I hope it helps somebody who is trying to match a condition of a property in ngClass.
Angular – How to apply ngStyle conditions
- Sometime, I have to use ‘ChangeDetectorRef’ to refresh ui, then all disabled states work well.
- However, in the following scenarios, it will not fire and you have to take extra actions in order to make it work.
- This time we are given four files instead of the five.
- In Angular 16 even though importing HttpClientModule it can’t resolve the error.
- I was getting errors in the console as well as the compiler and IDE when using the SimpleChanges type in the function signature.
It’s also very cool to see your HTML template markup transformed to javascript instructions that would be very hard to reverse engineer into the original HTML. In older versions it also created gzipped versions for checking their size, and .map sourcemaps files, but this is no longer happening as people kept asking to remove these. I copied this tutorial and extended with some simple gulp tasks for bundling everything to dist folder which can be copied to server and work just like that.
Call child component method from parent class – Angular
Quicker (and dirtier) solution to this would be to set type as any and pass whatever object you want. User ‘s answer is neat and more genericHowever, based on the request by Imad El Hitti, a light weight solution is proposed here. This can be used when a child component is tightly connected to one parent only. A button’sdisabled property is false by default so the button is enabled. Whenyou add the disabled attribute, its presence alone initializes thebutton’s disabled property to true so the button is disabled.
The funny thing is the submit button works just fine and thats the same method… This also performs AoT compilation for even smaller bundles (no Angular compiler, instead, generated compiler output). The bundles are much smaller with AoT if you use Angular 4 as the generated code is smaller.You can test your app with AoT in development mode (sourcemaps, no minification) and AoT by running ng build –aot. Connect and share knowledge within a single location that is structured and easy to search.
If styleOne is true I want a background colour of red. If StyleTwo is true, I want the background colour to be blue. In below example code, the child will be notified each time ‘tellChild()’ is called. This time we are given four files instead of the five. The –prod flag tells Angular to make our application much smaller in size. This seems to be because the Angular compiler will not be shipped with the production builds as the templates are compiled “Ahead of Time”.
- This works since the library defines an input property for passing in a “disabled” value, i.e. @Input(‘disabled’).
- Quicker (and dirtier) solution to this would be to set type as any and pass whatever object you want.
- You can use a similar implementation in other components and all your compoments will share the same shared values.
- If StyleTwo is true, I want the background colour to be blue.
Send data through routing paths in Angular
It could be improved upon by e.g. checking if there actual was a change. You have to import the HttpClientModule, not provide it. So remove it from the provides array and add it to the imports array. I have created a child component which has a method I want to invoke. If you are using bootstrap and apply any background colour using class, just remove it.
Even if they label the old syntax as deprecated, it should still be usable, given the prevalence of applications employing this format. Furthermore, there’s no need to be concerned about migrating from the old syntax to the new one, as you can easily accomplish it by running the following command. By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy. The FormErrorSupportService has a static method that will actually construct the error text based on the error property.
Angular: error NG8001: ‘component’ is not a known element
Using this approach, you can also compare current and previous values of the input that has changed and take actions accordingly. I have angular dynamic locale a parent component (CategoryComponent), a child component (videoListComponent) and an ApiService. I have some inputs (Checkboxes) and I want them to be disabled if my Booleans are true.But its not working…
Show Child Component
I have most of this working fine i.e. each component can access the json api and get its relevant data via observables. In app.config.ts we need to import provideHttpClient() in provider Array. If you need to pass some data, replace void (in EventEmitter) with desired type.
Then anywhere else in the code, this can be referenced as this.categoryId because the getter automatically gets called when referencing that in TypeScript. They are overly-complicated even if they do ultimately work. I just want to add that there is another Lifecycle hook called DoCheck that is useful if the @Input value is not a primitive value. You can use a similar implementation in other components and all your compoments will share the same shared values. In Angular 16 even though importing HttpClientModule it can’t resolve the error. Your selector is ‘app-register’ but you are using ‘register’ .
I have a div that I want to style based on a condition. Sometime, I have to use ‘ChangeDetectorRef’ to refresh ui, then all disabled states work well. At the current version you need to to specify –aot manually, because it can be used in development mode (although that’s not practical due to slowness).
I tried to optimize everything to work well on Jenkis CI, so node_modules can be cached and don’t need to be copied. Basically both suggested solutions work fine in most cases.My main negative experience with ngOnChange() is the lack of type safety. I then implement some custom checking code to decide if I want to update my view with the changed Array. Currently video list component just gets all videos, I would like to filter this to just videos in a particular category, I achieved this by passing the categoryId to the child via @Input().