VueJS:如何设置输入的模型而不必将其放在输入上 [英] VueJS: How to set model of an input without having it to be on the input

问题描述

我希望输入在视图侧的元素上没有任何值，但在下面我希望它具有默认值，这里有一些片段来解释我的观点:

I want an input to have no value on it's element on the view side but underneath I want it to have a default value, here is some snippet to explain my point:

          <input
            class="form-control"
            v-model="amount"
            type="number"
            step=".01"
            min="0"
            required>
          </input>

我希望金额默认为 0 但不在输入上呈现 0，这在 vuejs 中可行吗?如果 input[type="number"] = ''，则该属性的值为 0 而不是 ' '.

I want amount to be 0 by default but not render 0 on the input, is this possible in vuejs? If the input[type="number"] = '', the value of the property is 0 and not ' '.

推荐答案

您可以将计算属性与 getter 和 setter 一起使用.如果值为零，getter 可以返回一个空字符串...

You can use a computed property with getter and setter. The getter can return an empty string if the value is zero...

new Vue({
  el: 'main',
  data: {
    amount: 0
  },
  computed: {
    formattedAmount: {
      get () {
        return this.amount || ''
      },
      set (value) {
        this.amount = parseFloat(value) || 0
      }
    }
  }
})

<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.min.js"></script>
<main>
  <input class="form-control" v-model="formattedAmount" type="number" step=".01" min="0" placeholder="Amount" required/>
  <pre>amount = {{ amount }}</pre>
</main>

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