Vue js - How to iterate an array inside an array?

Question

I need some dynamic select boxes when given a certain count. For that I have used two arrays -

(i)Array of index (count)
(ii)Array of values.

For first one I have used a v-model (as it need some dynamic input boxes) and second I have just used key and took out its value.

I have tried doing it with single iteration using second array but it failed regression testing.

new Vue({
  el: '#app',
  data: {
    count: 3,
    call: [1, 2, 3],
    sms: [4, 5, 6]
  }
})

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.min.js"></script>
<div id="app">
  <div class="field">
    <label class="label is-small">Total Count</label>
    <div class="control">
      <input type="text" v-model="count">
      <div class="field" v-for="k in Number(count)">
        <select class="input" v-model="call[k]">
          <option value="" selected>Select Call Hours</option>
          <option v-for="hour in 24">{{hour}}</option>
        </select>
        <select class="input" v-model="sms[k]">
          <option value="" selected>Select SMS Hours</option>
          <option v-for="hour in 24">{{hour}}</option>
        </select>
      </div>
    </div>
  </div>
</div>

This is a part of a form, it works correctly while newly adding data but while editing the values do not appear properly. The first index of call and sms array is left out each time.

Can you setup a codesandbox example with your data structure? — Trent
– Trent, Commented Aug 20, 2019 at 5:39
Vue's v-for with a Range iterates from [1, Range]. Try call[k - 1] and sms[k - 1] — Phil
– Phil, Commented Aug 20, 2019 at 5:44
Why dont you just use the index for keeping place. Like this: v-for="(hour, index) in 24" then you have the element and index in one array? — Michael
– Michael, Commented Aug 20, 2019 at 5:55

smzapp · Accepted Answer · 2019-08-20 06:14:50Z

Take note that array starts from 0. So, one way is to subtract k - 1. Example:

sms[k - 1]

new Vue({
  el: '#app',
  data: {
    count: 3,
    call: [1, 2, 3],
    sms: [4, 5, 6]
  }
})

<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.min.js"></script>
<div id="app">
  <div class="field">
    <label class="label is-small">Total Count</label>
    <div class="control">
      <input type="text" v-model="count">
      <div class="field" v-for="k in Number(count)">
        <select class="input" v-model="call[k - 1]">
          <option value="" selected>Select Call Hours</option>
          <option v-for="hour in 24">{{hour}}</option>
        </select>
        <select class="input" v-model="sms[k - 1]">
          <option value="" selected>Select SMS Hours</option>
          <option v-for="hour in 24">{{hour}}</option>
        </select>
      </div>
    </div>
  </div>
</div>

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