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Row Selection

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ghiscoding edited this page Dec 12, 2022 · 44 revisions
updated doc to 3.x version

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Description

For row selection, you can simply play with couple of grid options (see below) and subscribe to onSelectedRowsChanged (a SlickGrid Event that is, it's not an Observable). However please note that onSelectedRowsChanged is a function available on the Grid object and you will need bind to (gridChanged) to get the object when grid is ready. There are 2 types of row selection(s) which you can do.

Note: enableCheckboxSelector and enableExcelCopyBuffer do not work well together, this is because they both share the same Row.SelectionModel and one cancels the other. It is recommended to not use enableExcelCopyBuffer in that case.

Demo

Demo Page / Demo Component

Single Row Selection

For a single row selection, you need to have enableCellNavigation: true, enableRowSelection: true and multiSelect: false and as described earlier, subscribe to onSelectedRowsChanged (for that you need to bind to (gridChanged)).

Note: if you want to change from Multiple Selections to Single Selection (and vice-versa), you could use the grid options enableCellNavigation flag, however this is not possible when using Inline Editors since this flag is required. However, there is no other known ways of toggling dynamically.

View

<angular-slickgrid gridId="grid4"
      [columnDefinitions]="columnDefinitions"
      [gridOptions]="gridOptions"
      [dataset]="dataset"
      (onSelectedRowsChanged)="onSelectedRowsChanged($event.detail.eventData, $event.detail.args)">
</angular-slickgrid>

Component

this.gridOptions = {
  enableAutoResize: true,
  enableCellNavigation: true,
  enableCheckboxSelector: true,
  enableRowSelection: true,
  multiSelect: false,
}

onSelectedRowsChanged(e, args) {
  if (Array.isArray(args.rows)) {
    this.selectedObjects = args.rows.map(idx => {
      const item = grid.getDataItem(idx);
      return item.title || '';
    });
  }
}

Multiple Row Selections

As for multiple row selections, you need to provide an extra grid option of rowSelectionOptions which is an object and within it, you need to disable the selectActiveRow flag. The other configurations are the same as a Single Selection, which is to enable enableCheckboxSelector and enableRowSelection. Then as describe earlier, you will subscribe to onSelectedRowsChanged (for that you need to bind to (gridChanged)).

View

<angular-slickgrid gridId="grid4"
      [columnDefinitions]="columnDefinitions"
      [gridOptions]="gridOptions"
      [dataset]="dataset"
      (onSelectedRowsChanged)="onSelectedRowsChanged($event.detail.eventData, $event.detail.args)">
</angular-slickgrid>

Component

export class Example1 implements OnInit {
  ngOnInit() {
    this.gridOptions = {
      enableAutoResize: true,
      enableCellNavigation: true,
      enableCheckboxSelector: true,
      enableRowSelection: true,
      rowSelectionOptions: {
        // True (Single Selection), False (Multiple Selections)
        selectActiveRow: false
      },
    }
  }

  onSelectedRowsChanged(e, args) {
    if (Array.isArray(args.rows)) {
      // user clicked on the 1st column, multiple checkbox selection
      console.log('multiple row checkbox selected', event, args);
    }
  }

Changing Dynamically from Single to Multiple Selections (and vice-versa)

If you want to change from Multiple Selections to Single Selection (and vice-versa), you could toggle the grid options enableCellNavigation flag (False when you want Single Selection), however this is not possible when using Inline Editors since this flag is required. Note that there is currently no other ways of toggling dynamically without re-creating the grid.

Mixing Single & Multiple Row Selections

SlickGrid is so powerful and customizable, you could if you wish mix the multiple row selections (cell column 1) and single row selection (any other cell click). For that though, you will need to use 2 SlickGrid Events (onClick and onSelectedRowsChanged). For example we can do it this way:

View

<angular-slickgrid gridId="grid4"
      [columnDefinitions]="columnDefinitions"
      [gridOptions]="gridOptions"
      [dataset]="dataset"
      (onSelectedRowsChanged)="onSelectedRowsChanged($event.detail.eventData, $event.detail.args)"
      (onClick)="onCellClicked($event.detail.eventData, $event.detail.args)">
</angular-slickgrid>

Component

export class Example1 implements OnInit {
  onSelectedRowsChanged(e, args) {
    // user clicked on the 1st column, multiple checkbox selection
    console.log('multiple row checkbox selected', event, args);
  }

  onCellClicked(e, args) {
    // when clicking on any cell, we will make it the new selected row
    // however, we don't want to interfere with multiple row selection checkbox which is on 1st column cell
    if (args.cell !== 0) {
      grid.setSelectedRows([args.row]);
    }
  }
}

Disable Custom Rows Selections via selectableOverride

You can use selectableOverride to provide custom logic to disable certain rows selections, for example the code below will remove the row selection on every second row.

Component

export class Example1 implements OnInit {
  prepareGrid() {
    this.gridOptions = {
      enableRowSelection: true,
      enableCheckboxSelector: true,
      checkboxSelector: {
        // you can override the logic for showing (or not) the expand icon
        // for example, display the expand icon only on every 2nd row
        selectableOverride: (row: number, dataContext: any, grid: any) => (dataContext.id % 2 === 1)
      },
      multiSelect: false,
      rowSelectionOptions: {
        // True (Single Selection), False (Multiple Selections)
        selectActiveRow: true,
      },
    };
  }
}

Disable External Button when having Empty Selection

When having an external button that you want to work only when there's row selection, there are 2 ways of doing this.

  1. use the onSelectedRowsChanged event (via your View in HTML or via ViewModel)
<button disabled.bind="isMyButtonDisabled">My Button</button>
<angular-slickgrid gridId="grid2"
          [columnDefinitions]="columnDefinitions"
          [gridOptions]="gridOptions"
          [dataset]="dataset"
          (onSelectedRowsChanged)="handleOnSelectedRowsChanged($event.detail.args)">
</angular-slickgrid>
isMyButtonDisabled = false;

handleOnSelectedRowsChanged(args) {
  this.isMyButtonDisabled = args?.rows?.length === 0;
}
  1. use the onGridStateChanged event (see Grid State & Presets Wiki)
<button disabled.bind="isMyButtonDisabled">My Button</button>
<angular-slickgrid gridId="grid2"
          [columnDefinitions]="columnDefinitions"
          [gridOptions]="gridOptions"
          [dataset]="dataset"
          (onGridStateServiceChanged)="handleOngridStateChanged($event.detail.args)">
</angular-slickgrid>
isMyButtonDisabled = false;

handleOngridStateChanged(gridState) {
  if (Array.isArray(gridState?.rowSelection.dataContextIds)) {
    this.isMassSelectionDisabled = gridState.rowSelection.dataContextIds.length === 0;
  }
}

Change Row Selections

You can change which row(s) are selected by using the built-in SlickGrid method setSelectedRows(rowIndexes) (passing an empty array will clear all selection), however please note that it requires an array of row indexes as you see them in the UI and it won't work that great with Pagination (if that is what you are looking for then take a look at this Stack Overflow Q&A)

<angular-slickgrid gridId="grid2"
          [columnDefinitions]="columnDefinitions"
          [gridOptions]="gridOptions"
          [dataset]="dataset"
          (onAngularGridCreated)="angularGridReady($event.detail)">
</angular-slickgrid>
export class Example1 {
  angularGrid: AngularGridInstance;

  angularGridReady(angularGrid: AngularGridInstance) {
    this.angularGrid = angularGrid;
    this.gridObj = angularGrid.slickGrid;
  }

  changeRowSelections() {
    this.angularGrid.slickGrid.setSelectedRows(rowIndexes); 

    // OR providing an empty array will clear the row selection
    // this.angularGrid.slickGrid.setSelectedRows([]); 
  }
}

Troubleshooting

Adding a Column dynamically is removing the Row Selection, why is that?

The reason is because the Row Selection (checkbox) plugin is a special column and Angular-Slickgrid is adding an extra column dynamically for the Row Selection checkbox and that is not reflected in your local copy of columnDefinitions. To address this issue, you need to get the Angular-Slickgrid internal copy of all columns (including the extra columns), you can get it via getAllColumnDefinitions() from the Grid Service and then you can use to that array and that will work.

<angular-slickgrid gridId="grid17"
    [columnDefinitions]="columnDefinitions"
    [gridOptions]="gridOptions"
    [dataset]="dataset"
    (onAngularGridCreated)="angularGridReady($event.detail)">
</angular-slickgrid>
angularGridReady(angularGrid: AngularGridInstance) {
  this.angularGrid = angularGrid;
}

addNewColumn() {
  const newColumn = { /*...*/ };

  const allColumns = this.angularGrid.gridService.getAllColumnDefinitions();
  allColumns.push(newColumn);
  this.columnDefinitions = allColumns.slice(); // or use spread operator [...cols]

  // you could also use SlickGrid setColumns() method
  // this.angularGrid.slickGrid.setColumns(cols);
}
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