javascript - 使用 Angular 形式将元素值形成为 JSON

Question

我正在制作 Angular 6 应用程序，我正在使用 Angular dynamic form

在这里，我创建了一个嵌套的输入字段，其中在初始阶段将有两个输入文本框，单击“添加”按钮后，每次单击“添加”按钮时，接下来的两个输入框将被追加。

这里一切正常..

这里我使用了question-service.ts中的值，

  new TextboxQuestion({
  elementType: "textbox",
  class: "col-12 col-md-4 col-sm-12",
  key: "project_name",
  label: "Project Name",
  type: "text",
  value: '',
  required: true,
  order: 1
  }),

  new TextboxQuestion({
  elementType: "textbox",
  class: "col-12 col-md-4 col-sm-12",
  key: "project_desc",
  label: "Project Description",
  type: "text",
  value: '',
  required: true,
  order: 2
  }),
  new ArrayQuestion({
    key: 'myArray',
    value: '',
    order: 3,
    children: [
      new TextboxQuestion({
      elementType: "textbox",
      class: "col-12 col-md-4 col-sm-12",
      key: "property_one",
      label: "Property One",
      type: "text",
      value: '',
      required: true,
      order: 3
      }),
      new TextboxQuestion({
      elementType: "textbox",
      class: "col-12 col-md-4 col-sm-12",
      key: "property_two",
      label: "Property Two",
      type: "text",
      value: '' ,
      required: true,
      order: 4
      })
    ]
  })

我需要更改每个类似的数据应该来自 json，

  jsonData: any = [
    {
      "elementType": "textbox",
      "class": "col-12 col-md-4 col-sm-12",
      "key": "project_name",
      "label": "Project Name",
      "type": "text",
      "value": "",
      "required": true,
      "order": 1
    },
    {
      "elementType": "textbox",
      "class": "col-12 col-md-4 col-sm-12",
      "key": "project_desc",
      "label": "Project Description",
      "type": "text",
      "value": "",
      "required": true,
      "order": 2
    },
    {
      "elementType": "array",
      "key": "myArray",
      "value": "",
      "order": "3",
      "children": [
        {
          "elementType": "textbox",
          "class": "col-12 col-md-4 col-sm-12",
          "key": "property_one",
          "label": "Property One",
          "type": "text",
          "value": "",
          "required": true,
          "order": 3
        },
        {
          "elementType": "textbox",
          "class": "col-12 col-md-4 col-sm-12",
          "key": "property_two",
          "label": "Property Two",
          "type": "text",
          "value": "",
          "required": true,
          "order": 4
        }
      ]
    }
  ];

Stackblitz 没有 JSON:

https://stackblitz.com/edit/angular-x4a5b6-xcychx

Stackblitz 使用 JSON:

https://stackblitz.com/edit/angular-x4a5b6-u6ecpk

加载 JSON 时需要发生在没有 json 的 stacblitz 链接中发生的相同场景..

我在 getQuestions() 中给出了以下内容，例如，

 getQuestions() {

    console.log(this.jsonData);

    let questions: any = [];

    this.jsonData.forEach(element => {
      if (element.elementType === 'textbox') {
        questions.push(new TextboxQuestion(element));
      } else if (element.elementType === 'array') {
        questions.push(new ArrayQuestion(element));
      }
    });

    return questions.sort((a, b) => a.order - b.order);
  }
}

对于普通文本框，它可以工作，但对于子文本框，它在单击添加按钮时不起作用(文本框未显示)，子文本框不会被添加。

请帮助我实现 link 1 中发生的相同结果在link 2中使用JSON时也需要发生..并且请不要在核心 Angular 中包含任何第三方库。

Answer 1

@Many，当您有类型数组时，必须在推送数组之前创建子级。

...
} else if (element.elementType === 'array') {
    let children:any[]=[]; //declare children
    //each children of element fill our array children
    element.children.forEach(e=>{
       if (e.elementType === 'textbox') {
         children.push(new TextboxQuestion(e));
       }
    })
    //Hacemos un push not of element else element + the property children
    //changed (it will be the array created)
    questions.push(new ArrayQuestion({...element,children:children}));
}