import { Component, OnInit } from '@angular/core'; import { FormGroup, FormControl, FormArray } from '@angular/forms'; @Component({ selector: 'app-my-form', templateUrl: './my-form.component.html', styleUrls: ['./my-form.component.css'] }) export class MyFormComponent implements On...
formArray.valueChanges.subscribe(values=>{constcontrol=formArray.controls[0];if(control.value==='some value'){formArray.controls[1].enable();}else{formArray.controls[1].disable();}}); 根据表单值的变化显示相关信息: 代码语言:typescript
For example we have built a form: form =this.fb.group({ store:this.fb.group({ branch:'', code:''}), selector:this.createStock({}), stock:this.fb.array([]) }); We want to reponse to each time 'stock' value changes. To do that we can subscrube 'valueChanges' for form. Noti...
initForm(){this.form=newFormGroup({...});this.valueChanges=this.form.valueChanges.subscribe(...);} 是否需要 unsubscribe:需要。 原因:这种为无限事件流,虽然 component unmount 后,form 也不存在,但是这样会造成内存泄漏,导致性能下降等问题。 4、Dom 中的 fromEvent 事件监听(例如:Observable.fromEvent(this...
initForm(){this.form=newFormGroup({...});this.valueChanges=this.form.valueChanges.subscribe(...);} 是否需要 unsubscribe:需要。 原因:这种为无限事件流,虽然 component unmount 后,form 也不存在,但是这样会造成内存泄漏,导致性能下降等问题。
这就是我们的函数settypeList变得像settypeList(x){let arr=new FormArray([]);x.typeList.forEach((y) => { //first we create the group const group=this.fb.group( { subQuota: y.subQuota, device: y.device, } ) //subscribe to valueChanges group.get('device').valueChanges.pipe( ...
this.formArray.valueChanges.pipe(takeWhile(()=>this.alive)) .subscribe((res) => { this.onTouched() const response = res.indexOf(true) >= 0 ? this._data.filter((x, index) => this.formArray.value[index]) : null this.onChange(response == null ? null : this.key ? response.map(x...
Text|Slides|Angular formbuilder example Text|Slides|Angular reactive forms validation Text|Slides|Angular form control valuechanges Text|Slides|Loop through all form controls in formgroup in reactive form Text|Slides|Move validation messages to the component class in reactive form ...
Warning! Although the component contains the select and the remove events, the better solution is using valueChanges of the FormControl. import {Component} from '@angular/core'; import {FormControl} from '@angular/forms'; @Component({ selector: 'app-example', template: `<ngx-select [items]...
initForm(){this.form=newFormGroup({...});this.valueChanges=this.form.valueChanges.subscribe(...);} 1. 2. 3. 4. 是否需要 unsubscribe:需要。 原因:这种为无限事件流,虽然 component unmount 后,form 也不存在,但是这样会造成内存泄漏,导致性能下降等问题。