javascript - D3イベントリスナーを適切に作成するには?

Question

一連の六角形を描画するコードがありますが、それらを白く表示し、それらの上にマウスを置いたときに他の処理を実行する必要があります。イベント リスナが機能しないのはなぜですか?どうすればよいですか? http://jsfiddle.net/rewBr/

var elementTags = ["Google", 4, "Wikipedia", "Yahoo!", "Cindy"];
var _s32 = (Math.sqrt(3)/2);
var A = 75;

var svgContainer = d3.select("body") //create container
    .append("svg")
    .attr("width", 1000)
    .attr("height", 1000);
var xDiff = [0, 200, 400, 600, 800, 1000, 1200, 1400];
var yDiff = [200, 200, 200, 200, 200, 200, 200];

for (index = 0; index < elementTags.length; index++) { var pointData = [ [A+xDiff[index], 0+yDiff[index]], [A/2+xDiff[index], (A*_s32)+yDiff[index]], [-A/2+xDiff[index], (A*_s32)+yDiff[index]], [-A+xDiff[index], 0+yDiff[index]], [-A/2+xDiff[index], -(A*_s32)+yDiff[index]], [A/2+xDiff[index], -(A*_s32)+yDiff[index]], [A+xDiff[index], 0+yDiff[index]]];

    var hexMouseOver = function(){
        console.log(this);
        this.style("fill", "white");
    }

var enterElements = svgContainer.selectAll("path.area") //draw element
    .data([pointData]).enter().append("path")
    .style("fill", "#1D85E0")
    .style("stroke", "black")
    .attr("d", d3.svg.line())
    .style("shape-rendering", "auto")
    .on("mouseover", hexMouseOver);

} var addText = svgContainer.selectAll("text").data(elementTags).enter().append("text");

var textElements = addText
            .attr("x", function(d, i){
                return xDiff[i];})
            .attr("y", function(d, i){
                return yDiff[i];})
            .attr("font-family", "Arial Black")
            .attr("font-size", "20px")
            .attr("fill", "1A2E40")
            //.attr("font-variant", "small-caps")
            .style("text-anchor", "middle")
            .text(function(d, i){return d;});