@kluntje/js-utils
Advanced tools
Kluntje/js-utils is a collection of really usefull js functions that can be imported in any project and speed up your daily javascript tasks.
npm install @kuntje/js-utils
import { inViewport } from '@kluntje/js-utils/lib/dom-helpers';
const inView = inViewport(document.querySelector("#teaser"));
// You can also import from top level. But this is not suitable for three shaking!
import { domHelpers } from "@kluntje/js-utils";
const inView = domHelpers.inViewport(document.querySelector("#teaser"));
Promise.<T>Calls API and returns JSON as Promise
booleanchecks, if element is in given array
booleanchecks, whether given Array exists and has at least one element
Array.<T>merge two given arrays by the given checker function
Array.<T>pushes new Element to given array, if its not already in it
Array.<T>removes specific Item from array and return new array
DateAdds given amount of days to given date
stringOptionally Adds leading Zero to Numbers < 10
booleanChecks whether given dates are equal
stringHelper to make date parsing cross browser compatible Some browsers (e.g. Safari) need the GMT offset part to be in format "+00:00" This helper makes sure that any present GMT offset follows that format and can safely be parsed: Date.parse("2020-01-01T12:13:14.000+0200") // throws error in Safari Date.parse("2020-01-01T12:13:14.000+02:00") // succes
adds given classes to one or multiple elements
Element | nullreturns the first child of a specific parent matching the given selector
Array.<Element>returns all children of a specific parent matching the given selector
stringreturns current mediaQuery-name. e.g. "MQ2"
stringreturns innerText of given Element
Element | nullreturns parent of specific class, if found
stringreturns a random String to be used as ID
booleanreturns if a specific parent has a child matching the given selector
booleanreturns if a specific element has given class
booleanchecks, whether an element is in the viewport
booleanchecks, if target is NodeList
adds event with given parameters
removes all children of a specific parent matching the given selector
removes given class from element
removes event with given parameters
toggles given class on given element
Promise.<void>resolves Promise after given timeout
Promisereturns a promise which resolves after the animationend event
Promise.<void>waits for given event for a (optional) max-timeout
Promise.<void>Promise that resolves, when the given component is initialized
Promisereturns a promise which resolves after the transitionend event
functionreturns a debounced function which when called multiple of times each time it waits the waiting duration and if the method was not called during this time, the last call will be passed to the callback.
functiongenerates a decorator factory for the provided helper function.
helper function should have this signature: (Function, ...args: any[]) => Function
functionreturns a throttled function which when called, waits the given period of time before passing the last call during this time to the provided callback.
call .cancel() on the returned function, to cancel the callback invocation.
*returns nested value without throwing an error if the parent doesn't exist
booleancompare two arguments, for object their toString values are compared
booleanchecks if provided argument is an object which has at least one entry in it.
Nullable.<T> | Array.<T>returns a deep link of the provided argument
Array.<T>returns the argument wrapped in an array if it isn't array itself
stringreturns stringified value for the given argument
stringremoves all multi Whitespaces and Newlines in given string
numberreturns number of words in a given text
stringremoves all Whitespaces in given string
stringremoves all Newlines in given string
stringremoves multi Whitespaces in given string
stringfunction to convert texts to camelCase for example ti generate attribute names
stringconverts the provided string to a kebab case (kebab-case)
stringEnsures that the given url has an http protocol. If the url does not have an http protocol, it will be prepended with https://. If the url already has an http protocol, it will be returned as is. If the protocol should be http instead of https, you can pass in the optional parameter useHttp as true.
stringreturns a string without the http or https protocol
functioniterates over all nodes in a node list (necessary because IE11 doesn't support .forEach * for NodeLists)
Promise.<T>Calls API and returns JSON as Promise
Kind: global function
| Param | Type |
|---|---|
| url | string |
| [options] | RequestInit |
Example
// use with async/await
const myApiResponse = await fetchJSON("https://some.api/path")
Example
// use as normal promise
fetchJSON("https://some.api/path").then((data) => console.log("myData:", data));
booleanchecks, if element is in given array
Kind: global function
| Param | Type |
|---|---|
| array | Array.<T> |
| element | T |
Example
const fruits = ["Banana", "Orange", "Apple", "Mango"];
if (hasElement(fruits, "Apple")) {
console.log("You got an Apple");
}
booleanchecks, whether given Array exists and has at least one element
Kind: global function
| Param | Type |
|---|---|
| array | Array.<T> |
Example
const myBooks = await fetchJSON("https://my-book-store.api/books");
if (isFilledArray(myBooks)) {
console.log(`${myBooks.length} Books found!`)
} else {
console.log("Sorry, no Books found");
}
Array.<T>merge two given arrays by the given checker function
Kind: global function
| Param | Type | Description |
|---|---|---|
| array1 | Array.<T> | |
| array2 | Array.<T> | |
| checker | function | if this function returns true for a specific element combination the elements are getting merged |
Example
const defaultUsers = [
{
name: "Admin",
mail: "admin@company.com"
},
{
name: "CI",
mail: "ci@company.com"
}
];
const projectUsers = [
{
name: "Admin",
mail: "admin@company.com"
},
{
name: "User1",
mail: "user-one@company.com"
},
{
name: "User2",
mail: "user-two@company.com"
}
];
const userList = mergeArraysBy(defaultUsers, projectUsers, (defaultUser, array) => {
return !array.some((projectUser) => projectUser.mail === defaultUser.mail)
})
// userList
// [
// {
// "name": "CI",
// "mail": "ci@company.com"
// },
// {
// "name": "Admin",
// "mail": "admin@company.com"
// },
// {
// "name": "User1",
// "mail": "user-one@company.com"
// },
// {
// "name": "User2",
// "mail": "user-two@company.com"
// }
// ]
Array.<T>pushes new Element to given array, if its not already in it
Kind: global function
| Param | Type |
|---|---|
| array | Array.<T> |
| newElement | T |
Example
const fruitStore = ["Banana", "Orange", "Apple", "Mango"];
const newFruit = getInputValue(...)
const newFruitStore = pushIfNew(fruitStore, newFruit);
Array.<T>removes specific Item from array and return new array
Kind: global function
| Param | Type |
|---|---|
| array | Array.<T> |
| itemToRemove | T |
Example
const fruitStore = ["Banana", "Orange", "Apple", "Mango"];
const newFruitStore = removeItem(fruitStore, "Apple"); // ["Banana", "Orange", "Mango"]
DateAdds given amount of days to given date
Kind: global function
| Param | Type | Default | Description |
|---|---|---|---|
| date | Date | ||
| daysToAdd | number | ||
| [zeroHours] | boolean | false | set time to 0:00:00 |
Example
const today = new Date();
const tomorrow = addDays(today, 2);
stringOptionally Adds leading Zero to Numbers < 10
Kind: global function
| Param | Type |
|---|---|
| inNumber | number |
Example
const today = new Date();
const formattedDateSting = `${addLeadingZero(today.getDate())}.${addLeadingZero(today.getMonth() + 1)}.${today.getFullYear()}`;
booleanChecks whether given dates are equal
Kind: global function
| Param | Type |
|---|---|
| dateA | Date |
| dateB | Date |
Example
const dateA = new Date(2020, 1, 29, 22, 30);
const dateB = new Date(2020, 1, 29, 18, 20);
isEqualDate(dateA. dateB); // true
stringHelper to make date parsing cross browser compatible Some browsers (e.g. Safari) need the GMT offset part to be in format "+00:00" This helper makes sure that any present GMT offset follows that format and can safely be parsed: Date.parse("2020-01-01T12:13:14.000+0200") // throws error in Safari Date.parse("2020-01-01T12:13:14.000+02:00") // succes
Kind: global function
Returns: string -
correctly formatted date
| Param | Type | Description |
|---|---|---|
| date | string | date string to be sanitized for parsing |
Example
sanitizeDateGMTOffset("2020-01-01T12:13:14.000+0200") // "2020-01-01T12:13:14.000+02:00"
adds given classes to one or multiple elements
Kind: global function
| Param | Type |
|---|---|
| elements | Element | Iterable.<Element> | NodeListOf.<Element> | null |
| ...classNames | string |
Example
const button = document.querySelector('.button');
addClass(button, 'my-button');
Example
const inputs = document.querySelectorAll('input');
addClass(inputs, 'my-button');
Element | nullreturns the first child of a specific parent matching the given selector
Kind: global function
| Param | Type |
|---|---|
| parent | Element | Document | null |
| selector | string |
Example
const input = find(document, 'input');
Array.<Element>returns all children of a specific parent matching the given selector
Kind: global function
| Param | Type |
|---|---|
| parent | Element | Document | null |
| selector | string |
Example
const inputs = findAll(document, 'input');
Kind: global function
| Param | Type |
|---|---|
| node | Node |
| index | Number |
| nodeList | NodeListOf.<T> |
stringreturns current mediaQuery-name. e.g. "MQ2"
Kind: global function
Returns: string -
| Param | Type |
|---|---|
| mediaQueries | Array.<MQDefinition> |
Example
const myMqs = [
{
name: 'MQ2',
query: '(min-width: 769px)'
},
{
name: 'MQ1',
query: '(min-width: 0px)'
}
];
const curMQ = getCurrentMQ(myMqs);
stringreturns innerText of given Element
Kind: global function
| Param | Type |
|---|---|
| el | HTMLElement |
Example
const myArticle = document.querySelector('article');
const articleText = getInnerText(myArticle);
Element | nullreturns parent of specific class, if found
Kind: global function
| Param | Type |
|---|---|
| element | Element |
| parentSelector | string |
Example
const myText = document.querySelector('p');
const myArticle = getParent(myText, 'article');
stringreturns a random String to be used as ID
booleanreturns if a specific parent has a child matching the given selector
Kind: global function
| Param | Type |
|---|---|
| parent | Element |
| childSelector | string |
Example
const article = document.querySelector('article');
if (hasChild(article, '.cta')) console.log('please click');
booleanreturns if a specific element has given class
Kind: global function
| Param | Type |
|---|---|
| element | Element |
| className | string |
Example
const cta = document.querySelector('button');
if (hasClass(cta, 'primary')) console.log("primary")
booleanchecks, whether an element is in the viewport
Kind: global function
| Param | Type |
|---|---|
| element | Element |
| [parent] | Element |
Example
const image = document.querySelector('image');
if (inViewport(image)) image.setAttribute('src', image.dataset('src'));
booleanchecks, if target is NodeList
Kind: global function
| Param | Type |
|---|---|
| target | any |
adds event with given parameters
Kind: global function
| Param | Type |
|---|---|
| target | EventTarget | null |
| events | string | Array.<string> |
| handler | function |
| context | Context |
| [options] | AddEventListenerOptions |
Example
const buttons = findAll(document, 'button);
onEvent(buttons, 'click', () => console.log('button clicked'), this);
removes all children of a specific parent matching the given selector
Kind: global function
| Param | Type |
|---|---|
| parent | Element |
| selector | string |
Example
const article = find('article);
removeChildren(article, '.ad');
removes given class from element
Kind: global function
| Param | Type |
|---|---|
| elements | Element | Iterable.<Element> | NodeListOf.<Element> | null |
| ...classNames | string |
Example
const button = document.querySelector('.button');
removeClass(button, 'active');
Example
const inputs = document.querySelectorAll('input');
removeClass(inputs, 'active');
removes event with given parameters
Kind: global function
| Param | Type |
|---|---|
| target | HTMLElement | Iterable.<HTMLElement> |
| events | string | Array.<string> |
| handler | function |
| context | Context |
| [options] | AddEventListenerOptions |
Example
const buttons = findAll(document, 'button);
removeEvent(buttons, 'click', () => console.log('button clicked'), this);
toggles given class on given element
Kind: global function
| Param | Type |
|---|---|
| elements | Element | Iterable.<Element> | NodeListOf.<Element> | null |
| className | string |
| add | boolean |
Example
const button = find(document, 'button');
onEvent(button, 'click', () => toggleClass(button, 'active'), this);
Promise.<void>resolves Promise after given timeout
Kind: global function
| Param | Type | Description |
|---|---|---|
| timeout | number | timeout in milliseconds |
Example
addClass(button, 'animate');
waitFor(300).then(() => removeClass(button, 'animate'));
Example
addClass(button, 'animate');
await waitFor(300);
removeClass(button, 'animate');
Promisereturns a promise which resolves after the animationend event
Kind: global function
| Param | Type | Description |
|---|---|---|
| el | HTMLElement | SVGElement | DOM Element which has the css animation |
| [animationName] | string | keyframes' name. e.g. "slideOut" |
Example
el.classList.add("hide");
await waitForAnimationEnd(el, "fade-out");
el.parentElement.removeChild(el);
// css:
// .hide {
// animation: fade-out 0.5s forwards;
// }
Promise.<void>waits for given event for a (optional) max-timeout
Kind: global function
| Param | Type | Description |
|---|---|---|
| target | EventTarget | |
| eventName | string | |
| timeout | number | timeout in milliseconds |
Example
addClass(button, 'animate');
waitForEvent(button, 'transitionend', 500).then(() => removeClass(button, 'animate'));
Example
addClass(button, 'animate');
await waitForEvent(button, 'transitionend', 500);
removeClass(button, 'animate');
Promise.<void>Promise that resolves, when the given component is initialized
Kind: global function
| Param | Type |
|---|---|
| component | Component |
Example
waitForInitialization(my-input).then(() => my-input.value = 'Hello World');
Example
await waitForInitialization(my-input);
my-input.value = 'Hello World';
Promisereturns a promise which resolves after the transitionend event
Kind: global function
| Param | Type | Description |
|---|---|---|
| el | HTMLElement | SVGElement | DOM Element which has the css transition |
| [propertyName] | string | transition's propertyName. e.g. "width" |
Example
menu.classList.add("open");
await waitForTransitionEnd(menu, "transform");
input.classList.add("visible");
await waitForTransitionEnd(input, "opacity");
input.focus();
functionreturns a debounced function which when called multiple of times each time it waits the waiting duration and if the method was not called during this time, the last call will be passed to the callback.
Kind: global function
Debounce(100): scrollHandler(event) {
// ...
}
}
| Param | Type | Default | Description |
|---|---|---|---|
| callback | function | function to be called after the last wait period | |
| [wait] | number | 0 | waiting period in ms before the callback is invoked if during this time the debounced method was not called |
Example
const debounced = debounce(console.log, 500);
debonced("Hi");
debonced("Hello");
debonced("Hey");
if (neverMind) debonced.cancel();
// logs only "Hey", and when `neverMind === false`, doesn't log anything.
// or instead of decorator on class methods
Class Component {
constructor() {
window.addEventListener("resize", this.resizeHandler);
window.addEventListener("scroll", this.scrollHandler);
}
resizeHandler = debounce(event => {
// event handlers logic
}, 100);
// or when the decorator is imported:
functiongenerates a decorator factory for the provided helper function.
helper function should have this signature: (Function, ...args: any[]) => Function
Kind: global function
| Param | Type | Description |
|---|---|---|
| func | function | function to be wrapped with a decorator factory |
functionreturns a throttled function which when called, waits the given period of time before passing the last call during this time to the provided callback.
call .cancel() on the returned function, to cancel the callback invocation.
Kind: global function
| Param | Type | Default | Description |
|---|---|---|---|
| callback | function | function to be caled after the last wait period | |
| [wait] | number | 0 | waiting period in ms before the callback is invoked if during this time the debounced method was not called |
Example
window.addEventListener("resize", throttle(updateSlider, 100));
*Deprecated
returns nested value without throwing an error if the parent doesn't exist
Kind: global function
Returns: * -
| Param | Type | Description |
|---|---|---|
| obj | Object | object to be looked for value |
| path | string | a string with dot separated levels: e.g "a.b" |
Example
const obj = {
a: {
b: {
c: 1
},
d: true
}
};
getValue(obj, "a.b") === {c: 1};
getValue(obj, "a.f") === undefined;
booleancompare two arguments, for object their toString values are compared
Kind: global function
| Param | Type |
|---|---|
| arg1 | T |
| arg2 | T |
Example
if (!isEqual(oldState, newState)) console.log('state changed');
booleanchecks if provided argument is an object which has at least one entry in it.
Kind: global function
| Param | Type |
|---|---|
| obj | any |
Example
isFilledObject({ k: "v" }) === true;
isFilledObject({}) === false;
isFilledObject("text") === false;
Nullable.<T> | Array.<T>returns a deep link of the provided argument
Kind: global function
| Param | Type |
|---|---|
| arg | Nullable.<T> | Array.<T> |
Example
const state = naiveClone(initialState);
Array.<T>returns the argument wrapped in an array if it isn't array itself
Kind: global function
| Param | Type |
|---|---|
| arg | T | Array.<T> |
Example
const apple = "Apple";
const fruits = toArray(apple); // ["Apple"]
stringreturns stringified value for the given argument
Kind: global function
| Param | Type |
|---|---|
| arg | * |
Example
const submitData = toString(formData);
stringremoves all multi Whitespaces and Newlines in given string
Kind: global function
| Param | Type |
|---|---|
| inputString | string |
Example
const article = find(document, 'aricle');
const text = getCleanString(article.innerText);
numberreturns number of words in a given text
Kind: global function
| Param | Type |
|---|---|
| text | string |
Example
const article = find(document, 'aricle');
const articleWords = getWordCount(article.innerText);
stringremoves all Whitespaces in given string
Kind: global function
| Param | Type |
|---|---|
| inputString | string |
Example
removeAllBS('Hello My World '); // HelloMyWorld
stringremoves all Newlines in given string
Kind: global function
| Param | Type |
|---|---|
| inputString | string |
Example
const article = find(document, 'aricle');
const textString = removeAllNL(article.innerText);
stringremoves multi Whitespaces in given string
Kind: global function
| Param | Type |
|---|---|
| inputString | string |
Example
removeMultiBS('Hello My World'); // Hello My World
stringfunction to convert texts to camelCase for example ti generate attribute names
Kind: global function
| Param | Type | Description |
|---|---|---|
| str | string | sequence of letters, dashes and spaces to be converted to camelCase |
Example
toCamelCase("some-text") === "someText";
toCamelCase("some other text") === "someOtherText";
stringconverts the provided string to a kebab case (kebab-case)
Kind: global function
| Param | Type |
|---|---|
| str | string |
Example
toKebabCase("keyValuePair") === "key-value-pair"
stringEnsures that the given url has an http protocol. If the url does not have an http protocol, it will be prepended with https://. If the url already has an http protocol, it will be returned as is. If the protocol should be http instead of https, you can pass in the optional parameter useHttp as true.
Kind: global function
| Param | Type | Default |
|---|---|---|
| url | string | |
| useHttp | boolean | false |
Example
const url = 'https://www.google.com';
const result = ensureHttpProtocol(url);
console.log(result);
// => 'https://www.google.com'
const url = 'www.google.com';
const result = ensureHttpProtocol(url);
console.log(result);
// => 'https://www.google.com'
const url = 'http://www.google.com';
const result = ensureHttpProtocol(url);
console.log(result);
// => 'http://www.google.com'
stringreturns a string without the http or https protocol
Kind: global function
| Param | Type |
|---|---|
| url | string |
Example
const url = 'https://www.google.com';
const result = removeHttpProtocol(url);
console.log(result);
// => 'www.google.com'
functioniterates over all nodes in a node list (necessary because IE11 doesn't support .forEach * for NodeLists)
Kind: global typedef
| Param | Type | Default |
|---|---|---|
| nodeList | NodeListOf.<T> | |
| [context] | any | window |
Example
const buttons = document.querySelectorAll('button');
forEachNode(buttons, (button, idx) => addClass(button, `my-button--${idx}`))
š¤ Frederik Riewerts frederik.riewerts@gmail.com
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FAQs
Collection of js helper functions
We found that @kluntje/js-utils demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago.Ā It has 0 open source maintainers collaborating on the project.
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