javascript - AngularJS - 过滤器空结果的占位符

Question

我想要一个占位符，例如<No result>当过滤结果返回空时。有人可以帮忙吗？我什至不知道从哪里开始...

HTML：

<div ng-controller="Ctrl">
<h1>My Foo</h1>
<ul>
    <li ng-repeat="foo in foos">
        <a href="#" ng-click="setBarFilter(foo.name)">{{foo.name}}</a>
    </li>
</ul>
<br />
<h1>My Bar</h1>
<ul>
    <li ng-repeat="bar in bars | filter:barFilter">{{bar.name}}</li>
</ul>

</div>

JS：

function Ctrl($scope) {

  $scope.foos = [{
    name: 'Foo 1'
  },{
    name: 'Foo 2'
  },{
    name: 'Foo 3'
  }];

  $scope.bars = [{
    name: 'Bar 1',
    foo: 'Foo 1'
  },{
    name: 'Bar 2',
    foo: 'Foo 2'
  }];

  $scope.setBarFilter = function(foo_name) {
    $scope.barFilter = {};
    $scope.barFilter.foo = foo_name;
  }
}

jsFiddle：http: //jsfiddle.net/adrn/PEumV/1/

谢谢！

Answer 1

只需要您指定一次过滤器的方法的调整：

  <li ng-repeat="bar in filteredBars = (bars | filter:barFilter)">{{bar.name}}</li>
</ul>
<p ng-hide="filteredBars.length">Nothing here!</p>

小提琴

Answer 2

这是使用 ng-show 的技巧

HTML：

<div ng-controller="Ctrl">
<h1>My Foo</h1>
<ul>
    <li ng-repeat="foo in foos">
        <a href="#" ng-click="setBarFilter(foo.name)">{{foo.name}}</a>
    </li>
</ul>
<br />
<h1>My Bar</h1>
<ul>
    <li ng-repeat="bar in bars | filter:barFilter">{{bar.name}}</li>
</ul>
<p ng-show="(bars | filter:barFilter).length == 0">Nothing here!</p>

</div>

jsFiddle：http: //jsfiddle.net/adrn/PEumV/2/

Answer 3

取自这份官方文件，他们是这样做的：

ng-repeat="friend in friends | filter:q as results"

然后将结果用作数组

<li class="animate-repeat" ng-if="results.length == 0">
  <strong>No results found...</strong>
</li>

完整片段：

<div ng-controller="repeatController">
I have {{friends.length}} friends. They are:
<input type="search" ng-model="q" placeholder="filter friends..." aria-label="filter friends" />


<ul class="example-animate-container">
    <li class="animate-repeat" ng-repeat="friend in friends | filter:q as results">
      [{{$index + 1}}] {{friend.name}} who is {{friend.age}} years old.
    </li>
    <li class="animate-repeat" ng-if="results.length == 0">
      <strong>No results found...</strong>
    </li>
  </ul>
</div>