ng-select不起作用的焦点 Angular 5

Question

我正在尝试在角度 5 中使用 ng-select 的焦点，但它不起作用

我正在使用 ng2-select

---

如何在 Angular 5 中使用焦点进行 ng-select ？

<label class="input">
<input (blur)="goTo()" type="text">
</label>
<label class="select" >
<div *ngIf="items.length > 0" >
<ng-select     #select [items]="items">
</ng-select>
</div>
</label>


@ViewChild('select') myElement: ElementRef;
goTo(){
this.myElement.element.nativeElement.focus();
}

Answer 1

这对我来说很好用，

@ViewChild('ngSelect') ngSelect: NgSelectComponent;
ngAfterViewInit() {
if (this.autofocus) {
setTimeout(() => {
this.ngSelect.focus();
});
}
}

请参阅 https://github.com/ng-select/ng-select/issues/762

Answer 2

更改此内容

goTo(){
this.myElement.element.nativeElement.focus();
}

对此，

import { ChangeDetectorRef } from '@angular/core';
constructor (private cRef: ChangeDetectorRef) {}
// import 'SelectComponent' from your library for 'ng2-select'
goTo(){
let el = null;
if (this.items.length > 0) {
this.cRef.detectChanges();
el = (this.myElement.nativeElement as SelectComponent).element.nativeElement.querySelector('div.ui-select-container > input');
if (el) { el.focus(); }
}
}

您可能需要检查元素是否已定义(或者您是否需要额外的"nativeElement"，但我基本上在这里重用了逻辑。

只是一个警告，如果库更新以重命名这些类或修改模板，这可能不是一个稳定的修复程序。

希望对您有所帮助。

Answer 3

快速回复，在此解决方案中，每个选定的元素都会被记录以备将来使用(在这种情况下，模糊(。这需要适应您的情况。

import { Component, OnInit } from '@angular/core';
import { ViewChildren, QueryList } from '@angular/core';
@Component({
selector: 'app-editor',
templateUrl: './editor.component.html',
styleUrls: ['./editor.component.css']
})
export class EditorComponent implements AfterViewInit {
// Viewchildren
// https://netbasal.com/understanding-viewchildren-contentchildren-and-querylist-in-angular-896b0c689f6e
myindex:number;
@ViewChildren("select") inputs: QueryList<any>
constructor() { 
this.myindex=0
}
// You will have to setup some input parameters in this function in order to switch to the right "select", (you have control)
private goTo() 
{
// focus next input field
if (this.myindex +1 < this.inputs.toArray().length)
{
this.inputs.toArray()[this.myindex +1].nativeElement.focus();
this.myindex = this.myindex + 1;
}
else {
this.inputs.toArray()[0].nativeElement.focus();
this.myindex = 0;
}
}
private processChildren(): void {
console.log('Processing children. Their count:', this.inputs.toArray().length)
}
ngAfterViewInit() {
console.log("AfterViewInit");
console.log(this.inputs);
this.inputs.forEach(input => console.log(input));
// susbcribe to inputs changes, each time an element is added (very optional feature ...)
this.inputs.changes.subscribe(_ => 
this.processChildren() // subsequent calls to processChildren
);
}

}

Answer 4

一个简单的方法，你也可以这样做。

<label class="input">
<input (blur)="goTo(select)" type="text">
</label>
<label class="select">
<div *ngIf="items.length > 0">
<ng-select #select [items]="items">
</ng-select>
</div>
</label>

并在打字稿文件中。

goTo(select){
select.focus();
}