nowfound

Life & fun · June 25, 2012

HH

How HN's upvote link works

Each link has an anchor tag like this: <a href="vote?for=4156127&dir=up&by=asto&auth=12345&whence=%6e%65%77%73" onclick="return vote(this)" id="up_4156127"> <img vspace="3" hspace="2" border="0" src="http://ycombinator.com/images/grayarrow.gif"> </a> The vote function looks like this: function vote(node) { var v = node.id.split(/_/); // {'up', '123'} var item = v[1]; // hide arrows byId('up_' + item).style.visibility = 'hidden'; byId('down_' + item).style.visibility = 'hidden'; // ping server var ping = new Image(); ping.src =…

Alternatives

What it does

In the maker’s words, at launch

Each link has an anchor tag like this: <a href="vote?for=4156127&dir=up&by=asto&auth=12345&whence=%6e%65%77%73" onclick="return vote(this)" id="up_4156127"> <img vspace="3" hspace="2" border="0" src="http://ycombinator.com/images/grayarrow.gif"> </a> The vote function looks like this: function vote(node) { var v = node.id.split(/_/); // {'up', '123'} var item = v[1]; // hide arrows byId('up_' + item).style.visibility = 'hidden'; byId('down_' + item).style.visibility = 'hidden'; // ping server var ping = new Image(); ping.src = node.href; return false; // cancel browser nav byId is getElementById. I don't know about you guys but I thought this was pretty neat!

Does the same job

all alternatives →

More life & fun this month

the category →
  • TL
    The load-bearing vocabulary of Claude▲703

    Life & fun · 10d ago · louisabraham.github.io

  • iPhone app takes simultaneous images from 2 lenses, fuses into 1 photo▲329

    Photosynthesis fires two of your iPhone

    Life & fun · 28d ago · photosynthesis.camera

  • SoloUno▲310

    Take control of hair pulling, nail biting & skin picking

    Life & fun · 28d ago · solouno.io

  • Scroll through all 43252003274489856000 Rubik's Cube states▲295

    Scroll through all 43,252,003,274,489,856,000 reachable Rubik's Cube permutations.

    Life & fun · 26d ago · everycube.alen.is

  • Expeditione▲265

    The Interactive 3D Encyclopedia

    Life & fun · 21d ago · expeditione.fun

  • Eigendrum - Draw any shape and hear what it sounds like as a drum▲243

    Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…

    Life & fun · 26d ago · baselashraf81.github.io

Launched alongside, June 2012

the whole month →