blocks|key|3816589|text|是的，@ViewChild不适用于结构指令控制下的元素。有两个解决办法可供您应用：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3816590|删除*ngIf指令并使用CSS+style:+'display:none'隐藏元素。|ordered-list-item|3816591|使用vanilla+document.getElementById('someId');从DOM中选择元素，然后对元素进行对焦。|3816592|我更喜欢第1点。|3816593|entityMap^0|3|A|0|2|5|G|L|0|A|Y|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|I|3|J|5|H|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|K|3|L|5|6|7|Z|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|N|$]]

Yes <code>@ViewChild</code> will not work for elements who are under the control of a structural directive. There are two workaround that you can apply:

<ol>
<li>Remove the <code>*ngIf</code> directive and hide the element using CSS <code>style: 'display:none'</code>.</li>
<li>Select the element from the DOM using vanilla Javascript <code>document.getElementById('someId');</code> and then focus the element.</li>
</ol>

I will prefer point 1.

blocks|key|3816632|text|如果您正在寻找模板引用变量，也可以通过模板引用变量进行此操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3816633|中的html|offset|length|style|BOLD|3816634|<input+#text+type="text"+id="textInput">
<input+#number+type="number"+id="numericInput">

<button+(click)="editButtonClicked($event,+text,+number)">+Click+</button>|code-block|syntax|javascript|3816635|in+ts|3816636|editButtonClicked(e,+text,+number){
++++if(text.value)+{
++++++text.focus()
++++}+else+{
++++++number.focus()
++++}
++}|3816637|entityMap^0|0|0|6|0|0|0|5|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|R|$]]

you can also do this by template reference variable if that's what you are looking for

in html

<pre><code>&lt;input #text type="text" id="textInput"&gt;
&lt;input #number type="number" id="numericInput"&gt;

&lt;button (click)="editButtonClicked($event, text, number)"&gt; Click &lt;/button&gt;
</code></pre>

in ts

<pre><code>editButtonClicked(e, text, number){
 if(text.value) {
 text.focus()
 } else {
 number.focus()
 }
 }
</code></pre>

blocks|key|1538573|text|您可以实现一个超级简单的指令，并具有所需的效果。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1538574|html|offset|length|style|BOLD|1538575|<input+type="text"+autoFocus+*ngIf="isInputVisible">|code-block|syntax|javascript|1538576|指令|1538577|import+{+Directive,+ElementRef,+OnInit+}+from+"@angular/core";

@Directive({
++selector:+"[autoFocus]"
})
export+class+AutoFocusDirective+implements+OnInit+{
++private+inputElement:+HTMLElement;

++constructor(private+elementRef:+ElementRef)+{
++++this.inputElement+=+this.elementRef.nativeElement;
++}

++ngOnInit():+void+{
++++this.inputElement.focus();
++}
}|1538578|工作演示：|1538579|https://stackblitz.com/edit/angular-ivy-vvgcch?file=src%252Fapp%252Fdirectives%252Fauto-focus.directive.ts|1538580|entityMap|0|LINK|mutability|MUTABLE|url|https://stackblitz.com/edit/angular-ivy-vvgcch?file=src%252Fapp%252Fdirectives%252Fauto-focus.directive.ts^0|0|0|4|0|0|0|2|0|0|0|5|0|0|2S|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@$D|14|E|15|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|16|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|17|8|@$D|18|E|19|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|1A|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1B|8|@$D|1C|E|1D|F|G]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1E|8|@]|9|@$D|1F|E|1G|1|1H]]|A|$]]|$1|U|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]]]

You could implement a super simple directive and have the desired effect.
html
<pre><code>&lt;input type=&quot;text&quot; autoFocus *ngIf=&quot;isInputVisible&quot;&gt;
</code></pre>
directive
<pre><code>import { Directive, ElementRef, OnInit } from &quot;@angular/core&quot;;

@Directive({
 selector: &quot;[autoFocus]&quot;
})
export class AutoFocusDirective implements OnInit {
 private inputElement: HTMLElement;

 constructor(private elementRef: ElementRef) {
 this.inputElement = this.elementRef.nativeElement;
 }

 ngOnInit(): void {
 this.inputElement.focus();
 }
}
</code></pre>
Working Demo:
<a href="https://stackblitz.com/edit/angular-ivy-vvgcch?file=src%2Fapp%2Fdirectives%2Fauto-focus.directive.ts" rel="noreferrer">https://stackblitz.com/edit/angular-ivy-vvgcch?file=src%2Fapp%2Fdirectives%2Fauto-focus.directive.ts</a>

I have two input elements that are shown under <code>*ngIf</code> conditions.

<pre><code>&lt;input type="text" id="textInput" *ngIf="showTextInput"&gt;
&lt;input type="number" id="numericInput" *ngIf="showNumericInput"&gt;

&lt;button (click)="editButtonClicked($event)"&gt;
</code></pre>

Clicking on the button should set focus to the appropriate input element.

<pre><code>editButtonClicked(event) {
 // Focus on either #textInput or #numericInput element
}
</code></pre>

I've looked into ElementRef to give the html input elements tags like <code>#textInput</code> and then define them on the class for example:

<pre><code>@ViewChild('textInput') textInput: ElementRef;
</code></pre>

...but apparently this does not work on elements that have <code>*ngIf</code> conditionals.

How can I focus on an input element, onClick of a button?

Angular - Focus on input element that has ngIf

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有两个输入元素，它们在*ngIf条件下显示。<input type="text" id="textInput" *ngIf="showTextInput"><input type="number" id="numericInput" *ngIf="showNumericInput"><button (click)="...

问角度聚焦于具有ngIf的输入元素。
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问角度聚焦于具有ngIf的输入元素。EN