rvalenciano/ngx-cron-jobs

<style>
  .cron-select-wrap {
    display: inline-block;
  }

  .cron-select-wrap .cron-select {
    width: 150px;
    height: 34px;
    padding: 6px 12px;
    margin: 0;
    font-size: 14px;
    line-height: 1.42857143;
    color: #555;
    background-color: #fff;
    background-image: none;
    border: 1px solid #ccc;
    border-radius: 4px;
    -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
    box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075);
    -webkit-transition: border-color ease-in-out 0.15s, -webkit-box-shadow ease-in-out 0.15s;
    -o-transition: border-color ease-in-out 0.15s, box-shadow ease-in-out 0.15s;
    transition: border-color ease-in-out 0.15s, box-shadow ease-in-out 0.15s;
  }

  .cron-select-wrap select[multiple] {
    height: 140px;
  }

  .select-options {
    display: inline-block;
  }
</style>
<div class="cron-wrap">
  <span>Every: </span>
  <div class="cron-select-wrap">
    <select class="cron-select" [(ngModel)]="selectedBase">
            <option *ngFor="let item of initialFrequencies" [ngValue]="item.value">{{item.label}}</option>
        </select>
  </div>

  <div class="select-options">

    <span *ngIf="selectedBase == 4">on </span>
    <div *ngIf="selectedBase == 4" class="cron-select-wrap">
      <select [multiple]="cronJobConfig.multiple" class="cron-select day-value" [(ngModel)]="selectedDay">
      <option *ngFor="let item of cronDayValues" [ngValue]="item.value">{{item.label}}</option>
      </select>
    </div>
    <span *ngIf="selectedBase >= 5">on the </span>
    <div *ngIf="selectedBase >= 5" class="cron-select-wrap">

      <select [multiple]="cronJobConfig.multiple" class="cron-select day-of-month-value" [(ngModel)]="selectedDayOfMonth">
        <option *ngFor="let item of cronNumeral" [ngValue]="item.value">{{item.label}}</option>
      </select>
    </div>


    <span *ngIf="selectedBase == 6">of </span>
    <div *ngIf="frequency.base == 6" class="cron-select-wrap">
      <select [multiple]="cronJobConfig.multiple" class="cron-select month-value" [(ngModel)]="selectedMonth">
        <option *ngFor="let item of cronMonthName" [ngValue]="item.value">{{item.label}}</option>
      </select>
    </div>

    <span *ngIf="selectedBase >= 2">at </span>
    <div *ngIf="selectedBase >= 3" class="cron-select-wrap">
      <select [multiple]="cronJobConfig.multiple" class="cron-select hour-value" [(ngModel)]="selectedHour">

        <option *ngFor="let item of hourValues" [ngValue]="item">{{item}}</option>
      </select>
    </div>
    <span *ngIf="selectedBase >= 3"> : </span>
    <div *ngIf="frequency.base >= 2" class="cron-select-wrap">

      <select [multiple]="cronJobConfig.multiple" class="cron-select minute-value" [(ngModel)]="selectedMinutes">
        <option *ngFor="let item of minuteValues" [ngValue]="item">{{item}}</option>
        </select>
    </div>
    <span *ngIf="selectedBase == 2"> past the hour</span>

  </div>
</div>