@wordpress/rich-text
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This module contains helper functions to convert HTML or a DOM tree into a rich text value and back, and to modify the value with functions that are similar to String methods, plus some additional ones for formatting.
Install the module
npm install @wordpress/rich-text
This package assumes that your code will run in an ES2015+ environment. If you're using an environment that has limited or no support for such language features and APIs, you should include the polyfill shipped in @wordpress/babel-preset-default in your code.
The Rich Text package is designed to aid in the manipulation of plain text strings in order that they can represent complex formatting.
By using a RichTextValue value object (referred to from here on as value) it is possible to separate text from formatting, thereby affording the ability to easily search and manipulate rich formats.
Examples of rich formats include:
The value object is comprised of the following:
text - the string of text to which rich formats are to be applied.formats - a sparse array of the same length as text that is filled with formats (e.g. core/link, core/bold etc.) at the positions where the text is formatted.start - an index in the text representing the start of the currently active selection.end - an index in the text representing the end of the currently active selection.You should not attempt to create your own value objects. Rather you should rely on the built in methods of the @wordpress/rich-text package to build these for you.
It is important to understand how a value represents richly formatted text. Here is an example to illustrate.
If text is formatted from position 2-5 in bold (core/bold) and from position 2-8 with a link (core/link), then you'll find:
core/bold formatcore/link formatHere's how that would look:
{
text: 'Hello world', // length 11
formats: [
[], // 0
[],
[ // 2
{
type: 'core/bold',
},
{
type: 'core/link',
}
],
[
{
type: 'core/bold',
},
{
type: 'core/link',
}
],
[
{
type: 'core/bold',
},
{
type: 'core/link',
}
],
[
{
type: 'core/bold',
},
{
type: 'core/link',
}
],
[ // 6
{
type: 'core/link',
}
]
[
{
type: 'core/link',
}
],
[
{
type: 'core/link',
}
],
[], // 9
[], // 10
[], // 11
]
}
Let's continue to consider the above example with the text Hello world.
If, as a user, I make a selection of the word Hello this would result in a value object with start and end as 0 and 5 respectively.
In general, this is useful for knowing which portion of the text is selected. However, we need to consider that selections may also be "collapsed".
A collapsed selection is one where start and end values are identical (e.g. start: 4, end: 4). This happens when no characters are selected, but there is a caret present. This most often occurs when a user places the cursor/caret within a string of text but does not make a selection.
Given that the selection has no "range" (i.e. there is no difference between start and end indices), finding the currently selected portion of text from collapsed values can be challenging.
Apply a format object to a Rich Text value from the given startIndex to the given endIndex. Indices are retrieved from the selection if none are provided.
Parameters
RichTextValue: Value to modify.RichTextFormat: Format to apply.[number]: Start index.[number]: End index.Returns
RichTextValue: A new value with the format applied.Combine all Rich Text values into one. This is similar to String.prototype.concat.
Parameters
...RichTextValue: Objects to combine.Returns
RichTextValue: A new value combining all given records.Create a RichText value from an Element tree (DOM), an HTML string or a plain text string, with optionally a Range object to set the selection. If called without any input, an empty value will be created. The optional functions can be used to filter out content.
A value will have the following shape, which you are strongly encouraged not to modify without the use of helper functions:
{
text: string,
formats: Array,
replacements: Array,
?start: number,
?end: number,
}
As you can see, text and formatting are separated. text holds the text, including any replacement characters for objects and lines. formats, objects and lines are all sparse arrays of the same length as text. It holds information about the formatting at the relevant text indices. Finally start and end state which text indices are selected. They are only provided if a Range was given.
Parameters
[Object]: Optional named arguments.[Element]: Element to create value from.[string]: Text to create value from.[string]: HTML to create value from.[Range]: Range to create value from.[boolean]:Returns
RichTextValue: A rich text value.Gets the format object by type at the start of the selection. This can be used to get e.g. the URL of a link format at the current selection, but also to check if a format is active at the selection. Returns undefined if there is no format at the selection.
Parameters
RichTextValue: Value to inspect.string: Format type to look for.Returns
RichTextFormat|undefined: Active format object of the specified type, or undefined.Gets the all format objects at the start of the selection.
Parameters
RichTextValue: Value to inspect.Array: Array to return if there are no active formats.Returns
RichTextFormatList: Active format objects.Gets the active object, if there is any.
Parameters
RichTextValue: Value to inspect.Returns
RichTextFormat|void: Active object, or undefined.Get the textual content of a Rich Text value. This is similar to Element.textContent.
Parameters
RichTextValue: Value to use.Returns
string: The text content.Insert a Rich Text value, an HTML string, or a plain text string, into a Rich Text value at the given startIndex. Any content between startIndex and endIndex will be removed. Indices are retrieved from the selection if none are provided.
Parameters
RichTextValue: Value to modify.RichTextValue|string: Value to insert.[number]: Start index.[number]: End index.Returns
RichTextValue: A new value with the value inserted.Insert a format as an object into a Rich Text value at the given startIndex. Any content between startIndex and endIndex will be removed. Indices are retrieved from the selection if none are provided.
Parameters
RichTextValue: Value to modify.RichTextFormat: Format to insert as object.[number]: Start index.[number]: End index.Returns
RichTextValue: A new value with the object inserted.Check if the selection of a Rich Text value is collapsed or not. Collapsed means that no characters are selected, but there is a caret present. If there is no selection, undefined will be returned. This is similar to window.getSelection().isCollapsed().
Parameters
RichTextValue: The rich text value to check.RichTextValue[ 'start' ]:RichTextValue[ 'end' ]:Returns
boolean | undefined: True if the selection is collapsed, false if not, undefined if there is no selection.Check if a Rich Text value is Empty, meaning it contains no text or any objects (such as images).
Parameters
RichTextValue: Value to use.Returns
boolean: True if the value is empty, false if not.Combine an array of Rich Text values into one, optionally separated by separator, which can be a Rich Text value, HTML string, or plain text string. This is similar to Array.prototype.join.
Parameters
Array<RichTextValue>: An array of values to join.[string|RichTextValue]: Separator string or value.Returns
RichTextValue: A new combined value.Registers a new format provided a unique name and an object defining its behavior.
Parameters
string: Format name.WPFormat: Format settings.Returns
WPFormat|undefined: The format, if it has been successfully registered; otherwise undefined.Remove content from a Rich Text value between the given startIndex and endIndex. Indices are retrieved from the selection if none are provided.
Parameters
RichTextValue: Value to modify.[number]: Start index.[number]: End index.Returns
RichTextValue: A new value with the content removed.Remove any format object from a Rich Text value by type from the given startIndex to the given endIndex. Indices are retrieved from the selection if none are provided.
Parameters
RichTextValue: Value to modify.string: Format type to remove.[number]: Start index.[number]: End index.Returns
RichTextValue: A new value with the format applied.Search a Rich Text value and replace the match(es) with replacement. This is similar to String.prototype.replace.
Parameters
RichTextValue: The value to modify.RegExp|string: A RegExp object or literal. Can also be a string. It is treated as a verbatim string and is not interpreted as a regular expression. Only the first occurrence will be replaced.Function|string: The match or matches are replaced with the specified or the value returned by the specified function.Returns
RichTextValue: A new value with replacements applied.The RichTextData class is used to instantiate a wrapper around rich text values, with methods that can be used to transform or manipulate the data.
new RichTextData().RichTextData.fromHTMLString( '<em>hello</em>' ).RichTextData.fromHTMLElement( document.querySelector( 'p' ) ).RichTextData.fromPlainText( '1\n2' ).new RichTextData( { text: '...', formats: [ ... ] } ).An object which represents a formatted string. See main @wordpress/rich-text documentation for more information.
Slice a Rich Text value from startIndex to endIndex. Indices are retrieved from the selection if none are provided. This is similar to String.prototype.slice.
Parameters
RichTextValue: Value to modify.[number]: Start index.[number]: End index.Returns
RichTextValue: A new extracted value.Split a Rich Text value in two at the given startIndex and endIndex, or split at the given separator. This is similar to String.prototype.split. Indices are retrieved from the selection if none are provided.
Parameters
RichTextValue:[number|string]: Start index, or string at which to split.Returns
Array<RichTextValue>|undefined: An array of new values.Store definition for the rich-text namespace.
Related
Type
ObjectToggles a format object to a Rich Text value at the current selection.
Parameters
RichTextValue: Value to modify.RichTextFormat: Format to apply or remove.Returns
RichTextValue: A new value with the format applied or removed.Create an HTML string from a Rich Text value.
Parameters
Object: Named arguments.RichTextValue: Rich text value.[boolean]: Preserves newlines if true.Returns
string: HTML string.Unregisters a format.
Parameters
string: Format name.Returns
WPFormat|undefined: The previous format value, if it has been successfully unregistered; otherwise undefined.This hook, to be used in a format type's Edit component, returns the active element that is formatted, or a virtual element for the selection range if no format is active. The returned value is meant to be used for positioning UI, e.g. by passing it to the Popover component via the anchor prop.
Parameters
Object: Named parameters.HTMLElement|null: The element containing the editable content.WPFormat=: The format type's settings.Returns
Element|VirtualAnchorElement|undefined|null: The active element or selection range.This hook, to be used in a format type's Edit component, returns the active element that is formatted, or the selection range if no format is active. The returned value is meant to be used for positioning UI, e.g. by passing it to the Popover component.
Parameters
Object: Named parameters.RefObject<HTMLElement>: React ref of the element containing the editable content.RichTextValue: Value to check for selection.WPFormat: The format type's settings.Returns
Element|Range: The active element or selection range.This is an individual package that's part of the Gutenberg project. The project is organized as a monorepo. It's made up of multiple self-contained software packages, each with a specific purpose. The packages in this monorepo are published to npm and used by WordPress as well as other software projects.
To find out more about contributing to this package or Gutenberg as a whole, please read the project's main contributor guide.
FAQs
Rich text value and manipulation API.
We found that @wordpress/rich-text demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 23 open source maintainers collaborating on the project.
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