apps/workbench/app/assets/javascripts/infinite_scroll.js

   1 function maybe_load_more_content(event) {
   2     var scroller = this;        // element with scroll bars
   3     var $container;             // element that receives new content
   4     var src;                    // url for retrieving content
   5     var scrollHeight;
   6     var spinner, colspan;
   7     var serial = Date.now();
   8     var params;
   9     scrollHeight = scroller.scrollHeight || $('body')[0].scrollHeight;
  10     if ($(scroller).scrollTop() + $(scroller).height()
  11         >
  12         scrollHeight - 50)
  13     {
  14         $container = $(event.data.container);
  15         if (!$container.attr('data-infinite-content-href0')) {
  16             // Remember the first page source url, so we can refresh
  17             // from page 1 later.
  18             $container.attr('data-infinite-content-href0',
  19                             $container.attr('data-infinite-content-href'));
  20         }
  21         src = $container.attr('data-infinite-content-href');
  22         if (!src || !$container.is(':visible'))
  23             // Finished
  24             return;
  25
  26         // Don't start another request until this one finishes
  27         $container.attr('data-infinite-content-href', null);
  28         spinner = '<div class="spinner spinner-32px spinner-h-center"></div>';
  29         if ($container.is('table,tbody,thead,tfoot')) {
  30             // Hack to determine how many columns a new tr should have
  31             // in order to reach full width.
  32             colspan = $container.closest('table').
  33                 find('tr').eq(0).find('td,th').length;
  34             if (colspan == 0)
  35                 colspan = '*';
  36             spinner = ('<tr class="spinner"><td colspan="' + colspan + '">' +
  37                        spinner +
  38                        '</td></tr>');
  39         }
  40         $container.find(".spinner").detach();
  41         $container.append(spinner);
  42         $container.attr('data-infinite-serial', serial);
  43
  44         // Combine infiniteContentParams from multiple sources. This
  45         // mechanism allows each of several components to set and
  46         // update its own set of filters, without having to worry
  47         // about stomping on some other component's filters.
  48         //
  49         // For example, filterable.js writes filters in
  50         // infiniteContentParamsFilterable ("search for text foo")
  51         // without worrying about clobbering the filters set up by the
  52         // tab pane ("only show jobs and pipelines in this tab").
  53         params = {};
  54         $.each($container.data(), function(datakey, datavalue) {
  55             // Note: We attach these data to DOM elements using
  56             // <element data-foo-bar="baz">. We store/retrieve them
  57             // using $('element').data('foo-bar'), although
  58             // .data('fooBar') would also work. The "all data" hash
  59             // returned by $('element').data(), however, always has
  60             // keys like 'fooBar'. In other words, where we have a
  61             // choice, we stick with the 'foo-bar' style to be
  62             // consistent with HTML. Here, our only option is
  63             // 'fooBar'.
  64             if (/^infiniteContentParams/.exec(datakey)) {
  65                 if (datavalue instanceof Object) {
  66                     $.each(datavalue, function(hkey, hvalue) {
  67                         if (hvalue instanceof Array) {
  68                             params[hkey] = (params[hkey] || []).concat(hvalue);
  69                         } else if (hvalue instanceof Object) {
  70                             $.extend(params[hkey], hvalue);
  71                         } else {
  72                             params[hkey] = hvalue;
  73                         }
  74                     });
  75                 }
  76             }
  77         });
  78         $.each(params, function(k,v) {
  79             if (v instanceof Object) {
  80                 params[k] = JSON.stringify(v);
  81             }
  82         });
  83
  84         $.ajax(src,
  85                {dataType: 'json',
  86                 type: 'GET',
  87                 data: params,
  88                 context: {container: $container, src: src, serial: serial}}).
  89             fail(function(jqxhr, status, error) {
  90                 var $faildiv;
  91                 var $container = this.container;
  92                 if ($container.attr('data-infinite-serial') != this.serial) {
  93                     // A newer request is already in progress.
  94                     return;
  95                 }
  96                 if (jqxhr.readyState == 0 || jqxhr.status == 0) {
  97                     message = "Cancelled."
  98                 } else if (jqxhr.responseJSON && jqxhr.responseJSON.errors) {
  99                     message = jqxhr.responseJSON.errors.join("; ");
 100                 } else {
 101                     message = "Request failed.";
 102                 }
 103                 // TODO: report the message to the user.
 104                 console.log(message);
 105                 $faildiv = $('<div />').
 106                     attr('data-infinite-content-href', this.src).
 107                     addClass('infinite-retry').
 108                     append('<span class="fa fa-warning" /> Oops, request failed. <button class="btn btn-xs btn-primary">Retry</button>');
 109                 $container.find('div.spinner').replaceWith($faildiv);
 110             }).
 111             done(function(data, status, jqxhr) {
 112                 if ($container.attr('data-infinite-serial') != this.serial) {
 113                     // A newer request is already in progress.
 114                     return;
 115                 }
 116                 $container.find(".spinner").detach();
 117                 $container.append(data.content);
 118                 $container.attr('data-infinite-content-href', data.next_page_href);
 119             });
 120      }
 121 }
 122
 123 function ping_all_scrollers() {
 124     // Send a scroll event to all scroll listeners that might need
 125     // updating. Adding infinite-scroller class to the window element
 126     // doesn't work, so we add it explicitly here.
 127     $('.infinite-scroller').add(window).trigger('scroll');
 128 }
 129
 130 $(document).
 131     on('click', 'div.infinite-retry button', function() {
 132         var $retry_div = $(this).closest('.infinite-retry');
 133         var $container = $(this).closest('.infinite-scroller-ready')
 134         $container.attr('data-infinite-content-href',
 135                         $retry_div.attr('data-infinite-content-href'));
 136         $retry_div.
 137             replaceWith('<div class="spinner spinner-32px spinner-h-center" />');
 138         ping_all_scrollers();
 139     }).
 140     on('refresh-content', '[data-infinite-scroller]', function() {
 141         // Clear all rows, reset source href to initial state, and
 142         // (if the container is visible) start loading content.
 143         var first_page_href = $(this).attr('data-infinite-content-href0');
 144         if (!first_page_href)
 145             first_page_href = $(this).attr('data-infinite-content-href');
 146         $(this).
 147             html('').
 148             attr('data-infinite-content-href', first_page_href);
 149         ping_all_scrollers();
 150     }).
 151     on('ready ajax:complete', function() {
 152         $('[data-infinite-scroller]').each(function() {
 153             if ($(this).hasClass('infinite-scroller-ready'))
 154                 return;
 155             $(this).addClass('infinite-scroller-ready');
 156
 157             // $scroller is the DOM element that hears "scroll"
 158             // events: sometimes it's a div, sometimes it's
 159             // window. Here, "this" is the DOM element containing the
 160             // result rows. We pass it to maybe_load_more_content in
 161             // event.data.
 162             var $scroller = $($(this).attr('data-infinite-scroller'));
 163             if (!$scroller.hasClass('smart-scroll') &&
 164                 'scroll' != $scroller.css('overflow-y'))
 165                 $scroller = $(window);
 166             $scroller.
 167                 addClass('infinite-scroller').
 168                 on('scroll resize', { container: this }, maybe_load_more_content).
 169                 trigger('scroll');
 170         });
 171     });