Book Image

Highcharts Cookbook

By : Nicholas Terwoord
Book Image

Highcharts Cookbook

By: Nicholas Terwoord

Overview of this book

<p>Highcharts is a JavaScript library that enables web developers to create a wide range of different, highly customized charts. Highcharts easily integrates with existing JavaScript frameworks and is simple enough to make a column chart in a few lines of code, but flexible enough to handle more complex charting scenarios such as viewing multiple chart types with different data sources on a multitude of devices and form-factors.</p> <p>"Highcharts Cookbook" is a practical guide that provides you with clear, step-by-step recipes to create dynamic, functional charts in your web applications using Highcharts. With "Highcharts Cookbook", you will create and design dynamic and versatile charts in different scenarios.</p> <p>"Highcharts Cookbook" through its wide array of recipes will walk you through everything you need to know about Highcharts and will enable you to unleash its full potential in your web applications quickly and easily.</p> <p>You will learn how to integrate Highcharts with different frontend and backend libraries such as ExtJS, jQuery, and the Yii framework with some examples in Python, PHP, and NodeJS. You will also cover how to handle user interactions like form input and mouse events, how to fetch remote data in CSV, XML, and JSON format, and how to render charts for offline usage. If you want to learn the different ways you can leverage the power of Highcharts to create, integrate and extend its features in your application, then this book is for you.</p>
Table of Contents (19 chapters)
Highcharts Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Annotating a chart


It can be useful to include information about a chart on a chart. While tooltips is one option, there are times when we may want to leave a note to ourselves. Due to the various events that Highcharts is able to capture, it is possible for us to annotate charts.

Getting ready

For setting up a basic page and installing jQuery and Highcharts, refer to the Getting ready section of the Creating your first chart recipe in Chapter 1, Getting Started with Highcharts.

How to do it...

To get started, perform the following steps:

  1. In addition to the regular chart container, create a text area to enter your annotations, as shown in the following code:

    <div id='container'></div>
    <textarea id='annotation'></textarea>
  2. Create a click handler for your chart, as shown in the following code:

    var annotateChart = function (event) {
        var x, y, text, box, content;
        x = event.chartX;
        y = event.chartY;
    
        // get content from the textarea
        content = $('#annotation...