How to access data of a d3 svg element?

@gilbert 

To access the data of a D3 SVG element, you can use the datum() or data() methods.

1. Using datum(): If you have a reference to the SVG element, you can use the datum() method to access its bound data: var svgElement = d3.select("svg"); // Select the SVG element var data = svgElement.datum(); // Get the bound data of the SVG element
2. Using data(): If you have a selection of multiple SVG elements, you can use the data() method to access the bound data: var svgElements = d3.selectAll("svg"); // Select multiple SVG elements var data = svgElements.data(); // Get the bound data of the SVG elements If you only want to access the bound data of a single specific element in the selection, you can use the datum() method on that element: var firstSvgElement = svgElements.first(); // Get the first SVG element in the selection var data = firstSvgElement.datum(); // Get the bound data of the first SVG element

The datum() and data() methods return the bound data of the selected or specified SVG element(s). Note that these methods will return undefined if no data has been bound to the element(s).