d3scription

D3 tooltip description following mouse cursor. With window edge collision solved.

This plugin tries to be as universal and simple as possible. You can install it using your favorite dependency manager - doesn't matter if it is NPM or bower. You can also directly download distribution if you do not use any of these. It supports many module systems (commonjs, AMD, TypeScript). You can easily customize look in your css and overwrite all default values by providing your own.

Instalation

NPM

This will install npm package with commonjs module system:

npm install d3scription --save

Bower

This will install bower package with AMD module and global d3scription variable:

bower install d3scription --save

Direct download

If you do not want to use any dependency manager in your project you can simply download distribution and place it in your project. This is exactly the same file as installed using bower. It supports AMD modules or global d3scription function.

curl https://raw.githubusercontent.com/GlobalWebIndex/d3scription/master/dist/d3scription.js > d3scription.js

Usage

You can use this plugin with both JavaScript and TypeScript. Please see demos for some example usage.

JavaScript

Assume you have d3scription.js file already loaded in browser together with d3.js or AMD manager is used you're able to use this plugin in similar fashion. Don't forget, that this plugin itself is dependent on D3 so you need to include d3 before you load d3scription!

// define some example data
var data = [
    {
        x: 50,
        y: 100,
        desc: 'We are your friends...'
    },
    {
        x: 200,
        y: 50,
        desc: 'I love it!'
    }
]

// select SVG element and create main group
var el = d3.select('svg')
    .append('g');

// setup plugin with description getter function and default options.
// if you want to overwrite default z-index, offset or class name please see `api:setup:options section`
var tipFactory = d3scription(function(d) { return d.desc; });

// create tip for our main group element
var tip = tipFactory()
    .element(el);

// set data to circles
var circles = el.selectAll('.circle')
    .data(data);

// draw circles
var cEnter = circles.enter()
    .append('circle')
    .attr('class', 'circle')
    .attr('r', 30)
    .attr('cx', function(d) { return d.x; })
    .attr('cy', function(d) { return d.y; })
    // setup show and hide action on mouse events
    .on('mouseover', tip.show)
    .on('mouseout', tip.hide);

Typescript

Usage with typescript is quite simmilar as usage with any other module system.

import d3scription from 'd3scription';

interface Data {
    x : number;
    y : number;
    desc : string;
}

// define some example data
const data : Data[] = [
    {
        x: 50,
        y: 100,
        desc: 'We are your friends...'
    },
    {
        x: 200,
        y: 50,
        desc: 'I love it!'
    }
]

// select SVG element and create main group
const el = d3.select('#first-example')
    .append('g');

// setup plugin with description getter function and default options.
// if you want to overwrite default z-index, offset or class name please see `api:setup:options section`
const tipFactory = d3scription((d : Data) => d.desc);

// create tip for our main group element
const tip = tipFactory()
    .element(el);

// set data to circles
const circles = el.selectAll('.circle')
    .data(data);

// draw circles
const cEnter = circles.enter()
    .append('circle')
    .attr('class', 'circle')
    .attr('r', 30)
    .attr('cx', d => d.x)
    .attr('cy', d => d.y)
    // setup show and hide action on mouse events
    .on('mouseover', tip.show)
    .on('mouseout', tip.hide);

Styles

You can import or copy default styles to your project if you want. Anyway as you can see writing your own styles for tooltip is really simple.

API

Api is design as three steps process to make reuse and flow as clean as possible. These steps are setup > initialize > use. Folloving paragraphs describes each step individually.

Setup

First you need to setup new Tip factory (you can think about it as alternative to subclassing base class with necessary options even it's not really uses classes at all). This is done using the only public function provided by d3scription out of the box - de3scription([contentGetter], [optionalOptions]).

This function accept two parameters - contentGetter and options.

Content getter is just regular function which takes data and returns string content of tip. This works the same way as many d3 methods like .attr('x', [getter]) or .style('fill', [getter]).

Options

Are used for overwriting default settings of plugin. It's a hash where every key is optional. For typescript plugin exports this interface under name Options. There are all possible values:

• zIndex sets css z-index of tip element (default is 100).
• class set custom class name for element (default is d3scription-tip).
• offset["top"] top offset of tip (default is -10).
• offset["left"] left offset of tip (default is 10).

You can create one settuped tipFactory and reuse it on multiple places or create as many of these factories as you wish.

Example

function getDescription(data) {
  return data.toolTipText;
}
var options = {
  zIndex: 1000,
  class: 'my-tooltip',
  offset: {
    top: 20,
    left: 20
  }
}
var myD3scription = d3Scription(getDescription, options);
var defaultD3scription = d3scription(getDescription);

Factory

Settup function return another function which takes element in which tip should be active. This is element in which tip will follow mouse. This function also creates final tip. You can create many tips from one factory using this function.

Example

var element = d3.select('svg').append('g');
var tip = myD3scription().element(element); // this function was returned by setup

Tip

Finally you'll have a tip instance returned by from factory (after passing element). Now you can call methods on this tip as you wish. Most common case is to show(data) and hide() on mouse events. you can also take advantage of element(element) for changing orginal element of tip or using destroy().

Tip API

• show(data) sets content of tip and displays it.
• hide() hides tip
• element(element) sets new element for tip
• destroy() removes tip from dom

Basic Example of usage

// define circle elements and bind data for them
var circles = el.selectAll('.circle')
    .data(data);

// create circles and add tips actions to them
var cEnter = circles.enter()
    .append('circle')
    .attr('class', 'circle')
    .attr('r', 30)
    .attr('cx', function(d) { return d.x; })
    .attr('cy', function(d) { return d.y; })
    // show tip on mouseover
    // NOTE: will use binded data for setting content of tip
    .on('mouseover', tip.show)
    // hide tip on mouseout event
    .on('mouseout', tip.hide);

Changelog

• v1.0.1 - update position on show (fixes situations where show is called but mouseMove event doesn't happen)
• v1.0.0 - improve API
• v0.0.2 - window edge collision detections
• v0.0.1 - initial release

Building localy

All PRs are welcome! This is why we tried to made whole development setup as simple as possible.

Clone repository:

git clone git@github.com:GlobalWebIndex/d3scription.git

Install all dependecies via NPM and Bower:

npm install && bower install

The main file you want to work with is index.ts. There are also demo examples where you can play with plugin.

Building project

There are few handy npm scripts already settuped up.

If you want to run project as watch run:

npm run watch

you can then open demo/index.html in browser. Project will be compiled in background if you made any change to source.

For building distribution please run following.

npm run compile

This will compile all versions of plugin (including commonjs for usage with NPM).

License

MIT

About GlobalWebIndex

d3scription is maintained by GlobalWebIndex Ltd.

See more about us at www.globalwebindex.net.