How to highlight the selected node in d3.js?

@tressie.damore 

To highlight the selected node in d3.js, you can use the following steps:

1. Add a class to the selected node: When a node is selected, you can add a specific class to that node using the classed() method in d3.js. This class can be used to apply styling or animations to the selected node.

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d3.select(".selected-node")
   .classed("highlighted", true);

1. Apply styling to the highlighted node: Once you have added the class to the selected node, you can define CSS rules to style the highlighted node. You can change the color, size, or any other property to make the highlighted node stand out.

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.highlighted {
   stroke: red;
   stroke-width: 2px;
}

1. Remove the highlight from other nodes: It is also important to remove the highlight from other nodes when a new node is selected. You can do this by removing the highlighted class from all nodes except the selected node.

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d3.selectAll(".node")
   .classed("highlighted", false);

d3.select(".selected-node")
   .classed("highlighted", true);

By following these steps, you can effectively highlight the selected node in d3.js.