eldh

import * as React from "react";
import { useMousePosition } from "~/hooks/useMousePosition";

/** Component to cover the area between the mouse cursor and the sub-menu, to allow moving cursor to lower parts of sub-menu without the sub-menu disappearing. */
export function MouseSafeArea(props: { parentRef: React.RefObject<HTMLDivElement> }) {
  const { x = 0, y = 0, height: h = 0, width: w = 0 } = props.parentRef.current?.getBoundingClientRect() || {};
  const [mouseX, mouseY] = useMousePosition();
  const positions = { x, y, h, w, mouseX, mouseY };
  return (
    <div

remojansen

function logClass(target: any) {
 
  // save a reference to the original constructor
  var original = target;
 
  // a utility function to generate instances of a class
  function construct(constructor, args) {
    var c : any = function () {
      return constructor.apply(this, args);
    }

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

danielgtaylor

Moving to ES6 from CoffeeScript

I fell in love with CoffeeScript a couple of years ago. Javascript has always seemed something of an interesting curiosity to me and I was happy to see the meteoric rise of Node.js, but coming from a background of Python I really preferred a cleaner syntax.

In any fast moving community it is inevitable that things will change, and so today we see a big shift toward ES6, the new version of Javascript. It incorporates a handful of the nicer features from CoffeeScript and is usable today through tools like Babel. Here are some of my thoughts and issues on moving away from CoffeeScript in favor of ES6.

While reading I suggest keeping open a tab to Babel's learning ES6 page. The examples there are great.

Punctuation

Holy punctuation, Batman! Say goodbye to your whitespace and hello to parenthesis, curly braces, and semicolons again. Even with the advanced ES6 syntax you'll find yourself writing a lot more punctuatio

kolodny

http://kolodny.github.io/bookmarklet.html

document.body.addEventListener('click', go);
alert('click on a form element to get a bookmarklet of the saved form');

function go(event) {
  var form = event.target;
  while (form && form.tagName !== 'FORM') {
    form = form.parentNode;
  }

robertjpayne

#import <Foundation/Foundation.h>
#import "RCTBridgeModule.h"

#define RCT_EXTERN_MODULE(objc_name, objc_supername) \
  RCT_EXTERN_REMAP_MODULE(objc_name, objc_name, objc_supername)

#define RCT_EXTERN_REMAP_MODULE(js_name, objc_name, objc_supername) \
  objc_name : objc_supername \
  @end \
  @interface objc_name (RCTExternModule) <RCTBridgeModule> \

paulirish

/* bling.js */

window.$ = document.querySelectorAll.bind(document);

Node.prototype.on = window.on = function (name, fn) {
  this.addEventListener(name, fn);
}

NodeList.prototype.__proto__ = Array.prototype;

jsdf

// for an updated version see https://github.com/jsdf/react-native-refreshable-listview

var React = require('react-native')
var {
  ListView,
  ActivityIndicatorIOS,
  StyleSheet,
  View,
  Text,
} = React

kejun

var React         = require('react');
var EventListener = require('react/lib/EventListener');
var partition     = require('linear-partitioning');

var TileLayout = React.createClass({
  getDefaultProps: function() {
    return {
      gutter: 0,
      photos: []
    }

wincent

2015-01-29 Unofficial Relay FAQ

Compilation of questions and answers about Relay from React.js Conf.

Disclaimer: I work on Relay at Facebook. Relay is a complex system on which we're iterating aggressively. I'll do my best here to provide accurate, useful answers, but the details are subject to change. I may also be wrong. Feedback and additional questions are welcome.

What is Relay?

Relay is a new framework from Facebook that provides data-fetching functionality for React applications. It was announced at React.js Conf (January 2015).