I\'m using the force layout to represent a directed unweighted network. My inspiration comes from the following example: http://bl.ocks.org/mbostock/1153292
At the end I found this related question which implements a solution which I'll adopt.
D3 force directed graph with drag and drop support to make selected node position fixed when dropped
http://bl.ocks.org/norrs/2883411
function nameOfFunction () {
d3.selectAll(".classOfYourNodes").each(
function(d) {
d.fixed = true;
}
)
}
The method .each calls the anonymous function, which in this case sets the "fixed" attribute to true for every node within the selection.
Edit: The above is in regards to your comment about wanting to stop all of the nodes and not have the force simulation continue when you drag a node, as calling force.stop() does.