Elementref is undefined. An ElementRef is backed by a render-specific element.

Elementref is undefined Angular TemplateRef class ElementRef < T = any > {constructor (nativeElement: T) nativeElement: T} Descriptionlink. ViewChild is undefined in angular 13. In your case I guess you need two different @ViewChild() one for the component reference to be able to access the show() method, and a 2nd one to be able to access DOM attributes. 6. Angular also inject ElementRef of the Host element of the component or directive when you request for it in the constructor. Aug 28, 2017 · @ViewChild('alert', { read: ElementRef }) alert:ElementRef; See also angular 2 / typescript : get hold of an element in the template. Sep 18, 2021 · The reason for the undefined reference is due to the fact view queries are set before the AfterViewInit Angular lifecycle method is called and since the ngIf is intially set to false during initial component property binding, the view query was not executed by Angular change detection. ElementRef @ViewChild('someNameInput') someNameInput: ElementRef; Right before the constructor() method. (Field is defined). that element is not becoming accessible, it is logged undefined both in ngOnInit & ngAfterViewInit method. Video is fetched from API and it is . However when click the button and go here the Container ElementRef is undefined. Discover how to resolve the issue of `ElementRef` b Aug 31, 2023 · In this tutorial, let us explore how to use ElementRef to get the reference of an HtmlElement & manipulate the DOM in Angular Applications. searchElement. nativeElement. An ElementRef is backed by a render-specific element. Or different solution is, the reason that we encountered this issue is element is not If a child query (viewChild or contentChild) does not find a result, its value is undefined. contentElement = el Jul 19, 2022 · I am having a problem that my @ViewChild('video') video!: ElementRef; is undefined. 3. it may be because *ngIf="valueStar !== -1 && measurementName === ''" evaluates to false in tests. someNameInput. nativeElement property on the @ViewChild('username') input property and learned how to use a generic type. I’ve read that this can happen when you reference an element on the page using the # identification (#knowledgeTextarea) inside an *ngIf block. Nov 15, 2021 · 2. Jun 16, 2021 · Why is nativeElement of elementRef undefined? 2. May 7, 2020 · The decorator offers loads of functionality. 2. My goal is to extract video duration , code is as follows Aug 26, 2016 · The accepted answer is correct in all means and I stumbled upon this thread after I couldn't get the Google Map render in one of my app components. Now I want to access a function inside the last rendered component. searchElement); // return undefined to me also [Solution] @ViewChildren('search') public searchElement: ElementRef; console. toArray()[0]); // will return properly. *Table Of Content: * ElementRef; Getting ElementRef in Component Class; ElementRef Example; ElementRef in Custom Directive; ElementRef & XSS Injection Attack; Refrence; ElementRef Jul 29, 2022 · We’ve covered how to use ViewChild and how it can return us an ElementRef, and we’ve explored the . . The answer is to use ViewChildren instead of ViewChild. mp4 format. I need to set currentTime to my video, so it should not play from the beginning. If I use @ViewChild('element') element: ElementRef; all is fine, but if I use for instance @ViewChild('prompt') prompt: MdSlideToggle; the 'prompt' value is undefined. I am having a page with embedded video. In the browser, this is usually a DOM element. Jun 4, 2019 · I had a similar problem where ViewChild component is undefined in onInit() method. Mar 9, 2023 · We use the ViewChild to get the ElementRef of an HTML element in the component class. value); } If you get some value is undefined, it's usually means that it's a JavaScript issue and you don't have something initialized. This may occur if the target element is hidden by a control flow statement like @if or @for. Plunker example Apr 15, 2021 · import {Component, ElementRef, HostBinding, ViewChild} from '@angular/core'; export class MainPage { constructor( el: ElementRef ) { this. obviously @ViewChild("measurementBoxStar") measurementBox: ElementRef; is not returning any elements. Angular: Access elementRef inside an ng-template. The issue as previously mentioned is the ngIf which is causing the view to be undefined. 在浏览器中，通过 ElementRef 我们就可以封装不同平台下视图层中的 DOM 元素，最后借助于 Angular 提供的强大的依赖注入特性，我们就可以轻松地访问到 DOM 元素。 class ElementRef < T = any > {constructor (nativeElement: T) nativeElement: T} Aug 25, 2017 · ElementRef is undefined when using @ViewChild. I've found another solution that avoids any race conditions or timers. 0. 14. Aug 31, 2017 · ElementRef is undefined in TemplateRef. And here is how you would use it in a function. log(this. We will see examples of how to use it and discuss real-life Jan 22, 2022 · I got a component that renders different form-field components via ng-template. Sep 22, 2017 · When I try to access to a material component using @ViewChild from the unit tests I recieve undefined. I need to use MdSlideToggle instead of ElementRef because I need to access Oct 18, 2016 · ElementRef is undefined in TemplateRef. Because of this, the child queries return a signal that include undefined in their value type. Nov 4, 2016 · Because in that case, in my experience, reading a @ViewChild as a ElementRef produces no results . clickMe(){ console. In this tutorial, let us explore how to use ElementRef to get the reference of an HtmlElement & manipulate the DOM in Angular Applications. So changing your spec as follows should fix the problem. Nov 20, 2021 · The ! operator is the non-null assertion operator, which serves the purpose of telling Angular not to throw errors regarding the homeBtn variable being null or undefined Jan 18, 2018 · I have the same issue as Magnus where @ViewChildren still has a chance of being undefined during ngAfterViewInit. Type 'ElementRef' is not generic. child. Angular中使用 ElementRef 获取DOM. Constructorlink Feb 18, 2018 · @ViewChild('search') public searchElement: ElementRef; console. Change your @ViewChild variable to a set function, and store the ElementRef in a separate variable. Feb 15, 2022 · But when I uncomment the last line of ngAfterViewInit method, it crashes with error: Property 'value' does not exist on type 'ElementRef' I have tried this. Would like to know what I am missing where it works from the input listener but not when directed from the click listener. In my case, there was *ngIf applied on the control that's why instance of child was undefined then I removed and checked and it worked for me Jul 28, 2021 · In previous versions of Angular we could just define a ViewChild with an ElementRef like so @ViewChild('fileInput') fileInput: ElementRef; Now we have to initialize it in the constructor. 1 In Angular (Angular 4) ,Not able to access the ElementRef of another Component using @ViewChild. Asking for help, clarification, or responding to other answers. If your component has the data already resolved (like the case when a parent passes a child data object to a sub component) it should work (at least for me it did). Initializing an Array of ElementRefs in Angular. In this article, we will deep dive into @ViewChild, ElementRef,ViewChildren decorators. Provide details and share your research! But avoid …. 1 Jan 5, 2022 · @ViewChild('videoPlayer') myVidElement: ElementRef; I have html5 video elemnt in markup with view child as above. This fixed the issue: // Ensure Change Detection runs before accessing the instance @ContentChild('foo', { static: false }) foo!: ElementRef; // If you need to access it in ngOnInit hook @ViewChild(TemplateRef, { static: true }) foo!: TemplateRef; Even after following everything from the accepted answer, you are getting undefined instance of child component then kindly check if that component is visible. I had similar issue where I didn't want a grid to be shown until all the reference data had been loaded. 0 @ViewChild("childRef") childElementRef -- Cannot read properties of undefined. Nov 29, 2018 · Cannot read property ‘nativeElement’ of undefined. value but this one leads to another error: Cannot read properties of undefined (reading 'value') Jun 20, 2020 · When go to this method, when the input listener of the text field is triggered it works fine. TemplateRef constructor injection No provider for TemplateRef. Apr 5, 2017 · @ViewChild('nameForMaterialElement', {read: ElementRef}) private nameForMaterialElement: ElementRef; The reason is that md-radio-button is an angular component (which itself is a directive) and ViewChild returns the whole component if you do not specify the read option Learn how to properly use `ElementRef` in Angular, especially in popups and when using `ngAfterViewInit`. I tried accessing it with the ViewChildren() annotation with the string selector or the BaseClass all field-components (text-field, select-field) extend from. Feb 8, 2023 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. lcfj meprw vlmjdl omlgah nfohkddd cpydn aujrey zpbrna muqctz xgvqb lmqk tlcews chtosj yyux boeowj