Managing form input in Ionic2 components from external sources in Angular2

Question

Managing form input in Ionic2 components from external sources in Angular2

Hello there, I am currently facing an issue with managing form validation along with proper styling for nested forms. Here's what I'm aiming to achieve: I have a Page that displays Tabs components with four tabs. Each tab represents a separate @Page. The specific page I am working on contains a list of components (ItemListCmp). Each component (referred to as ItemCmp) within the list has its own form. I need these forms to be validated and if they are in an invalid state, I want to modify the styling of the corresponding ItemCmp. Additionally, the ItemListCmp itself has a form that encompasses all the ItemCmp components, and it also needs to be informed when the status of any of the inner forms changes.

Could you provide assistance with this matter or direct me to any relevant resources? Thank you.

https://i.stack.imgur.com/v4yaB.png

typescript angular ionic2

Answer 1

Answer №1

To enhance the functionality of ItemListCmp and ItemCmp, I propose creating components that are compatible with ngForm and ngControl. This would allow you to utilize their status using the valid property and implement validation as needed. By incorporating each component as a control within the form at different levels, you can streamline the overall structure.

If you're interested in implementing this approach effectively, check out the "NgModel-compatible component" section in the following article:

For more insights on custom form inputs in Angular 2, you may find the following question helpful:

Angular 2 custom form input

Answer 2

To enhance the functionality of ItemListCmp and ItemCmp, I propose creating components that are compatible with ngForm and ngControl. This would allow you to utilize their status using the valid property and implement validation as needed. By incorporating each component as a control within the form at different levels, you can streamline the overall structure.

If you're interested in implementing this approach effectively, check out the "NgModel-compatible component" section in the following article:

For more insights on custom form inputs in Angular 2, you may find the following question helpful:

Angular 2 custom form input

Answer 3

Answer №2

I managed to achieve this functionality using the @ViewChildren decorator. Essentially, within my ItemListCmp component, I am dynamically creating a form (without using the "form" HTML tag) in the AfterViewInit lifecycle hook.

// Within the ItemListCmp class
@ViewChildren(ItemCmp) itemCmps: QueryList<ItemCmp>;

ngAfterViewInit() {
const iCmps = this.itemCmps.toArray();
iCmps.map((c: ItemCmp, key: number) => {
  this.listForm.addControl(key.toString(), c.itemForm);
});
this.listForm.statusChanges
  .debounce(() => Observable.timer(800))
  .distinctUntilChanged()
  .subscribe((status: string) => {
  if (status === 'VALID') {
    this.onStatusChanged.emit(1);
  } else {
    this.onStatusChanged.emit(0);
  }
});
}

was a valuable resource for me during this process

Answer 4

I managed to achieve this functionality using the @ViewChildren decorator. Essentially, within my ItemListCmp component, I am dynamically creating a form (without using the "form" HTML tag) in the AfterViewInit lifecycle hook.

// Within the ItemListCmp class
@ViewChildren(ItemCmp) itemCmps: QueryList<ItemCmp>;

ngAfterViewInit() {
const iCmps = this.itemCmps.toArray();
iCmps.map((c: ItemCmp, key: number) => {
  this.listForm.addControl(key.toString(), c.itemForm);
});
this.listForm.statusChanges
  .debounce(() => Observable.timer(800))
  .distinctUntilChanged()
  .subscribe((status: string) => {
  if (status === 'VALID') {
    this.onStatusChanged.emit(1);
  } else {
    this.onStatusChanged.emit(0);
  }
});
}

was a valuable resource for me during this process

Managing form input in Ionic2 components from external sources in Angular2

Answer №1

Answer №2

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