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[英]How to get the selected value and text from a dropdown on page load and on click a button with reactive form in angular 8
[英]How to get selected value and selected text of a dropdown on click a button in angular 7
我有一個下拉菜單 select,在這里單擊按鈕,我需要控制台選擇的文本(綠色..)和選擇的值(1..),我嘗試使用 ngmodel 但我只能捕獲值並且那里顯示空選項在 select 字段中。這是下面的代碼,
<select>
<option *ngFor="let status of statusdata" value="{{status.id}}">{{status.name}}</option>
</select>
<button type="submit" (click)="register()" class="btn btn-primary mr-1">Register</button>
import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
@Component({
selector: 'app-home',
templateUrl: './home.component.html',
styleUrls: ['./home.component.css']
})
export class HomeComponent implements OnInit {
dotsh:any;
hoverIndex:number = -1;
groups:any;
test:any;
constructor(private formBuilder: FormBuilder) {
}
onHover(i:number){
this.hoverIndex = i;
}
columns = ["name", "Items","status"];
ngOnInit() {
this.test = false;
this.statusdata = [{"id":1,"name":"green"},{"id":2,"name":"red"},{"id":3,"name":"yellow"}];
}
register(){
console.log('selected Value');
console.log('selected name');
}
}
如果您想要在選擇時將整個 object 存儲為一個值,您可以試試這個:
<select [(ngModel)]="value">
<option *ngFor="let status of statusdata" [ngValue]="status">
{{status.name}}</option>
</select>
然后在你的組件中聲明變量值,或者讓它未定義,或者將它分配給你想要的值(它需要是整個對象)。 例如:
export class HomeComponent implements OnInit {
statusdata = [{"id":1,"name":"green"},{"id":2,"name":"red"},{"id":3,"name":"yellow"}];
value = statusdata[0];
....
這應該默認為選擇的第一個選項。 然后,如果您只想打印該值:
console.log(this.value.id);
console.log(this.value.name);
為了達到預期的效果,請使用以下選項,在 component.html 和 commponent.ts 中使用 Formbuilder、FormGroup 和 Form Control 名稱
組件.html
[formGroup]="profileForm"
formControlName="name"
`組件.ts
3.聲明formgroup並使用formbuilder初始化名稱
profileForm: FormGroup
constructor(private formBuilder: FormBuilder) {
this.profileForm = this.formBuilder.group({
name: new FormControl(1)
});
4. 在按鈕上單擊使用this.profileForm.get('name').value
獲取值
register(){
console.log('selected Value', this.profileForm.get('name').value);
console.log('selected name', this.statusdata.filter(v => v.id == this.profileForm.get('name').value)[0].name);
}
示例工作代碼供參考 - https://stackblitz.com/edit/angular-unnal4?file=src/app/app.component.ts
有關反應式 forms - https://angular.io/guide/reactive-forms的更多詳細信息,請參閱此鏈接
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