数字过滤器最多可将数字过滤到两位小数，但不会以这种方式显示 [英] Number filter filters number down to two decimals, but does not display it that way

问题描述

这是我看到的:

该值设置为160.90，但显示为160.8999999999等.

The value is set at 160.90, but displays as 160.8999999999 etc.

<input class="form-control" ng-model="imprint.total" 
    value="{{imprint.total | number:2}}" readonly>

它经过对某些输入的过滤来获得总数，但从本质上讲，它只是价格乘以数量.

It goes through filtering of certain inputs to get that total, but essentially it's just a price multiplied to quantity.

推荐答案

在设置属性值时，ng-model指令将覆盖value属性中的值.您有一个只读文本框，也可以从其中删除ng-model.

The value in the value attribute will be overridden by ng-model directive when it sets the viewvalue as it renders. You have a readonly textbox you could just as well remove the ng-model from it.

<input class="form-control" 
       value="{{imprint.total | number:2}}" readonly>

使用ng-model并格式化实时数据输入，您将需要创建指令并使用解析器/格式化程序以格式化该值.

With ng-model and to format live data entry you would need to create a directive and use parsers/formatters to format the value.

angular.module('app', []).directive('format', ['numberFilter',
  function(numberFilter) {
    return {
      restrict: 'A',
      require: 'ngModel',
      link: function(scope, elm, attr, ngModel) {
        var decPlaces = attr.format || 2;

        function formatter(value) {

          if (value) {
            return numberFilter(value, decPlaces);
          }
        }

        ngModel.$formatters.push(formatter);

      }
    }
  }
]);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="app" ng-init="imprint=164.899999">
  <input class="form-control" value="{{imprint | number:2}}" readonly>

  <input class="form-control" ng-model="imprint" format="2" readonly>

</div>

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