javascript - 根据结果​​的表行颜色

Question

我是 AngularJs 的新手，我正在获取格式为 json 的数据:

[
  {
    'StudentName':'abc',
    'maths':'0',
    'english':'0',
    'economics':'0',
  }
] 

我想计算每个学生的分数，如果分数低于 40%，则表格行应为红色，否则应为绿色。 我试过了。 HTML

<div ng-app="MyApp" ng-controller="con1"> 
  <table id="table1">
    <tr>
      <th>student Name</th>
      <th>History Marks</th>
      <th>Maths Marks</th>
      <th>Economics Marks</th>
      <th>Percentage</th>
    </tr>
    <tr ng-repeat="x in data" ng-if="{{co(per(x))}}" ng-class="pass">
      <td>{{x.StudentName}}</td>
      <td>{{x.maths}}</td>
      <td>{{x.economics}}</td>
      <td>{{x.english}}</td>
      <td>{{per(x)}}%</td>
    </tr>
  </table>

脚本

var app = angular.module('MyApp', []);
app.controller('con1', function ($scope, $http) {
    $http.get('/ajax/data').success(function (res) { $scope.data = res; });
    $scope.per = function (x) {
        avg = ((parseInt(x.maths) + parseInt(x.economics) + parseInt(x.english)) * 100) / 300;
        return avg;
    };
    $scope.co = function (x) { (x > 40) ? k = 1 : k = 0; return (k); }
});

CSS

.pass{background:green;}
.fail{background:red;} 

我正在获取百分比，但根据百分比我没有获取行颜色。

Answer 1

你需要ngClass

The ngClass directive allows you to dynamically set CSS classes on an HTML element by databinding an expression that represents all classes to be added.

代码

ng-class='{ "pass" : co(per(x)) == 1, "fail" : co(per(x)) == 0 }'

或，来自@RevanProdigalKnight 评论

ng-class="co(per(x)) ? 'pass' : 'fail'"

---

当使用 ngIf 调用函数时，您不需要字符串插值。

使用

ng-if="co(per(x))"

代替

ng-if="{{co(per(x))}}"