Component helpers
All components have various function helpers, you also can use in projects.
isTrue
Checks if a value is Truthy or Falsy.
import { isTrue } from '@dnb/eufemia/shared/component-helper'isTrue(String | Boolean | Number) // returns Boolean
isTouchDevice
Checks if the target device has touch support.
import { isTouchDevice } from '@dnb/eufemia/shared/component-helper'isTouchDevice() // returns Boolean
toPascalCase
Transforms a string from snake_case to PascalCase.
import { toPascalCase } from '@dnb/eufemia/shared/component-helper'toPascalCase(String) // returns String
toCamelCase
Transforms a string from snake_case to camelCase.
import { toCamelCase } from '@dnb/eufemia/shared/component-helper'toCamelCase(String) // returns String
toSnakeCase
Transforms a string from PascalCase to snake_case.
import { toSnakeCase } from '@dnb/eufemia/shared/component-helper'toSnakeCase(String) // returns String
toKebabCase
Transforms a string from PascalCase to kebab-case.
import { toKebabCase } from '@dnb/eufemia/shared/component-helper'toKebabCase(String) // returns String
filterProps
Filters out unwanted entries from either an object or array.
import { filterProps } from '@dnb/eufemia/shared/component-helper'filterProps(props: Object|Array, remove*: Object|Array|Function, allowed*: Object|Array|Function) // returns Object|Array
* Optional values (defaults)
- remove = null
- allowed = null
makeUniqueId
Creates a truly unique hash.
import { makeUniqueId } from '@dnb/eufemia/shared/component-helper'makeUniqueId(prefix*: String, length*: Number) // returns String
* Optional values (defaults)
- prefix = ''
- length = 8
slugify
Breaks down phrases of words to be URI compatible. Removes special characters.
import { slugify } from '@dnb/eufemia/shared/component-helper'slugify(String) // returns String
checkIfHasScrollbar
Checks if an element has a scrollbar.
import { checkIfHasScrollbar } from '@dnb/eufemia/shared/component-helper'checkIfHasScrollbar(HTMLElement) // returns Boolean
convertJsxToString
Converts one or more HTMLElements to a string.
import { convertJsxToString } from '@dnb/eufemia/shared/component-helper'convertJsxToString(element: HTMLElement, separator*: String) // returns String
* Optional values (defaults)
- separator = undefined
InteractionInvalidation
InteractionInvalidation
Invalidates DOM elements to be accessible for a keyboard or a screen reader. Is used by the Modal.
Options
Use an object with these optional parameters:
tabIndex
: boolean (defaults to true) to disabletabindex
invalidation.ariaHidden
: boolean (defaults to true) to disablearia-hidden
invalidation.
Example
import { InteractionInvalidation } from '@dnb/eufemia/shared/component-helper'const instance = new InteractionInvalidation()// do not invalidate inside hereinstance.setBypassSelector('.dnb-modal__content *')// Enable the invalidationinstance.activate()// Optionally – you set a element selector – instead effecting everything inside the bodyinstance.activate('.selector')// Remove the invalidationinstance.revert()
General helpers
scrollToLocationHashId
Enhance the native anchor scroll handling by providing additional features like a custom offset.
import { scrollToLocationHashId } from '@dnb/eufemia/shared/helpers'// in case there is a #hash in the urlconst elem = scrollToLocationHashId({offset: 100,delay: 100,onCompletion: (elem) => {try {elem.classList.add('focus')} catch (e) {//}},}) // returns HTMLElement
* Optional values (defaults)
- offset = 0
- delay = null
- onCompletion = null
getOffsetTop
Get the HTML Element offset to the top of the browser window, minus offset
.
import { getOffsetTop } from '@dnb/eufemia/shared/helpers'getOffsetTop(element: HTMLElement) // returns Number
applyPageFocus
More info about that function in the focus section about better accessibility. Used together with setPageFocusElement.
import { applyPageFocus } from '@dnb/eufemia/shared/helpers'applyPageFocus(selector*: String, callback*: Function)
* Optional values (defaults)
- selector = 'default' (can be a HTML element selector, starting with a
.
or#
) - callback = null
setPageFocusElement
More info about that function in the focus section about better accessibility.
import { setPageFocusElement } from '@dnb/eufemia/shared/helpers'setPageFocusElement(selectorOrElement: String|HTMLElement, key*: String) // returns Void
* Optional values (defaults)
- key = ''
debounce
Creates a debounced function that delays invoking func until after wait milliseconds have elapsed since the last time the debounced function was invoked. The debounced function comes with a cancel
method to cancel delayed func invocations.
import { debounce } from '@dnb/eufemia/shared/helpers'const debounceFunc = ({ foo }) => { ... }const debounced = debounce(debounceFunc,wait = 500, // milliseconds{immediate = false, // execute the debounceFunc on the leading end} = {},)debounced({ foo: 'bar'}) // delay the execution – againdebounced.cancel() // optional, cancel the execution
Async example:
import { debounceAsync } from '@dnb/eufemia/shared/helpers'async function debounceFunc({ foo }) {// optionally, add a cancel event (wasCanceled is a "function" to check later if it was canceled)const wasCanceled = this.addCancelEvent(myCancelMethod)await wait(1000) // do something async}const myCancelMethod = () => {console.log('canceled')}const debounced = debounceAsync(debounceFunc,(wait = 500), // milliseconds)debounceAsync({ foo: 'bar' }) // delay the execution – againdebounced.cancel() // optional, cancel the executiondebounced.addCancelEvent(myCancelMethod) // alternatively, you can add the cancel event like so
In order to use this.addCancelEvent
you need to use a function()
, and not an arrow function.
copyToClipboard
Copies the given string to the device's clipboard.
import { copyToClipboard } from '@dnb/eufemia/shared/helpers'copyToClipboard(string) // returns success: String|Boolean|Error
Device functions
Function | Description | Parameters | Return |
---|---|---|---|
isEdge | Returns true or false, depending on the detection. | none | Boolean |
isSafari | Returns true or false, depending on the detection. | none | Boolean |
isiOS | Returns true or false, depending on the detection. | none | Boolean |
isMac | Returns true or false, depending on the detection. | none | Boolean |
isWin | Returns true or false, depending on the detection. | none | Boolean |
isLinux | Returns true or false, depending on the detection. | none | Boolean |
Device constants
Constant | Description | Value |
---|---|---|
IS_EDGE | Gives you true or false, depending on the detection during startup. | Boolean |
IS_SAFARI | Gives you true or false, depending on the detection during startup. | Boolean |
IS_IOS | Gives you true or false, depending on the detection during startup. | Boolean |
IS_MAC | Gives you true or false, depending on the detection during startup. | Boolean |
IS_WIN | Gives you true or false, depending on the detection during startup. | Boolean |
IS_LINUX | Gives you true or false, depending on the detection during startup. | Boolean |