我需要获取材料下拉列表<mat-select>
的选定文本而不是其值:
<ng-container matColumnDef="fr">
<th mat-header-cell *matHeaderCellDef> Family Rel. </th>
<td mat-cell *matCellDef="let element; let i = index;">
<div [formGroupName]="i">
<mat-form-field color="warn" appearance="outline">
<mat-label>Family Relation</mat-label>
<mat-select #familyRelation (selectionChange)="onChange(element, i, 'hh')" id="family_relation"
formControlName="fr" placeholder="Family Relation">
<mat-option *ngFor="let familyRelation of familyRelationArray;" [value]="familyRelation.family_relation_id">
{{familyRelation.family_relation_type}}
</mat-option>
</mat-select>
</mat-form-field>
</div>
</td>
</ng-container>
这就是我想要做的事情:
@ViewChild('familyRelation') familyRel: ElementRef;
在下拉列表的更改选择上:
onChange(data, i, type) {
let c = this.familyRel.nativeElement.innerText;
console.log(c)
}
我遇到以下错误:
错误TypeError:无法读取未定义的属性'innerText' 在
当我删除innerText
时,控制台值为:
未定义
在stackblitz中可以看到我需要的,如果我选择了Parent
,我想将Parent
放入变量,而不是1
,它是其{ {1}}。
请注意,id
中的element
,i
和hh
在该函数的后面使用,所以现在就算了吧。
答案 0 :(得分:7)
很抱歉迟到了派对。阅读以上所有答案我真的很震惊...
该解决方案比任何提出的答案都要容易和直接得多,因为select组件只是将所选模型作为selectionChange
参数的一部分传递。
但是首先,对您的示例进行一些更正。您已经声明了接口,因此请使用它:
export interface FamilyRelation {
id: number;
type: string;
}
因此,在您的构造函数中:
constructor() {
this.familyRelationArray=[
{
id: 1,
type: 'Parent'
},
{
id: 2,
type: 'Sister'
}
]
}
而不是您放入StackBlitz中的内容...然后您的视图将变为:
<mat-select (selectionChange)="onChange($event)" id="family_relation" placeholder="Family Relation">
<mat-option *ngFor="let familyRelation of familyRelationArray;" [value]="familyRelation.id">
{{familyRelation.type}}
</mat-option>
</mat-select>
每个垫子选项都不需要(click)处理程序,因为这是不必要的,如果有很多选择项,则可能导致性能问题。现在,在控制器上:
onChange(ev: any) {
let optionText = ev.source.selected.viewValue;
console.log(optionText);
}
,或者,如果愿意,还可以输入类型变量:
onChange(ev: MatSelectChange) {
let optionText = (ev.source.selected as MatOption).viewValue; //use .value if you want to get the key of Option
console.log(optionText);
}
但不要忘记进口...
import { MatSelectChange } from '@angular/material/select';
import { MatOption } from '@angular/material/core';
答案 1 :(得分:3)
您可以添加索引以使用mat-option循环,然后将其传递给onChange()方法,它将允许您从数组中获取选定的元素。
<mat-select #familyRelation (selectionChange)="onChange($event.value, element, i, 'hh')" id="family_relation" placeholder="Family Relation">
<mat-option *ngFor="let familyRelation of familyRelationArray; let i=index" [value]="i">
{{familyRelation.family_relation_type}}
</mat-option>
</mat-select>
onChange(index, data, i, type) {
console.log(this.familyRelationArray[index].family_relation_type);
}
您在这里有更新代码:link
答案 2 :(得分:2)
使用compareWith
<mat-select #familyRelation [compareWith]="compareFn" id="family_relation" formControlName="fr" placeholder="Family Relation">
<mat-option *ngFor="let familyRelation of familyRelationArray;" [value]="familyRelation.family_relation_id">
{{familyRelation.family_relation_type}}
</mat-option>
</mat-select>
compareFn(data1 , data2){
}
compareWith
侦听“ change”事件,因为在Firefox中没有为选择触发“ input”事件。 DOC。
答案 3 :(得分:2)
更新了代码,并在click
上添加了options
事件
https://stackblitz.com/edit/angular-material-w89kwc?embed=1&file=app/app.component.ts
添加了一个功能
getInnerText(innerText){
console.log(innerText)
}
在视图中添加了点击事件
<mat-option *ngFor="let familyRelation of familyRelationArray;" [value]="familyRelation.family_relation_id" (click)="getInnerText(familyRelation.family_relation_type)">
{{familyRelation.family_relation_type}}
</mat-option>
答案 4 :(得分:1)
虽然有点晚了,但是答案启发了我一下,这里有个主意:
export interface IFamilyGroup{
id: number;
name: string;
address: string;
}
familyGroup: IFamilyGroup[];
getSelectOption( family: IFamilyGroup ): void {
console.log(family);
}
<mat-select (selectionChange)="getSelectOption( familyGroup[$event.value] )">
<mat-option>none</mat-option>
<mat-option
*ngFor="let family of familyGroup; let i = index"
value="{{i}}">
{{ family.name }}
</mat-option>
</mat-select>
此方法的缺点是您不能使用formControlName,因为mat-option使用index作为值,因此,如果要匹配formgroup,可以将其更改为:
// this is formgroup data model
export interface IFamilyGroup{
id: number;
name: string;
address: string;
}
export interface IFormGroupDataForm{
family: FormControl;
whatever1?: FormControl;
whatever2?: FormControl;
}
dataForm: FormGroup;
family = new FormControl();
familyGroup: IFamilyGroup[];
constructor(
private formBuilder: FormBuilder
) { }
ngOnInit(): void {
this.initFormGroup();
}
private initFormGroup() {
dataForm = this.fromFormGroupModel({
family: this.family
// any you need...
});
}
private fromFormGroupModel( model: IFormGroupDataForm ): FormGroup {
return this.formBuilder.group(model);
}
getSelectOption( family: IFamilyGroup ): void {
this.family.setValue(family); // set family data object be value
}
<div [formGroup]="dataForm">
<mat-select (selectionChange)="getSelectOption( familyGroup[$event.value] )">
<mat-option>none</mat-option>
<mat-option
*ngFor="let family of familyGroup; let i = index"
value="{{i}}">
{{ family.name }}
</mat-option>
</mat-select>
//...
</div>
答案 5 :(得分:0)
您可以使用此方法。
<mat-select [(ngModel)]="job" #jobMatSelect placeholder="-Select Job-" class="form-control" required>
<mat-option *ngFor="let item of Jobs" [value]="item.jobId" [disabled]="item.status == false" [ngClass]="{'col-red':item.status == false}"> ({{item.viewValue}})</mat-option>
</mat-select>
Component.ts
@ViewChild('jobMatSelect') private jobMatSelected: MatSelect;
this.jobSelected = this.jobMatSelected.triggerValue;