smallseo.info

d3

A JavaScript visualization library for HTML and SVG. D3.js - Data-Driven Documents

Is there a way to zoom into a D3 force layout graph?

D3 has a force directed layout here. Is there a way to add zooming to this graph? Currently, I was able to capture the mouse wheel event but am not really sure how to write the redraw function itself. Any suggestions?

    var vis = d3.select("#graph")
        .append("svg:svg")
        .call(d3.behavior.zoom().on("zoom", redraw)) // <-- redraw function
        .attr("width", w)
        .attr("height", h);

Source: (StackOverflow)

A good book for learning D3.js [closed]

I saw d3js via this Skinny!

I was interested and bought this book!, I may be wrong, however found it un-fulfilling.

does anyone have prime material for mastering d3js for data visualisation?

I can see alot of potential for d3js and am very keen and interested.

thanks in advance!

update: I just completed reading Interactive Data Visualization for the Web by Scott Murray, great book! try it, its free.


Source: (StackOverflow)

D3 javascript Difference between foreach and each

What is the difference between forEach and each in D3js?


Source: (StackOverflow)

Invoke a callback at the end of a transition

I need to make a FadeOut method (similar to jQuery) using D3.js. What I need to do is to set the opacity to 0 using transition().

d3.select("#myid").transition().style("opacity", "0");

The problem is that I need a callback to realize when the transition has finished. How can I implement a callback?


Source: (StackOverflow)

Use D3 and Shiny to implement `identify()` in R

I asked a question on how to plot dynamically according to user interactions, whose solution works quite well on my machine.

Now I want to make an on-line version and host it with Shiny.

I have tried to put the code into server.R and invoke the iden() function inside reactivePlot(), but the part of identify() does not take effect.

So, any hints on this task?


Source: (StackOverflow)

d3 axis labeling

How do I add text labels to axes in d3?

For instance, I have a simple line graph with an x and y axis.

On my x-axis, I have ticks from 1 to 10. I want the word "days" to appear underneath it so people know the x axis is counting days.

Similarly, on the y-axis, I have the numbers 1-10 as ticks, and I want the words "sandwiches eaten" to appear sideways.

Is there a simple way to do this?


Source: (StackOverflow)

What is the difference D3 datum vs. data?

Can someone please explain the difference between datum() and data() in D3.js? I see both being used and I am not sure why you should choose one over the other?


Source: (StackOverflow)

How can I remove or replace SVG content?

I have a piece of JavaScript code which creates (using D3.js) an svg element which contains a chart. I want to update the chart based on new data coming from a web service using AJAX, the problem is that each time I click on the update button, it generates a new svg, so I want to remove the old one or update its content.

Here is a snippet from the JavaScript function where I create the svg:

var svg = d3.select("body")
        .append("svg")
        .attr("width", w)
        .attr("height", h);

How can I remove the old svg element or at least replace its content?


Source: (StackOverflow)

Whats the best way to make a d3.js visualisation layout responsive?

Assume I have a histogram script that builds a 960 500 svg graphic. How do I make this responsive so on resize the graphic widths and heights are dynamic?

<script> 

var n = 10000, // number of trials
    m = 10,    // number of random variables
    data = [];

// Generate an Irwin-Hall distribution.
for (var i = 0; i < n; i++) {
  for (var s = 0, j = 0; j < m; j++) {
    s += Math.random();
  }
  data.push(s);
}

var histogram = d3.layout.histogram()
    (data);

var width = 960,
    height = 500;

var x = d3.scale.ordinal()
    .domain(histogram.map(function(d) { return d.x; }))
    .rangeRoundBands([0, width]);

var y = d3.scale.linear()
    .domain([0, d3.max(histogram.map(function(d) { return d.y; }))])
    .range([0, height]);

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

svg.selectAll("rect")
    .data(histogram)
  .enter().append("rect")
    .attr("width", x.rangeBand())
    .attr("x", function(d) { return x(d.x); })
    .attr("y", function(d) { return height - y(d.y); })
    .attr("height", function(d) { return y(d.y); });

svg.append("line")
    .attr("x1", 0)
    .attr("x2", width)
    .attr("y1", height)
    .attr("y2", height);

</script> 

Full example histogram gist is: https://gist.github.com/993912


Source: (StackOverflow)

D3: show data on mouseover of circle

I have a set of data that I am plotting in a scatter. When I mouseover one of the circles I would like it to popup with data (like x, y values, maybe more). Here is what I tried using:

vis.selectAll("circle")
   .data(datafiltered).enter().append("svg:circle")
   .attr("cx", function(d) { return x(d.x);})
   .attr("cy", function(d) {return y(d.y)})
   .attr("fill", "red").attr("r", 15)
   .on("mouseover", function() {
        d3.select(this).enter().append("text")
            .text(function(d) {return d.x;})
            .attr("x", function(d) {return x(d.x);})
            .attr("y", function (d) {return y(d.y);}); });

I suspect I need to be more informative about what data to enter?


Source: (StackOverflow)

Center a map in d3 given a geoJSON object

Currently in d3 if you have a geoJSON object that you are going to draw you have to scale it and translate it in order to get it to the size that one wants and translate it in order to center it. This is a very tedious task of trial and error, and I was wondering if anyone knew a better way to obtain these values?

So for instance if I have this code

var path, vis, xy;
xy = d3.geo.mercator().scale(8500).translate([0, -1200]);

path = d3.geo.path().projection(xy);

vis = d3.select("#vis").append("svg:svg").attr("width", 960).attr("height", 600);

d3.json("../../data/ireland2.geojson", function(json) {
  return vis.append("svg:g")
    .attr("class", "tracts")
    .selectAll("path")
    .data(json.features).enter()
    .append("svg:path")
    .attr("d", path)
    .attr("fill", "#85C3C0")
    .attr("stroke", "#222");
});

How the hell do I obtain .scale(8500) and .translate([0, -1200]) without going little by little?


Source: (StackOverflow)

Protovis vs D3.js

TLDR: Does anyone have experience of both protovis & D3.js to illuminate the differences between the two?

I've been playing with protovis for the last 2 weeks and it's been great so far. Except now I seem to have hit a bit of a brick wall with animation.

protovis: http://vis.stanford.edu/protovis/

I want to do some quite simple animation but with protovis it feels less than intuitive - I'm starting to think that protovis was never really meant for animation. So, I started looking at D3.js:

http://mbostock.github.com/d3/ex/stack.html

It looks very similar, but:

  • Seems more lightweight
  • Seems geared to interacting with other DOM elements as well as SVG
  • Seems geared to adding animations

Can anyone illuminate any other differences?

I'd be very grateful for any and all input


Source: (StackOverflow)

x >= x pattern in JavaScript

When reading source of D3.js I saw x >= x pattern. If it is for detecting NaNs among numbers, why not just isNaN(x) or x == x?

Source, where I encountered it:

d3.min = function(array, f) {
  var i = -1, n = array.length, a, b;
  if (arguments.length === 1) {
    while (++i < n) if ((b = array[i]) != null && b >= b) {
      a = b;
      break;
    }
    while (++i < n) if ((b = array[i]) != null && a > b) a = b;
  } else {
    while (++i < n) if ((b = f.call(array, array[i], i)) != null && b >= b) {
      a = b;
      break;
    }
    while (++i < n) if ((b = f.call(array, array[i], i)) != null && a > b) a = b;
  }
  return a;
};

Source: (StackOverflow)

What is the difference between D3 and jQuery?

Referring to this example:

http://vallandingham.me/stepper_steps.html

it seems that the D3 and jQuery libraries are very similar in the sense that they both do DOM manipulation in an object-chaining way.

I'm curious as to know what functions D3 makes easier than jQuery and vice versa. There are plenty of graphing and visualization libraries that use jQuery as a basis (e.g., , , ).

Please give specific examples of how they are different.


Source: (StackOverflow)

D3.js: "Uncaught SyntaxError: Unexpected token ILLEGAL"?

I've just downloaded D3.js from d3js.org (link to zip file), unzipped it, and referenced it in the following HTML page:

<html>
<head>
<title>D3 Sandbox</title>
<style>
</head>
<body>
<script src="/d3.v3.js"></script>
</body>
</html>

But when I load this page, my console (in Chrome) is giving me this error:

Uncaught SyntaxError: Unexpected token ILLEGAL: line 2

It doesn't like the pi and e symbols at the start of the file. Errrr... what can I do about this? I am serving the file with python's SimpleHTTPServer.

Update: yes I know I can just link to a CDN version, but I would prefer to serve the file locally.


Source: (StackOverflow)