+            if (seconds) {
                 secStr += (seconds < 2 ? ' second ' : ' seconds ');
             } else {
                 secStr += ' 0 seconds ';
-            }    
+            }
+
             return hrStr + minStr + secStr;
         } else if (minutes) {
             minStr += (minutes < 2 ? ' minute ' : ' minutes ');
-            if (seconds) {   
+
+            if (seconds) {
                 secStr += (seconds < 2 ? ' second ' : ' seconds ');
             } else {
                 secStr += ' 0 seconds ';
             }
+
             return minStr + secStr;
         } else if (seconds) {
             secStr += (seconds < 2 ? ' second ' : ' seconds ');
+
             return secStr;
         }
-        
+
         return '0 seconds';
     }