输入时禁用离子警报框按钮

Question

我有一个简单的警报框，其中包含2个输入字段。我想禁用按钮，直到它们在输入中成为值。当用户输入值时，出现按钮。谁能帮我解决这个问题吗？谢谢

  presentPrompt() {
  let alert = this.alertCtrl.create({
    title: 'Add Your Question',
    inputs: [
      {
        name: 'would',
        placeholder: 'Answer 1'

      },
      {
        name: 'rather',
        placeholder: 'Answer 2'
      }
    ],
    buttons: [
      {
        text: 'Add',
        role: 'add',
        handler: data => {
          this.wouldquestion = data.would;
          this.ratherquestion = data.rather;
          this.afd.list("Questions/").push({
            answer1:this.wouldquestion,
            answer2:this.ratherquestion,
            answer2click:this.answer2clicks,
            answer1click:this.answer1clicks
          });
        }
      },
          ]
  });
  alert.present();
}