Component for vuetify, a select with input with input for others, you can configure which item opens the option of others. Thanks @jdonsan @nekosaur for the help.

VSelectOther.vue

<template>
  <v-container>
    <v-layout row>
      <v-flex xs12>
        <v-select
          :items="listitems"
          :label="labelSelect"
          :item-text="itemtext"
          :item-value="itemvalue"
          single-line
          v-model="selectother"
        ></v-select>
          <v-text-field v-show="selectother==otheritem"
          :label="labelInput"
          :rules="[requiredOther]"
          v-model="otherdata"
          ></v-text-field>
      </v-flex>
    </v-layout>                            
  </v-container>
</template>

<script>
export default {
  name: 'v-select-other',
  props: {
    listitems: {
      type: Array,
      required: true
    },
    labelSelect: {
      type: String,
      required: true
    },
    labelInput: {
      type: String,
      required: true
    },
    otheritem: {
      type: Number,
      required: true
    },
    itemtext: {
      type: String,
      required: true
    },
    itemvalue: {
      type: String,
      required: true
    }
  },
  data () {
    return {
      selectother: '',
      otherdata: ''
    }
  },
  methods: {
  },
  watch: {
    selectother: function () {
      if (this.selectother !== this.otheritem) {
        this.otherdata = ''
      }
    }
  },
  computed: {
    requiredOther () {
      if (this.selectother === this.otheritem) {
        return !!this.otherdata || 'Required.'
      }
      return true
    }
  }
}
</script>