Muaj pes tsawg validators muaj nyob rau hauv angular?

2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47

Nco ntsoov tias: Lub npe tswj teeb tsa ob lub built-in cov validators - Cov validators .yuav tsum tau thiab Cov validators .minLength(4) -thiab ib qho kev cai tus validator , forbiddenNameValidator. Yog xav paub ntxiv mus saib Custom cov validators ntu hauv phau ntawv qhia no.

Ib yam li ntawd, tib neeg nug, dab tsi yog validators nyob rau hauv angular?

A validator hauv Angular yog ib txoj haujlwm uas rov qab tsis tau yog tias qhov kev tswj tau siv tau lossis qhov khoom yuam kev yog tias nws tsis raug. Rau cov qauv-tsav cov ntaub ntawv peb tsim kev cai validation functions thiab dhau lawv mus rau hauv lub FormControl constructor.

Kuj Paub, FormControl yog dab tsi hauv angular? FormControl tuaj yeem siv standalone nrog rau HTML daim ntawv cim npe. Angular siv peb lub hauv paus thaiv los tsim lub kaum sab xis reactive daim ntawv uas yog FormControl , FormGroup thiab FormArray. FormControl : Nws yog ib chav kawm uas siv tau thiab teeb tsa qhov tseem ceeb thiab siv tau ntawm a daim ntawv tswj zoo li thiab tag.

Hauv qhov no, pes tsawg hom angular 4 daim ntawv muaj?

ob

Ng qias neeg yog dab tsi?

Cov ng - qias neeg chav kawm qhia rau koj tias daim ntawv tau raug hloov kho los ntawm tus neeg siv, whereas tus ng -pristine chav kawm qhia koj tias daim ntawv tsis tau hloov kho los ntawm tus neeg siv. Yog li ng - qias neeg thiab ng -pristine yog ob sab ntawm tib zaj dab neeg. Cov chav kawm yog teem rau txhua qhov chaw, thaum daim ntawv muaj ob lub zog, $ qias neeg thiab $pristine.