Tips for incorporating tool-tips into a vertical grouped bar chart using d3 js

I have successfully created a simple vertical grouped bar chart using the code provided below. Now, I want to enhance it by adding tooltips that display specific data about each bar when hovered over. Can anyone assist me with this? Any help is greatly appreciated. Thank you in advance :)

 
    var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
    
    var x0 = d3.scale.ordinal()
    .rangeRoundBands([0, width], .1);
    
    var x1 = d3.scale.ordinal();
    
    
    var y = d3.scale.linear()
    .range([height, 0]);
    
    
    var color = d3.scale.ordinal()
    .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);
    
    
    var xAxis = d3.svg.axis()
    .scale(x0)
    .orient("bottom");
    
    var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left")
    .tickFormat(d3.format(".2s"));
    
    
    // Rest of the code


body {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.bar {
  fill: steelblue;
}

.x.axis path {
  display: none;
}
<body></body>

javascriptcssd3.jstooltip

Answer №1

Step 1: Incorporate letter details into the groups dataset.

data.forEach(function(d) {
  d.groups = groupNames.map(function(name) {
    return {
      name: name,
      letter: d.letter,
      value: +d[name]
    };
  })
});

Step 2: Add titles to the bar elements.

.append("title")
.text(function(d,i){
     var name = d.name.replace(/^./,d.name[0].toUpperCase());
     return "Letter : "+d.letter+" \n"+name+" : "+d.value;
});


var margin = {
    top: 20,
    right: 20,
    bottom: 30,
    left: 40
  },
  width = 960 - margin.left - margin.right,
  height = 500 - margin.top - margin.bottom;

var x0 = d3.scale.ordinal()
  .rangeRoundBands([0, width], .1);

var x1 = d3.scale.ordinal();


var y = d3.scale.linear()
  .range([height, 0]);


var color = d3.scale.ordinal()
  .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);


var xAxis = d3.svg.axis()
  .scale(x0)
  .orient("bottom");

var yAxis = d3.svg.axis()
  .scale(y)
  .orient("left")
  .tickFormat(d3.format(".2s"));


//console.log(margin.left);
var svg = d3.select("body").append("svg")
  .attr("width", width + margin.left + margin.right)
  .attr("height", height + margin.top + margin.bottom)
  .append("g")
  .attr("transform", "translate(" + margin.left + "," + margin.top + ")");


var data = [{
  letter: "A",
  frequency: .08167,
  depth: .32
}, {
  letter: "B",
  frequency: .01492,
  depth: .69
}];

var groupNames = d3.keys(data[0]).filter(function(key) {
  return key != "letter";
})

data.forEach(function(d) {
  d.groups = groupNames.map(function(name) {
    return {
      name: name,
      letter: d.letter,
      value: +d[name]
    };
  })
});



x0.domain(data.map(function(d) {  
  return d.letter;
}));
x1.domain(groupNames).rangeRoundBands([0, x0.rangeBand()]);

y.domain([0, d3.max(data, function(d) {
  return d3.max(d.groups, function(d) {
    return d.value;
  });
})]);

svg.append("g")
  .attr("class", "x axis")
  .attr("transform", "translate(0," + height + ")")
  .call(xAxis);

svg.append("g")
  .attr("class", "y axis")
  .call(yAxis)
  .append("text")
  .attr("transform", "rotate(-90)")
  .attr("y", 6)
  .attr("dy", ".71em")
  .style("text-anchor", "end")
  .text("Letter Fun");

var letter = svg.selectAll(".letter")
  .data(data)
  .enter().append("g")
  .attr("class", "g")
  .attr("transform", function(d) {
    return "translate(" + x0(d.letter) + ",0)";
  });

letter.selectAll("rect")
  .data(function(d) {
    return d.groups;
  })
  .enter().append("rect")
  .attr("width", x1.rangeBand())
  .attr("x", function(d) {    
    return x1(d.name);
  })
  .attr("y", function(d) {
    return y(d.value);
  })
  .attr("height", function(d) {
    return height - y(d.value);
  })
  .style("fill", function(d) {
    return color(d.name);
  })
  .append("title")
  .text(function(d,i){
     var name = d.name.replace(/^./,d.name[0].toUpperCase());
     return "Letter : "+d.letter+" \n"+name+" : "+d.value;
   });

letter.selectAll("text")
  .data(function(d) {
    return d.groups;
  })
  .enter().append("text")
  .attr("class", "barstext")
  .attr("x", function(d) {
    return x1(d.name);
  })
  .attr("y", function(d) {
    return y(d.value);
  })
  .text(function(d) {
    return d.value;
  })

var legend = svg.selectAll(".legend")
  .data(groupNames.slice().reverse())
  .enter().append("g")
  .attr("class", "legend")
  .attr("transform", function(d, i) {
    return "translate(0," + i * 20 + ")";
  });

legend.append("rect")
  .attr("x", width - 18)
  .attr("width", 18)
  .attr("height", 18)
  .style("fill", color);

legend.append("text")
  .attr("x", width - 24)
  .attr("y", 9)
  .attr("dy", ".35em")
  .style("text-anchor", "end")
  .text(function(d) {
    return d;
  });
body {
  font: 10px sans-serif;
}
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
.bar {
  fill: steelblue;
}
.x.axis path {
  display: none;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>

<body></body>

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