在Angular 2材质滑块中处理美元 [英] Handling dollars in Angular 2 Material Slider

问题描述

我在Angular 2 Material应用程序中有一个表单，其中包括一个价格字段，该价格字段建模为具有最大值，最小值和步长的滑块:

I have a form in my Angular 2 Material application with, among other things, a price field modeled as a slider with a maximum, minimum, and step:

  <md-input type="range"
      [min]="minimumPrice"
      [max]="maximumPrice"
      [step]="priceTick"
      class="slider">

价格以美分(即没有分数)为模型，但是前端应以美元显示价格，例如，12345美分的价格现在，最大50000美分，最小0美分和5美分的步长是这样的:

Prices are modeled in cents (i.e. with no fractions), but the front-end should display prices in dollars, e.g., a price of 12345 cents with a maximum of 50000 cents, a minimum of 0 cents, and a step of 5 cents looks like this now:

                12345
       0 |---------*---------------| 50000

              in steps of 5

，但应以美元的形式显示:

                $123.45
   $0.00 |---------*---------------| $500.00

              in steps of $0.05

表单和滑块在显示美分时起作用，但是如何使滑块表现并正确显示以美元为单位的值?

The form and slider work when displayed cents, but how can I get the slider to behave and display correctly with values in dollars?

后端价格模型是long，它作为long值发送到前端(即，没有小数部分)，但是我愿意更改发送到前端的内容如果需要，可以简化处理.因此，通常的问题是:md-input正确显示美元并正确行事的最简单方法是什么?

The back-end price model is a long which is sent to the front-end as a long value (i.e., with no fractions) but I'm willing to change what I send to the front-end to simplify handling, if need be. So, the general question is: what's the simplest way to get md-input to display dollars correctly, and behave correctly?

推荐答案

在不完全熟悉Angular2 Material的情况下，我会冒险使用

Without being entirely familiar with Angular2 Material I would venture using the CurrencyPipe combined with a template variable for the slider if you're eschewing model binding:

<md-input type="range" name="slider"
  [min]="minimumPrice"
  [max]="maximumPrice"
  [step]="priceTick"
  #slider
  class="slider" [placeholder]="slider.value | customCurrency">
    <span md-prefix>{{slider.min | customCurrency}}</span>
    <span md-suffix>{{slider.max | customCurrency}}</span>
</md-input>

布局可能不正确，但这就是要点，您可以使用此Plunker进行修改

The layout is probably incorrect but that is the gist of it, and you can muck around with this Plunker http://plnkr.co/edit/Fj3hDJmwRD4SvzlKu6R6?p=preview

这是CurrencyPipe的非常简单的自定义扩展，用于删除/100并设置格式:

Here's a very simple custom extension of the CurrencyPipe to remove the /100 and set formatting:

custom-currency.pipe.ts

import {Pipe, PipeTransform} from '@angular/core';
import {CurrencyPipe} from '@angular/common';

@Pipe({
    name: "customCurrency"
})
export class CustomCurrencyPipe implements PipeTransform {

    constructor(private currencyPipe: CurrencyPipe) {}

    transform(value: any): string {
      return this.currencyPipe.transform(value / 100, 'USD', true);
    }
}

module.ts

import {CustomCurrencyPipe} from "[location]/custom-currency.pipe";
import {CurrencyPipe} from "@angular/common";

@NgModule({<...>, declarations: [<...>, CustomCurrencyPipe], providers: [<...>, CurrencyPipe]})

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