angular的form表单验证

注：基于日常工作的总结，只是基础用法，一般的情况下应该是够用了，本次总结是angular的响应式表单验证，不足之处欢迎指正！！！

1. 首先要在你的页面组件的ts文件中引入angular的表单模块

 import { FormBuilder, FormGroup, Validators } from '@angular/forms';

2. 在构造器里面

  constructor(
    private fb: FormBuilder
  ) { }

3. 定义表单验证 validateForm: FormGroup; // 表单验证

. 初始化表单

4. ts的代码

//在ngOnInit里面调用方法
  ngOnInit() {
  this.initFormGroup();
 }
  initFormGroup() {
    this.validateForm = this.fb.group({
      name: [null],//中文名称
      gender: [null],//性别
      eEthical: [null],//民族
      cardTypeName: [null, [Validators.required]],//证件类型名称
      remarks: [null],//备注
    }, { updateOn: 'blur' });
  }
  //有必填项和非必填项，必填项就添加Validators.required属性，并且在html里面添加
   <nz-form-label nzSpan="8" nzRequired>证件类型</nz-form-label>
   用的前端框架是ant-desing

5、html页面

<form nz-form [formGroup]="validateForm">
<nz-row [nzGutter]="24">
 <nz-col nzSpan="7">
        <nz-form-item class="mb-sm">
          <nz-form-label nzSpan="8">中文姓名</nz-form-label>
          <nz-form-control nzSpan="16">
            <input  nz-input formControlName="name" placeholder="请输入中文姓名" id="dpsrChnName" />
          </nz-form-control>
        </nz-form-item>
      </nz-col>
      <nz-col nzSpan="7">
        <nz-form-item class="mb-sm">
          <nz-form-label nzSpan="8" nzRequired>证件类型</nz-form-label>
          <nz-form-control nzSpan="16">
            <nz-select  formControlName="cardTypeName" id="cardTypeName"
              [nzAllowClear]="false" nzPlaceHolder="请选择证件类型">
              <nz-option *ngFor="let option of cardData" [nzLabel]="option.name" [nzValue]="option.code">
              </nz-option>
            </nz-select>
            <!--  必填项校验提示 -->
            <nz-form-explain
              *ngIf="validateForm.get('cardTypeName').dirty && validateForm.get('cardTypeName').errors">
              证件类型不能为空
            </nz-form-explain>
          </nz-form-control>
        </nz-form-item>
      </nz-col>
         <nz-col>
            <button nz-button nzType="primary" (click)="add()">保存</button>
            <button nz-button nzType="default" (click)="cancelAdd()">取消</button>
      </nz-col>
      </nz-row >
      
</form>

6、对数据进行保存

add(){
    const param = this.validateForm.value;
    for (const i in this.validateForm.controls) {
      if (this.validateForm.controls.hasOwnProperty(i)) {
        this.validateForm.controls[i].markAsDirty();
        this.validateForm.controls[i].updateValueAndValidity();
      }
    }
    if (!this.validateForm.valid) {
      return;
    }
    this.http.post(http.add, param ).subscribe((result: any) => {
      if (result.code=== 200) {
        this.message.success('添加成功', { nzDuration: 1000 })
        //表单清空
        this.validateForm.reset();
      }
    });
}

7、验证通过没有问题调保存的接口传参param即可，未通过验证前端页面会有提示