How do I format currencies in a Vue component?

问题

My Vue component is like this :

<template>
    <div>
        <div class="panel-group"v-for="item in list">
            <div class="col-md-8">
                <small>
                   Total: <b>{{ item.total }}</b>
                </small>
            </div>
        </div>
    </div>
</template>

<script>
    export default {
        ...
        computed: {
            list: function() {
                return this.$store.state.transaction.list
            },
            ...
        }
    }
</script>

The result of {{ item.total }} is

26000000

But I want format it to be like this :

26.000.000,00

In jquery or javascript, I can do it

But, How to do it in vue component?

回答1:

UPDATE: I suggest using solution with filters, provided by @Jess.

I would write method for that, and then where you need to format price you can just put method in template and pass value down

methods: {
    formatPrice(value) {
        let val = (value/1).toFixed(2).replace('.', ',')
        return val.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ".")
    }
}

And then in template:

<template>
    <div>
        <div class="panel-group"v-for="item in list">
            <div class="col-md-8">
                <small>
                   Total: <b>{{ formatPrice(item.total) }}</b>
                </small>
            </div>
        </div>
    </div>
</template>

BTW - I didn't put too much care on replacing and regular expression.It could be improved.

回答2:

I have created a filter. The filter can be used in any page.

Vue.filter('toCurrency', function (value) {
    if (typeof value !== "number") {
        return value;
    }
    var formatter = new Intl.NumberFormat('en-US', {
        style: 'currency',
        currency: 'USD',
        minimumFractionDigits: 0
    });
    return formatter.format(value);
});

Then I can use this filter like this:

        <td class="text-right">
            {{ invoice.fees | toCurrency}}
        </td>

I used these related answers to help with the implementation of the filter:

• How can I format numbers as dollars currency string in JavaScript?
• Check whether variable is number or string in JavaScript

回答3:

With vuejs 2, you could use vue2-filters which does have other goodies as well.

npm install vue2-filters


import Vue from 'vue'
import Vue2Filters from 'vue2-filters'

Vue.use(Vue2Filters)

Then use it like so:

{{ amount | currency }} // 12345 => $12,345.00

Ref: https://www.npmjs.com/package/vue2-filters

回答4:

You can format currency writing your own code but it is just solution for the moment - when your app will grow you can need other currencies.

There is another issue with this:

1. For EN-us - dolar sign is always before currency - $2.00,
2. For selected PL you return sign after amount like 2,00 zł.

I think the best option is use complex solution for internationalization e.g. library vue-i18n( http://kazupon.github.io/vue-i18n/).

I use this plugin and I don't have to worry about such a things. Please look at documentation - it is really simple:

http://kazupon.github.io/vue-i18n/guide/number.html

so you just use:

<div id="app">
  <p>{{ $n(100, 'currency') }}</p>
</div>

and set EN-us to get $100.00:

<div id="app">
  <p>$100.00</p>
</div>

or set PL to get 100,00 zł:

<div id="app">
  <p>100,00 zł</p>
</div>

This plugin also provide different features like translations and date formatting.

回答5:

The comment by @RoyJ has a great suggestion. In the template you can just use built-in localized strings:

<small>
     Total: <b>{{ item.total.toLocaleString() }}</b>
</small>

It's not supported in some of the older browsers, but if you're targeting IE 11 and later, you should be fine.

回答6:

I used the custom filter solution proposed by @Jess but in my project we are using Vue together with TypeScript. This is how it looks like with TypeScript and class decorators:

import Component from 'vue-class-component';
import { Filter } from 'vue-class-decorator';

@Component
export default class Home extends Vue {

  @Filter('toCurrency')
  private toCurrency(value: number): string {
    if (isNaN(value)) {
        return '';
    }

    var formatter = new Intl.NumberFormat('en-US', {
        style: 'currency',
        currency: 'USD',
        minimumFractionDigits: 0
    });
    return formatter.format(value);
  }
}

In this example the filter can only be used inside the component. I haven't tried to implement it as a global filter, yet.

回答7:

There is issues with the precision of the accepted answer.

the round(value, decimals) function in this test works. unlike the simple toFixed example.

this is a test of the toFixed vs round method.

http://www.jacklmoore.com/notes/rounding-in-javascript/

  Number.prototype.format = function(n) {
      return this.toFixed(Math.max(0, ~~n));
  };
  function round(value, decimals) {
    return Number(Math.round(value+'e'+decimals)+'e-'+decimals);
  }

  // can anyone tell me why these are equivalent for  50.005, and 1050.005 through 8150.005 (increments of 50)

  var round_to = 2;
  var maxInt = 1500000;
  var equalRound = '<h1>BEGIN HERE</h1><div class="matches">';
  var increment = 50;
  var round_from = 0.005;
  var expected = 0.01;
  var lastWasMatch = true;

  for( var n = 0; n < maxInt; n=n+increment){
    var data = {};
    var numberCheck = parseFloat(n + round_from);
    data.original = numberCheck * 1;
    data.expected =  Number(n + expected) * 1;
    data.formatIt = Number(numberCheck).format(round_to) * 1;
    data.roundIt = round(numberCheck, round_to).toFixed(round_to) * 1;
    data.numberIt = Number(numberCheck).toFixed(round_to) * 1;
    //console.log(data);

    if( data.roundIt !== data.formatIt || data.formatIt !== data.numberIt ||
       data.roundIt !== data.numberIt || data.roundIt != data.expected
      ){
        if(lastWasMatch){
          equalRound = equalRound + '</div><div class="errors"> <hr/> Did Not Round UP <hr/>' ;
            document.write(' <h3>EXAMPLE: Did Not Round UP: ' + numberCheck + '</h3><br /><hr/> ');
            document.write('expected: '+data.expected + ' :: ' + (typeof data.expected)  + '<br />');
            document.write('format: '+data.formatIt + ' :: ' + (typeof data.formatIt)  + '<br />');
            document.write('round : '+data.roundIt + ' :: ' + (typeof data.roundIt)  + '<br />');
            document.write('number: '+data.numberIt + ' :: ' + (typeof data.numberIt)  + '<br />');
            lastWasMatch=false;
        }
        equalRound = equalRound + ', ' + numberCheck;
    } else {
        if(!lastWasMatch){
          equalRound = equalRound + '</div><div class="matches"> <hr/> All Rounded UP! <hr/>' ;
        } {
            lastWasMatch=true;
        }
        equalRound = equalRound + ', ' + numberCheck;
    }
  }
  document.write('equalRound: '+equalRound + '</div><br />');

mixin example

  export default {
    methods: {
      roundFormat: function (value, decimals) {
        return Number(Math.round(value+'e'+decimals)+'e-'+decimals).toFixed(decimals);
      },
      currencyFormat: function (value, decimals, symbol='$') {
        return symbol + this.roundFormat(value,2);
      }
    }
  }

来源：https://stackoverflow.com/questions/43208012/how-do-i-format-currencies-in-a-vue-component