I am trying to add a tooltip to the multiline chart but I'm unable to format it like the way I wanted. Currently I'm getting tooltip text at the connecting points but I want to get all the point data inside a rect
at the top like in the sample image I'm using d3 for the chart. Here's the piece of code on mousemove.
.on('mousemove', function (e) { // mouse moving over canvas
const mouse = e.clientX;
d3.select(".mouse-line-" + chart_sel)
.attr("d", function () {
var d = "M" + mouse + "," + height;
d += " " + mouse + "," + 0;
return d;
});
d3.selectAll(".mouse-per-line-" + chart_sel)
.attr("transform", function (d, i) {
var xDate = x.invert(mouse),
bisect = d3.bisector(function (d) { return d.date; }).right;
idx = bisect(d.values, xDate);
d3.select(".mouse-line-" + chart_sel)
.attr("d", function () {
var data = "M " + x(d.values[idx].date) + "," + (height);
data += "L " + x(d.values[idx].date) + "," + 0;
return data;
});
var beginning = 0,
end = lines[i].getTotalLength(),
target = null;
while (true) {
target = Math.floor((beginning + end) / 2);
pos = lines[i].getPointAtLength(target);
if ((target === end || target === beginning) && pos.x !== mouse[0]) {
break;
}
if (pos.x > mouse[0]) end = target;
else if (pos.x < mouse[0]) beginning = target;
else break; //position found
}
d3.select(this).select('text')
.text(Math.round(y.invert(pos.y)))
.style("text-anchor", "start")
return "translate(" + x(d.values[idx].date) + "," + y(d.values[idx].value) + ")";
});
})
Here's the link to the code in codepen .
Here's the sample for the tooltip
Thanks in advance!
I found some errors in your pen:
You cannot use d3.pointer(this)
in D3.V6. Instead, get the pointer position from the mousemove callback argument:
.on('mousemove', e => {
const x = e.clientX; // instead of mouse[0]
...
}
The path string you format has 'M' (move to) but doen not have 'L' (line to) directive, should be 'M x,y L x,y' :
var data = "M " + x(d.values[idx].date) + "," + (height);
data += "L " + x(d.values[idx].date) + "," + 0;
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