如何在Angular Material中将tab键设为回车键? [英] How to make tab key as enter key in Angular Material?

问题描述

这是我的角度材料自动完成代码

<div [隐藏]=IsCascading"><mat-autocomplete [id]="collectionType";#auto="matAutocomplete"(optionSelected)='onChange($event)'><mat-option *ngFor="let items of codeList";[值]=items.text"；[attr.data-text]='items.text' [id]=items.value">{{items.text}}</mat-option></mat-autocomplete>

Angular 材料在 tab 选择时有问题.例如，在单击 tab 按钮时，材料自动完成无法选择值.但是在单击 enter 按钮时它正在工作.因此，我需要手动覆盖 tab 键事件上的 enter 键事件.怎么可能?

解决方案

改进我的评论，并根据回复我们可以创建一个指令

import {指示，在视图初始化之后，在销毁，可选的来自'@angular/core';进口 {MatAutocompleteTrigger来自'@angular/material';@指示({选择器:'[制表符指令]'})导出类 TabDirective 实现 AfterViewInit、OnDestroy {可观察的:任何；构造函数(@Optional()私有自动触发器:MatAutocompleteTrigger){}ngAfterViewInit() {this.observable = this.autoTrigger.panelClosingActions.subscribe(x => {如果(this.autoTrigger.activeOption){this.autoTrigger.writeValue(this.autoTrigger.activeOption.value)}})}ngOnDestroy() {this.observable.unsubscribe();}}

您使用:

(参见 stackblitz)

更新我们只能控制tab.key，否则你总是关闭，你得到选定的值，所以

@Directive({选择器:'[制表符指令]'})导出类 TabDirective {可观察的:任何；构造函数(@Optional()私有自动触发器:MatAutocompleteTrigger){}@HostListener('keydown.tab', ['$event.target']) onBlur() {如果(this.autoTrigger.activeOption){this.autoTrigger.writeValue(this.autoTrigger.activeOption.value)}}}

(查看新的 stackblitz)

更新 2 我不相信这个答案有这么多赞成票，因为它是错误的.正如@Andrew allen 评论的那样，该指令不会更新控件.好吧，已经晚了，但我尝试解决.一种选择是使用

this.autoTrigger._onChange(this.autoTrigger.activeOption.value)

另一个想法是注入 ngControl，所以

constructor(@Optional() private autoTrigger: MatAutocompleteTrigger,@Optional() 私有控制:NgControl) {}ngAfterViewInit() {this.observable = this.autoTrigger.panelClosingActions.subscribe(x => {如果(this.autoTrigger.activeOption){常量值 = this.autoTrigger.activeOption.value;如果(this.control)this.control.control.setValue(值，{发出:假});this.autoTrigger.writeValue(value);}})}

this is my angular materiel auto complete code

<input type="search" id="setId" name="setId" [attr.list]='collectionType' [(ngModel)]="selValue" class="text-box"
  placeholder="--Select--" (focus)="ValidateParent()" (keyup.tab)="test()" (keyup)="EmitValues($event)" [id]="setId"
  [matAutocomplete]="auto" [title]="selValue" [placeholder]='WaterMarkText'>


<div [hidden]="IsCascading">
  <mat-autocomplete [id]="collectionType" #auto="matAutocomplete" (optionSelected)='onChange($event)'>
    <mat-option *ngFor="let items of codeList" [value]="items.text" [attr.data-text]='items.text' [id]="items.value">
      {{items.text}}
    </mat-option>
  </mat-autocomplete>
</div>

Angular material had a problem with tab selection.like the materiel auto complete not able to select the value while click the tab button. but it's working while click the enter button. So manually I need to overwrite the enter key event on tab key event. How could possible?

解决方案

Improve my comment, and based on the response we can create a directive

import {
    Directive,
    AfterViewInit,
    OnDestroy,
    Optional
} from '@angular/core';
import {
    MatAutocompleteTrigger
} from '@angular/material';


@Directive({
    selector: '[tab-directive]'
})
export class TabDirective implements AfterViewInit, OnDestroy {
    observable: any;
    constructor(@Optional() private autoTrigger: MatAutocompleteTrigger) {}
    ngAfterViewInit() {
        this.observable = this.autoTrigger.panelClosingActions.subscribe(x => {
            if (this.autoTrigger.activeOption) {
                this.autoTrigger.writeValue(this.autoTrigger.activeOption.value)
            }
        })
    }
    ngOnDestroy() {
        this.observable.unsubscribe();
    }
}

You use:

<input tab-directive type="text" matInput [formControl]="myControl" 
      [matAutocomplete]="auto" >

(see stackblitz)

Update We can control only tab.key, else always you close, you get the selected value, so

@Directive({
    selector: '[tab-directive]'
})
export class TabDirective {
    observable: any;
    constructor(@Optional() private autoTrigger: MatAutocompleteTrigger) {}

    @HostListener('keydown.tab', ['$event.target']) onBlur() {
        if (this.autoTrigger.activeOption) {
            this.autoTrigger.writeValue(this.autoTrigger.activeOption.value)
        }
    }

}

(see a new stackblitz)

Update 2 I don't believe this answer has so many upvotes because it's wrong. As @Andrew allen comments, the directive not update the control. Well, It's late, but I try to solve. One Option is use

this.autoTrigger._onChange(this.autoTrigger.activeOption.value)

Anohter idea is inject the ngControl, so

constructor(@Optional() private autoTrigger: MatAutocompleteTrigger,
    @Optional() private control: NgControl) {}
ngAfterViewInit() {
    this.observable = this.autoTrigger.panelClosingActions.subscribe(x => {
        if (this.autoTrigger.activeOption) {
            const value = this.autoTrigger.activeOption.value;
            if (this.control)
                this.control.control.setValue(value, {
                    emit: false
                });
            this.autoTrigger.writeValue(value);
        }
    })
}

这篇关于如何在Angular Material中将tab键设为回车键?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！