How to get the parent selection in d3.js?

@arnoldo.moen 

In D3.js, you can get the parent selection using the selection.parent() method. This method returns the parent selection of the current selection in the DOM hierarchy. Here's an example of how you can use it:

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// Select an element with the class name 'child'
var child = d3.select('.child');

// Get the parent selection of the child element
var parent = child.parent();

// Do something with the parent selection
parent.style('background-color', 'lightblue');

In this example, we first select an element with the class name 'child', then we use the parent() method to get the parent selection of this element. Finally, we change the background color of the parent element to 'lightblue'.

It's important to note that the parent() method will return an empty selection if the current selection does not have a parent element.