'Angular 7 error RangeError: Maximum call stack size exceeded

I am trying to learn angular by following the official tutorial but when following steps for hero component and hero detail component, it raises an error "RangeError: Maximum call stack size exceeded".

The hero.component.html:

<ul class="heroes">
  <li *ngFor="let hero of heroes" (click)="onSelect(hero)" [class.selected]="hero === selectedHero">
    <span class="badge">{{hero.id}}</span> {{hero.name}}
  </li>
</ul>

<!-- 
<app-hero-detail [hero]="selectedHero"></app-hero-detail> -->


<app-heroes></app-heroes>

The detail component:

<div *ngIf="hero">

  <h2>{{hero.name}} Details</h2>
  <div><span>id: </span>{{hero.id}}</div>
  <div>
    <label>name:
      <input [(ngModel)]="hero.name" placeholder="name"/>
    </label>
  </div>

</div>

<app-hero-detail [hero]="selectedHero"></app-hero-detail>

The hero component

import { Component, OnInit } from '@angular/core';
import { Hero } from '../hero';
import { HEROES } from '../mock-heroes';
import { HeroService } from '../hero.service';

@Component({
  selector: 'app-heroes',
  templateUrl: './heroes.component.html',
  styleUrls: ['./heroes.component.css']
})
export class HeroesComponent implements OnInit {
  heroes: Hero[];

  selectedHero: Hero;

  constructor(private heroService: HeroService) { }

  ngOnInit() {
    this.getHeroes();
  }

  getHeroes(): void {
    this.heroes = this.heroService.getHeroes();
  }

  onSelect(hero: Hero): void {
    this.selectedHero = hero;
  }

}

The hero.detail component

import { Component, OnInit, Input } from '@angular/core';
import { Hero } from '../hero';

@Component({
  selector: 'app-hero-detail',
  templateUrl: './hero-detail.component.html',
  styleUrls: ['./hero-detail.component.css']
})
export class HeroDetailComponent implements OnInit {

  @Input() hero: Hero;
  constructor() { }

  ngOnInit() {
  }

}

one thing to mention is that when <app-heroes></app-heroes> is commented, the list page is loaded without an error

any help is appreciated

angular angular7

Solution 1:^[1]

1.This error occur when there is an infinite loop. As you have mentioned that the page loads when app-heroes is commented, this might be used as selector-name for more than one component which is not allowed. This can cause an infinite loop and fail to load components.

Try making below edits,

hero.component.html

<ul class="heroes">
  <li *ngFor="let hero of heroes" (click)="onSelect(hero)" [class.selected]="hero === selectedHero">
    <span class="badge">{{hero.id}}</span> {{hero.name}}
  </li>
</ul>

<app-hero-detail [hero]="selectedhero"></app-hero-detail>

hero.detail.component.html

<div *ngIf="hero">
  <h2>{{hero.name}} Details</h2>
  <div><span>id: </span>{{hero.id}}</div>
  <div>
    <label>name:
      <input [(ngModel)]="hero.name" placeholder="name"/>
    </label>
  </div>
</div>

Hope this helps.

Solution 2:^[2]

In your example you render component inside yourself, so you never finish this operation and all time render another child component (if second part of block is

Update - more details:

If you write app with components, all components are hierarchical, so you can include the same component inside yourself only if you are sure, that this is limited amount of loop inside. In your code example you has unlimited nested components, because child component generate next child component inside yourself body. In result your browser display error: RangeError: Maximum call stack size exceeded

hero.component.html

<ul class="heroes">
  <li *ngFor="let hero of heroes" (click)="onSelect(hero)" [class.selected]="hero === selectedHero">
    <span class="badge">{{hero.id}}</span> {{hero.name}}
  </li>
</ul>

<!-- 
<app-hero-detail [hero]="selectedHero"></app-hero-detail> -->


<app-heroes></app-heroes>

app-hero-details.component.html

<div *ngIf="hero">

  <h2>{{hero.name}} Details</h2>
  <div><span>id: </span>{{hero.id}}</div>
  <div>
    <label>name:
      <input [(ngModel)]="hero.name" placeholder="name"/>
    </label>
  </div>

</div>

// you should comment line below
// <app-hero-detail [hero]="selectedHero"></app-hero-detail>

Solution 3:^[3]

I will add an answer that describes a different cause for this error when upgrading to angular 8 an existing application and using new routing features.

In my case, I added to each lazy loaded route the data object with preload set to true || false using the new syntax:

  {
    path: '',
    loadChildren: () => import('./views/home/home.module').then(mod => mod.HomeModule),
    data: { preload: true }
  },

However it took me a while to realize that I had left the preloadingStrategy set to PreloadAllModules in my RouterModule forRoot declaration:

@NgModule({
  imports: [RouterModule.forRoot(
    routes,
    {
      preloadingStrategy: PreloadAllModules, <-- This is the cause
    })],
    ...

Removing preloadingStrategy from the module forRoot declaration and relying on the route data preload definitio fixes the issue.

Solution 4:^[4]

You have the <app-hero-detail> displayed inside the details HTML.

<app-hero-detail [hero]="selectedHero"></app-hero-detail>

Please try removing this. A similar line is commented in the hero.component.html, you can uncomment that.

Solution 5:^[5]

I was dealing with this error when my intellisense accidentally added the module name (instead of a specific component name) to the exports for the module:

@NgModule({
  declarations: [
    FooComponent,
    // ...
  ],
  imports: [CommonModule],
  exports: [
    FooModule, // <== should be 'FooComponent'
    // ...
  ], 
})
export class FooModule {}

It definitely would be nice if the error was a little more descriptive though, as this tool me some time

Solution 6:^[6]

This error occurred when I used a circular module import mistakenly on Angular 9.

import {NgModule} from '@angular/core';
import {CommonModule} from '@angular/common';
@NgModule({
 imports: [
    CommonModule,
    ModuleTwo
  ],
 
})
export class ModuleOne {
}

and

import {NgModule} from '@angular/core';
import {CommonModule} from '@angular/common';
    @NgModule({
    imports: [
        CommonModule,
        ModuleOne
      ],
     
    })
    export class ModuleTwo {
    }

Solution 7:^[7]

A different cause for this error when upgrading to angular 8 an existing application and using new routing features in separate file.

In my case not importing the featureRouterModule to its particular featureModule.ts cause maximum stack exceed error.Since angular can't find its particular router file registered

Solution 8:^[8]

I was able to reproduce this error message when I created a module and I forget to add the RoutingModule.

@NgModule({
  declarations: [
  SuccessComponent,
  CheckoutComponent
],
  imports: [
    ShareModule,
    PaymentRoutingModule // Forget to add it.
  ]
})
export class PaymentModule { }

I have no idea why I got this error, but maybe another person can make the same mistake.

Solution 9:^[9]

I named two modules similarly and didn't pay attention to which I imported. If you import a module inside itself it will cause circular import till maximum call stack is reached.

Solution 10:^[10]

Possible cases for this error which I found:

2 or more modules with the same name
Wrong imports in your app.module.ts file
Problem with compilation

Solution that you can try:

for point 1, change the names and make them unique
for point 2, make sure all imports are intended as per your use case for a module, do check for inter-dependency between modules
for point 3, rare but happens if browser doesn't have enough memory to process, so try to restart your code editor, browser or your PC.

Solution 11:^[11]

This happened when I was subscribing to an observable more frequently than required. I was subscribing to the below observable on every Enter key press,

this.filteredOptions.subscribe((res) => this.addSelectedContacts(event, res[keyManager.activeItemIndex]))

This was obviously not required, I had to limit the observable to only get the first emission by adding pipe(take(1)) as,

this.filteredOptions.pipe(take(1)).subscribe((res) => this.addSelectedContacts(event, res[keyManager.activeItemIndex]))

You might also use the swithMap operator syntax to dismiss previous subscriptions.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1
Solution 2
Solution 3
Solution 4	Sachin Gupta
Solution 5	Kurtis Jungersen
Solution 6	Eyayu Tefera
Solution 7	Nambi N Rajan
Solution 8	AFetter
Solution 9	Omar Iriskic
Solution 10	saberprashant
Solution 11	drac_o

'Angular 7 error RangeError: Maximum call stack size exceeded

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