Reputation: 12394
I implement a tooltip over circles placed through d3 on a leafletmap like this:
var tooltip = d3.select("body")
.append("div")
.attr("id", "mytooltip")
.style("position", "absolute")
.style("z-index", "10")
.style("visibility", "hidden")
.text("a simple tooltip");
feature.on("mouseover",function(d) {
d3.select(this)
.transition()
.ease("elastic")
.duration(500)
.attr('r', function (d){
return (d.properties.xy * 5)
.style("stroke", "black")
d3.select("#mytooltip")
.style("visibility", "visible")
.text(d.properties.xy1 + " " + d.properties.xy2)
});
feature.on("mousemove", function() {
return tooltip.style("top", (d3.event.pageY-10)+"px")
.style("left",(d3.event.pageX+10)+"px");
});
feature.on("mouseout",function(d) {
d3.select(this)
.transition()
.ease("elastic")
.duration(500)
.attr('r', function (d){
return (d.properties.xy);
})
.style("stroke", "none")
d3.select("#mytooltip")
.style("visibility", "hidden")
});
Where my feature is this:
var feature = g.selectAll("circle")
.data(myData.features)
.enter()
//...
I wonder how I can style the tooltip that shows up? Is there a way to give it a background, write something in bold, italic, different colors etc?
Upvotes: 4
Views: 4693
Reputation: 102194
This is what I like to do. First, I set the CSS style for the tooltip, using a div with a class named "tooltip":
div.tooltip {
position: absolute;
etc...
}
Then I set a tooltip var (here, svgId
is the ID of the element where you append your SVG, not much different of selecting "body" as you did):
var tooltip = d3.select("#svgId").append("div")
.attr("class", "tooltip")
.style("opacity", 0);
The div has 0
opacity. Then it's just a matter of showing the tooltip on mouseover
or mousemove
:
selection.on("mousemove", function(d) {
tooltip.html("<strong> Look, I'm bold !</strong> and now I'm not bold<br>
and this is another line!and this is my data: " + d.whatever)
.style('top', d3.event.pageY - 12 + 'px')
.style('left', d3.event.pageX + 25 + 'px')
.style("opacity", 1);
});
You can use HTML tags to style your text inside the tooltip, making it bold, italic etc. And, finally, we make the tooltip disappear on mouseout (as you did):
selection.on("mouseout", function(d) {
tooltip.style("opacity", 0);
});
Since the div with 0
opacity still takes space in the page, a better approach is changing its display
property from none
to block
during the mouseover
, and back to none
in the mouse out
.
Upvotes: 6
Reputation: 99
You can style the tooltip with CSS. You could do that in a separate .css
file, in a <style>
tag, or with d3 the same way you give the tooltip visibility. Something like .style("background", "rgba(179, 107, 0, 0.5)")
Upvotes: 0