Question

我想这样做：

ng-show="node.status | limitTo:1:1 == 1"

在一个简单的角度表达式中，它起作用：{{ node.status | limitTo:1:1 }} = 1

我无法在ngShow或ngIf语句中使用它....

Answer 1

limitTo 仅适用于 ng-repeat ，您不能使用 ng-if 或 ng-show

创建仅包含指定数量的新数组或字符串元素。元素取自开头或结尾源数组，字符串或数字，由值和指定限制的标志（正面或负面）。

或者你可以拥有一个实现逻辑的函数，并在 ng-if 或 ng-show
中调用它

Answer 2

您可以使用charAt从字符串中获取指定的字符，然后使用 ngIf / ngShow或ngSwitch：

var app = angular
.module("myApp", [])
.controller("myCtrl", function ($scope) {
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.1/angular.min.js"></script>
<body ng-app="myApp" ng-controller="myCtrl">

<div ng-repeat="node in [{status: '*C,1,0,19,064'}, {status: '*S,1,0,19,064'}] track by node.status">
  <div ng-if="node.status.charAt(1) === 'C'">This is status C</div>
  <div ng-if="node.status.charAt(1) === 'S'">This is status S</div>
</div>
<hr/>
<div ng-repeat="node in [{status: '*C,1,0,19,064'}, {status: '*S,1,0,19,064'}] track by node.status"
ng-switch="node.status.charAt(1)">
  <div ng-switch-when="C">This is status C</div>
  <div ng-switch-when="S">This is status S</div>
  <div ng-switch-default>This is default status</div>
</div>


</body>

AngularJs LimitTo在ngShow / ngIf语句中

2 个答案: