javascript - Displaying tooltips permanently in d3.js line chart -


i'm making line chart using d3.js. tooltip @ point displayed on mouseover,and disappears on mouseout. want display tooltips permanently when chart created. there way it?

my javascript- 

var x = d3.time.scale().range([0, w]); var y = d3.scale.linear().range([h, 0]);     x.domain(d3.extent(data, function(d) { return d.x; })); y.domain(d3.extent(data, function(d) { return d.y; }));  var line = d3.svg.line()    .x(function(d) {       return x(d.x);    })    .y(function(d) {       return y(d.y);    })  var div = d3.select("body").append("div")           .attr("class", "tooltip")           .style("opacity", 0);  var graph = d3.select("#graph").append("svg:svg")            .attr("width", 900)            .attr("height", 600)            .append("svg:g")            .attr("transform", "translate(" + 80 + "," + 80 + ")");    var xaxis = d3.svg.axis().scale(x).ticks(10).orient("bottom");   var yaxisleft = d3.svg.axis().scale(y).ticks(10).orient("left");   var area = d3.svg.area() .x(function(d) { return x(d.x); }) .y0(h) .y1(function(d) { return y(d.y); });  graph.selectall("circle")      .data(data)      .enter()      .append("circle")      .attr("class", "circle")      .attr("cx", function (d) { return x(d.x); })      .attr("cy", function (d) { return y(d.y); })      .attr("r", 4.5)      .style("fill", "black")      .on("mouseover", function(d) {      div.transition()      .duration(200)      .style("opacity", .9);      div      .html(d.y) + "<br/>" + d.x)      .style("left", (d3.event.pagex) + "px")      .style("top", (d3.event.pagey - 30) + "px");      })      .on("mouseout", function(d) {      div.transition()      .duration(500)      .style("opacity", 0);       });

to label each data point, can add text elements @ appropriate positions. code this.

graph.selectall("text").data(data).enter()      .append("text")      .attr("x", function (d) { return x(d.x); })      .attr("y", function (d) { return y(d.y) - 10; })      .text(function(d) { return d.value; });

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