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writing Javascript

Riki Fridrich fczbkk

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writing Javascript
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@fczbkk
fczbkk / array.indexOf.coffee
Created February 24, 2014 04:27
Polyfil for Array.indexOf in IE8-. Based on https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf
unless Array::indexOf
Array::indexOf = (search_element, from_index) ->
throw new TypeError '"this" is null or not defined' unless this?
length = @length >>> 0 # Hack to convert object.length to a UInt32
from_index = +from_index or 0
from_index = 0 if Math.abs(from_index) is Infinity
if from_index < 0
from_index += length
@fczbkk
fczbkk / emulate-click-event.coffee
Last active August 29, 2015 14:03
Emulates click event, very useful when testing UI features.
simulateClick = (elm) ->
evt = document.createEvent 'MouseEvents'
evt.initMouseEvent(
# type, canBubble, cancelable, view,
'click', true, true, window
# detail, screenX, screenY, clientX, clientY,
0, 0, 0, 0, 0
# ctrlKey, altKey, shiftKey, metaKey,
false, false, false, false
# button, relatedTarget
@fczbkk
fczbkk / ajax.coffee
Created July 25, 2014 06:46
ajax = (url, callback = ->) ->
xhr = new XMLHttpRequest()
xhr.onreadystatechange = ->
if xhr.readyState is 4
if xhr.status in [200, 304]
callback xhr.responseText
xhr.open 'GET', url, true
xhr.send()
@fczbkk
fczbkk / class-names.coffee
Created July 25, 2014 06:57
Bridge for working with element classes (has, add, remove). It would be much easier to use `element.classList` (https://developer.mozilla.org/en-US/docs/Web/API/Element.classList), but unfortunately, Internet Explorer forgot to implement it until version 10.
getClassNameRe = (classname) ->
///
(^|\s) # beginning of string or whitespace
#{classname}
(\s|$) # end of string or whitespace
///
hasClassName = (element, classname) ->
getClassNameRe(classname).test element.className
@fczbkk
fczbkk / is_array.coffee
Created August 24, 2014 05:07
Cross browser bridge to check, if provided object is an array.
isArray = Array.isArray or (obj) -> Object::toString.call obj is '[object Array]'
@fczbkk
fczbkk / coder-test.js
Created November 12, 2012 13:10
Kóderský test
var rootElm = document.getElementById('content');
var paragraphs = rootElm.getElementsByTagName('p');
for (i = 0; i < paragraphs.length; i++) {
rootElm.removeChild(paragraphs[i]);
}
/*
OTÁZKY
- Čo chcel autor týmto kódom dosiahnuť?
@fczbkk
fczbkk / event-bridge.coffee
Last active December 12, 2015 05:28
Simple bridge pattern to unify event listeners between IE and the standard way.
addEvent = (object, event, callback = ->) ->
if object.addEventListener
object.addEventListener event, callback, false
else if object.attachEvent
object.attachEvent "on#{event}", callback
removeEvent = (object, event, callback = ->) ->
if object.removeEventListener
object.removeEventListener event, callback, false
else if object.detachEvent
@fczbkk
fczbkk / get-random-string.js
Created March 25, 2013 12:29
Generates a random string and returns them or sends it to callback. Great for generating unique identifiers.
/*
Has two optional options parameters:
- length - 8 characters by default
- characters - upper- and lowercase characters and numbers by default
*/
function getRandomString(options, callback) {
options = options || {};
options.length = options.length || 8;
options.characters = options.characters || '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz';
@fczbkk
fczbkk / merge-url-params.coffee
Created November 14, 2013 10:23
Merges provided list of parameters and their values into a string usable in URL.
mergeUrlParams = (params = {}) -> ("#{key}=#{val}" for key, val of params).join '&'
@fczbkk
fczbkk / test1.html
Last active January 13, 2016 15:16
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<div>
<p id="myElement">First paragraph.</p>