How to add Tooltips to d3 Bar Graph?
Question
I am currently trying to create a bar graph which represents data and is able to change based on a selection, but the bars are hard to read and make understanding the data difficult. I am trying to make a tooltip which shows the number of resources being used per project. Here is my code so far:
<!DOCTYPE html> <html> <head> <meta> <meta http-equiv="refresh" content="90"> <meta name="description" content="Drawing Shapes w/ D3 - BarChart" /> <meta charset="utf-8"> <title>Resources per Project</title> <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> <style type="text/css"> h1 { font-size: 35px; color: darkgrey; font-family: Helvetica; border-bottom-width: 3px; border-bottom-style: dashed; border-bottom-color: black; } h2 { font-size: 20px; color: black; font-family: Helvetica; text-decoration: underline; margin-left: 350px; margin-top: 2px; } </style> </head> <body> <h1>Resources used per Project</h1> <p>Choose Month: <select id="label-option"> <option value="April">April</option> <option value="May">May</option> <option value="June">June</option> <option value="July">July</option> <option value="August">August</option> <option value="September">September</option> </select> <script type="text/javascript"> var width = 800 var height = 500 var emptyVar = 0 var dataArrayProjects = ['2G', 'An', 'At', 'Au', 'AW', 'Ch', 'CI', 'CN'] var April = [0.35, 1.66, 3.04, 1.54, 3.45, 2.56, 2.29, 1.37] var May = [0.36, 1.69, 3.08, 1.54, 3.62, 2.61, 2.22, 1.44] var June = [0.34, 1.7, 3.08, 1.63, 3.66, 2.68, 2.24, 1.51] var July = [0.3, 1.72, 3.17, 1.67, 3.56, 2.56, 2.17, 1.44] var August = [0.28, 1.79, 3.18, 1.71, 3.62, 2.73, 2.26, 1.54] var September = [1.23, 1.74, 3.12, 1.61, 3.66, 2.71, 2.2, 1.48] var widthScale = d3.scale.linear() .domain([0, 4]) .range([0, width - 60]); d3.select("#label-option").on("change", change) function change() { var data = April; if (this.selectedIndex == 1){ data = May; } else if (this.selectedIndex == 2){ data = June; } else if (this.selectedIndex == 3){ data = July; } else if (this.selectedIndex == 4){ data = August; } else if (this.selectedIndex == 5){ data = September; } canvas.selectAll("rect") .data(data) .attr("width", emptyVar) .attr("height", 50) .attr("fill", function(d) { return color(d) }) .attr("y", function(d, i) { return i * 55 }) bars.transition() .duration(1500) .delay(200) .attr("width", function(d) { return widthScale(d); }) } var heightScale = d3.scale.ordinal() .domain(dataArrayProjects) .rangePoints([10, height - 85]); var color = d3.scale.linear() .domain([0, 4]) .range(["#000066", "#22abff"]) var axis = d3.svg.axis() .ticks("10") .scale(widthScale); var yAxis = d3.svg.axis() .scale(heightScale) .orient("left"); var canvas = d3.select("body") .append("svg") .attr("width", width) .attr("height", height) .append("g") .attr("transform", "translate(40, 0)"); var bars = canvas.selectAll("rect") .data(April) .enter() .append("rect") .attr("width", emptyVar) .attr("height", 50) .attr("fill", function(d) { return color(d) }) .attr("y", function(d, i) { return i * 55 }) canvas.append("g") .attr("transform", "translate(0, 430)") .attr("font-family", "Helvetica") .attr("font-size", "15px") .call(axis); canvas.append("g") .attr("font-family", "Helvetica") .attr("font-size", "15px") .style("fill", "black") .attr("class", "y axis") .call(yAxis); bars.transition() .duration(1500) .delay(200) .attr("width", function(d) { return widthScale(d); }) var yAxisLine = canvas.append("line") .attr("x1", -3) .attr("y1", 0) .attr("x2", -3) .attr("y2", 436) .attr("stroke-width", 6) .attr("stroke", "black"); </script> <h2>Resources</h2> </body> </html>
How do I add a tooltip so that when you hover over one of the bars, the data number it represents is shown.
2 answers
solution1
1 ACCPTED 2016-06-28 07:58:31
There are some plugins which are available like @mbox suggests foxToolTip and d3-tip etc.
Here I am not using any plugin, using CSS and JS to create it CSS
#myTooltip {
position: absolute;
text-align: left;
width: 80px;
height: auto;
min-height: 20px;
padding: 2px;
font: 12px sans-serif;
background-color: rgb(255, 255, 255);
border: 2px solid rgb(100, 161, 209);
color: #5E99BD;
border-radius: 8px 8px 8px 8px;
pointer-events: none;
padding: 11px;
}
#myTooltip:before {
box-sizing: border-box;
display: inline;
font-size: 18px;
width: 100%;
line-height: 1;
color: rgb(100, 161, 209);
content: "\25BC";
position: absolute;
text-align: center;
top: 100%;
left: -2px;
}
JS
You have to add one div which represents tooltip.
var tooplTipDiv = d3.select("body").append("div")
.attr("id", "myTooltip")
.style("opacity", 0);
And you should provide callbacks for mouseover and mouseout
var bars = canvas.selectAll("rect")
.data(April)
.enter()
.append("rect")
//add callbacks for onMouseOver and onMouseOut
.on("mouseover", onMouseOver)
.on("mouseout", onMouseOut)
.attr("width", emptyVar)
.attr("height", 50)
.attr("fill", function(d) {
return color(d)
})
.attr("y", function(d, i) {
return i * 55
})
And functions for mouseover and mouseout
function onMouseOver(d){
var tooltipDiv = d3.select("#myTooltip");
tooltipDiv.transition()
.duration(200)
.style("opacity", 1);
tooltipDiv.html( "your Content")
.style("left", (parseFloat(widthScale(d))) + "px")
.style("cursor", "pointer")
.style("top", function(d){
return d3.event.pageY - this.offsetHeight - 17 + "px"
})
.style("color", "#333333");
}
function onMouseOut(d){
var tooltipDiv = d3.select("#myTooltip");
tooltipDiv.transition()
.duration(500)
.style("opacity", 0);
}
If you have still some confusion, let me know, will post full working code.
solution2
0 2016-06-28 08:30:23
You might try foxToolTip.js
https://github.com/MichaelRFox/foxToolTip.js
Then all you would need to do is after you append the rect is add a unique Id
.attr('id', function(d, i) { return 'bar' + i }) .each(function (d, i) { foxToolTip.create('bar' + i, 'whatever html you want' })
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