title: How to implement dropdown select box using alert prompt in ionic2 & typescript?
body: <p>The code example for alertprompt is mentioned below:</p>
  
  <hr>
  
  <pre><code>let prompt = this.alertCtrl.create({
              title: 'Bid on this delivery',
              inputs: [
                  {
                      name: 'amount',
                      placeholder: '£ 0.0'
                  },
              ],
              select: [
                  {
                      ???????????
                  },
              ],
              select: [
                  {
                      name: 'expiry',
                      options: {
                          option: 'Nerver',
                          option: '24 hours'
                      },
                      placeholder: ''
                  },
              ],
              buttons: [
                  {
                      text: 'Cancel',
                      handler: data =&gt; {
                          console.log('Cancel clicked');
                      }
                  },
                  {
                      text: 'Save',
                      handler: data =&gt; {
                          console.log('Saved clicked');
                      }
                  }
              ]
          });
          prompt.present();
  
      }
  </code></pre>
  
  <hr>
  
  <p>For input the typescript code is: </p>
  
  <pre><code>[
      {
          name: 'amount',
          placeholder: '£ 0.0'
      }
  ]
  </code></pre>
  
  <p>How to implement dropdown select box?</p>
  
  <pre><code>     select: [
          ??????????????????????????
       ]
  </code></pre>