JavaScript implementation of Sieve of Eratosthenes.

check HTML text input field to see if the value is integer.

Given the url of Instagram profile picture, return the url of profile picture in full size.

Find set differecne of two arrays, i.e., the elements in one array but not in the other, in JavaScript.

Find the set of all elements (union) in two arrays in JavaScript.

Find common elements (matches, intersection) of two arrays in JavaScript.

When web pages are rendered with JavaScript, how to wait until the DOM nodes of original contents are available for appending our nodes?

Convert specific texts to clickable links (<a> tag) in HTML document via JavaScript.

Append text at the beginning of each line via JavaScript.

Show tooltip when the cursor hovers over the text, and close the tooltip with delay if the cursor is not in the tooltip via JavaScript.

Simple tooltip implementation via JavaScript.

Show annotatoin (note) on mouse hovering over text. Used to help users read ancient Buddhist texts.

DOM manipulation - traverse all sibling elements or nodes via JavaScript.

Tab panel implementation via JavaScript and CSS.

Accordion (collapsible content) implementation via JavaScript.

Modal (Popup) implementation via JavaScript and CSS. Modal is dialog box/popup window that is displayed on top of the current page.

Traverse DOM tree to grab visible texts on webpage via JavaScript.

Traverse DOM tree to find out all text nodes via JavaScript.

Test Text-to-Speech feature in Web Speech API. Not working in Chromium 57, but OK in Firefox 53.

Exercise to draw 3x3 grid of dots via Canvas.

My favorite way to empty an array in JavaScript and why.

JSONP example - show your HTTP request headers.

Sequential typing text effect by JavaScript.

Parallel typing text effect by JavaScript.

Quiz will appear at the end of YouTube video.

Show youtube video if users pass the quiz.

Toggle (Show/Hide) HTML DOM element in JavaScript.

Detect arrow keystrokes via event.key of KeyboardEvent in JavaScript.

Virtual kayboard/keypad in vanilla JavaScript. Used in Pāli Dictionary.

Implementation of setting feature in web application via JSON, Web Storage (localStorage), and JavaScript.

Generate a random string from [a-z0-9] in JavaScript.

Example of accessing browser URL via JavaScript window.location.

Change browser URL without reloading web pages - Example for how to use HTML history API.

Search Taobao.com.

Custom 404 page for GitHub Pages. In the 404 page, a redirect link is created based on the current URL path.

Copy content of textarea to clipboard via JavaScript.

Search PTT BBS.

Search links of major search engines - Google, DuckDuckGo, Bing, Yahoo, Baidu, Yandex, Ecosia, Qwant.

Wrap Pāli words in span element via regular expression and JavaScript.

Find photos of me on Facebook.

Conversion Button of Traditional/Simplified Chinese on Website via JavaScript.

Make font size of your website larger/smaller via JavaScript.

Fix the bug in succinct trie implementation of Bits.js - Wrong trie insertion if words are not inserted in alphabetical order.

Parse Accept-Language in HTTP Request Header in JavaScript Programming Language.

Cross-domain requests by JSONP with object instance function as callback on Google App Engine for Python.

Cross-domain requests by JSONP with anonymous callback function on Google App Engine for Python.

Cross-domain requests by JSONP on Google App Engine for Python.

Demonstrate how to make an online 0-9 keypad, which is draggable via jQuery and toggleable via vanilla JavaScript.

Hide div element when clicked outside it, in vanilla JavaScript way. No jQuery or libraries are used.

Dropdown menu using vanilla JavaScript. No jQuery or libraries are used.

Toggle sound on click event of DOM element.

Load CSS file dynamically.

Remove leading and trailing whitespaces of a string in JavaScript.

Play sound on click event of DOM element.

JavaScript cross-browser HTTP POST request

JavaScript cross-browser HTTP GET request

Check DOM readiness in vanilla JavaScript.

JavaScript library New Tong Wen Tang for conversion of Traditional and Simplified Chinese.

Use onmousedown event instead of onclick event if the event handler to be fired before onblur event.

Load website icon (favicon) dynamically.

JavaScript equivalent of basename program.

JavaScript Cross-Browser Implementation of onMouseEnter and onMouseLeave Event

Change the scope (context) of anonymous function - change what this keyword refers to in anonymous function.

Discuss the scope (context) of event handler and how to change what this keyword refers to.

Detect the content change of HTML input elements in a cross-browser and consistent manner.

JavaScript single callback for multiple asynchronous XHR requests.

Redirect users to another website if the website is available.

JavaScript equivalent of Python string startswith, endswith, and contains.

Create DOM elements by JavaScript.

Bug-free way of removing child nodes of a DOM element in JavaScript.

Cross-domain AJAX requests

1% width of browser window equal to how many pixels?

Width of browser window in pixel.

Compare mouseenter, mouseleave, mouseover, and mouseout events.

Load JavaScript scripts dynamically with dependencies.

Send/receive data to/from Google App Engine Python servers by HTTP POST requests in AJAX way.

Draggable, movable HTML element using vanilla JavaScript.

Rich text editor with math equation dialog using Google Closure Library.

Get DOM element position (including scroll position) using JavaScript.

JavaScript Back to Top Link

Detect arrow keystrokes in JavaScript.

Event target element in JavaScript event handling.

Load JavaScript or CSS on demand.

Given a set of strings (words), and an user input string, output a set of strings with prefix the same as the user input string