如果项目选择器变量为true，则AngularJS添加css类

我有一个item selector指令，我想为所选项目添加一个测试：如果它已存档，我必须添加一个css类

.directive-items-selector{ ng_click: "openItemsSelector( $event )" }
  .wrapper
    %ui_select.ui-select{ ng: { model:  "input.model", disabled: "disabled",
                                change: "itemSelectModelChanged()" },
                        search_enabled: "{{ options.searchable }}" }

      %ui_select_match.ui-select-match{ items_selector_match: '',
                                        placeholder: "{{ input.placeholder }} ",
                                        allow_clear: "{{ options.clearable }}",
                                        title:       "{{ $select.selected.label }}" }
        %i.fa{ ng_class: 'icon' }

        {{ $select.selected.label }}
        {{$select.selected.object.is_archived}}

      %ui_select_choices.ui-select-choices{ repeat:  "item.id as item in input.filteredItems track by item.id",
                                            refresh: "reloadItems( $select.search )",
                                            refresh_delay: '{{ input.filterDelay }}' }
        .item{ ng_attr_title: "{{ ::item.label }}" }
          .item-label {{ ::item.label }}
          %small.item-details {{ ::item.details }}

    .items-selector-actions
      %a.pointer.action{ ng: { if: 'linkToModal', click: 'openDetails()', disabled: "!model"  }}
        {{ 'btn.details' | translate }}
        %a.pointer.action{ ng: { if: 'createButton && klassName && !disabled', click: 'createItem()' }}
          {{ 'btn.new' | translate }}

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{{$select.selected.object.is_archived}返回true如果项目已存档，我不知道如何添加此css类！任何帮助

您可以像这样使用ng class指令：

ng class=“{'class-false'：selected.object.is_存档，'class true'：}”