6 - Change Styles Based on Data - Data Visualization with D3 - freeCodeCamp Tutorial

To dynamically changed styles, we can use a function as the value argument in the style method, which can take in an item from the data set and return a value based on that.

Link to challenge : https://www.freecodecamp.org/learn/data-visualization/data-visualization-with-d3/change-styles-based-on-data Concepts: selection.style(name[, value[, priority]]) If a value is specified, sets the style property with the specified name to the specified value on the selected elements and returns this selection. If the value is a constant, then all elements are given the same style property value; otherwise, if the value is a function, it is evaluated for each selected element, in order, being passed the current datum (d), the current index (i), and the current group (nodes), with this as the current DOM element (nodes[i]). The function’s return value is then used to set each element’s style property. A null value will remove the style property. An optional priority may also be specified, either as null or the string important (without the exclamation point). If a value is not specified, returns the current value of the specified style property for the first (non-null) element in the selection. The current value is defined as the element’s inline value, if present, and otherwise its computed value. Accessing the current style value is generally useful only if you know the selection contains exactly one element. https://github.com/d3/d3-selection/blob/v1.4.1/README.md#selection_style -————————————————————————————————————-

D3.js (also known as D3, short for Data-Driven Documents) is a JavaScript library for producing dynamic, interactive data visualizations in web browsers. It makes use of Scalable Vector Graphics (SVG), HTML5, and Cascading Style Sheets (CSS) standards.

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