问将所选内容显示到SVG矩形(JavaScript)

EN

var textBox = svg.append("g")
        .attr("transform", "translate(5,385)");

textBox.append("rect")
        .attr("height", 10)
        .attr("width", 100)
        .style("stroke", "black")
        .style("fill", "none")
        .style("stroke-width", 1);

        var lasso_start = function() {
        lasso.items()
            .attr("r",7) 
            .classed("not_possible",true)
            .classed("selected",false);
};

var lasso_draw = function() {

        lasso.possibleItems()
            .classed("not_possible",false)
            .classed("possible",true);

        lasso.notPossibleItems()
            .classed("not_possible",true)
            .classed("possible",false);
};

var lasso_end = function() {

        lasso.items()
            .classed("not_possible",false)
            .classed("possible",false);

        selected = lasso.selectedItems()
            .classed("selected", true)
            .attr("r", 13);

        var selectedDots = selected.data().map(d=>d[0]);

};

var lasso = d3.lasso()
        .closePathSelect(true)
        .closePathDistance(100)
        .items(circles)
        .targetArea(area)
        .on("start",lasso_start)
        .on("draw",lasso_draw)
        .on("end",function(d) {
            textBox.append("text")
                .attr("x", 10)
                .attr("y", 20)
                .text(lasso_end)
});

svg.call(lasso);