Eine kurze Analyse responsiver Formulare in Angular

//初始化一个栏位的值为测试名字，并且不可用
const Name:FormControl = new FormControl({value:'测试名字', disabled: true });

//定义表单对象的属性为aliases的FormArray 
this.validateForm = this.fb.group({aliases: this.fb.array([]),});

//获取FormArray 
get aliases() {return this.validateForm.get('aliases') as FormArray;}

//给FormArray 添加item
this.aliases.push(
  this.fb.group({Id: 0,Name: [null],})
);

validateForm =  new FormGroup({Name: new FormControl({value:'测试名字', disabled: true }),});
validateForm = this.fb.group({});

validateForm!: FormGroup;
//手动创建
validateForm = new FormGroup({
    Name: new FormControl('测试名字'),
  });
  
//FormBuilder表单构建器
validateForm = this.fb.group({
  Name:[ { value:'测试名字',disabled:true}],
});

 //formControlName的值必须和ts代码中FormControl 的实例一致
 <input type="text" id="name" class="form-control" formControlName="name" required>
 
 //判断对应的FormControl 是否没通过校验 而有错误信息
 <div *ngIf="name.errors?.[&#39;required&#39;]">
    Name is required.
 </div>

<!-- formGroup 属性绑定表单对象 -->
<form nz-form [formGroup]="validateForm" nzLayout="vertical">
  <nz-form-label nzRequired>Employee ID
  </nz-form-label>
  
   <!-- Employee_ErrorTrip为验证不通过弹出的提示信息 -->
   <!-- formControlName绑定表单元素FormControl -->
  <nz-form-control [nzErrorTip]="Employee_ErrorTrip">
    <input nz-input formControlName="EmployeeID"  placeholder="" />
  </nz-form-control>

  <ng-template #Employee_ErrorTrip let-control>
    <ng-container *ngIf="control.hasError(&#39;required&#39;)">
      员工编号为必填项目
    </ng-container>
  </ng-template>
</form>

//定义表单对象
validateForm:FormGroup;

//构造函数注入FormBuilder
constructor(private fb: FormBuilder）{}

//在声明周期钩子函数中初始化表单
ngOnInit() {
  //初始化并且绑定必填验证器和长度验证器

    this.validateForm = this.fb.group({
      EmployeeID: ['', [Validators.required, Validators.maxLength(50)]],  
    })
}

<nz-table [nzData]="CONTRACTS" nzTableLayout="fixed" [nzShowQuickJumper]="true">
  <thead>
    <tr>
      <th>Contract type</th>
      <th>Contract start date</th>
      <th>Contract end date</th>
      <th>Agreement item</th>
      <th>Operation</th>
    </tr>
  </thead>

  <tbody>
    <!-- 绑定表单组属性aliases -->
    <ng-container formArrayName="aliases">
      <!-- 将表单组中当前行的索引与formGroup绑定 -->
      <tr [formGroupName]="i" *ngFor="let data of aliases.controls;index as i">
        <td>
          <nz-form-item>
            <nz-form-control nzSpan="1-24">
              <!-- AccountName绑定FormControl  -->
              <nz-select nzShowSearch nzAllowClear nzPlaceHolder="" formControlName="Type">
                <nz-option *ngFor="let option of Type" [nzValue]="option.Code" [nzLabel]="option.Value">
                </nz-option>
              </nz-select>
            </nz-form-control>
          </nz-form-item>
          <nz-form-item>
            <nz-form-control nzSpan="1-24" [nzErrorTip]="StartDate">
              <nz-date-picker id="StartDate" formControlName="StartDate" nzPlaceHolder="">
              </nz-date-picker>
              <!-- 校验提示模板用于时间验证器 -->
              <ng-template #StartDate let-control>
              	<!-- 判断时间验证器是否存在beginGtendDate属性，如果有说明没有通过验证 然后展示提示信息 -->
                <ng-container *ngIf="control.hasError(&#39;beginGtendDate&#39;)">
                  开始时间不能晚于结束时间
                </ng-container>
              </ng-template>
            </nz-form-control>
          </nz-form-item>
          <nz-form-item>
            <nz-form-control nzSpan="1-24" [nzErrorTip]="EndDate">
              <nz-date-picker style="width: 100%;" formControlName="EndDate" nzPlaceHolder="">
              </nz-date-picker>
              <ng-template #EndDate let-control>
                <ng-container *ngIf="control.hasError(&#39;beginGtendDate&#39;)">
                  开始时间不能晚于结束时间
                </ng-container>
              </ng-template>
            </nz-form-control>
          </nz-form-item>
          <nz-form-item>
            <nz-form-control nzSpan="1-24">
              <nz-select nzShowSearch nzAllowClear nzPlaceHolder="" formControlName="ContractType">
                <nz-option *ngFor="let option of ContractTypes" [nzValue]="option.Code" [nzLabel]="option.Value">
                </nz-option>
              </nz-select>
            </nz-form-control>
          </nz-form-item>
        </td>
        <td>
          <button style="color: #009688;" nz-button nzType="text">
            <i nz-icon nzType="save"></i>Save
          </button>
          <button nz-button nzType="text" nzDanger>
            <i nz-icon nzType="redo"></i>Revoke
          </button>
        </td>
      </tr>
    </ng-container>
  </tbody>
</nz-table>

//定义表单对象
validateForm:FormGroup;
//构造函数注入FormBuilder
constructor(private fb: FormBuilder）{}

//在声明周期钩子函数中初始化一个表单对象validateForm
ngOnInit() {
this.validateForm = this.fb.group({
      aliases: this.fb.array([]),
 	});
}
//声明aliases属性用作界面formArrayName绑定
get aliases(){
	return this.validateForm.get('aliases') as FormArray;
}

addNewRow() {
  const group = this.fb.group({
    //添加给Type初始化验证器
    Type: [null, [CommonValidators.required, this.contractTypeValidation()]],
    //初始化禁用StartDate和EndDate的FormControl 
    StartDate: [{ value: null, disabled: true }, []],
    EndDate: [{ value: null, disabled: true },[]],
    ContractType: [null, [CommonValidators.required, CommonValidators.maxLength(20)]],
  })
  this.aliases.push(group);
}

  //自定义Contract Type验证器
contractTypeValidation() {
    return (control: AbstractControl): ValidationErrors | null => {
      let contents: any[] = this.validateForm.value.aliases;
      if (control.touched && !control.pristine) {
        //获取表单组
        const formArray: any = this.validateForm.controls.aliases;
        //找到正在编辑的行的索引
        const index = contents.findIndex((x) => !x.isShowEdit);

        //获取开始结束时间FormControl 实例
        const StartDate: AbstractControl =
          formArray.controls[index].get('StartDate'),
          EndDate: AbstractControl = formArray.controls[index].get('EndDate');

        if (control.value === "短期合同") {
          //给开始结束时间设置验证器用于验证时间合法性
          StartDate.setValidators([CommonValidators.required, this.timeValidation()]);
          EndDate.setValidators([this.timeValidation()]);

          //启动开始结束时间控件
          EndDate.enable();
          StartDate.enable();
        } else {
          //Contract Type不是短期合同就清除验证器
          StartDate.clearValidators();
          EndDate.clearValidators();
          //禁用开始结束时间
          EndDate.disable();
          StartDate.disable();
        }

      }
      return null;
    }
  }



  //自定义时间验证器
 timeValidation()
  {
    return (control: AbstractControl): ValidationErrors | null => {
      if (!control.pristine) {
        let contents: any[] = this.validateForm.value.aliases;
        const formArray: any = this.validateForm.controls.aliases;
        const index = contents.findIndex((x) => !x.isShowEdit);
        //获取开始结束时间FormControl实例
        const EndDate: string = formArray.controls[index].get('EndDate').value;
        const StartDate: string =formArray.controls[index].get('StartDate').value;

        if (EndDate === null || StartDate === null) return null;

        //如果时间不合法，那就设置当前控件的错误状态 beginGtendDate为true
        if (
          Date.parse(control.value) > Date.parse(EndDate) ||
          Date.parse(control.value) < Date.parse(StartDate)
        ) {
          return { beginGtendDate: true };
        }
      }
      return null;
    }
  }