Unescape HTML in JS
function htmlDecode(input){ var e = document.createElement('div'); e.innerHTML = input; return e.childNodes.length === 0 ? "" : e.childNodes[0].nodeValue; } Usage htmlDecode("<img...
View ArticleStrip Numbers from a String
var someString = "Hello 123 World!"; newString = someString.replace(/[0-9]/g, ''); // console.log(newString); // "Hello World!";
View ArticleRemove the Last Character from a String
var origString = 'Happy Dance7'; var trimmedString = origString.substring(0, origString.length-1); console.log(trimmedString); // 'Happy Dance'
View ArticleMove Cursor to End of Input
Where el is a reference to an input or textarea. function moveCursorToEnd(el) { if (typeof el.selectionStart == "number") { el.selectionStart = el.selectionEnd = el.value.length; } else if (typeof...
View ArticleCookie Getter/Setter
/** * Gets or sets cookies * @param name * @param value (null to delete or undefined to get) * @param options (domain, expire (in days)) * @return value or true */ _.cookie = function(name, value,...
View ArticleInject New CSS Rules
If you need to change the style of an element with JavaScript, it's typically better to change a class name and have the CSS already on the page take effect and change the style. However, there are...
View ArticleLighten / Darken Color
The CSS preprocessors Sass and LESS can take any color and darken() or lighten() it by a specific value. But no such ability is built into JavaScript. This function takes colors in hex format (i.e....
View ArticleStrip Whitespace From String
Whitespace, meaning tabs and spaces. // Remove leading and trailing whitespace // Requires jQuery var str = " a b c d e f g "; var newStr = $.trim(str); // "a b c d e f g" // Remove leading and...
View ArticleFix IE 10 on Windows Phone 8 Viewport
(function() { if (navigator.userAgent.match(/IEMobile\/10\.0/)) { var msViewportStyle = document.createElement("style"); msViewportStyle.appendChild(...
View ArticleTest if dragenter/dragover Event Contains Files
HTML5 drag and drop is great for handling file uploads. But if that's the only thing you are using it for, it's nice to know if any particular dragenter or dragover event actually has files. Unlike,...
View ArticleGet All Possible DOM Events
You can get an array of all the events that start with "on" (e.g. onclick) by running this in the Console of Firefox. [i for(i in document)].filter(function(i){return...
View ArticleCheck if font-family is Honored
function checkFont(strFamily) { var objDiv = document.createElement('div'); objDiv.style.fontFamily = strFamily; objDiv.appendChild(document.createTextNode('FONT TEST')); if (window.getComputedStyle) {...
View ArticlePrint Object To Screen
PHP has a nice print_r function for printing out information about a variable to the screen. console.log() is great for that in JavaScript also, but sometimes you just need/want to look at it on the...
View ArticleLoop Over querySelectorAll Matches
You can loop over Arrays really easily in JavaScript with forEach, but unfortunately it's not that simple with the results of a querySelectorAll. /* Will Not Work */...
View ArticleRemove an Element
For whatever reason, an element can't destroy itself in JavaScript. jQuery has a method for this, which is nice because this is how we think: $(".remove-me").remove(); But there is no direct equivalent...
View ArticleCross-Browser Dependency-Free DOM Ready
Denis Ciccale's version: var DOMReady = function(a, b, c) { b = document c = 'addEventListener' b[c] ? b[c]('DocumentContentLoaded', a) : window.attachEvent('onload', a) } DOMReady(function () {...
View ArticleConvert Polygon to Path Data
I've had to do this a few times recently so I thought I'd save the method. StackOverflow has a method that works great: [].forEach.call(polys,convertPolyToPath); function convertPolyToPath(poly){ var...
View ArticleSelect Random Item from an Array
var myArray = [ "Apples", "Bananas", "Pears" ]; var randomItem = myArray[Math.floor(Math.random()*myArray.length)]; (moreā¦)
View ArticleReplacements for setInterval Using requestAnimationFrame
When it comes to animation, we're told that setInterval is a bad idea. Because, for example, the loop will run regardless of anything else going on, rather than politely yielding like...
View ArticleAdd a Number to Two Variables At Once
You can initialize two variables to the same value at once, kinda: var foo, bar; foo = bar = 10; But there is no similarly easy mechanism to add, say, 5 to both foo and bar at the same time. Of course,...
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