Develop Reference

How to show values in a tooltip

I've built a network graph and I want to show the information from the data source in my tooltip based on the circle you hover over. Currently, my hover action to turn the circle red works, but my tooltip just shows the same value regardless of where you hover. I'm confused as to where I'm going wrong and how to rectify this. Any help would be appreciated. Here's my code below:
const node = svg.append("g")
.selectAll("circle")
.data(nodes)
.join("circle")
.attr("r", 0.4)
.attr("fill", "#f2d974")
.attr("fill-opacity", 0.4);
simulation.on("tick", () => {
link
.attr("x1", d => d.source.x)
.attr("y1", d => d.source.y)
.attr("x2", d => d.target.x)
.attr("y2", d => d.target.y);
node
.attr("cx", d => d.x)
.attr("cy", d => d.y);
});
var tooltip = d3.select("#france")
.append("div")
.data(nodes)
.style("position", "absolute")
.style("visibility", "visible")
.style("background", "white")
.style("border", "solid")
.style("border-width", "0.5px")
.style("border-radius", "5px")
.style("padding", "5px")
.style("width", "100px")
.style("height", "100px")
.text(d=>d.id)
console.log(d=>d.id)
node
.on("mousemove", function(d){
console.log(d)
d3.select(this).style("fill", "red")
tooltip.style("visibility", "visible")
.style("top", (event.pageY))
.style("left", (event.pageX))
.text(d=>d.id)
})
.on("mouseout", function(){
tooltip.style("visibility", "hidden")
})

You are always seeing the same value because you are using the data element from the tooltip:
tooltip.style("visibility", "visible")
.style("top", (event.pageY))
.style("left", (event.pageX))
.text(d=>d.id) // -> this is the d.id binded to the tooltip
Your issue is a shaded variable
Can you try this code and let me know if it works:
tooltip.style("visibility", "visible")
.style("top", (event.pageY))
.style("left", (event.pageX))
.text(d.id)

Fancy Bubble chart D3 Javascript

I would like to ask if anyone know how to get the code to do similar chart like this https://www.theguardian.com/world/interactive/2013/feb/12/state-of-the-union-reading-level
It is written in D3 but I couldn't find similar codes online.
Thanks

I think this is just a fairly involved tooltip on a scatter plot. Here's a simpler example:
// Define the div for the tooltip
var div = d3.select("body").append("div")
.attr("class", "tooltip")
.style("opacity", 0);
// Add the scatterplot
svg.selectAll("dot")
.data(data)
.enter().append("circle")
.attr("r", 5)
.attr("cx", function(d) { return x(d.date); })
.attr("cy", function(d) { return y(d.close); })
.on("mouseover", function(d) {
div.transition()
.duration(200)
.style("opacity", .9);
div .html(formatTime(d.date) + "<br/>" + d.close)
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY - 28) + "px");
})
.on("mouseout", function(d) {
div.transition()
.duration(500)
.style("opacity", 0);
});
You might also find this other example useful.

D3.js How to add tooltip in my legend using line graph

I draw a line graph using D3.js and i am using tooltip in line graph,but i am also using tooltip in legends but enable to show the tooltip in legends,i wrote given code,it is possible to show the tooltip in legends.
var dates=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31];
var legend = canvas.append("g")
.attr("class", "legend")
// .attr("transform", "translate(70,10)");
var legendRect = legend.selectAll('rect').data(dates);
legendRect.enter()
.append("rect")
.attr("x", function (d,i){return i*14;})
.attr("width", 12)
.attr("height", 20)
.attr("y", 10)
.style("fill","steelblue")
legend.selectAll("text")
.data(dates)
.enter()
.append("text")
.attr("x", function (d,i){return i*14;})
.attr("y", 25)
.attr("font-family", "sans-serif")
.attr("font-size", "11px")
.attr("fill", "white")
.text(function(d) {
return d;
})
.on("mouseover", function(d) {
div.transition()
.duration(200)
.style("opacity", .9);
div .html(formatTime(d.key) + "<br/>" + d.value)
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY-28) + "px");
})
.on("mouseout", function(d) {
div.transition()
.duration(500)
.style("opacity", 0);
});
Iam adding tooltip in text but enable to show the tooltip in my values(I have only problem in legend tooltip)

Check out this code. It does exactly what you want.
This is also a great example.

tooltip to show single element of group

I have a bar chart and I have text values at the end of each bar. What I would like to do is set text to invisible, and on mouseover I'd like it to show the number associated with the bar, at the magnitude of that bar. I'm having trouble figuring out how to do this in an efficient manner.
var tooltip = d3.select("body").append("div")
.style("position", "absolute")
.attr("class", "tooltip")
.style("opacity", 0);
var rect = svg.selectAll("rect")
.attr("class", "rect")
.data(dataset)
.enter()
.append("rect")
.attr("y", function(d,i){
return yScale(i);
})
.attr("x", 0)
.attr("width", function(d,i){
return xScale(d);
})
.attr("height", h/dataset.length)
.style("fill", function(d,i){
return colors(d);
})
.on("mouseover", function(d){
d3.select(this).style("opacity", 0.5)
tooltip.transition()
.duration(200)
.style("opacity", 1);
tooltip.html(d)
.style("left", d3.event.pageX + "px")
.style("top", d3.event.pageY + "px")
})
.on("mouseout", function(d){
d3.select(this).style("opacity", 1)
tooltip.transition()
.duration(500)
.style("opacity", 0)
});

Instead of mouseover and mouseout, I recommend doing it with $(this).hover and $(this).mousemove. Try something like this:
$(this).hover(
function() {
tooltip.transition()
.duration(200)
.style("opacity", 1)
// In order to trigger the magnitude or 'width' of the rect:
var rectWidth = $(this).attr("width");
}, function () {
tooltip.transition()
.duration(500)
.style("opacity", 1e-6)
}
);
/*$(this).mousemove(function(event) {
tooltip
.style("left", event.clientX + "px")
.style("top", event.clientY + "px")
});*/

d3.js change color and size on line graph dot on mouseover

I made a line graph with d3.js (see the attached image1).
I managed to insert tooltips on graph dots when mouseover.
I'd like to change color and size of dots too. I tried in many ways but it seems really difficult. Any help?
Here is the piece of code:
svg.selectAll("dot")
.data(data)
.enter().append("circle")
.attr("r", 5.5)
.style("fill", "#fff8ee")
.style("opacity", .8) // set the element opacity
.style("stroke", "#f93") // set the line colour
.style("stroke-width", 3.5)
.attr("cx", function(d) { return x(d.date); })
.attr("cy", function(d) { return y(d.close); })
.on("mouseover", function(d) {
div.transition()
.duration(70)
.style("opacity", .7)
;
div .html(formatTime(d.date) + "<br/>" + d.close)
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY - 28) + "px");
})
.on("mouseout", function(d) {
div.transition()
.duration(200)
.style("opacity", 0);
});

Just set color and size in the handlers:
.on("mouseover", function(d) {
d3.select(this).attr("r", 10).style("fill", "red");
})
.on("mouseout", function(d) {
d3.select(this).attr("r", 5.5).style("fill", "#fff8ee");
});

I don't know why, but while d3.select(this) used to work, it doesn't anymore. I now use d3.select(event.currentTarget).
So, if we consider svg as the graph and all its circles being red by default, we can change the color of the circles to green on mouseover and return the color to red on mouseout like this:
svg.on("mouseover", function(d){
d3.select(event.currentTarget)
.style("fill", "green");
})
.on("mouseout", function(d){
d3.select(event.currentTarget)
.style("fill", "red");
});