FOLASAYO SAMUEL OLAYEMIWhat is react-dual-listbox?
React Dual Listbox is a lightweight React component for rendering dual listbox views.
Here is a minimal example on how to use react-dual-listbox
You can Install the library using your favorite dependency manager.
Using yarn:
yarn add react-dual-listbox
Using npm:
npm install react-dual-listbox --save
Please, note that this library makes use of Font Awesome styles and expects them to be loaded in the browser.
Styling react-dual-listbox
For your convenience, the library's styles can be consumed utilizing one of the following files:
node_modules/react-dual-listbox/lib/react-dual-listbox.css
node_modules/react-dual-listbox/src/less/react-dual-listbox.less
node_modules/react-dual-listbox/src/scss/react-dual-listbox.scss
You can either include one of these files in your stylesheets or utilize a CSS loader.
Code sample:
import 'react-dual-listbox/lib/react-dual-listbox.css';
How to render Component
The DualListBox is a controlled component, so you have to update the selected property in conjunction with the onChange handler if you want the selected values to change.
Here is a minimal code sample for rendering of the component:
import React from 'react';
import DualListBox from 'react-dual-listbox';
const options = [
{ value: 'one', label: 'Option One' },
{ value: 'two', label: 'Option Two' },
];
class Widget extends React.Component {
state = {
selected: ['one'],
};
onChange = (selected) => {
this.setState({ selected });
};
render() {
const { selected } = this.state;
return (
<DualListBox
options={options}
selected={selected}
onChange={this.onChange}
/>
);
}
}
Optgroups is also supported
Note that, traditional <optgroup>'s are also supported.
Code sample:
render() {
const options = [
{
label: 'Earth',
options: [
{ value: 'luna', label: 'Moon' },
],
},
{
label: 'Mars',
options: [
{ value: 'phobos', label: 'Phobos' },
{ value: 'deimos', label: 'Deimos' },
],
},
{
label: 'Jupiter',
options: [
{ value: 'io', label: 'Io' },
{ value: 'europa', label: 'Europa' },
{ value: 'ganymede', label: 'Ganymede' },
{ value: 'callisto', label: 'Callisto' },
],
},
];
return <DualListBox options={options} />;
}
Disabling Component or Options
Pass in the disabled property to disable the entire component. Alternatively, individual options may be disabled on a per-item basis.
Code sample:
render() {
const options = [
{
label: 'Mars',
disabled: true,
options: [
{ value: 'phobos', label: 'Phobos' },
{ value: 'deimos', label: 'Deimos' },
],
},
{
label: 'Jupiter',
options: [
{ value: 'io', label: 'Io' },
{ value: 'europa', label: 'Europa', disabled: true },
{ value: 'ganymede', label: 'Ganymede' },
{ value: 'callisto', label: 'Callisto' },
],
},
];
return <DualListBox options={options} />;
}
Filtering
You can enable filtering of available and selected options by merely passing in the canFilter property.
Code sample:
render() {
...
return <DualListBox canFilter options={options} />;
}
Note that, you can also optionally override the default filter placeholder text and the filtering function.
Code sample:
render() {
...
return (
<DualListBox
canFilter
filterCallback={(option, filterInput) => {
if (filterInput === '') {
return true;
}
return (new RegExp(filterInput, 'i')).test(option.label);
}}
filterPlaceholder="Filter..."
options={options}
/>
);
}
You can also control the filter search text, rather than leaving it up to the component.
Code sample:
render() {
...
return (
<DualListBox
canFilter
filter={{
available: 'europa',
selected: '',
}}
options={options}
onFilterChange={(filter) => {
console.log(filter;
}}
/>
);
}
Action/Button Alignment
Note that, by default the movement buttons are aligned to the center of the component. Another option is to align these actions to be above their respective lists.
Code Sample:
render() {
...
return (
<DualListBox alignActions="top" options={options} />
);
}
Preserve Select Ordering
By default, react-dual-listbox will order any selected items according to the order of the options property. There may be times in which you wish to preserve the selection order instead. In this case, you can add the preserveSelectOrder property.
Note that, any <optgroup>'s supplied will not be surfaced when preserving the selection order.
Code sample:
render() {
...
return <DualListBox options={options} preserveSelectOrder />;
}
To allow users to re-arrange their selections after moving items to the right, you may also pass in the showOrderButtons property.
Restrict Available Options
Sometimes, it may be desirable to restrict what options are available for selection. For example, you may have a control above the dual listbox that allows a user to search for a planet in the solar system. Once a planet is selected, you want to restrict the available options to the moons of that planet. Use the available property in that case.
Code sample:
render() {
...
// Let's restrict ourselves to the Jovian moons
const available = ['io', 'europa', 'ganymede', 'callisto'];
return <DualListBox options={options} available={available} />;
}
Changing the Default Icons
By default, react-dual-listbox uses Font Awesome for the various icons that appear in the component. To change the defaults, simply pass in the icons property and override the defaults.
Code sample:
<DualListBox
...
icons={{
moveLeft: <span className="fa fa-chevron-left" />,
moveAllLeft: [
<span key={0} className="fa fa-chevron-left" />,
<span key={1} className="fa fa-chevron-left" />,
],
moveRight: <span className="fa fa-chevron-right" />,
moveAllRight: [
<span key={0} className="fa fa-chevron-right" />,
<span key={1} className="fa fa-chevron-right" />,
],
moveDown: <span className="fa fa-chevron-down" />,
moveUp: <span className="fa fa-chevron-up" />,
moveTop: <span className="fa fa-double-angle-up" />,
moveBottom: <span className="fa fa-double-angle-down" />,
}}
/>
Extract Changed Values
At times, it may be useful to know which options the user highlighted when the selected values change. In this case, the second parameter of the onChange handler may be used.
Code sample:
class Widget extends React.Component {
...
onChange = (selected, selection) => {
console.log('The user highlighted these options', selection);
this.setState({ selected });
};
...
}
Thanks for reading...
Happy Coding!
