ProseMirror table module with sections

This module defines a schema extension to support tables with table caption, head, bodies and foot, rowspan/colspan support, a custom selection class for cell selections in such a table, a plugin to manage such selections and enforce invariants on such tables, and a number of commands to work with tables.

It's a fork of prosemirror-tables.

The goal of this module is a Prosemirror Node rendering the tables of Pandoc's internal model, but it's generic enough to support any table with an optional caption, an optional head (thead), one or more table bodies (tbody) and an optional foot (tfoot).

It defines four additional table roles: head, body, foot and caption. The first three are "section roles".

The top-level directory contains a demo.js and index.html, which can be built with npm run build_demo or yarn build_demo to show a simple demo of how the module can be used.

Version

This is version 0.6.1.

It adds two commands:

• setComputedStyleColumnWidths, that sets the cells widths of a table to the actual values you may have set with CSS. It uses window.getComputedStyle to retrieve those widths. If there's a column selection, it sets the widths of the selected columns' cells only, otherwise it sets all the cells widths of the (inner) table in the selection.

• setRelativeColumnWidths(widths: number[], minwidth?: number), that returns a Command to set the relative widths of the (inner) table in the selection. The relative widths must be in the range 0..1.

  The table width is the one obtained with window.getComputedStyle. The new cells will get a col width = rel width * table width.

  If you specify minwidth, the columns will not be narrower than that.

  If widths.length is greater than the number of columns, the exceeding widths will be ignored.

  If widths.length is lesser than the number of columns, only the first column widths will be set.

The code of this version has been checked with the current version of prosemirror-tables (resulting in a bug being fixed).

Since version 0.6.0 the code goes back to the implementation of columnresizing.ts and tableview.ts you find in the original prosemirror-tables, adapted to table sections.

BTW, thanks to the people maintaining the original project, in particular for the translation into Typescript, that let me go back to the original implementation of column resizing.

Known issues

When you copy a portion of a table and you paste, you'll get a table with all the cells you copied, but they will be all in a table foot.

Anyway, you can correct it into a table body with the makeBody command.

Documentation

The module's main file exports everything you need to work with it. The first thing you'll probably want to do is create a table-enabled schema. That's what tableNodes is for:

• tableNodes(options: TableNodesOptions) → TableNodes
  This function creates a set of node specs for table, table_caption, table_head, table_body, table_foot, table_row, table_cell and table_header nodes types as used by this module. The result can then be added to the set of nodes when creating a schema.

• tableEditing(TableEditingOptions = {}) → Plugin
  Creates a plugin that, when added to an editor, enables cell-selection, handles cell-based copy/paste, and makes sure tables stay well-formed (each row has the same width, and cells don't overlap).

  You should probably put this plugin near the end of your array of plugins, since it handles mouse and arrow key events in tables rather broadly, and other plugins, like the gap cursor or the column-width dragging plugin, might want to get a turn first to perform more specific behavior.

class CellSelection extends Selection

A Selection subclass that represents a cell selection spanning part of a table. With the plugin enabled, these will be created when the user selects across cells, and will be drawn by giving selected cells a selectedCell CSS class.

• new CellSelection($anchorCell: ResolvedPos, $headCell?: ResolvedPos = $anchorCell)

• $anchorCell: ResolvedPos

• $headCell: ResolvedPos

• forEachCell(f: fn(node: Node, pos: number))

• isColSelection(tableMap?: TableMap) → boolean

• isRowSelection() → boolean

• static colSelection($anchorCell: ResolvedPos, $headCell?: ResolvedPos = $anchorCell) → CellSelection

• static rowSelection($anchorCell: ResolvedPos, $headCell?: ResolvedPos = $anchorCell) → CellSelection

• static sectionSelection($anchorCell: ResolvedPos, $headCell?: ResolvedPos = $anchorCell) → CellSelection

• static fromJSON(doc: Node, json: CellSelectionJSON) → CellSelection

• static create(doc: Node, anchorCell: number, headCell?: number = anchorCell) → CellSelection

Commands

The following commands can be used to make table-editing functionality available to users.

• addColumnBefore(state: EditorState, dispatch?: fn(tr: Transaction), view?: EditorView) → boolean
  Command to add a column before the column with the selection.

• addColumnAfter(state: EditorState, dispatch?: fn(tr: Transaction), view?: EditorView) → boolean
  Command to add a column after the column with the selection.

• deleteColumn(state: EditorState, dispatch?: fn(tr: Transaction), view?: EditorView) → boolean
  Command function that removes the selected columns from a table.

• addRowBefore(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Add a table row before the selection.

• addRowAfter(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Add a table row after the selection.

• deleteRow(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Remove the selected rows from a table.

• addCaption(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Add a caption to the table, if not already present.

• deleteCaption(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Remove the caption from the table, if present.

• addTableHead(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Add a head section to the table, if not already present.

• addTableFoot(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Add a foot section to the table, if not already present.

• addBodyBefore(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Add a body section before the first section touched by the selection.

• addBodyAfter(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Add a body section after the first section touched by the selection.

• deleteSection(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Delete selected table sections, even when partially selected.

• makeBody(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Make a new table body with the rows in the selection.

• makeHead(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Make the table head with the rows in the selection (they must be the first rows).

• makeFoot(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Make the table foot with the rows in the selection (they must be the last rows).

• mergeCells(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Merge the selected cells into a single cell. Only available when the selected cells' outline forms a rectangle.

• splitCell(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Split a selected cell, whose rowpan or colspan is greater than one, into smaller cells. Use the first cell type for the new cells.

• splitCellWithType(getCellType: fn(options: GetCellTypeOptions) → NodeType) → Command
  Split a selected cell, whose rowpan or colspan is greater than one, into smaller cells with the cell type (th, td) returned by getType function.

• setCellAttr(name: string, value: unknown) → Command
  Returns a command that sets the given attribute to the given value, and is only available when the currently selected cell doesn't already have that attribute set to that value.

• toggleHeaderRow: Command
  Toggles whether the selected row contains header cells.

• toggleHeaderColumn: Command
  Toggles whether the selected column contains header cells.

• toggleHeaderCell: Command
  Toggles whether the selected cells are header cells.

• goToNextCell(direction: Direction) → Command
  Returns a command for selecting the next (direction=1) or previous (direction=-1) cell in a table.

• deleteTable(state: EditorState, dispatch?: fn(tr: Transaction)) → boolean
  Deletes the table around the selection, if any.

Utilities

• fixTables(state: EditorState, oldState?: EditorState) → Transaction | undefined
  Inspect all tables in the given state's document and return a transaction that fixes them, if necessary. If oldState was provided, that is assumed to hold a previous, known-good state, which will be used to avoid re-scanning unchanged parts of the document.

class TableMap

A table map describes the structure of a given table. To avoid recomputing them all the time, they are cached per table node. To be able to do that, positions saved in the map are relative to the start of the table, rather than the start of the document.

• new TableMap(width: number, height: number, map: number[], sectionRows: number[], problems: Problem[] | null)

• width: number
  The number of columns

• height: number
  The number of rows

• map: number[]
  A width * height array with the start position of the cell covering that part of the table in each slot

• sectionRows: number[]
  The number of rows of each table section

• problems: Problem[] | null
  An optional array of problems (cell overlap or non-rectangular shape) for the table, used by the table normalizer.

• findCell(pos: number) → Rect

• colCount(pos: number) → number

• nextCell(pos: number, axis: "horiz" | "vert", dir: number) → number | null

• rectBetween(a: number, b: number) → Rect

• cellsInRect(rect: Rect) → number[]

• sectionsInRect(rect: Rect) → number[]

• isLastRowInSection(row: number) → boolean

• positionAt(row: number, col: number, table: Node) → number

• findSection(pos: number) → Rect

• sectionOfRow(row: number) → number

• rectOverOneSection(rect: Rect) → boolean

• static get(table: Node) → TableMap

Utility functions

• getRow(table: Node, row: number) → {node: Node | null, pos: number, section: number}
  returns an object with the node, the position and the section index of a row in a table

• isRowLastInSection(table: Node, row: number) → boolean
  returns true when the row is the last of a section in the table

• rowPos(table: Node, row: number) → number
  the relative position of a row in a table

• rowAtPos(table: Node, pos: number) → number
  the index of the row at the specified relative position in the table

• rowsCount(table: Node) → number
  returns the number of rows of a table, without using its associated TableMap

• tableBodiesCount(table: Node) → number
  returns the number of bodies in the table

• tableHasCaption(table: Node) → boolean
  returns true when the table has a caption

• tableHasFoot(table: Node) → boolean
  returns true if the table has a foot

• tableHasHead(table: Node) → boolean
  returns true if the table has a head

• tableSectionsCount(table: Node) → number
  returns the number of sections (head, bodies, foot) in the table