//blade
<select class="form-control" id="series" v-model="selected" name="series">
                        <option>1</option>
                        <option>2</option>
                        <option>3</option>
                        <option>4</option>
                        <option>5</option>
                        <option>6</option>
                        <option>7</option>
                        <option>8</option>
                        <option>9</option>
                        <option>10</option>
                    </select>


<div class="form-group @if ($errors->has('repeat')) has-error @endif">
     <div class="input-group">
          <span class="input-group-addon">
             <label for="repeat" class="label label-primary">
                Powtórzenia
             </label>
		  </span>
          <input type="text" name="repeat" class="form-control" placeholder="Ilość powtórzeń" :value="repeats.repeat" >
      </div>
      @if ($errors->has('repeat')) <p class="help-block">{{ $errors->first('repeat') }}</p> @endif
</div>

//laravel app.js
const app = new Vue({
    el: '#app',
    data: {
        message: 'Hello Vue!',
        selected: '',
        options: [
            { text: '1', value: '1' },
            { text: '2', value: '2' },
            { text: '3', value: '3' },
            { text: '4', value: '4' },
            { text: '5', value: '5' },
            { text: '6', value: '6' },
            { text: '7', value: '7' },
            { text: '8', value: '8' },
            { text: '9', value: '9' },
            { text: '10', value: '10' }
        ],
        repeats: [],
        weights: [],
        times: []
    },
    methods:{
        onSubmit:function(){
            console.log('test');
        },
        addRow:function(){
            for(i = 0; i < this.selected; i++){
                this.repeats.push({repeat:''});
                this.weights.push({weight:''});
                this.times.push({time:''});
            }
        },
        deleteRow: function(index) {
            this.repeats.splice(index, 1);
            this.weights.splice(index, 1);
            this.times.splice(index, 1);
        }
    }
});