根据正在过滤的angularjs的值更改字体颜色

时间:2016-10-25 11:29:58

标签: javascript css angularjs angularjs-filter

虽然问题类似于change the font color based on value angular js但是如果我们在表达式中使用过滤器会怎么样:

HTML:

<span ng-class="{'time-elapsed': timestamp | timeElapsed != 'LIVE','time-elapsed-live': timestamp | timeElapsed == 'LIVE'}">{{timestamp | timeElapsed}}</span>

CSS:

.time-elapsed {
    color: black;
}
.time-elapsed-live {
    color: red;
}

JAVASCRIPT:

angular.module('appName', [])
.filter('timeElapsed', ['$filter', function($filter) {
    return function(input) {
      if(!input) {
        return "";
      }
      var currDate = new Date(Date.now());
      var inputDate = new Date(input);
      var diffDate = Math.abs(currDate.getTime()-inputDate.getTime());
      var diffHrs = Math.floor(diffDate/(1000 * 60 * 60));

      if(diffHrs < 1) {
        return "LIVE";
      }

      if(diffHrs < 24) {
        return diffHrs.toString() + "h";
      }

      var diffDays = Math.floor(diffHrs/24);

      if(diffDays<31)
        return diffDays.toString() + "d";

      var diffMonths=Math.floor(diffDays/31);

      if(diffMonths<12)
        return diffMonths.toString()+"mo";

      return Math.floor(diffMonths/12).toString()+"y";
    }
  }])

这段代码给了我错误,因为显然我们不能表达像&#34; timestamp |这样的表达式。 timeElapsed!=&#39; LIVE&#39;&#34;在ng-class里面。这样做的正确方法是什么?

1 个答案:

答案 0 :(得分:1)

您可以尝试调用函数,而不是直接调用过滤器。

像这样改变

<span ng-class="getTimeElapsedClass(timestamp)">{{timestamp | timeElapsed}}</span>

在控制器中注入过滤器,只需附加&#34;过滤器&#34;在您的过滤器名称

之后

有关详细信息,请参阅此link

你的控制器中的

像这样定义这个函数

$scope.getTimeElapsedClass = function(timestamp ){
  var filterResult = timeElapsedFilter(timestamp)
  if(filterResult !== 'Live'){
     return 'time-elapsed'
  } else{
      return 'time-elapsed-live'
   }
}