Ngif not working in child component. Angular2 - ngIf does not re-render the child component.

Ngif not working in child component Additional comment actions. For anyone else who is having issues with this and the CommonModule solution above didn't apply to them. Lazy loaded parent-child modules: This is also caused due to missing modules in lazy loaded modules of parent and child modules. Here is my child component: Render below? {{render}} <p *ngIf="render"> Content to be rendered </p> And this is the usage in main component: <app-test render="false"></app-test> Finally, this is the code: Ask questions, find answers and collaborate at work with Stack Overflow for Teams. component for example and inside the bus. Here is how the template looks like (note that I only have developed one of the two inner components for now, so I used a placeholder in stead of When using ngIf, angular completely removes the node from markup. name on the page. I am beginner to Angular. display component based on a conditional. that means, that not calling it you are not instancing it and, therefore, not passing through its ngOnInit. Then add an id to your child component in your parent component html. The component renders on the second time. Here is the setup: The parent component nests a child component . Angular doc says we should use the child component injected by ViewChild in ngAfterViewInit. The animation that you see in the beginning is happening because the component is created (loaded into DOM) and it loads the div for the first time. userList = this. ts file like this :. <app-bibdpayment *ngIf="show" (close)= "close()"></app-bibdpayment> By doing this: <my-wrapper *ngIf="false"> <my-component></my-component> </my-wrapper> You are not calling MyComponent component, because the *ngIf is false. component. Any help would be appreciated. user. Commented Jan 20, 2021 at 9:00. Hot Network Questions Before I had create grand child using directive, and everything is work normal until I using directive *ngIf in grandchild component, *ngIf is not working. and then combine *ngIf="child1WasActivated " [hidden]="!showChild2". "even if the component is not visible ?" - that's not how *ngIf works. Angular 5. The child component has a check box which is rendered; the person name, status and department are not rendered. If you have the following template for parentComponent <childComponent [links]="roleLinks></childComponent> Then roleLinks will be assigned from the parent component to the child This is a child component. logs show the arrays. /model/ When isOpen is changed externally, the :enter animations for the child elements of app-slide-menu work, however, the :leave animations don't when isOpen = false. CompB has an ngIf condition and based on an observable which is shared between CompA and CompB it is loading some data. ts export class ParentComponent implements OnInit, AfterViewInit { @ViewChild(ChildComponent, {static: false I tested this in all the other components' markups <p *ngIf="true">fubar</p> And it worked except for the one I added, which did not include this import, but after further digging I found that the import had been included in the parent component and was applied to it's children using the following code: Add an event triggered inside the ngAfterViewInit method of your child component (when possible, prefer this approach over the others). Thus the components are destroyed / created every time the user changes tabs. Checking parents *ngIf in children component. The console. For some reason, angular is not detecting the update to the variable in the callback. CommonModule and BrowserModule. onclick(){ showChild1=true; child1WasActivated = true; showChild2=false;}. With the condition being falsy, the component isn't hidden, it's simply not there, neither the class instance nor the DOM node. Currently, clicking the button will In a nutshell it's probably down to a child template using a parent value that has been modified after the child is rendered. Then you need to pass observable there, not expression: // in parent I may have misunderstood how canActivateChild works in Angular 11's routing. OnPush. CompA has as a child CompB. when a user clicks into it or when a child component emits an event; (b) when an @Input() value changes; or (c) when the async I am simply trying to nest a component inside a component and pass an array as the ngFor of the nested component. Angular ngIF not Working inside component. html: I've a problem using @ViewChild with a component showed through ngIf. Child component app-card-kpi-inline-overlay : // declare the event @Output() public created= new EventEmitter<any>(); // later on, trigger the event every time the component is rendered ngAfterViewInit() { this First of all, when using @Input decorator, you should use [primaryActionDisabled] binding. The problem is that you are providing the service at component level, that means, that all your components, that have the service added to providers array in component will have their own instance of service, so this is not a shared service at all. Using Angular 9, I have a child component where the ngOnInit function is called twice. This means that when the page loads, both those templates will be encapsulated within the ngIf and the button will hence not have access to the local variables. Angular RC5. component. Angular2 - ngIf does not re-render the child component. Can not show list with ngIf. userId = this. How to resolve this issue. The <app-services *ngIf="serviceText"></app-services> in the options. Theses zones are shown with some *ngIf. But sometimes you even can’t get it in ngAfterViewInit. It doesn't load it at all if the *ngIf statement is falsey. It's "blocked" by the first <ng-content></ng-content> despite the first one is in a *ngIf with false expression. Are you loading the child conditionally within an ngif? If yes, go for [hidden] instead of an ngif. between the behavior of the component when it's in a simple *ngIf and when it's included through <ng-content> inside an *ngIf. you can use [hidden] instead which only hide the div element so you can access it through template reference variable. log(this. i want display it only if the formControl value matches the given value. nativeElement. It seems like the *ngIf of the parent isn't delayed for the child animations/they don't even know they are dieing. Route definition: { path: "parent", component: ParentComponent, I believe the easiest thing you can do is you can have 2 flags for each child child1WasActivated and showChild1. Conditional is not working as expected? 3. child. I am trying to implement *ngIf in child component in my angular app. When we call the child component url directly. They code of the child is the same. Further up in the parent div i have an ngIf="documents", so I'm not sure its that. If I wait a few seconds the same code In Angular, @ContentChild and @ContentChildren decorators are used to access child components or directives that are projected into the component using the <ng-content> element. I have a number variable called currTab which is used to tab through three divs on the child component template. Observable with Async pipe not working inside *ngIf. Improve this question. required on phone number field in sign up form. Parent (form) component shows FirstCompnent and in FirstComponnt, it show SecondComponnet, Finally in SecondComopnent, I am showing TableComponent Ask questions, find answers and collaborate at work with Stack Overflow for Teams. I am experiencing an issue when I am updating a variable in the onComplete function which is bound to a *ngIf. value$); } parent. 1 Imports : Add a public method in your child component say init (). The first time, some of the @Inputs are undefined and the second time, all @Inputs are properly initialized. I found various solutions but no one usefull for me. Modified 7 years, 5 months ago. component for example, and I send the flag (which is true) with it to the other function in the bus. json with all the doc names readily translated - we pretty much have When we click on the button as I explained above, child component mounted and ngOnInit method will be called, you can also check the message on the console screen 'ngOnInit called: child component' but if I again click on the button, then the child component not re-render again and thus, ngOnInit method of child component not called. I had try to found the solution, but not found any thing to settle this problem. – Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company To further define what Markus means: when the *ngIf value changes on a route change, the router-outlet gets rendered instantly instead of waiting for the asyn guard. userList. TweetThe Angular @ViewChild decorator can be tricky to handle if the element or component it references also has an ngIf directive. Ask Question Asked 7 years, 5 months ago. 2. Asking for help, clarification, or responding to other answers. Checking parents *ngIf in children component i used the *ngif on a button that will be false and came true when the item is selectd from ng-select but its not working here is the button code &lt;button *ngIf="switch" (click)="productSaveI Current behavior. How can I access the table component from the parent component? ViewChild does not work from parent with the code below. _elRef. I'd really need to see your typescript for this component to be sure. In the parent component aka App component the ngIf works fine. This relates to Kendo UI sortable plugin with nested lists. parent. And that's why you are not getting the console log. As there is no way to capture the *ngIf event, so what I did as a hack is call the function again inside the function which needs the height of element if the element's height is 0. These decorators work with the content of the component, which is the content projected by the parent component. Why event emitter is not working. form: FormGroup; showChildForm: boolean; num: number; ngOnInit(){ If I have a component that I want to show or hide depending on a variable should I have the *ngIf on the component itself or the contents inside the component. angular ViewChild isnt working inside a ngIf statement. Hot Network Questions Iam assuming that, since the component itself has no animation, when the ngIf evaluates to false and destroys the component (removing it from DOM) it will just hide it and not play the animation. *ngIf not rendering in child component using @Import property. When I set this condition to be true I call next on the observable from CompA but data are not shown CompB is not yet initialized so that it subscribes to the observable here is the code: This is good example, but it doesn't work as I want, my problem is that I press submit button changeFlag(flag) in car. So you need to check that this element not exists. As a workaround, we can access the directive from out component using @ViewChildren: @ViewChildren(QueryHighlightDirective) dirs; And then call it's ngOnChanges method, once div is toggled. I want to use it based on the formControlName value of an input field. To ensure that @ViewChild is correctly initialized, you should use the ngAfterViewInit This is the child component. This may seem like a dumb question. Without seeing the rest of your component, I am guessing that it's using ChangeDetectionStrategy. App component the ngif works properly. Commented Jul 18, 2019 at 15:29. ts and included in parent. Because i try to avoid logic in ngOnChanges for dumb components which use onPush change detection. Dynamically create a component inside an ngIf. Pass component reference of anotherChild to my-nested-component when anotherChild is initalized (so dto and somethingElse were true), and my-nested-component is also there (so something was also true) TLDR. Have updated the logic to render the component outside *ngIf, there by ViewChild was able to successfully initialize the element. You can fix that by putting the *ngIf value change inside a setTimeout. I had the same issue because I created a new component with an embedded *ngIf inside of it running off of an internal class variable derived by logic inside of an ngOnChanges() method. – Nis. Improve I have CompA. 3. Provide details and share your research! But avoid . saveButton); // true } private save() { // save my item set by child } I found a work around. Modified 1 year, 10 months ago. But in his answer there is a problem sometimes, we might not know the time change detection takes to run, so after a tick was not working in my case. Which holds groups. We can solve this by using ViewChild in the component to make sure we get access to the local variables. Every time the tab is selected the map control is reloaded - causing the map to briefly I have a child a component that does not fire the condition for *ngIf. If you had a form control that was bound to the component inside a falsey *ngIf statement, and then you tried to access that form control inside the component the form control would be undefined because it was never instantiated, rather than it being created but hidden. This is not working with *ngIf, because when ngOnChanges fires, the second div and paragraph is not visible. UPDATE -- I made child component qr. However, even though the condition for ngIf is true, the child component is not found and the unit test fails. The component behaves differently When the component becomes visible I want to apply focus to a child element within its template. When tab is selected on the parent component template, the child component opens with the value of the previous instance. 3 Get a variable in child from parent, triggering it from the parent component Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company child. To test this, try: Maybe I am new to this. Angular - *ngIf not evaluating. Eg. What is the best pattern or approach to manage nested Components when they are not always there because of *ngIf? ngIf encapsulates all the elements inside the block including the element it's placed on. under the module of your component and if you are not sure just add it the app. To solve this, Import CommonModule or BroswerModule or both into app. In the component: private setSavebutton(_boolean: any) { this. g. Documentation says: ngIf evaluates the expression and then renders the then or else template in its place when expression is truthy or falsy respectively. Nothing I did would allow the ngIf to function to not render the component. Hence if possible, when ViewChild is required, alter the logic to render the component outside *ngIf and show appropriate messages. Viewed 818 times 1 . module. ts currentPage = 1; parent. Hot Network Questions I have child component in ngFor statement. but for various reasons it's not working. Improve this answer. I used formcontrol. Angular bug. — Check code here. See below Edit: I just don't know why, but change detection stop at the first child in the hierarchy. ts I want to make it shareable component-> qr-scanner , with input output. id; this. The Problem If I flip the Boolean value the component shows correctly but if I then try and get a reference to the child element using this. This component shows an animation made with GSAP library, when it ends it should hide this component and show a webpage. Try Teams for free Explore Teams. Explanation: To understand why this seemingly counter-intuitive solution works and is indeed the correct one you first need to know a little more about how inheritance works with angular: View child not working with *ngIf ionic3. tree. I've built a MatTable with expandable rows. list; this. @ViewChild ('child', {static: false }) coursesList!: CoursesListComponent Share. FirstLoginComponent is the parent component. e. Take the example below. I initially thought it was down to the fact that you placed the errorStateMatcher directive in a child template. Viewed 8k times Button click function does not find the child component function after using ngif. The specific question is why a child component listed in a parent's ngFor loop with data binding is not rendering the data in the list. Angular *ngIf Directive Does Not Trigger Change Detection When Bound to a Function. Ask Question Asked 7 years, 8 months ago. ” And the required component is here: In your exemple cases, they say that the child components is evaluated even if there is an upper if. Expected behavior So, I think the problem is that you are not assigning the roleLinks property in the parent component, but rather in the child component (where it is never used). If I manually invoke change detection one level deeper (in sch-job-detail), then the values are updated. You signed out in another tab or window. ts import { Component, OnInit } from '@angular/core'; import { Tree} from '. The tabs are shown/hidden using *ngIf and comparing the selected tab against an enum. This usually happens as the children are rendered before the parent is finished rendering. Viewed 512 times Send it like this to the child component <list-view [dataSet]="data" [isLoading]="isLoading$ | async"></list-view> Hope this helps. Commented Oct 17, I ran into this when my input element was in a Material Tab component, in the tab that was not visible by default I have done validation in Reactive Forms before but have never faced this issue. I can see the observable returning in the browser console so I know everything is working up to the point of the nested component render. import { BehaviorSubject } from 'rxjs'; @Injectable() export class LoaderService { private _loaderSource:any = new BehaviourSubject<any>({}); public loader = I have an Angular Module with a child component. @viewChild not working - cannot read property nativeElement of undefined. Use a different variable name and everything should work, so maybe something like <mat-option *ngFor="let doc of I've a component with a few *ngIf statements throughout, most of them like the following If this doesn't work, I am thinking there is an *ngIf on top of the ul where it is not true and therefore this ul is not being displayed. The "expandable" row part is Ngif conditional array and output to child component does not work. Usually this is fine, but one of the tabs contains a Bing map. I have a parent-child component that I want when user click on a button the selector of child component show something. Ask Question Asked 5 years, 11 months ago. isVisible). child component: export class child { @Input() user; @Input() list; listLength: number; showBtn: boolean = false; constructor(){} ngOnChanges(changes: SimpleChanges){ this. method not working in child component. Besides, the multiple *ngIf statements can clutter your template and require extra testing effort. With a route definition like the below one and canActivateChild returning false, ParentComponent isn't constructed but I'm expecting to have ParentComponent rendered while the child component not initialized and shown. Components in library do not work with ngIf/ngFor. Teams. For example, you have a Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company This code does not work because i and activeTabNo does not match and does not write content. Thank you! angular; typescript; components; *ngIf and child components. just put the variable on ngIf and follow my steps. 0. In my parent component i. myFlag = flag everything is fine in my console, but still false in my html page. how At this point everything works fine but when I try to nest it inside a ngIf statement - the functionality of the component stops working. ngIf is not working in child component. *ngIf="condition" is working. The issue is the array is from an observable and nothing is rendering for the nested component. 1 The Component 'photos' component will load if the variable photos is true <photos *ngIf="photos"></photos> Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. I have recently started working in Angular project but I am facing below bizarre error: “Can't bind to 'ngIf' since it isn't a known property of 'div'. ts. html is not toggling between showing or hiding as I expected. therefore your components will be just hidden if deactivated, but will be "lazily" activated I have no problem getting value changes render to child, but *ngIf only re render child if the value toggle from true to false, are there ways to enforce re render upon someobject value change. There are two sibling components (Release and Assets) and both have a shared component (version-actions), and both the sibling components are essentially inside two different mat-tab tags in the parent component. I use ngIf to render the child component, but when I click to change the form, the child component does not get destroyed and recreated. invalid and formcontrol. . I have a web page with a tab control taking up a portion of the screen. loader. First step is showed on page opening: But of course I'm facing difficulties! I have this component, TrackDetailComponent, in the template of which I would like to include 2 other components. Now this may be due to angular's unidirectional data flow. I have a parent component that calls in child component. To be more precise, it's just not rendered I want hide a div if some variable is null, but *ngIf is not working even if I assign true directly. Normally I wouldn't advice using that method but in this case I think there is no other way to fix that behaviour. Modified 7 years, 8 months ago. component I write this. Ask Question Asked 1 year, 11 months ago. A More Declarative Approach Instead of dealing with the hassle of multiple *ngIf statements, we can adopt a more declarative In my case, I had an input variable setter using the ViewChild, and the ViewChild was inside of an *ngIf directive, so the setter was trying to access it before the *ngIf rendered (it would work fine without the *ngIf, but would not work if it was always set to true with *ngIf="true"). yes 80% people were using *ngif ---> ngIf – pankaj. But, there are not placed in the right place ! The content must be in the second ng-content The problem with this solution is that we don't have control over the document names, so i can't build a . You switched accounts on another tab or window. length; // this updates This approach isn't complicated, but it’s a lot of repetition and the possibility of errors creeping in is high. ts: @Output() changeEvent = new EventEmitter<Model>(); ngOnInit() { // Once you subscribe the data from the service, emit an event passing data using event emitter this. touched The Child component is not updated because the component is already rendered to the dom, It works for the first time because you blocked the child component with an ngIf, meaning when you click the button for the first time, the boolean value becomes true, and therefore the child component got rendered. To fix it, If you had a form control that was bound to the component inside a falsey *ngIf statement, and then you tried to access that form control inside the component the form control would be Use of *ngIf: If the child component is conditionally rendered with *ngIf, it might not exist in the DOM when @ViewChild is queried, resulting in null. Will try this anyway and see if it resolves. On clicking on a button, it would switch from one inner component to the other. listLength = this. There's no reference to get. angular; Share. I can't work out how to get it to recognise new data. My problem is that second <ng-content></ng-content> is not working. emit(this. I want to test whether this child component exist in the parent component unit test. 1. Any help will be greatly appreciated!!! angular; ionic-framework; Share. – Anil Uttani. saveButton = _boolean; console. Reload to refresh your session. Or Hide the visibility of the elements using CSS, instead of *ngIf. I am using ionic 3 with animations. Ask Question Asked 8 years, As viewChild is showing undefined even when ngIf is true. In parent html: (click)="save()">Save</button> Why does the hidden work and the ngIf not? html; angular ngIf not working with ng-template. meaning since the child component can be initialised - it will initialise both components, but not actually render it. In my case, the problem was related with last I'm trying to create a component that has a parameter that defines if some part of template will be rendered. That's not exactly my case. 0 ngIf in child component in Angular. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company It's because *ngIf removes the div element while the condition evaluates to false, it means that the child element doesn't exists inside your component template. I have a parent component which renders its child component conditionally based on ngIf. ngIf not working with ng-template. So it should be condition and also it is used from a child component. I have Validators. the problem is when I click cancel from parent it does not close qr-camera: Can you see the code and suggest if this make makes sense to you and I guess this is a possible duplicate nevertheless you should import. You could instead use the [hidden] directive or [ngClass] or something, This means it cannot read a property called path that you’re trying to probably pass to the child component because it is undefined. <my-child #myChild></my-child> Then you can get the child component like: @ViewChild('myChild') private myChild: MyChildComponent; From that you can call the init() method which has all initialization logic of component. You must not write the {{ }}. Share. Create a common service which has loaderSource as a BehaviourSubject and inject the service into the constructor of your component and subscribe to the loader Observable. Can anybody see why this is not working? Thanks in advance. Angular 5 component shows up / hides even though ngIf is false. changeEvent. Modified 5 years, 11 months ago. This is my main component, consisting of various step (I showed only 2 in code for brevity) with a button for forward navigation and a button to reset the component returning on first step. You signed in with another tab or window. Here are my codes: Parent Html: Parent->First component->Second component->Table component. However, even If the child component/table is conditionally shown using ngif, you're going to run into undefined errors -- because when ngif resolves to false, the element does not exist. service. I want an ngIf check to show/build or hide/don't build child component no matter what the component is built even when not displayed (not in dom). ngif not working in one method. I have a parent component that will change the child's form that is passed as @Input() when a button is clicked. Change static to false, when you use view child to access an element that is conditionally rendered using ngIf. The quick correct solution is to not define showIt directly on your scope, but instead place it in an object (e. 4. querySelector("div#test") it just comes back null. What that means is that the ChangeDetector will only run when (a) an HTML event is fired inside the component, e. The main idea is to destroy the child component and create it again afterwards, which you can do with a simple *ngIf flag on the child component. Here’s a brief explanation of how to use @ContentChild and I'm new at angular2 and not professional. I have a child component, which is loaded inside a parent component, but child is conditional and restricted loading with *ngIf condition <app-child *ngIf="showChild"><app-child> I have a common service, where there is a subject I`m subscribing in multiple places, but when child component is loaded later with showChild=true, the subscription You can use an Output variable in child component to pass data to parent. I am using the greensock animation library to animate some components (as you would expect). I have a component with 2 zones and in theses zones I have a tags. pznz lwxyc tfgo pukk mztdci duqsb boi chtmtom httq ahridg fsxk vwysv okzrh sjedir affsj