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columns

Description​

Optional. An array of objects with configuration parameters for columns in the grid area

Usage​

columns?: false | {
  id?: string;
  width?: number;
  align?: "left" | "right" | "center";
  flexgrow?: number;
  resize?: boolean;
  sort?: boolean;

  header?: string | IHeaderCellConfig | (string | IHeaderCellConfig)[];
  footer?: string | IHeaderCellConfig | (string | IHeaderCellConfig)[];
  cell?: Component<ICellProps>;
  template?: (value: any, row: IRow, col: IColumn) => string;
  editor?: TEditorType | IColumnEditorConfig | TEditorHandlerConfig;
  options?: IOption[];
}[];

Expanded signature:

columns?: false | {
  // column id
  id?: string;

  // width of the column
  width?: number | string; // CSS width (default "120px")

  // text alignment
  align?: "left" | "right" | "center"; // default "left"

  // flex grow factor 
  flexgrow?: number;

  // enable/disable resize by drag handle
  resize?: boolean; // default true

  // enable/disable sorting
  sort?: boolean; // default true

  // header configuration
  header?: 
    | string 
    | {                  
      // IHeaderCellConfig
      id?: string;
      text?: string;
      cell?: any;
      css?: string;
      rowspan?: number;
      colspan?: number;
      collapsible?: boolean | "first" | "header";
      collapsed?: boolean;
    }
    | (string | {
      id?: string;
      text?: string;
      cell?: any;
      css?: string;
      rowspan?: number;
      colspan?: number;
      collapsible?: boolean | "first" | "header";
      collapsed?: boolean;
    })[];

  // footer (same as header)
  footer?: 
    | string 
    | {
      id?: string;
      text?: string;
      cell?: any;
      css?: string;
      rowspan?: number;
      colspan?: number;
      collapsible?: boolean | "first" | "header";
      collapsed?: boolean;
    }
    | (string | {
      id?: string;
      text?: string;
      cell?: any;
      css?: string;
      rowspan?: number;
      colspan?: number;
      collapsible?: boolean | "first" | "header";
      collapsed?: boolean;
    })[];

  // template function for cell rendering
  template?: (value: any, row: IRow, col: IColumn) => string;

  // custom Svelte component for cell rendering
  cell?: Component<{
    api: IApi;
    row: IRow;
    column: IColumn;
    onaction: (ev: { action?: any; data?: { [key: string]: any } }) => void;
  }>;

  // editor configuration
  // IColumnEditorConfig | TEditorHandlerConfig | TEditorType
  editor?: 
    | "text"
    | "combo"
    | "datepicker"
    | "richselect"
    | {
      type: "text" | "combo" | "datepicker" | "richselect";
      config?: {
        template?: (v: any) => string;
        cell?: any | Component<{
          data: any;
          onaction: (ev: {
            action?: any;
            data?: { [key: string]: any };
          }) => void;
        }>;
        options?: { id: string | number; label: string }[];
        buttons?: ("clear" | "today")[];
      };
    }
    | ((
      row?: IRow,
      column?: IColumn
    ) => "text" | "combo" | "datepicker" | "richselect" | {
      type: "text" | "combo" | "datepicker" | "richselect";
      config?: {
        template?: (v: any) => string;
        cell?: any | Component<{
          data: any;
          onaction: (ev: {
            action?: any;
            data?: { [key: string]: any };
          }) => void;
        }>;
        options?: { id: string | number; label: string }[];
        buttons?: ("clear" | "today")[];
      };
    } | null);

  // predefined options for editors (combo, richselect)
  // IOption
  options?: { id: string | number; label: string }[];
}[];

Parameters​

  • flexgrow (optional) specifies how much space (width) relative to the grid width the column will take (it will take no effect on columns with the set width); the property is specified as a number (if flexgrow is set to 1 in one column only, the column will take the full available width)
  • width - (optional) the column width value from here; the default value is "120px"
  • align - (optional) the text align value from here; the default value is "left"
  • resize - (optional) enables ("true" - default) or disables ("false") a drag handle for column resizing
  • header - (optional) IColumnHeader object can be one of the following:
    • string - a plain text label for the column header
    • IHeaderCell – an object with the following parameters:
      • id?: string – identifier of the header cell (useful for referencing or merging)
      • text?: string – the text displayed in the header cell
      • cell?: any – a custom cell renderer or configuration object
      • css?: string – CSS class name(s) applied to the header cell
      • rowspan?: number – number of rows the header cell should span
      • colspan?: number – number of columns the header cell should span
      • collapsible?: boolean | "first" | "header" – whether the header group can be collapsed
      • collapsed?: boolean – defines whether the header is initially collapsed
    • (string | IHeaderCell)[] - an array of either plain strings or header cell objects, useful for creating multi-row headers
  • sort - (optional) if set to true (default), enables sorting in a column; if false, the sorting is disabled
  • template?: (value: any, row: IRow, col: IColumn) => string; - (optional) applies a template to a column;
    • value – the value of the current cell
    • row – the row object of type IRow
    • col – the column object of type IColumn
  • cell - (optional) the name of a custom Svelte component to be applied inside a cell; e.g., cell: CheckboxCell
  • editor – (optional) enables inline editing in a grid column cell.
    It can be either:
    • a string with the editor type (one of: "text" | "combo" | "datepicker" | "richselect"), or
    • an object with the following parameters:
      • type (string) – the editor type
      • config (optional) – an object with editor configuration settings (for all editor types except "text"):
        • cell – (optional) a custom component used inside the editor
        • template – (optional) a function that takes an option value and returns a string to display: template?: (v: any) => string;
        • options – (optional) an array of selectable options for "combo" or "richselect" editors
        • buttons – (optional) an array of extra buttons, e.g. ["clear" | "today"] (used in "datepicker")
  • options - (optional) property provides the list of selectable values for editors like "combo" or "richselect". Each option object has the following structure:
    • id: string|number – unique identifier of the option
    • label: string – display text for the option

The columns property can be set to false to hide the tasks tree area.

Default config​

[
   { id: "text", header: "Task name", flexgrow: 1, sort: true },
   { id: "start", header: "Start date", align: "center", sort: true },
   { id: "duration", header: "Duration", width: 90, align: "center", sort: true },
   { id: "add-task", header: "", width: 50, align: "center" },
];

Example​

<script>
  import { getData } from "./common/data";
  import { Gantt } from "@svar-ui/svelte-gantt";

  const data = getData();

  const columns = [
   { id: "text", header: "Task name", flexgrow: 2 },
   {
    id: "start",
    header: "Start date",
    flexgrow: 1,
    align: "center",
   },
   {
    id: "duration",
    header: "Duration",
    align: "center",
    flexgrow: 1,
   },
   {
    id: "add-task",
    header: "",
    width: 50,
    align: "center",
   },
  ];
</script>

<Gantt tasks={data.tasks} links={data.links} scales={data.scales} {columns} />

In the next example the area with tasks tree is hidden by setting columns to false:

<script>
  import { getData } from "./common/data";
  import { Gantt } from "@svar-ui/svelte-gantt";

  const data = getData();

</script>

<Gantt
   tasks={data.tasks}
   links={data.links}
   scales={data.scales}
   columns={false} />