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The problem is when I run my app, it works fine. But when I refresh it, most of the time I get below msg.

The selector 'my-app' did not match any elements

But the strange thing is that many times when I refresh my app it works also.

So ultimately I have a strange behavior of my app and unable to figure this out.
Sometimes it works sometimes doesn't..

Any suggestion, can't come up with code???

Note : I don't have complex structure or components yet but simple implementation.

micronyks
micronyksmicronyks
38.4k12 gold badges79 silver badges115 bronze badges

8 Answers

This happened to me because I was importing my code in the head tag, so it was potentially running and attempting to bootstrap before the DOM was ready.

You can either move the script to the bottom of the body tag, or put the bootstrap code within an event listener:

or:

Ed HinchliffeEd Hinchliffe
14.1k7 gold badges37 silver badges64 bronze badges

Angular 4: I had to change <app-root></app-root> with <my-app></my-app> in the index.html file

Mladen RakonjacMladen Rakonjac
5,1614 gold badges25 silver badges40 bronze badges

Things to do:

  1. Go to app.module.ts (to main modules, in most cases this is a name)

  2. Check if you have part 'boostrap:' - if no add:

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    bootstrap: [AppComponent] // where AppComponent is your main component

  3. Check if it works now, if not - go to AppComponent and check your selector. It should be same as tags in body in index.html

so index.html should contain something like this:

where instead of <app-root> you should use selector from main AppComponent

  1. If you are using your angular app in external website then you should consider using defer in headers for angular files
Przemek StrucińskiPrzemek Struciński

I got same issue when I use Angular Universal. But it is because I am using BrowserModule in main.node.ts, the solution is

And check here for more info: https://github.com/angular/universal/issues/542

Hongbo MiaoHongbo Miao
11.7k30 gold badges80 silver badges149 bronze badges

If you are using the angular2 / asp.net core template from here: http://blog.stevensanderson.com/2016/10/04/angular2-template-for-visual-studio/ you might find replacing the last few lines of boot-client.ts with the following helps (and avoids a lot of scary looking console errors when HMR reloads your page):

Ravi DesaiRavi Desai

Maybe you could use the

defer

Tag in your headers js-files.

MadMaxMadMax

I was updating an Angular 5.2 app to Angular 6.1 and run into similar issue. In this case the problem was that index.html file did not have <body> at all. It was instead included in the my-app component.

This used to work with Angular 5.2 (and earlier versions too) because in the generated index.html the script tags were placed at the end. After upgrade to 6.1 the script tags were instead placed in the beginning of the file (and I assume therefore executed before the <my-app></my-app> root element is actually present.

Solution was to move <body> into index.html. (It was originally placed in to the component because someone wanted to apply conditional classes to body element with ngClass.)

Joni NousjärviJoni Nousjärvi

Non of the above answers resolved my issue .This is how solve the same kind of error.You shouldn't have more than one component as Bootstarp component .So, Bootstrap array should have only one component .By mistake I put 4 components in bootstrap array.I removed those 4 components from there and put in entryComponents array(as shown in the code below).This helped me.

DIBYA RANJAN TRIPATHYDIBYA RANJAN TRIPATHY

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