8000 fix(forms): provide a method to compare options by DzmitryShylovich · Pull Request #13349 · angular/angular · GitHub
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fix(forms): provide a method to compare options #13349

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DzmitryShylovich
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@DzmitryShylovich DzmitryShylovich commented Dec 9, 2016 •
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Closes #13268 and #13274 / #13828 / #13884 #14121
Usage:

<select [compareWith]="equals"  [(ngModel)]="selectedCountries">
   <option *ngFor="let country of countries" [ngValue]="country">
      {{country.name}}
   </option>
</select>

equals(o1: Country, o2: Country) {
   return o1.id === o2.id;
}

@vicb vicb added area: forms action: review The PR is still awaiting reviews from at least one requested reviewer labels Dec 9, 2016
vicb
vicb reviewed Dec 9, 2016
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modules/@angular/forms/src/directives/select_control_value_accessor.ts
@@ -82,6 +82,8 @@ export class SelectControlValueAccessor implements ControlValueAccessor {
onChange = (_: any) => {};
onTouched = () => {};

@Input() ngEquals: (o1: any, o2: any) => boolean = looseIdentical;
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compareOptions/ equalOptions ?
compare implies 1, 0, -1 return... probably overkill.

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@DzmitryShylovich DzmitryShylovich Dec 9, 2016 •
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compare implies 1, 0, -1 return

yeah, this is why I chose equals. We don't need to sort it.

@vicb
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vicb commented Dec 9, 2016

LGTM, @kara could you please review ?

kara
kara suggested changes Dec 12, 2016
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Can you also add a test for this?

modules/@angular/forms/src/directives/select_control_value_accessor.ts
@@ -82,6 +82,8 @@ export class SelectControlValueAccessor implements ControlValueAccessor {
onChange = (_: any) => {};
onTouched = () => {};

@Input() equalOptions: (o1: any, o2: any) => boolean = looseIdentical;
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Hmm, I like the idea of an optional equality method, but I don't think this name is very intuitive. Perhaps compareWith? Discussed with @StephenFluin and we think that might fit the use case better.

<select [compareWith]="compareFn" [(ngModel)]="someProp">
   ...
</select>

@kara kara added action: cleanup The PR is in need of cleanup, either due to needing a rebase or in response to comments from reviews and removed action: review The PR is still awaiting reviews from at least one requested reviewer labels Dec 12, 2016
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@kara ready for review

This was referenced Jan 24, 2017
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@jelbourn jelbourn mentioned this pull request Jan 27, 2017
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kara
kara approved these changes Jan 30, 2017
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LGTM

@kara kara added action: merge The PR is ready for merge by the caretaker and removed action: cleanup The PR is in need of cleanup, either due to needing a rebase or in response to comments from reviews labels Jan 30, 2017
@mhevery mhevery closed this in f89d004 Jan 31, 2017
asnowwolf pushed a commit to asnowwolf/angular that referenced this pull request Aug 11, 2017
fix(forms): provide a method to compare options (angular#13349)
4bd444f 
Closes angular#13268

PR Close angular#13349
8000
juleskremer pushed a commit to juleskremer/angular that referenced this pull request Aug 28, 2017
@juleskremer
fix(forms): provide a method to compare options (angular#13349)
4432324 
Closes angular#13268

PR Close angular#13349
@JosephBL
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JosephBL commented Oct 2, 2017

Is a release date known for this feature? It would help a lot :)

@another-guy
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@JosephBL this feature has been released for many months. (since 4.0.0-beta.6 : https://github.com/angular/angular/blob/master/CHANGELOG.md#400-beta6-2017-02-03 "forms: provide a method to compare options (#13349) (f89d004), closes #13268" )

@JosephBL
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JosephBL commented Oct 9, 2017

Thanks a lot, I somehow missed it :$

@rawatfeb
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Thanks a lot

@chinthu
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chinthu commented Apr 6, 2018

Faced an issue with this compare, if the select is inside the form /formgroup, with name , compare is not working

@marticrespi
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As @chinthu said, if the select is in a form the compare function doesn't work properly.

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@kara kara kara approved these changes

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Provide customizable object comparison method for NgModel
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@DzmitryShylovich @vicb @JosephBL @another-guy @rawatfeb @chinthu @marticrespi @mhevery @kara @googlebot
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