React-Tags

React-tags is a simple tagging component ready to drop in your React projects. The component is inspired by GMail's To field in the compose window.

Features

• Autocomplete based on a suggestion list
• Keyboard friendly and mouse support
• Reorder tags using drag and drop

Why

Because I was looking for an excuse to build a standalone component and publish it in the wild? To be honest, I needed a tagging component that provided the above features for my React-Surveyman project. Since I was unable to find one which met my requirements (and the fact that I generally enjoy re-inventing the wheel) this is what I came up with.

Demo

Check it out here

Installation

The preferred way of using the component is via NPM

npm install --save react-tag-input

make sure you have installed the peer dependencies as well with below versions

react: ^16.3.1,
react-dnd: ^5.0.0
react-dnd-html5-backend: ^3.0.2
react-dom": ^16.3.1

It is, however, also available to be used separately (dist/ReactTags.min.js). If you prefer this method remember to include ReactDND as a dependancy. Refer to the example to see how this works.

Usage

Here's a sample implementation that initializes the component with a list of initial tags and suggestions list. Apart from this, there are multiple events, handlers for which need to be set. For more details, go through the API.

import React from 'react';
import ReactDOM from 'react-dom';
import { WithContext as ReactTags } from 'react-tag-input';

const KeyCodes = {
  comma: 188,
  enter: 13,
};

const delimiters = [KeyCodes.comma, KeyCodes.enter];

class App extends React.Component {
    constructor(props) {
        super(props);

        this.state = {
            tags: [
                { id: "Thailand", text: "Thailand" },
                { id: "India", text: "India" }
             ],
            suggestions: [
                { id: 'USA', text: 'USA' },
                { id: 'Germany', text: 'Germany' },
                { id: 'Austria', text: 'Austria' },
                { id: 'Costa Rica', text: 'Costa Rica' },
                { id: 'Sri Lanka', text: 'Sri Lanka' },
                { id: 'Thailand', text: 'Thailand' }
             ]
        };
        this.handleDelete = this.handleDelete.bind(this);
        this.handleAddition = this.handleAddition.bind(this);
        this.handleDrag = this.handleDrag.bind(this);
    }

    handleDelete(i) {
        const { tags } = this.state;
        this.setState({
         tags: tags.filter((tag, index) => index !== i),
        });
    }

    handleAddition(tag) {
        this.setState(state => ({ tags: [...state.tags, tag] }));
    }

    handleDrag(tag, currPos, newPos) {
        const tags = [...this.state.tags];
        const newTags = tags.slice();

        newTags.splice(currPos, 1);
        newTags.splice(newPos, 0, tag);

        // re-render
        this.setState({ tags: newTags });
    }

    render() {
        const { tags, suggestions } = this.state;
        return (
            <div>
                <ReactTags tags={tags}
                    suggestions={suggestions}
                    handleDelete={this.handleDelete}
                    handleAddition={this.handleAddition}
                    handleDrag={this.handleDrag}
                    delimiters={delimiters} />
            </div>
        )
    }
};

ReactDOM.render(<App />, document.getElementById('app'));

A note about Contexts One of the dependencies of this component is the react-dnd library. Since the 1.0 version, the original author has changed the API and requires the application using any draggable components to have a top-level backend context. So if you're using this component in an existing Application that uses React-DND you will already have a backend defined, in which case, you should require the component without the context.

const ReactTags = require('react-tag-input').WithOutContext;

Otherwise, you can simply import along with the backend itself (as shown above). If you have ideas to make this API better, I'd love to hear.

Options

Option	Type	Default	Description
tags	Array	[]	An array of tags that are displayed as pre-selected
suggestions	Array	[]	An array of suggestions that are used as basis for showing suggestions
delimiters	Array	[ENTER, TAB]	Specifies which characters should terminate tags input
placeholder	String	Add new tag	The placeholder shown for the input
labelField	String	text	Provide an alternative label property for the tags
handleAddition	Function	undefined	Function called when the user wants to add a tag (required)
handleDelete	Function	undefined	Function called when the user wants to delete a tag (required)
handleDrag	Function	undefined	Function called when the user drags a tag
handleFilterSuggestions	Function	undefined	Function called when filtering suggestions
handleTagClick	Function	undefined	Function called when the user wants to know which tag was clicked
autofocus	Boolean	true	Boolean value to control whether the text-input should be autofocused on mount
allowDeleteFromEmptyInput	Boolean	true	Boolean value to control whether tags should be deleted when the 'Delete' key is pressed in an empty Input Box
handleInputChange	Function	undefined	Event handler for input onChange
handleInputFocus	Function	undefined	Event handler for input onFocus
handleInputBlur	Function	undefined	Event handler for input onBlur
minQueryLength	Number	2	How many characters are needed for suggestions to appear
removeComponent	Boolean	false	Custom delete/remove tag element
autocomplete	Boolean/Number	false	Ensure the first matching suggestion is automatically converted to a tag when a delimiter key is pressed
readOnly	Boolean	false	Read-only mode without the input box and removeComponent and drag-n-drop features disabled
name	String	undefined	The name attribute added to the input
id	String	undefined	The id attribute added to the input
maxLength	Number	Infinity	The maxLength attribute added to the input
inline	Boolean	true	Render input field and selected tags in-line
inputFieldPosition	String	inline	Specify position of input field relative to tags
allowUnique	Boolean	true	Boolean value to control whether tags should be unqiue
allowDragDrop	Boolean	true	Boolean value to control whether tags should have drag-n-drop features enabled
renderSuggestion	Function	undefined	Render prop for rendering your own suggestions

tags (optional, defaults to [])

An array of tags that are displayed as pre-selected. Each tag should have an id property, property for the label, which is specified by the labelField and class for label, which is specified by className.

// With default labelField
const tags =  [ { id: "1", text: "Apples" } ]

// With labelField of `name`
const tags =  [ { id: "1", name: "Apples" } ]

// With className
const tags = [ { id: "1", text: "Apples", className: 'red'} ]

suggestions (optional, defaults to [])

An array of suggestions that are used as basis for showing suggestions. These objects should follow the same structure as the tags. So if the labelField is name, the following would work:

// With labelField of `name`
const suggestions = [
    { id: "1", name: "mango" },
    { id: "2", name: "pineapple"},
    { id: "3", name: "orange" },
    { id: "4", name: "pear" }
];

<a name="delimiters"></a>
##### delimiters (optional, defaults to `[ENTER, TAB]`)
Specifies which characters should terminate tags input. An array of character codes.

```js
const Keys = {
    TAB: 9,
    SPACE: 32,
    COMMA: 188,
};
<ReactTags
    delimiters={[Keys.TAB, Keys.SPACE, Keys.COMMA]}
 />

placeholder (optional, defaults to Add new tag)

The placeholder shown for the input.

let placeholder = "Add new country"

labelField (optional, defaults to text)

Provide an alternative label property for the tags.

<ReactTags
    tags={tags}
    suggestions={}
    labelField={'name'}
    handleDrag={}
 />

This is useful if your data uses the text property for something else.

handleAddition (required)

Function called when the user wants to add a tag (either a click, a tab press or carriage return)

function(tag) {
    // add the tag to the tag list
}

handleDelete (required)

Function called when the user wants to delete a tag

function(i) {
    // delete the tag at index i
}

handleDrag (optional)

If you want tags to be draggable, you need to provide this function. Function called when the user drags a tag.

function(tag, currPos, newPos) {
    // remove tag from currPos and add in newPos
}

handleFilterSuggestions (optional)

To assert control over the suggestions filter, you may contribute a function that is executed whenever a filtered set of suggestions is expected. By default, the text input value will be matched against each suggestion, and those that start with the entered text will be included in the filters suggestions list. If you do contribute a custom filter function, you must return an array of suggestions. Please do not mutate the passed suggestions array.

For example, if you prefer to override the default filter behavior and instead match any suggestions that contain the entered text anywhere in the suggestion, your handleFilterSuggestions property may look like this:

function(textInputValue, possibleSuggestionsArray) {
    var lowerCaseQuery = textInputValue.toLowerCase()

    return possibleSuggestionsArray.filter(function(suggestion)  {
        return suggestion.toLowerCase().includes(lowerCaseQuery)
    })
}

Note: The above custom filter uses String.prototype.includes, which was added to JavaScript as part of the ECMAScript 7 specification. If you need to support a browser that does not yet include support for this method, you will need to either refactor the above filter based on the capabilities of your supported browsers, or import a polyfill for String.prototype.includes.

handleTagClick (optional)

Function called when the user wants to know which tag was clicked

function(i) {
    // use the tag details at index i
}

autofocus (optional, defaults to true)

Optional boolean param to control whether the text-input should be autofocused on mount.

<ReactTags
    autofocus={false}
    ...>

allowDeleteFromEmptyInput (optional, defaults to true)

Optional boolean param to control whether tags should be deleted when the 'Delete' key is pressed in an empty Input Box.

<ReactTags
    allowDeleteFromEmptyInput={false}
    ...>

handleInputChange (optional)

Optional event handler for input onChange

<ReactTags
    handleInputChange={this.handleInputChange}
    ...>

handleInputFocus (optional)

Optional event handler for input onFocus

<ReactTags
    handleInputFocus={this.handleInputFocus}
    ...>

handleInputBlur (optional)

Optional event handler for input onBlur

<ReactTags
    handleInputBlur={this.handleInputBlur}
    ...>

minQueryLength (optional, defaults to 2)

How many characters are needed for suggestions to appear.

removeComponent (optional)

If you'd like to supply your own tag delete/remove element, create a React component and pass it as a property to ReactTags using the removeComponent option. By default, a simple anchor link with an "x" text node as its only child is rendered, but if you'd like to, say, replace this with a <button> element that uses an image instead of text, your markup may look something like this:

import {WithContext as ReactTags} from 'react-tag-input'

class Foo extends React.Component {
   render() {
      return <ReactTags removeComponent={RemoveComponent}/>
   }
}

class RemoveComponent extends React.Component {
   render() {
      return (
         <button {...this.props}>
            <img src="my-icon.png" />
         </button>
      )
   }
}

The "ReactTags__remove" className and onClick handler properties can be automatically included on the <button> by using the JSX spread attribute, as illustrated above.

autocomplete (optional, defaults to false)

Useful for enhancing data entry workflows for your users by ensuring the first matching suggestion is automatically converted to a tag when a delimiter key is pressed (such as the enter key). This option has three possible values:

• true - when delimeter key (such as enter) is pressed, first matching suggestion is used.
• 1 - when delimeter key (such as enter) is pressed, matching suggestion is used only if there is a single matching suggestion
• false (default) - tags are not autocompleted on enter/delimiter

This option has no effect if there are no suggestions.

readOnly (optional, defaults to false)

Renders the component in read-only mode without the input box and removeComponent. This also disables the drag-n-drop feature.

name (optional)

The name attribute added to the input.

<ReactTags
    name = "inputName"
    ...>

id (optional)

The id attribute added to the input.

<ReactTags
    id = "inputId"
    ...>

maxLength (optional)

The maxLength attribute added to the input. Specifies the maximum number of characters allowed in the input field.

<ReactTags
    maxLength = "42"
    ...>

inline (optional, defaults to true)

The inline attributes decides whether the input fields and selected tags will be rendered in-line.

<ReactTags
    inline
    ...>

<ReactTags
    inline={false}
    ...>

This attribute is deprecated and will be removed in v7.x.x, see inputFieldPosition.

inputFieldPosition (optional, defaults to inline)

The inputFieldPosition attribute decides the positioning of the input field relative to the tags. Can be one of inline, top or bottom.

<ReactTags
    inputFieldPosition="inline"
    ...>

<ReactTags
    inputFieldPosition="top"
    ...>

<ReactTags
    inputFieldPosition="bottom"
    ...>

allowUnique (optional, defaults to true)

This prop controls whether tags should be unique.

allowDragDrop (optional, defaults to true)

This prop controls whether tags should have the drag-n-drop feature enabled.

renderSuggestion (optional)

This props allows to provide your own suggestion renderer and override the default one. It receives the suggestion and the query string as parameters. For example:

<ReactTags
    renderSuggestion = {({ text }, query) => <div style={{ textDecoration: 'underline', textDecorationStyle: 'wavy' }}>{text} ({ query })</div>}
    ...>

Styling

<ReactTags> does not come up with any styles. However, it is very easy to customize the look of the component the way you want it. By default, the component provides the following classes with which you can style -

• ReactTags__tags
• ReactTags__tagInput
• ReactTags__tagInputField
• ReactTags__selected
• ReactTags__selected ReactTags__tag
• ReactTags__selected ReactTags__remove
• ReactTags__suggestions
• ReactTags__activeSuggestion

An example can be found in /example/reactTags.css.

If you need to set your own class names on the component, you may pass in a classNames prop.

  <ReactTags
    classNames={{
      tags: 'tagsClass',
      tagInput: 'tagInputClass',
      tagInputField: 'tagInputFieldClass',
      selected: 'selectedClass',
      tag: 'tagClass',
      remove: 'removeClass',
      suggestions: 'suggestionsClass',
      activeSuggestion: 'activeSuggestionClass'
    }}
    ...>

Dev

The component is written in ES6 and uses Webpack as its build tool.

Set up instructions

git clone git@github.com:prakhar1989/react-tags.git
cd react-tags
npm install
npm run precommit
npm run start

open http://localhost:8090/example

Contributing

Got ideas on how to make this better? Open an issue!

Thanks

The autocomplete dropdown is inspired by Lea Verou's awesomeplete library. The Drag and drop functionality is provided by Dan Abramov's insanely useful ReactDND library.

Also thanks to the awesome contributors who've made the library far better!