How to update elements of D3 force layout when the underlying data changes

Question

I\'m using one of the force layout examples (http://bl.ocks.org/1153292) to show a network on my web site.

I allow the user to choose which type of links to see at a

Answer 1

I've found the answer in this post

var circle = svg.selectAll("circle")
    .data(data);

circle.enter().append("circle")
    .attr("r", 2.5);

circle
    .attr("cx", function(d) { return d.x; })
    .attr("cy", function(d) { return d.y; });

circle.exit().remove();

The answer is that I need to call attr operator on the result of selectAll.data and not on the result of the append operator.