Selección de celdas Angular

    The selection feature enables rich data select capabilities in the Material UI based Hierarchical Grid. Variety of events and single select actions are available thanks to the powerful API and easy to use methods. The Hierarchical Grid now supports three modes for cell selection, and you can easily switch between them by changing cellSelection property. You can disable cell selection, you can select only one cell within the grid or to select multiple cells in the grid, which is provided as default option. In the Hierarchical Grid you can specify the cell selection mode on grid level. So for example in the parent grid multi-cell selection can be enabled, but in child grids cell selection mode can be single or disabled. But let's dive deeper in each of these options.

    Angular Cell Selection Example

    El siguiente ejemplo demuestra los tres tipos de comportamiento de selección de celdas de Hierarchical Grid. Utilice los botones a continuación para habilitar cada uno de los modos de selección disponibles. Se proporcionará una breve descripción de cada interacción de botón a través de un cuadro de mensaje de snackbar.

    Selection types

    Hierarchical Grid Multiple-cell Selection

    Este es el modo de selección de celda predeterminado tanto en la cuadrícula principal como en la secundaria. Tenga en cuenta que puede realizar la selección de celdas en una cuadrícula a la vez, no puede realizar una selección de rango cruzado de cuadrículas ni tener celdas seleccionadas en varias cuadrículas. Cada combinación de teclas relacionada con la selección de rango y la funcionalidad de arrastre del mouse solo se puede usar en la misma cuadrícula.

    Cómo seleccionar celdas:

    • By Mouse drag - Rectangular data selection of cells would be performed.
    • By Ctrl key press + Mouse drag - Multiple range selections would be performed. Any other existing cell selection will be persisted.
    • Instant multi-cell selection by using Shift key. Select single cell and select another single cell by holding the Shift key. Cell range between the two cells will be selected. Keep in mind that if another second cell is selected while holding Shift key the cell selection range will be updated based on the first selected cell position (starting point).
    • Keyboard multi-cell selection by using the Arrow keys while holding Shift key. Multi-cell selection range will be created based on the focused cell.
    • Keyboard multi-cell selection by using the Ctrl + Arrow keys and Ctrl + Home/End while holding Shift key. Multi-cell selection range will be created based on the focused cell.
    • Clicking with the Left Mouse key while holding Ctrl key will add single cell ranges into the selected cells collection.
    • La selección continua de múltiples celdas está disponible haciendo clic con el mouse y arrastrando.

    Hierarchical Grid Single Selection

    When you set the [cellSelection]="'single'", this allows you to have only one selected cell in the grid at a time. Also the mode mouse drag will not work and instead of selecting a cell, this will make default text selection.

    Note

    When single cell is selected selected event is emitted, no matter if the selection mode is single or multiple. In multi-cell selection mode when you select a range of cells rangeSelected event is emitted.

    Hierarchical Grid None selection

    If you want to disable cell selection you can just set [cellSelection]="'none'" property. In this mode when you click over the cell or try to navigate with keyboard, the cell is not selected, only the activation style is applied and it is going to be lost when you scroll or click over other element on the page. The only way for you to define selection is by using the API methods that are described below.

    Estilismo

    El motor del tema expone propiedades que nos permiten estilizar el rango de celdas seleccionadas.

    Import theme

    To get started with styling the selection, we need to import the index file, where all the theme functions and component mixins live:

    @use "igniteui-angular/theming" as *;

// IMPORTANT: Prior to Ignite UI for Angular version 13 use:
// @import '~igniteui-angular/lib/core/styles/themes/index';

    Define colors

    Once done, we can make use of the contrast-color and color functions. With them, we define the colors we would like to use for our selection range:

    $text-color: contrast-color($color: 'primary', $variant: 900);
$background-color: color($color: "primary", $variant: 900);
$border-yellow: #f2c43c;
    Note

    If we don't want to use the contrast-color and color functions, we can always hardcode the color values.

    Create custom theme

    Next we create a new theme that extends the grid-theme passing our text-color, background-color and border-yellow variables as $cell-selected-text-color, $cell-selected-background and $cell-active-border-color, respectively:

    $custom-grid-theme: grid-theme(
  $cell-selected-text-color: $text-color,
  $cell-active-border-color: $border-yellow,
  $cell-selected-background: $background-color
);

    Apply theme

    Después, todo lo que tenemos que hacer es incluir el mixin en el estilo de nuestro componente (también podría estar en los estilos de la aplicación), para que nuestro igx-hierarchical-grid use el tema recién creado en lugar del predeterminado:

    @include css-vars($custom-grid-theme);

    Con el tema personalizado aplicado, las celdas de la cuadrícula seleccionadas se resaltan con nuestros colores seleccionados:

    Demo

    Note

    La muestra no se verá afectada por el tema global seleccionado deChange Theme.

    API References

    Additional Resources

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