Angular ui-select 占位符在初始化 ng-model 时不起作用

Angular ui-select placeholder not working when ng-model is initialized

我试图在每次单击按钮时添加一个新的 select,

html:

 <div ng-repeat = "select in selects track by $index">
  <ui-select ng-model="selects[$index]" theme="select2" ng-disabled="disabled" style="min-width: 300px;">
    <ui-select-match placeholder="Select a person in the list or search his name/age...">{{$select.selected.name}}</ui-select-match>
    <ui-select-choices repeat="person in people">
      <div ng-bind-html="person.name | highlight: $select.search"></div>
    </ui-select-choices>
  </ui-select>
 </div>
 <button ng-click="addNewSelect()"> Add new select</button>

控制器:

  $scope.selects = [{}];
  $scope.addNewSelect = function() {
    $scope.selects.push({});
  }

对象数组保存在数组 'selects' 中,但占位符没有出现在 select 中,因为我最初使用空对象初始化 ng-model。在这种情况下如何让占位符起作用?

这是相同的Plunker

您在 selects[$index] 之后缺少 .selected

没有这个,ui-select 认为您 select 编辑了一个空对象(selects[$index])并且不会显示占位符。

<ui-select ng-model="selects[$index].selected" theme="select2" ng-disabled="disabled" style="min-width: 300px;">

http://plnkr.co/edit/56SHyE01BJ4EXglLlIcb?p=preview

你也不需要使用索引查找,你可以使用select.selected

<ui-select ng-model="select.selected" theme="select2" ng-disabled="disabled" style="min-width: 300px;">

http://plnkr.co/edit/3Uq8lDtDOaj5mIZVrCfv?p=preview

最快的方法是添加 css display:block 占位符项。

.select2-chosen{
   display: block !important;
}

上述解决方案在某些情况下效果很好,但在某些情况下效果不佳。

<ui-select ng-model="selectedChannel"
           on-select="$ctrl.channelSelected(selectedChannel)">
    <ui-select-match placeholder="Select Channel Type">
        {{selectedChannel.text}}
    </ui-select-match>
    <ui-select-choices ui-select-header-group-selectable="$ctrl.selectGroupHeader"
                       group-by="groupFindChannel"
                       repeat="channel in (r.channels | filter: $select.search) track by channel.id">
        <div ng-bind-html="channel.text | highlight: $select.search"></div>
    </ui-select-choices>
</ui-select>

^ 在这里让占位符显示...只需

$scope.selectedChannel = null;

希望对您有所帮助...