在 AngularJS Material 中首次单击时显示自动完成下拉菜单

Show autocomplete dropdown at first click in AngularJS Material

我有一个来自 AngularJS Material 的 md-autocomplete 组件,它在第一次单击输入后没有显示带有选项的下拉列表,正如它应该显示的那样。当我完成搜索后单击输入然后删除输入的输入时,它会在下拉列表中显示完整的选项列表。谁能说出我的代码有什么问题? 这是我的代码:

我尝试了 md-min-legth 属性,但它不起作用。

<md-autocomplete ng-disabled="false"
                 md-no-cache="true"
                 name="projectAutocompleteFormRecord"
                 md-selected-item="model.TimeRecord.Project"
                 md-items="project in querySearchForProjectRecord(searchProjectTextRecord)"
                 md-item-text="project.Code + (project.DerivedCode ? project.DerivedCode : '') + '-' + project.Title"
                 md-search-text="searchProjectTextRecord"
                 md-min-length="0"
                 placeholder="Project">
 <md-item-template>
     <div class="item-title">
          <span md-highlight-text="searchProjectTextRecord"
               md-highlight-flags="ig">
               {{project.Code + (project.DerivedCode ? project.DerivedCode   : "") + "-" + project.Title}}
          </span>
      </div>
 </md-item-template>
</md-autocomplete>

<script>
// initialize of $scope.projs;
$scope.searchProjectTextRecord = "";
$scope.querySearchForProjectRecord = function (query) {
      var results = [];
      var projects = $scope.projs;
      if (projects) {
         results = query ? projects.filter(item => item.Code.toLowerCase().includes(query.toLowerCase()) ||item.Title.toLowerCase().includes(query.toLowerCase())) : projects;
      }
      return results;
}
</script>

我设法通过添加 <md-not-found> 元素来修复它。