helper-js

helper-js

js functions, just import needed functions.
js 方法库, 按需使用

// install
npm install helper-js -S

usage 使用

import {function1, function2} from 'helper-js'

some functions. pls check source to get more 常用方法, 请查看源码获取更多方法

glb() // get global cross environment

isset

typeof v !== 'undefined'

isArray

Object.prototype.toString.call(v) === '[object Array]'

isBool

isNumber

isNumeric

isString

isObject

isFunction

isPromise

numRand (min, max) // get a rand integer, include min and max

numPad(num, n)

(10, 3) => '010', (2, 4) => '0002'

min(n, min)

(1, 10) => 10, (11, 10) => 11

max(n, max)

(1, 10) => 1, (11, 10) => 10

studlyCase

hello => Hello

kebabCase

helloWorld nice => hello-world-nice

snakeCase

helloWorld nice => hello_world_nice

camelCase

helloWorld nice => helloWorldNice

camelToWords

helloWorldNice => hello World nice

titleCase

helloWorldNice => Hello World Nice

strRand (len = 8, prefix = '')

replaceMultiple (mapObj, str)

({'1': '2', '3': '4'}, 'abcd1234') => 'abcd2244'

arrayRemove (arr, item) // remove any === item

newArrayRemoveAt (arr, index/indexes) // remove by index or indexes, return new array

arrayAt(n) // n can less than 0

arrayFirst

arrayLast(arr)

arrayDiff (arr1, arr2) // return items in arr2 but not in arr1

arraySibling (arr, item, Number/Array offset) // return sibling or siblings relative to item

toArrayIfNot

splitArray(arr, n) // n can be getter(number of times); n可以是方法, 参数1是第几次分块

groupArray(arr, getMark)

arrayDistinct(arr)

arrayGet(arr, index, endIndex) // index can be negative number; 索引可为负

arrayWithoutEnd(arr, len)

assignIfDifferent(obj, key, val)

objectMerge (obj1, obj2) // merge obj2 to obj1, and merge obj2 chldren to obj1 if it is object

objectMap (obj, func)

objectOnly (obj, keys) // return new object

objectExcept (obj, keys) // return new object

forAll(val, handler) // loop array, object or integer, return false in handler can break loop

handler(item, index/key)

* iterateALL(val, opt = {}) // loop for Array, Object, NodeList, String

• opt {reverse}

objectGet (obj, path, throwError = false) // get by dot path

({a:{b:1}}, 'a.b') => 1

objectSet (obj, path, value)

unset (obj, prop)

cloneObj (obj, exclude) // can clone one-level object. exclude: array or function

mapObjectTree(obj, handler, limit=10000) // can clone whole object tree, can traverse every node, can exclude nodes

return cloned obj
handler(value, key, parent)
handler can return null or an object.
null: don't change anything
object{
  key: false, // delete. Deprecated, this will be removed in future, please use `delete` instead of it.
  key: new key, // use a new key instead of old key. if key == null, the old key will be detected
  delete,
  value, // new value. if value not gived, the old value will be detected
  skip, // skip children
  stop,
}
{key: false}: delete
{value}: change value
{key, value}. change key and value
limit: to prevent circular reference.

mapObjects(arr, idKey) // idKey can be function which return a key

idKey(item, i)
eg: mapObjects([{id: 1}, {id:2}], 'id') -> {'1':{id:1},'2':{id:2}}
eg: mapObjects([{id: 1}, {id:2}], (item, i) => item.id + 100 ) -> {'101':{id:1},'102':{id:2}}

pairRows(rows1, rows2, key1, key2 = key1)

depthFirstSearch(obj, handler, childrenKey = 'children', reverse) // 深度优先遍历; Depth-First-Search

handler(node, index, parent)
  return 'skip children', 'skip siblings', false // retrun false to stop

walkTreeData = depthFirstSearch

getNodeByPathFromTreeData(indexes, rootData, childrenKey='children') // rootData is Array

resolveValueOrGettter(valueOrGetter, args = []) // return first arg directly if is not function, else return function result

executeWithCount (func, context = null) // wrap function, the first arg of func is excuted count

watchChange (getVal, handler) // wrap getter function, when use getter to get value, it will check value if changed

executeOnceInScopeByName (name, action, scope = store_executeOnceInScopeByName, storeResult)

debounce(action, wait = 0, opt = {}) // return newAction, newAction's scope is same with action, its arguments will be passed to action. newAction.stop: function, to stop timeout

opt: {
  immediate: false,
}

debounceTrailing(action, wait = 0)

debounceImmediate(action, wait = 0)

joinMethods(methods, mode = 'value') // mode: value, pipline

joinFunctionsByResult(funcs) // the returned function only accept one argument

joinFunctionsByNext(funcs) // must pass arguments to next manually

executePromiseGetters(getters, concurrent = 1) // return {promise, destroy}

promiseTimeout(promise, timeout) // timeout unit is millisecond. return a new promise, which throw error named 'timeout' if timeout

getUrlParam // get current url param by name

DOM

createElementFromHTML(htmlString) // return NodeList if there are multiple top-level nodes

uniqueId (prefix = 'id_') // html element id

isDescendantOf (el, parent) // if el === parent or is descendant of parent

removeEl (el)

getScroll // return {left, top}

getOffset(el) // offset is relative to top element, return {x, y}

getOffsetParent (el) // there is some trap in el.offsetParent, so use this func to fix

getPosition (el) // get el current position. like jQuery.position

getPositionFromOffset (el, offset) // get position of a el if its offset is given. like jQuery.offset.

getBoundingClientRect (el) // get size and position relative to viewport, return {top, right, bottom, left, width, height, x, y}

getViewportPosition = getBoundingClientRect

viewportPositionToOffset (position) // return {x, y}

offsetToViewportPosition(offset) // return {x, y}

findParent (el, callback, opt={withSelf: false}) // callback return 'break' to break loop

backupAttr (el, name)

restoreAttr (el, name)

hasClass (el, className)

addClass (el, className)

removeClass (el, className)

getElSize (el)

isOffsetInEl (x, y, el)

getBorder (el) // return {left, top, right, bottom}

setElChildByIndex

getCss3Prefix(opt) // return -webkit-, -moz-, -o-, -ms-, ''

opt: {
  noCache: false,
}

onDOM (el, name, handler, ...args) // addEventListener

offDOM (el, name, handler, ...args) // removeEventListener

onDOMMany(els, names, handler, ...args) // return destroy

getImageSizeByUrl(url) // return promise {width, height}

findNodeList(list, callback, opt = {reverse})

findNodeListReverse(list, callback, opt = {})

elementsFromPoint(...) // document.elementsFromPoint

getOuterAttachedHeight(el, opt={margin: true, border: true}) // get margin and border

getOuterAttachedWidth(el, opt={margin: true, border: true}) // get margin and border

insertBefore(el, target)

insertAfter(el, target)

prependTo(el, target)

appendTo(el, target)

binarySearch (arr, callback, start, end, returnNearestIfNoHit, max = 1000) // binary search 二分查找

// callback(mid, i) should return mid - your_value

windowLoaded // return a promise

waitTime(milliseconds, [callback: optional]) // return a promise

waitFor (name, condition, time = 100, maxCount = 1000)

retry (func, limitTimes = 3)

copyTextToClipboard (text) // tested in chrome

jquery

jqFixedSize

jqMakeCarousel

openWindow(url, name, opt = {})

openCenterWindow(url, name, width, height, opt = {})

class URLHelper // now just for generate url

[recommend]resolveArgsByType(args, types) // for function overload

types eg: ['Object', (i) => i > 3, ['Number', default] ]
resolveArgsByType([1,'str'], ['Number', 'Boolean' ,'String']) -> [1, null, 'str']
resolveArgsByType([1,'str'], ['Number', ['Boolean', true] ,'String']) -> [1, true, 'str']
check source code to learn more

makeStorageHelper(storage) // make localStorage or sessionStorage can use json as value and has expiry

getLocalStorage2 //

getSessionStorage2 //

class EventProcessor

class CrossWindowEventProcessor // cross window(same domain) event processor

const cwep = new CrossWindowEventProcessor()
// CrossWindowEventProcessor has a default name; communicate in same-name instances.
// don't create more than one same-name instances in one window
// set different name if there are more than one same-name instances
cwep.storageName = '_crossWindow_channel2'
// functions
// on, once, off: same to EventProcessor
// emitTo(name, targets, ...args)
// emitLocal(name, ...args) emit to current window
// broadcast(name, ...args) emit to other windows
// emit(name, ...args) emit to all windows

class CrossWindow = CrossWindowEventProcessor // Deprecated in next version

onQuickKeydown(handler, opt) // to get quick inputed text 获得用户短时间内连续输入的字符串

getUserLanguage() // get user browser language

class Cache

attachCache(obj, toCache, cache = new Cache()) // attach cached getters to an object; can attach to self