Knockout-EditableCell

Knockout-EditableCell (or just editableCell) is an extension to Knockout for turning ordinary table cells into selectable, editable cells, behaving much like cells in Microsoft Excel.

It supports features like:

• Keyboard and mouse navigation
• Cell selection (both via the keyboard and the mouse)
• In-place editing of a Knockout observable
• Additional display customization of the observable value (via cellText and cellHTML functions)
• Applying a new value to all selected cells (via Ctrl+ENTER)

Try out the demo! Or on JSBin!

Requirements

editableCell depends upon Knockout (and therefore has an implicit dependency on jQuery).

v2.1.1 supports Knockout v3.0.0+, and is compatible with any version of jQuery supported by Knockout.

Browser support

editableCell should support most modern browsers: IE8+, FF 31+, Chrome 31+, Safari 7+

Support will also depend on the versions of Knockout and jQuery in use.

Please file an issue or update our tracking issue if your run into any problems

Getting Started

Adding editableCell to your project

You can obtain editableCell in a number of ways:

• Download the files in the out folder manually (shown below, assuming you've placed the files in the vendor folder)
• NEW: editableCell is now available via Bower! The package name is knockout-editable-cell

$ bower install knockout-editable-cell

• You can use a CDN: https://cdn.rawgit.com/gnab/editableCell/v2.1.1/out/editableCell.min.js
• SOON: Via NuGet!

Loading editableCell

editableCell can be loaded via a normal script tag, or using and AMD loader (like RequireJS).

Via a script tag:

<!-- Add 'editableCell' right after your current Knockout script -->
<script type="text/javascript" src="http://knockoutjs.com/downloads/knockout-3.2.0.js"></script>
<script type="text/javascript" src="vendor/editableCell.js"></script>

Via RequireJS:

/* Add 'editableCell' to your existing requireJs configuration */

requirejs.config({
    paths: {
        knockout: './node_modules/knockout/build/output/knockout-latest',
        editableCell: './vendor/editableCell.min'
    }
});

Usage

editableCell is a Knockout binding targeting table cells (td). By default, they will be selectable and editable. You just need to pass a Knockout observable or computed property to the binding:

<table>
    <tr>
        <td data-bind="editableCell: name"></td>
    </tr>
</table>

To customize the default behaviour, you may use the following supplemental binding properties:

• cellReadOnly - Whether the cell should be editable. It will always, however, remain selectable.
• cellText - The text to display when the cell is not being edited.
• cellHTML - A more advanced version of cellText that allows additional customization.

Typically, cellHTML is bound to function on your view model that returns a string of HTML. editableCell will automatically call this function with the bound observable's current value, and you can return a string containing arbitrary HTML that will be inserted inside the td.

<!-- Won't be editable-->
<td data-bind="editableCell: id, cellReadOnly: true"></td>

<!-- Will display '23 years' if age() === 23 -->
<td data-bind="editableCell: age, cellText: age() + ' years'"></td>

<!-- Turns a string into an HTML element inside the TD.
     If the user edits the cell, the function will be called
     with the new 'price' value -->
<td data-bind="editableCell: price, cellHTML: priceWithCurrencySpan"></td>

Selection

You can select cells using the mouse (by dragging), or by using the Shift + arrow keyboard shortcuts.

When you select multiple cells, you typically want to perform an action based on the contents. In order to get the currently selected cells in the table, you can bind an observable array (i.e., selection below) to your table using the editableCellSelection binding:

/* in your viewmodel */
var selection = ko.observableArray();

<!-- in your view -->
<table data-bind="editableCellSelection: selection">

Whenever the user selects one or more cells in the table, the observable array will be updated. The array will contain:

[
  {
    cell: elem /* HTMLTableCellElement */,
	value: val /* the (observable) property that editableCell is bound to */,
	text: txt /* the (observable) property that editableCell is bound to via the 'cellText' binding, or else the same as value */
  },
  /* { ... */
]

Rows / cells not using editableCell

If you have rows or cells that don't use the editableCell binding, or don't use Knockout bindings at all, then editableCell won't navigate to them (using the keyboard, for instance).

If there are rows or cells not using the editableCell binding separating rows or cells that are, then navigation will hop over the unbound cells, similarly to the way navigating between tables (see Sharing selection, below).

Copying & Pasting

editableCell supports both pasting in structured data to one or more cells, and copying values from table cells. In the latter case, the values will be pasted as a tab-delimited array of values (columns), and rows will be separated by cr-lf.

Sharing selection

The parent table uses the editableCellSelection binding for keeping track of selected cells. If two or more tables share the same Knockout observable array in their editableCellSelection bindings, then editableCell will:

• ensure that the user can only select cells in one table at a time.
• allow the user to navigate between the linked tables using the keyboard.

List of keyboard shortcuts

arrow keys

Navigate in the table.

Shift + arrow

Select cells in the table.

Ctrl + Shift + arrow

Select all cells in the table, starting from currently-selected cell.

Escape

Cancel editing

Enter

Complete editing. Your change will also be automatically applied if you navigate away from the cell.

Ctrl + Enter

If you have multiple cells selected, and begin editing, this will apply the value to all selected cells.

Delete or Ctrl + Backspace

Replaces the current value with `null`, if the underlying observable supports it.

Overriding Styling

Cell styling

For the table, tr, and td or th tags, editableCell does not add any styles itself. Feel free to style your table how you please.

When editing a cell, editableCell uses an input element with the CSS class editable-cell-input for editing. This is only directly visible when the user double-clicks on the cell.

If you wanted to make the text bold when it's being edited, you could:

    .editable-cell-input { font-weight: bold; }

Selection styling

The selection styling is done with a semi-transparent div that has the CSS class editable-cell-selection.

If you wanted to have a selection that was light blue, rather than orange, you could:

    .editable-cell-selection { background-color: rgba(200, 100, 30, .015) !important; }

Comparison to other editing libraries

Other 'editable' libraries approach the same problem in slightly-different ways.

Some, like x-editable don't fit particularly well with large amounts of table-structured data. We wanted an user-experience closer to Excel-style editing.

Others try to build a wrapper around contentEditable. An early version of editableCell tried this, but we ran into some issues. (For more details, see issue #3).

Finally, there are a large number of table or grid components, like Handsontable, <a href-"https://github.com/Knockout-Contrib/KoGrid">ko-grid, and others. These are great solutions, but the drawback is that they are very focused on controlling the entire table 'surface'. That is, they usually assume that you will configure the table definition in javascript and give them a container DOM element to render into. We wanted to embrace the existing layout, and (potentially) make only a single row (or even cell) editable.

And of course, we wanted to fit well in a project already using Knockout.

License

This project is licensed under the MIT license.

Contributing

Building editableCell

• Clone the repository
• Install dependencies

$ npm install

• Run node make - both minified and non-minified versions of editableCell will be placed in the out folder