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feat(forms): clear (remove all) components of a FormArray #28918

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renanmontebelo
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Resolves #18531

PR Checklist

Please check if your PR fulfills the following requirements:

PR Type

What kind of change does this PR introduce?

  • Bugfix
  • Feature
  • Code style update (formatting, local variables)
  • Refactoring (no functional changes, no api changes)
  • Build related changes
  • CI related changes
  • Documentation content changes
  • angular.io application / infrastructure changes
  • Other... Please describe:

What is the current behavior?

To remove all elements we have to loop removing the 1st element until empty:

    while (formArray.length) {
      formArray.removeAt(0);
    }

Issue Number: #18531

What is the new behavior?

formArray.clear();

Might be a little faster as updateValueAndValidity() is called only once instead of for each control being removed.

Does this PR introduce a breaking change?

  • Yes
  • No

Other information

removeAll may be an alternative name if clear is ambiguous (what are we clearing? values? validators?)

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@renanmontebelo renanmontebelo requested a review from a team as a code owner February 22, 2019 05:09
@ngbot ngbot bot added this to the needsTriage milestone Feb 22, 2019
@renanmontebelo renanmontebelo requested a review from a team as a code owner February 23, 2019 01:22
@renanmontebelo renanmontebelo changed the title feat(forms): clear (remove all) elements of a FormArray feat(forms): clear (remove all) components of a FormArray Feb 24, 2019
kara
kara suggested changes Feb 26, 2019
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Thanks for the PR! The change looks good, but needs more docs. Can you also add more information on how to use this new feature to the commit message itself?

@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 target: major This PR is targeted for the next major release labels Feb 26, 2019
@renanmontebelo
feat(forms): clear (remove all) components from a FormArray
6bf3ba8 
This method is a more convenient and efficient way of removing all
components from a FormArray. Before it, we needed to loop the FormArray
removing each component until empty.

Resolves #18531
kara
kara approved these changes Feb 28, 2019
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LGTM. Thanks for updating the docs!

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kara commented Feb 28, 2019 •
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presubmit

@kara kara added action: review The PR is still awaiting reviews from at least one requested reviewer action: presubmit The PR is in need of a google3 presubmit 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 Feb 28, 2019
@kara kara assigned IgorMinar and unassigned renanmontebelo Feb 28, 2019
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kara commented Feb 28, 2019

@IgorMinar Could you take a look at the public API changes?

@nhwaani
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nhwaani commented Mar 6, 2019

This PR would be great feature, it will minimize code base and is much cleaner api for performing the task .👍

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Thanks!

@kara kara added action: merge The PR is ready for merge by the caretaker and removed action: presubmit The PR is in need of a google3 presubmit action: review The PR is still awaiting reviews from at least one requested reviewer labels Mar 8, 2019
@kara kara closed this in a68b1a1 Mar 8, 2019
@renanmontebelo renanmontebelo deleted the formarray-clear branch March 8, 2019 04:10
@renanmontebelo renanmontebelo mentioned this pull request Mar 8, 2019
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wKoza pushed a commit to wKoza/angular that referenced this pull request Apr 17, 2019
@renanmontebelo @wKoza
feat(forms): clear (remove all) components from a FormArray (angular#…
7c055c9 
…28918)

This method is a more convenient and efficient way of removing all
components from a FormArray. Before it, we needed to loop the FormArray
removing each component until empty.

Resolves angular#18531

PR Close angular#28918
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action: merge The PR is ready for merge by the caretaker area: forms cla: yes target: major This PR is targeted for the next major release
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Successfully merging this pull request may close these issues.

Add support for clearing FormArray
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@renanmontebelo @kara @nhwaani @IgorMinar @benlesh @googlebot