Javascript
Some resources
- http://www.w3schools.com/js/
- http://eloquentjavascript.net/
- http://javascript.info/
- https://developer.mozilla.org/en-US/Learn/Getting_started_with_the_web/JavaScript_basics
- http://htmldog.com/guides/javascript/
- http://www.tizag.com/javascriptT/
- 6 Easiest Programming Languages to Learn for Beginners - JavaScript, Ruby on Rails, Python, Java, C/C++, C#.
- CS106J: Programming Methodologies in JavaScrip from Stanford University.
- TutorialsPoint
- Software Tools in JavaScript/Javascript for data science 2018
Book
- JavaScript and JQuery: Interactive Front-End Web Development by Jon Duckett
Editors
Top 5 Javascript Editors That Can Make Coding Much Easier: WebStorm (commercial), Visual Studio Code (cross platform, open source), Sublime text (cross platform), Atom Editor (cross platform), Brackets (cross platform)
Reload Javascript in browser/Empty Cache
How can I do a Cache Refresh in Google Chrome?
- For Windows and Linux: Shift+F5 or Ctrl+Shift+R
- For Mac: Cmd+Shft+R:
Firefox: Ctrl + F5. It seems F5 (refresh) is good enough from my testing.
Libraries
jQuery
How to Build a JavaScript SlideShow in 3 Easy Steps
jQuery UI
It is mentioned in Creating multi-tab reports with R and jQuery UI
D3
- https://d3js.org/, Gallery
- SOME SIMPLE TRICKS FOR CREATING RESPONSIVE CHARTS WITH D3. The d3.css link in index.html file needs to be changed to include https: protocol.
- Multi-line chart
- https://observablehq.com/@d3/multi-line-chart. Original one. X-axis = year.
- https://observablehq.com/@shaswat-du/d3-multi-line-chart. X-axis = continuous.
npm - node.js package manager
sudo apt-get install npm
npm install
https://docs.npmjs.com/cli/install
yarn
Package dependencies manager.
It's number 3 on brew requests.
Yarn has been used by paper-pi. See E-Ink Display for Daily News, Weather and More.
Less
Less is a CSS pre-processor, meaning that it extends the CSS language, adding features that allow variables, mixins, functions and many other techniques that allow you to make CSS that is more maintainable, themable and extendable.
Less runs inside Node, in the browser and inside Rhino.
Install/update npm - Node Package Manager
As you can see from the error message, the node in my Odroid ubuntu 14.04 system is kind of old. Since npm is part of node, we want to update node first. Fortunately node provides a binary for ARM system too.
$ npm install -g less npm http GET https://registry.npmjs.org/less npm http 304 https://registry.npmjs.org/less npm WARN engine [email protected]: wanted: {"node":">=0.12"} (current: {"node":"v0.10.25","npm":"1.3.10"}) $ # Install the current version of node/nodejs for my OS (ARM v7). $ wget https://nodejs.org/dist/v4.4.5/node-v4.4.5-linux-armv7l.tar.xz | tar xJ $ PATH=/home/odroid/Downloads/node-v4.4.5-linux-armv7l/bin:$PATH; export PATH
Install Less
$ # Method 1. Install less via npm. No sudo required $ # the '-g' option is to make the module avaiable globally instead of under the current directory $ npm install -g less /home/odroid/Downloads/node-v4.4.5-linux-armv7l/bin/lessc -> /home/odroid/Downloads/node-v4.4.5-linux-armv7l/lib/node_modules/less/bin/lessc [email protected] /home/odroid/Downloads/node-v4.4.5-linux-armv7l/lib/node_modules/less ├── [email protected] ├── [email protected] ├── [email protected] ├── [email protected] ├── [email protected] ([email protected]) ├── [email protected] ([email protected]) └── [email protected] ([email protected]) $ # Method 2. Install less via bow (depending on npm). No sudo required $ npm install -g bower /home/odroid/Downloads/node-v4.4.5-linux-armv7l/bin/bower -> /home/odroid/Downloads/node-v4.4.5-linux-armv7l/lib/node_modules/bower/bin/bower [email protected] /home/odroid/Downloads/node-v4.4.5-linux-armv7l/lib/node_modules/bower $ which bower /home/odroid/Downloads/node-v4.4.5-linux-armv7l/bin/bower $ bower install less bower not-cached https://github.com/less/less.git#* bower resolve https://github.com/less/less.git#* bower checkout less#v2.7.1 bower resolved https://github.com/less/less.git#2.7.1 bower install less#2.7.1 $ ls -l /home/odroid/Downloads/node-v4.4.5-linux-armv7l/bin total 21740 lrwxrwxrwx 1 odroid odroid 35 Jun 12 07:23 bower -> ../lib/node_modules/bower/bin/bower lrwxrwxrwx 1 odroid odroid 34 Jun 12 07:32 lessc -> ../lib/node_modules/less/bin/lessc -rwxr-xr-x 1 odroid odroid 22261036 May 24 13:30 node lrwxrwxrwx 1 odroid odroid 38 May 24 13:30 npm -> ../lib/node_modules/npm/bin/npm-cli.js $ lessc -v lessc 2.7.1 (Less Compiler) [JavaScript]
As you can see all node.js packages are installed under the node directory. If node-v4.4.5-linux-armv7l/bin was added to $PATH in .bashrc after we install nodejs, we won't need to include all other binary directories (installed via npm) to $PATH individually.
testing under Node, require(), NODE_PATH variable
$ node > var less = require('less'); Error: Cannot find module 'less' at Function.Module._resolveFilename (module.js:325:15) at Function.Module._load (module.js:276:25) at Module.require (module.js:353:17) at require (internal/module.js:12:17) at repl:1:12 at REPLServer.defaultEval (repl.js:262:27) at bound (domain.js:287:14) at REPLServer.runBound [as eval] (domain.js:300:12) at REPLServer.<anonymous> (repl.js:431:12) at emitOne (events.js:82:20) > var less = require('/home/odroid/Downloads/node-v4.4.5-linux-armv7l/lib/node_modules/less'); undefined > less.render('.class { width: (1 + 1) }', function (e, output) { ... console.log(output.css); ... }); .class { width: 2; } undefined >
It is weird that less module was installed globally via npm but node cannot find it. We need to specify the full path.
- https://nodejs.org/api/modules.html
- http://www.bennadel.com/blog/2169-where-does-node-js-and-require-look-for-modules.htm
A solution is to set NODE_PATH environment variable.
$ export NODE_PATH=/home/odroid/Downloads/node-v4.4.5-linux-armv7l/lib/node_modules $ node > var less=require('less') undefined