简单表单校验
傻瓜式校验
直接复制Antd中demo
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | < form nz-form [nzLayout]="'inline'" [formGroup]="validateForm" (ngSubmit)="submitForm()"> < nz-form-item > < nz-form-control nzErrorTip = "Please input your username!" > < nz-input-group nzPrefixIcon = "user" > < input formControlName = "userName" nz-input placeholder = "Username" /> </ nz-input-group > </ nz-form-control > </ nz-form-item > < nz-form-item > < nz-form-control nzErrorTip = "Please input your Password!" > < nz-input-group nzPrefixIcon = "lock" > < input formControlName = "password" nz-input type = "password" placeholder = "Password" /> </ nz-input-group > </ nz-form-control > </ nz-form-item > < nz-form-item > < nz-form-control > < button nz-button nzType = "primary" [disabled]="!validateForm.valid">Log in</ button > </ nz-form-control > </ nz-form-item > </ form > |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | validateForm!: FormGroup; submitForm(): void { for ( const i in this .validateForm.controls) { this .validateForm.controls[i].markAsDirty(); this .validateForm.controls[i].updateValueAndValidity(); } } constructor( private fb: FormBuilder) {} ngOnInit(): void { this .validateForm = this .fb.group({ userName: [ null , [Validators.required]], password: [ null , [Validators.required]], remember: [ true ] }); } |
此类表单校验较为单一,或者要求比较低,通常即为required校验,错误信息提示也多为固定不变。
智能化校验
表单一旦开始有具体的细节校验或者复杂的业务参杂,校验提示必须准确、清晰。
userName
为例,除了为必填项,必然需要符合某种格式,亦或是指定邮箱格式等,那么校验必须同时反映出错误类型,本例假设用户名有长度要求进行演示。
1 2 3 4 5 | < nz-form-control [nzErrorTip]="getErrTipByField('userName')"> < nz-input-group nzPrefixIcon = "user" > < input formControlName = "userName" nz-input placeholder = "Username" /> </ nz-input-group > </ nz-form-control > |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | export class SimpleFormComponent implements OnInit { validateForm: FormGroup; errMessageMap = {}; constructor( private fb: FormBuilder ) { } ngOnInit() { this .errMessageMap = { userName: { required: 'please input your name!' , minlength: 'please input at least least 5 character' }, password: { required: 'please input your password!' } }; this .validateForm = this .fb.group({ userName: [ null , [Validators.required, Validators.minLength(5)]], password: [ null , [Validators.required]], remember: [ true ] }, { updateOn: 'change' }); } submitForm(): void { if ( this .validateForm.controls) { for ( const i in this .validateForm.controls) { if ( this .validateForm.controls[i]) { this .validateForm.controls[i].markAsDirty(); this .validateForm.controls[i].updateValueAndValidity(); } } } } getErrTipByField(fieldName) { const errors = this .validateForm.get(fieldName).errors; let errMsg = '' ; for ( const key in errors) { if (errors.hasOwnProperty(key)) { errMsg += this .errMessageMap[fieldName][key]; } } return errMsg; } } |
构建出一个数据对象,以满足不同字段下不同错误类型的错误提示,根据业务需求,决定是否显示全部错误信息或者按照业务优先级显示。
其它细节
表单校验时机可以设置,默认为change
,可选blur
、submit
表单验证正确的,想要提示勾号可以添加属性 nzHasFeedback
submit中那段代码是重新对表单进行验证了,一般验证中是不需要的,动态表单验证后续结合自定义表单服务进行演示。
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