A line chart with tooltip based on Mike Bostock's X-Value Mouseover. Notice the tooltip is jumpy. Refer to part 2 for a smoother tooltip.
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November 5, 2019 03:26
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Line Chart with Tooltip 1
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| date | likes | |
|---|---|---|
| 10/1/2015 | 30303 | |
| 10/2/2015 | 30452 | |
| 10/3/2015 | 30568 | |
| 10/4/2015 | 30598 | |
| 10/5/2015 | 30798 | |
| 10/6/2015 | 31002 | |
| 10/7/2015 | 31376 | |
| 10/8/2015 | 32661 | |
| 10/9/2015 | 32875 | |
| 10/10/2015 | 33088 | |
| 10/11/2015 | 33500 | |
| 10/12/2015 | 33612 | |
| 10/13/2015 | 33813 | |
| 10/14/2015 | 34138 | |
| 10/15/2015 | 34256 | |
| 10/16/2015 | 35013 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 10px "Helvetica Neue", Helvetica, Arial, sans-serif; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .x.axis path { | |
| display: none; | |
| } | |
| .line { | |
| fill: none; | |
| stroke: steelblue; | |
| stroke-width: 1.5px; | |
| } | |
| .overlay { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| .focus circle { | |
| fill: steelblue; | |
| } | |
| .focus text { | |
| font-size: 14px; | |
| } | |
| .tooltip { | |
| fill: white; | |
| stroke: #000; | |
| } | |
| .tooltip-date, .tooltip-likes { | |
| font-weight: bold; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var margin = { top: 30, right: 120, bottom: 30, left: 50 }, | |
| width = 960 - margin.left - margin.right, | |
| height = 500 - margin.top - margin.bottom, | |
| tooltip = { width: 100, height: 100, x: 10, y: -30 }; | |
| var parseDate = d3.time.format("%m/%e/%Y").parse, | |
| bisectDate = d3.bisector(function(d) { return d.date; }).left, | |
| formatValue = d3.format(","), | |
| dateFormatter = d3.time.format("%m/%d/%y"); | |
| var x = d3.time.scale() | |
| .range([0, width]); | |
| var y = d3.scale.linear() | |
| .range([height, 0]); | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom") | |
| .tickFormat(dateFormatter); | |
| var yAxis = d3.svg.axis() | |
| .scale(y) | |
| .orient("left") | |
| .tickFormat(d3.format("s")) | |
| var line = d3.svg.line() | |
| .x(function(d) { return x(d.date); }) | |
| .y(function(d) { return y(d.likes); }); | |
| 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 + ")"); | |
| d3.tsv("data.tsv", function(error, data) { | |
| if (error) throw error; | |
| data.forEach(function(d) { | |
| d.date = parseDate(d.date); | |
| d.likes = +d.likes; | |
| }); | |
| data.sort(function(a, b) { | |
| return a.date - b.date; | |
| }); | |
| x.domain([data[0].date, data[data.length - 1].date]); | |
| y.domain(d3.extent(data, function(d) { return d.likes; })); | |
| 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("Number of Likes"); | |
| svg.append("path") | |
| .datum(data) | |
| .attr("class", "line") | |
| .attr("d", line); | |
| var focus = svg.append("g") | |
| .attr("class", "focus") | |
| .style("display", "none"); | |
| focus.append("circle") | |
| .attr("r", 5); | |
| focus.append("rect") | |
| .attr("class", "tooltip") | |
| .attr("width", 100) | |
| .attr("height", 50) | |
| .attr("x", 10) | |
| .attr("y", -22) | |
| .attr("rx", 4) | |
| .attr("ry", 4); | |
| focus.append("text") | |
| .attr("class", "tooltip-date") | |
| .attr("x", 18) | |
| .attr("y", -2); | |
| focus.append("text") | |
| .attr("x", 18) | |
| .attr("y", 18) | |
| .text("Likes:"); | |
| focus.append("text") | |
| .attr("class", "tooltip-likes") | |
| .attr("x", 60) | |
| .attr("y", 18); | |
| svg.append("rect") | |
| .attr("class", "overlay") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mouseover", function() { focus.style("display", null); }) | |
| .on("mouseout", function() { focus.style("display", "none"); }) | |
| .on("mousemove", mousemove); | |
| function mousemove() { | |
| var x0 = x.invert(d3.mouse(this)[0]), | |
| i = bisectDate(data, x0, 1), | |
| d0 = data[i - 1], | |
| d1 = data[i], | |
| d = x0 - d0.date > d1.date - x0 ? d1 : d0; | |
| focus.attr("transform", "translate(" + x(d.date) + "," + y(d.likes) + ")"); | |
| focus.select(".tooltip-date").text(dateFormatter(d.date)); | |
| focus.select(".tooltip-likes").text(formatValue(d.likes)); | |
| } | |
| }); | |
| </script> |
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Are there any dependencies other than //d3js.org/d3.v3.min.js? I'm not able to get this to work when i try to put it into my project..
Its failing with
Uncaught TypeError: Cannot read property 'sourceEvent' of nullin themousemove, specificallyd3.mouse(this).Any help is much appreciated
edit: nevermind, the issue was on my end. Your code is great, thanks!