I have 4 checkboxes that filter based on its name/identifierValue. When the page loads ALL should be selected. If I click any other box 'ALL' should deselect and I then filter based on the selection. Then, if I click ALL all of the other checkboxes should deselect but ALL identifiers should show.

Currently, I set the checkboxes to true or false via FormGroup in parent component. I then listen to form changes to hanlde the logic.

The problem is I have to uncheck ALL in order to select another box.

Then when I click ALL after selecting other boxes they deselect properly but all items in the table dont show as expected. After that I have to toggle all of the other boxes just to get the filtering back working again.

Here is the method I'm calling via ngOnInit by way of initializeSearchPage().

handleCheckboxSelection(values: any) {
 const allSelected = values.ALL;
 const checkBox1Selected = values.Checkbox1;
 const checkBox2Selected = values.Checkbox2;
 const checkBox3Selected = values.Checkbox3;

 if (allSelected) {
  // If "All" is selected, deselect others
  this.reportListFG.get('filterGroup')?.patchValue(
    {
      Checkbox1: false,
      Checkbox2: false,
      Checkbox3: false,
    },
    { emitEvent: false } // Prevent infinite loop
  );
  } else {
  // If "All" is not selected, deselect "All" if any other is selected
  if (checkBox1Selected || checkBox2Selected || checkBox3Selected) {
    this.reportListFG.get('filterGroup')?.patchValue(
      {
        ALL: false,
      },
      { emitEvent: false }
    );
  }
  
  

Here is my stackblitz

I have 4 checkboxes that filter based on its name/identifierValue. When the page loads ALL should be selected. If I click any other box 'ALL' should deselect and I then filter based on the selection. Then, if I click ALL all of the other checkboxes should deselect but ALL identifiers should show.

Currently, I set the checkboxes to true or false via FormGroup in parent component. I then listen to form changes to hanlde the logic.

The problem is I have to uncheck ALL in order to select another box.

Then when I click ALL after selecting other boxes they deselect properly but all items in the table dont show as expected. After that I have to toggle all of the other boxes just to get the filtering back working again.

Here is the method I'm calling via ngOnInit by way of initializeSearchPage().

handleCheckboxSelection(values: any) {
 const allSelected = values.ALL;
 const checkBox1Selected = values.Checkbox1;
 const checkBox2Selected = values.Checkbox2;
 const checkBox3Selected = values.Checkbox3;

 if (allSelected) {
  // If "All" is selected, deselect others
  this.reportListFG.get('filterGroup')?.patchValue(
    {
      Checkbox1: false,
      Checkbox2: false,
      Checkbox3: false,
    },
    { emitEvent: false } // Prevent infinite loop
  );
  } else {
  // If "All" is not selected, deselect "All" if any other is selected
  if (checkBox1Selected || checkBox2Selected || checkBox3Selected) {
    this.reportListFG.get('filterGroup')?.patchValue(
      {
        ALL: false,
      },
      { emitEvent: false }
    );
  }
  
  

Here is my stackblitz

• javascript
• angular
• angularjs
• checkbox
• mutual-exclusion

1 Answer 1

Updated

You should compare the current and previous form value with these scenarios:

1. When the "ALL" checkbox is updated and checked, disable other checkboxes.

2. When the other checkbox is updated, uncheck the "ALL" checkbox.

import { pairwise, startWith } from 'rxjs/operators';

this.reportListFG
  .get('filterGroup')
  .valueChanges.pipe(
    startWith(this.reportListFG.get('filterGroup').value),
    pairwise()
  )
  .subscribe(([previousValues, values]) => {
    this.handleCheckboxSelection(previousValues, values);
  });

handleCheckboxSelection(previousValues: any, values: any) {
  const allSelected = values.ALL;
  const checkBox1Selected = values.Checkbox1;
  const checkBox2Selected = values.Checkbox2;
  const checkBox3Selected = values.Checkbox3;
  const isAllSelectedChanged = previousValues?.ALL != values.ALL;
  const checkBox1SelectedChanged =
    previousValues.Checkbox1 != values.Checkbox1;
  const checkBox2SelectedChanged =
    previousValues.Checkbox2 != values.Checkbox2;
  const checkBox3SelectedChanged =
    previousValues.Checkbox3 != values.Checkbox3;

  if (isAllSelectedChanged && allSelected) {
    // If "All" is selected, deselect others
    this.reportListFG.get('filterGroup')?.patchValue(
      {
        Checkbox1: false,
        Checkbox2: false,
        Checkbox3: false,
      },
      { emitEvent: false } // Prevent infinite loop
    );
  } else if (
    checkBox1SelectedChanged ||
    checkBox2SelectedChanged ||
    checkBox3SelectedChanged
  ) {
    // If "All" is not selected, deselect "All" if any other is selected
    this.reportListFG.get('filterGroup')?.patchValue(
      {
        ALL: false,
        Checkbox1: checkBox1Selected,
        Checkbox2: checkBox2Selected,
        Checkbox3: checkBox3Selected,
      },
      { emitEvent: false }
    );

    // Alternate without update whole filterGroup object
    // this.reportListFG.get('filterGroup')
    //   .get("ALL")
    //   .setValue(false, { emitEvent: false });
  }
}

Demo @ StackBlitz