<div v-for="n in this.counter" v-bind:key="n">
<v-row>
<!-- v-select for column -->
<v-col sm="3" lg="3" md="3" xl="3" class="pa-4">
<v-select :key="n" hide-details label="SelectColumn"></v-select>
</v-col>
<!-- v-select -->
<v-col sm="2" lg="2" md="2" xl="2" align-self="center">
<v-select
:key="n"
solo
:items="operators"
item-text="name"
item-value="id"
v-model="operators.id"
hide-details
label="Operator" >
<!-- select operators -->
<template slot="selection" slot-scope="data">
<v-flex xs2>
<v-icon>{{data.item.icon}}</v-icon>
</v-flex>
<v-flex class='ml-1'>
{{ data.item.name }}
</v-flex>
</template>
<!-- items -->
<template slot="item" slot-scope="data">
<v-list>
<v-icon>{{data.item.icon}}</v-icon>
</v-list>
<v-list>
<v-list v-html="data.item.name"></v-list>
</v-list>
</template>
</v-select>
</v-col>
<!-- input-field -->
<v-col sm="5" lg="5" xl="5" md="5" class="pa-4">
<v-text-field :key="n" hide-details label="InputField"></v-text-field>
</v-col>
<!-- btns -->
<v-col sm="1" md="1" lg="1" xl="1" align-self="center">
<v-btn
:key="n"
icon
color="blue"
:disabled="length(this.counter) === 1"
@click="this.counter--"
>
<v-icon size="35">mdi-minus</v-icon>
</v-btn>
</v-col>
<v-col lg="1" xl="1" mg="1" sm="1" align-self="center">
<v-btn
:key="n"
icon
color="blue"
@click="this.counter.concat([])"
>
<v-icon size="35">mdi-plus</v-icon>
</v-btn>
</v-col>
this.$set(this.counter, indexOfItem, newValue)