Update Pattern

_.md

[ Launch Inlet ]
Gist #2958196 No Previous Gist

config.json

{"description":"Update Pattern","endpoint":"","display":"svg","public":true,"require":[],"tab":"edit","display_percent":0.5502362112855866,"play":false,"loop":false,"restart":false,"autoinit":true,"pause":true,"loop_type":"period","bv":false,"nclones":15,"clone_opacity":0.4,"duration":3000,"ease":"linear","dt":0.01,"editor_editor":{"coffee":false,"vim":false,"emacs":false,"width":600,"height":300,"hide":false}}

inlet.js

var alphabet = "abcdefghijklmnopqrstuvwxyz".split("");

var width = 960,
    height = 500;
var svg = d3.select('svg');

svg.append("g")
    .attr("transform", "translate(32," + 50 + ")");

function update(data) {

  // DATA JOIN
  // Join new data with old elements, if any.
  var text = svg.selectAll("text")
      .data(data);

  // UPDATE
  // Update old elements as needed.
  text.attr("class", "update");

  // ENTER
  // Create new elements as needed.
  text.enter().append("text")
      .attr("class", "enter")
      .attr("x", function(d, i) { return i * 32; })
      .attr("dy", ".35em");

  // ENTER + UPDATE
  // Appending to the enter selection expands the update selection to include
  // entering elements; so, operations on the update selection after appending to
  // the enter selection will apply to both entering and updating nodes.
  text.text(function(d) { return d; });

  // EXIT
  // Remove old elements as needed.
  text.exit().remove();
}

// The initial display.
update(alphabet);

// Grab a random sample of letters from the alphabet, in alphabetical order.
//setInterval(function() {
//  update(shuffle(alphabet)
//      .slice(0, Math.floor(Math.random() * 26))
//      .sort());
//}, 1500);

// Shuffles the input array.
function shuffle(array) {
  var m = array.length, t, i;
  while (m) {
    i = Math.floor(Math.random() * m--);
    t = array[m], array[m] = array[i], array[i] = t;
  }
  return array;
}

style.css

text {
  font: bold 48px monospace;
}

.enter {
  fill: green;
}

.update {
  fill: #333;
}