How do I create interactive elements that appear on hover?

I am showing svg elements - let's call them tags - on mouseover events on graph nodes. Show / hide this is pretty nice, although it may have improved. However, I would like the items displayed on the mouse to be clickable.

Currently, mouseover events are not captured on tags. If I disable the mouseout event, which destroys the tags, the events on the tags are captured correctly, but obviously the tags remain forever.

Is there a way for tags to be clickable and destroyed on mouse events on the parent? I was thinking about adding a 1 second delay before removing tags, but not sure how to do it, and if it is correct.

The code below shows an example function - script here: https://jsfiddle.net/pducrot/4eyb81kx/

// graph size
var width = 400;
var height = 400;

var nodes = [{name: 'A'}, {name: 'B'}, {name: 'C'}, {name: 'D'}];
var edges = [{source: 'A', target: 'B'}, {source: 'B', target: 'C'}, {source: 'C', target: 'A'}, {source: 'C', target: 'D'}];
var tags = [10, 35, 56, 9];

var nodeMap = {};
nodes.forEach(function (x) {nodeMap[x.name] = x;});
var links = edges.map(function (x) {
    return {source: nodeMap[x.source], target: nodeMap[x.target], value: 1};
});

var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.attr("pointer-events", "all")
.call(d3.behavior.zoom().on("zoom", redraw))
.append('g');

var force = d3.layout.force()
.gravity(.25)
.distance(140)
.charge(-3500)
.size([width, height]);

var stdDragStart = force.drag().on("dragstart.force");
force.drag()
.on("dragstart", function (d) {
//prevent dragging on the nodes from dragging the canvas
d3.event.sourceEvent.stopPropagation();
stdDragStart.call(this, d);
});

force.nodes(nodes)
.links(links)
.friction(0.8)
.start();

var link = svg.selectAll(".link")
.data(links)
.enter().append("line")
.attr("class", "link");

var node = svg.selectAll(".node")
.data(nodes)
.enter().append("svg:g")
.attr("class", "node")
.attr("id", function (d) {
return d.name
})
.on("dblclick", dblclick)
.on("mouseover", function (d) {
drawTags(tags, d.name);
})
.on("mouseout", function (d) {
d3.select("#" + d.name).selectAll(".tool").remove();
})
.call(force.drag);

node.append("circle")
.attr("class", "circle")
.attr("r", 40);

d3.selectAll(node);

// display name in nodes if node structure
node.append("text")
.attr("text-anchor", "middle")
.attr("dy", ".35em")
.text(function (d) {
return d.name;
});

force.on("tick", function () {
link.attr("x1", function (d) {return d.source.x;})
    .attr("y1", function (d) {return d.source.y;})
    .attr("x2", function (d) {return d.target.x;})
    .attr("y2", function (d) {return d.target.y;});
node.attr("transform", function (d) {
        return "translate(" + d.x + "," + d.y + ")";
    });
});

// redraw after zooming
function redraw() {
    svg.attr("transform", "translate(" + d3.event.translate + ")" + " scale(" + d3.event.scale + ")");
}

function dblclick(d) {
    d3.select(this).classed("fixed", d.fixed = false);
}

function dragstart(d) {
    d3.select(this).classed("fixed", d.fixed = true);
}

function drawTags(tags, onto) {

    var rScale = d3.scale.ordinal()
    .domain(tags)
    .rangeBands([-Math.PI, Math.PI]);

    var local = d3.select("#" + onto).selectAll(".tool")
    .data(tags)
    .enter()
    .append("svg:g")
    .attr("pointer-events", "all")
    .attr("class", "tool")
    .attr("transform", function (d) {
    var x = Math.sin(rScale(d)) * 40;
    var y = Math.cos(rScale(d)) * 40;
    return "translate(" + x + "," + y + ")";
    })
    .on("mouseover", function (d) {
    alert("mouse over tag " + d);
    });
    local.append("circle")
    .attr("class", "circle")
    .attr("r", 15);

    local.append("text")
    .attr("text-anchor", "middle")
    .attr("dy", ".35em")
    .text(function (d) {
    return d
    });
}