限制HTML5类型小数位数=＆QUOT;数＆QUOT;输入字段（Angularjs模型） [英] Restrict number of decimals in html5 type="number" input field (with Angularjs model)

问题描述

请找到小提琴
http://jsfiddle.net/q2SgJ/5/

<div ng-app="">
  <div ng-controller="Ctrl">

      WANTS:  {{val | number:2}} in "input" elelent<br>
    2 decimal in input:  <input  ng-model='val'> <br>
    2 decimal in input:  <input  type="number" step="0.01" ng-model='val'><br>
    2 decimal in input:  <input  ng-model='val' value="{{val |number:2}}"> <br>

  </div>
</div>

我如何限制小数点2位数的输入字段。正如例如 {{VAL |数量：2}} 工作，但不知道如何使用它来格式化连接到一个场NG-模式。我可以格式化数据/模型本身，但我有我喜欢把多余的十进制数的值，但只显示2位小数。

How can I restrict the decimal places to 2 digits in an INPUT field. As in the example {{val | number:2}} works, but not sure how to use it to format the ng-model attached to an field. I could have formatted the data/model itself, but I have few values I like to keep the extra decimal, but only display 2 decimal.

感谢。

推荐答案

您可以写一个指令来控制这个功能。这是不是附带棱角分明，但指令可以控制的事情怎么看和工作在页面上。

You can write a directive to control this functionality. It is not something that ships with angular, but directives can control how things look and work on the page.

我写了一个简单的： http://jsfiddle.net/q2SgJ/8/

这是做的伎俩链接功能：

This is the linking function that does the trick:

   link:function(scope,ele,attrs){
        ele.bind('keypress',function(e){
            var newVal=$(this).val()+(e.charCode!==0?String.fromCharCode(e.charCode):'');
            if($(this).val().search(/(.*)\.[0-9][0-9]/)===0 && newVal.length>$(this).val().length){
                e.preventDefault();
            }
        });
    }

这工作在限制输入到小数点后2位，但输入不格式化到小数点后两位。不管怎么说，这是一个起点。我相信你可以看一下其他的例子，写自己的指令来处理这个问题，你想要的方式。关于角的事情是，它不是一个答案每个问题的框架，而是一个框架，允许您创建比单独HTML5提供额外的功能，使得它非常简单。

This works at limiting the input to 2 decimal places, but doesn't format the input to two decimal places. Anyways, it is a starting point. I am sure you can look up other examples and write your own directive to handle this the way you want. The thing about Angular is that it is not a framework with an answer to every question, but a framework that allows you to create additional functionality than what HTML5 provides alone and makes it very simple.

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