By Scott Murray

Create and put up your individual interactive facts visualization initiatives on the net, no matter if you don't have any event with both internet improvement or info visualization. it is simple with this hands-on advisor. you will begin with an outline of knowledge visualization strategies and straightforward net applied sciences, after which the right way to use D3, a JavaScript library that allows you to convey info as visible parts in an online web page.

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Additional resources for Interactive Data Visualization for the Web: An Introduction to Designing With D3

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3467; var active = true; var text = "Crystal clear"; How boring — var, var, var, var! — yet handy, as we can declare and name variables before we even know what type of data will go into them. You can even change a variable’s type on the fly without JavaScript freaking out on you. "; value = "Argh, it does work! info Other Variable Types A variable is a datum, the smallest building block of data. The variable is the foundation of all other data structures, which are simply different configurations of variables.

We’ll learn how to apply inline styles programmatically with D3 (which is much easier than typing them in by hand, one at a time). Inheritance, Cascading, and Specificity Many style properties are inherited by an element’s descendants unless otherwise speci‐ fied.

Yet when this page renders, the styles intended for the div (red background, bold text, and so on) are inherited by the second paragraph, since that p is a descendant of the styled div. Figure 3-7. Inherited style Inheritance is a great feature of CSS, as child adopt the styles of their parents.

Then, instead of assigning a simple number or string, we store an entire function in the variable! In the parentheses, we name bill, another variable to be used only by the function itself. bill is the expected input. 2, and return the result as its output. 68. Not bad — a 20% tip! 68 to the console There are also anonymous functions which, unlike calculateGratuity, don’t have names. Anonymous functions are used all the time with D3, but I’ll introduce them later. Comments /* JavaScript supports CSS-style comments like this.

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