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我有一个像下面这样的按钮，当我按下“空格”时它会打开一个模式

<button type="button" (keydown.space)="openLg()" class="btn btn-link"></button>

我想将焦点放在下面的输入字段上

<input class="form-control" type="text" id="amount" name="amount" [(ngModel)]="totalAmt_modal">

openLg 函数是

openLg() { 
    
 this.renderer.selectRootElement('#amount').focus();

}

我也导入了 renderer2

import { Component, OnInit, Renderer2} from '@angular/core';

constructor(private renderer: Renderer2){}

但是当我按下空格按钮时，它会显示以下错误

core.js:4352 ERROR Error: The selector "#amount" did not match any elements
    at EmulatedEncapsulationDomRenderer2.selectRootElement (platform-browser.js:679)
    at BaseAnimationRenderer.selectRootElement (animations.js:267)
    at VoucherentryComponent.setfocus (voucherentry.component.ts:347)
    at VoucherentryComponent.openLg (voucherentry.component.ts:320)
    at VoucherentryComponent_tr_52_Template_button_keydown_space_2_listener (voucherentry.component.html:75)
    at executeListenerWithErrorHandling (core.js:15214)
    at wrapListenerIn_markDirtyAndPreventDefault (core.js:15249)
    at platform-browser.js:582
    at platform-browser.js:1281
    at ZoneDelegate.invoke (zone-evergreen.js:364)

解决办法是什么？我究竟做错了什么？

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0 回答 0