Treeselect JS component

A multi-select js component with nested options.

- React wrapper - https://www.npmjs.com/package/react-treeselectjs
- Vue wrapper - https://www.npmjs.com/package/vue-treeselectjs
- Full key support (ArrowUp, ArrowDown, Space, ArrowLeft, ArrowRight, Enter)
- Screen sensitive direction
- Typescript support

Build data:
- treeselectjs.mjs 51.89 kB │ gzip: 11.67 kB
- treeselectjs.umd.js 41.92 kB │ gzip: 10.43 kB
- treeselectjs.css 7.08 kB │ gzip: 1.41 kB

Live Demo: https://dipson88.github.io/treeselectjs/

!Example img

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``bash
npm install --save treeselectjs
`
Import treeselectjs (ES)
`
import Treeselect from 'treeselectjs'

@import 'treeselectjs/dist/treeselectjs.css' // Styles
`

Import treeselectjs (UMD)
`


...

`

Example
`
import Treeselect from 'treeselectjs'

const options = [
{
name: 'England',
value: 1,
children: [
{
name: 'London',
value: 2,
children: [
{
name: 'Chelsea',
value: 3,
children: []
},
{
name: 'West End',
value: 4,
children: []
}
]
},
{
name: 'Brighton',
value: 5,
children: []
}
]
},
{
name: 'France',
value: 6,
children: [
{
name: 'Paris',
value: 7,
children: []
},
{
name: 'Lyon',
value: 8,
children: []
}
]
}
]

// Use slot if you need
const slot = document.createElement('div')
slot.innerHTML='Click!'

const domElement = document.querySelector('.treeselect-demo')
const treeselect = new Treeselect({
parentHtmlContainer: domElement,
value: [4, 7, 8],
options: options,
listSlotHtmlComponent: slot
})

treeselect.srcElement.addEventListener('input', (e) => {
console.log('Selected value:', e.detail)
})

slot.addEventListener('click', (e) => {
e.preventDefault()
alert('Slot click!')
})
`
---

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#### Core props
Name | Type (default) | Description
------------- | ------------- | -------------
parentHtmlContainer | HTMLElement (required!) | It should be a HTML element (div), it will be changed to the list container.
value | Array[String \| Number] ([]) | An array of value from options prop. This value will be selected on load of the treeselect. You can call updateValue to update prop or set value treeselect.value and call mount. The value changes if you check/uncheck checkboxes or remove tags from the input.
options | Array[Object] ([]) | It is an array of objects `{name: String, value: String \| Number, disabled?: Boolean, htmlAttr?: object, isGroupSelectable?: boolean, children: [] }`, where children are the same array of objects. Do not use duplicated value field. But you can use duplicated names. Read more.
disabled | Boolean (false) | List will be disabled.
id | String ('') | id attribute for the accessibility.
ariaLabel | String ('') | ariaLabel attribute for the accessibility.
isSingleSelect | Boolean (false) | Converts multi-select to the single value select. Checkboxes will be removed. You should pass only one id instead of array of values. Also you can set showTags to false. It helps to show treeselect as a dropdown.
isGroupedValue | Boolean (false) | Return groups if they selected instead of separate ids. Treeselect returns only leaves ids by default.
isIndependentNodes | Boolean (false) | All nodes in treeselect work as an independent entity. Check/uncheck action ignore children/parent updates workflow. Disabled nodes ignore children/parent workflow as well.
rtl | Boolean (false) | RTL mode.
isBoostedRendering | Boolean (false) | Experimental - Improves list rendering performance by using visibility-based optimizations and IntersectionObserver. Useful for efficiently rendering large lists.

#### List settings props
Name | Type (default) | Description
------------- | ------------- | -------------
disabledBranchNode | Boolean (false) | It is impossible to select groups. You can select only leaves.
openLevel | Number (0) | All groups will be opened to this level.
appendToBody | Boolean (false) | List will be appended to the body instead of the input container.
alwaysOpen | Boolean (false) | List will be always opened. You can use it for comfortable style changing. If you what to use it as an opened list, turn staticList to true.
showCount | Boolean (false) | Shows count of children near the group's name.
staticList | Boolean (false) | Add the list as a static DOM element. List doesn't overlap content. This prop will be ignored if you use appendToBody.
emptyText | String ('No results found...') | A empty list text.
listSlotHtmlComponent | HTMLElement (null) | It should be a HTML element, it will be append to the end of the list.
direction | String (auto) | A force direction for the list. Supported values: auto, top, bottom.
expandSelected | Boolean (false) | All groups which have checked values will be expanded on the init.
saveScrollPosition | Boolean (true) | The list saves the last scroll position before close. If you open the list your scroll will be on the previous position. If you set the value to false - the scroll will have position 0 and the first item will be focused every time.
listClassName | String ('') | A class name for list. Useful to change styles for appendToBody mode.

#### Input settings props
Name | Type (default) | Description
------------- | ------------- | -------------
showTags | Boolean (true) | Selected values look like tags. The false value shows results as '{count} elements selected'. You can change text if you use tagsCountText prop. For one selected element, you will see a name of this element.
tagsCountText | String ('elements selected') | This text will be shown if you use 'showTags'. This text will be inserted after the count of the selected elements - `'{count} {tagsCountText}'`.
tagsSortFn | (a: TagsSortItem, b: TagsSortItem) => number \| null (null) | Defines the sorting order for tags in the input field.
TagsSortItem - { value: ValueOptionType, name: string }.
clearable | Boolean (true) | Clear icon is available.
searchable | Boolean (true) | Search is available.
placeholder | String ('Search...') | Placeholder text.
grouped | Boolean (true) | Show groups in the input and group leafs if all group selected.

#### Callback props
Check Emits section for more info.

Name | Type (default) | Description
------------- | ------------- | -------------
inputCallback | (value) => void (undefined) | Callback method for input if you don't want to to eventListener.
openCallback | (value) => void (undefined) | Callback method for open if you don't want to use eventListener.
closeCallback | (value) => void (undefined) | Callback method for close if you don't want to use eventListener.
nameChangeCallback | (name) => void (undefined) | Callback method for name-change if you don't want to use eventListener.
searchCallback | (value) => void (undefined) | Callback method for search if you don't want to use eventListener.
openCloseGroupCallback | (groupId: ValueOptionType, isClosed: boolean) => void (undefined) | Callback method for open-close-group if you don't want to use eventListener.

#### Additional props
Name | Type (default) | Description
------------- | ------------- | -------------
iconElements | Object({ arrowUp, ... }) | Object contains all svg icons. You can use HTMLElement or a String to reset values from the default Object. Object: `iconElements: { arrowUp, arrowDown, arrowRight, attention, clear, cross, check, partialCheck }`. After reset of icon you have to update styles if it is necessary, use alwaysOpen prop for more comfortable work with styles changes.

---

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Is is description of the one option of the options prop:
Name | Type | Description
------------- | ------------- | -------------
value | String \| Number (required!) | It is a value of the node. It should be unique!
name | String (required!) | It is the name of the node. Can be duplicated.
disabled | Boolean (optional) | The node will be disabled. It is an optional field, you can skip it if no need to work with disabled values.
htmlAttr | Object (optional) | The object of the HTML attributes, the value of the object should be a String type. These attributes will be merged into the node HTML tag.
isGroupSelectable | Boolean (optional - true) | Determines whether groups are selectable. This behavior is similar to the disabledBranchNode prop but applies specifically to groups. It does not affect regular (non-group) items.
children | {name: String, value: String, disabled?: Boolean, htmlAttr?: object, children: [] }[] | Children are the same array of objects.

---

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Name | Return Type | Description
------------- | ------------- | -------------
input | Array[String \| Number] | Returns selected values, action is triggered on change the list value. Add eventListener or use inputCallback prop to get value.
open | Array[String \| Number] | Returns selected values, action is triggered on opening the list. Add eventListener or use openCallback prop to get value.
close | Array[String \| Number] | Returns selected values, action is triggered on closing the list. Add eventListener or use closeCallback prop to get value.
name-change | String | Returns selected name inside the input, action is triggered on on change the list. Add eventListener or use nameChangeCallback prop to get name.
search | String | Returns entered search value, action is triggered on change search value during the typing. Add eventListener or use searchCallback prop to get value. You can try create something like autocomplete with help of this event.
open-close-group | { groupId: [String \| Number], isClosed: Boolean } | Returns groupId and closed/open status of this group, action is triggered on open/close group in the list. Add eventListener or use openCloseGroupCallback prop to get value.

---

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Name | Params | Description
------------- | ------------- | -------------
updateValue | Array[String \| Number] | Update selected values.
mount | None | Helps to remount and update settings. Change settings that you need (treeselect.appendToBody = true), then call mount().
destroy | None | Deletes elements from the DOM. Call mount() to add treeselect to the DOM with previously saved internal data. If you need to recreate treeselect with default params - call `new Treeselect(options)``.
focus | None | Focuses treeselect input without open/close state changes.
toggleOpenClose | None | Open or close treeselect list and focus treeselect input.

---

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1) If you want to change the padding of the element you can use CSS selector. I've added 'group' and 'level' attributes, but you have to use !important.
2) If you want to update props, set props to the entity of the class and then call mount() method.
3) Use updateValue() method to update only the value.
4) If you need to delete List from the DOM when you don't need treeselect anymore - call destroy().
5) Do not use duplicated values for the options. You will see a error with duplicated values. But you can use duplicated names.
6) Value prop inside the options prop should be a String or Number.
7) If you use isSingleSelect prop, you should pass only a single value without an array.
8) If you use isSingleSelect prop, you can set showTags to false. It helps to show treeselect as a dropdown. Also you can disable selecting of group's nodes with help of disabledBranchNode.
9) If you use a large list of options and see a problem with performance, try to use isBoostedRendering prop.

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You can buy me a coffee if you want to support my work. Thank you!