A bar chart that updates live with new incoming data
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March 27, 2019 19:48
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Live-Updating Bar Chart
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| [ | |
| {"key":"Obama Spends Another Night Searching Behind White House Paintings For Safes", "value":99}, | |
| {"key":"Report: Average American Consuming 4 Ounces Of Cheese Right Now", "value":78}, | |
| {"key":"Colorado Legalizes Medicinal Fireworks", "value":77}, | |
| {"key":"15-Second Meals", "value":64}, | |
| {"key":"Statshot: Why Aren't We Going To Prom?", "value":35}, | |
| {"key":"Report: U.S. Still Leads World With Highest Density Of Kevins", "value":33}, | |
| {"key":"Xylophonist Shredding It", "value":29}, | |
| {"key":"Man Has Story For Every Stain On Pants", "value":28}, | |
| {"key":"Music Playing In Bar Could Stand To Be Louder, Worse", "value":25}, | |
| {"key":"Grandfathers Accidentally Switched At Hospital", "value":21}, | |
| {"key":"Visit Home Referred To As Vacation By Parents", "value":19}, | |
| {"key":"Area Man Cleans Apartment Once Every Relationship", "value":18}, | |
| {"key":"Horoscopes", "value":15}, | |
| {"key":"White Male Privilege Squandered On Job At Best Buy", "value":14}, | |
| {"key":"Something Happens in Ukraine", "value":11} | |
| ] |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <link rel="stylesheet" href="style.css"> | |
| </head> | |
| <body> | |
| <div id="everything"> | |
| <h1>What People Are Reading Right Now (Fake Data)</h1> | |
| <h2>Top 10 Articles by Concurrent Page Views</h2> | |
| <div id="chart"></div> | |
| <h2>Headlines borrowed from <a href="http://www.theonion.com/">theonion.com</a></h2> | |
| </div> | |
| <script> | |
| //updatingBarChart.js | |
| var setup = function(targetID){ | |
| //Set size of svg element and chart | |
| var margin = {top: 0, right: 0, bottom: 0, left: 0}, | |
| width = 600 - margin.left - margin.right, | |
| height = 400 - margin.top - margin.bottom, | |
| categoryIndent = 4*15 + 5, | |
| defaultBarWidth = 2000; | |
| //Set up scales | |
| var x = d3.scale.linear() | |
| .domain([0,defaultBarWidth]) | |
| .range([0,width]); | |
| var y = d3.scale.ordinal() | |
| .rangeRoundBands([0, height], 0.1, 0); | |
| //Create SVG element | |
| d3.select(targetID).selectAll("svg").remove() | |
| var svg = d3.select(targetID).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 + ")"); | |
| //Package and export settings | |
| var settings = { | |
| margin:margin, width:width, height:height, categoryIndent:categoryIndent, | |
| svg:svg, x:x, y:y | |
| } | |
| return settings; | |
| } | |
| var redrawChart = function(targetID, newdata) { | |
| //Import settings | |
| var margin=settings.margin, width=settings.width, height=settings.height, categoryIndent=settings.categoryIndent, | |
| svg=settings.svg, x=settings.x, y=settings.y; | |
| //Reset domains | |
| y.domain(newdata.sort(function(a,b){ | |
| return b.value - a.value; | |
| }) | |
| .map(function(d) { return d.key; })); | |
| var barmax = d3.max(newdata, function(e) { | |
| return e.value; | |
| }); | |
| x.domain([0,barmax]); | |
| ///////// | |
| //ENTER// | |
| ///////// | |
| //Bind new data to chart rows | |
| //Create chart row and move to below the bottom of the chart | |
| var chartRow = svg.selectAll("g.chartRow") | |
| .data(newdata, function(d){ return d.key}); | |
| var newRow = chartRow | |
| .enter() | |
| .append("g") | |
| .attr("class", "chartRow") | |
| .attr("transform", "translate(0," + height + margin.top + margin.bottom + ")"); | |
| //Add rectangles | |
| newRow.insert("rect") | |
| .attr("class","bar") | |
| .attr("x", 0) | |
| .attr("opacity",0) | |
| .attr("height", y.rangeBand()) | |
| .attr("width", function(d) { return x(d.value);}) | |
| //Add value labels | |
| newRow.append("text") | |
| .attr("class","label") | |
| .attr("y", y.rangeBand()/2) | |
| .attr("x",0) | |
| .attr("opacity",0) | |
| .attr("dy",".35em") | |
| .attr("dx","0.5em") | |
| .text(function(d){return d.value;}); | |
| //Add Headlines | |
| newRow.append("text") | |
| .attr("class","category") | |
| .attr("text-overflow","ellipsis") | |
| .attr("y", y.rangeBand()/2) | |
| .attr("x",categoryIndent) | |
| .attr("opacity",0) | |
| .attr("dy",".35em") | |
| .attr("dx","0.5em") | |
| .text(function(d){return d.key}); | |
| ////////// | |
| //UPDATE// | |
| ////////// | |
| //Update bar widths | |
| chartRow.select(".bar").transition() | |
| .duration(300) | |
| .attr("width", function(d) { return x(d.value);}) | |
| .attr("opacity",1); | |
| //Update data labels | |
| chartRow.select(".label").transition() | |
| .duration(300) | |
| .attr("opacity",1) | |
| .tween("text", function(d) { | |
| var i = d3.interpolate(+this.textContent.replace(/\,/g,''), +d.value); | |
| return function(t) { | |
| this.textContent = Math.round(i(t)); | |
| }; | |
| }); | |
| //Fade in categories | |
| chartRow.select(".category").transition() | |
| .duration(300) | |
| .attr("opacity",1); | |
| //////// | |
| //EXIT// | |
| //////// | |
| //Fade out and remove exit elements | |
| chartRow.exit().transition() | |
| .style("opacity","0") | |
| .attr("transform", "translate(0," + (height + margin.top + margin.bottom) + ")") | |
| .remove(); | |
| //////////////// | |
| //REORDER ROWS// | |
| //////////////// | |
| var delay = function(d, i) { return 200 + i * 30; }; | |
| chartRow.transition() | |
| .delay(delay) | |
| .duration(900) | |
| .attr("transform", function(d){ return "translate(0," + y(d.key) + ")"; }); | |
| }; | |
| //Pulls data | |
| //Since our data is fake, adds some random changes to simulate a data stream. | |
| //Uses a callback because d3.json loading is asynchronous | |
| var pullData = function(settings,callback){ | |
| d3.json("fakeData.json", function (err, data){ | |
| if (err) return console.warn(err); | |
| var newData = data; | |
| data.forEach(function(d,i){ | |
| var newValue = d.value + Math.floor((Math.random()*10) - 5) | |
| newData[i].value = newValue <= 0 ? 10 : newValue | |
| }) | |
| newData = formatData(newData); | |
| callback(settings,newData); | |
| }) | |
| } | |
| //Sort data in descending order and take the top 10 values | |
| var formatData = function(data){ | |
| return data.sort(function (a, b) { | |
| return b.value - a.value; | |
| }) | |
| .slice(0, 10); | |
| } | |
| //I like to call it what it does | |
| var redraw = function(settings){ | |
| pullData(settings,redrawChart) | |
| } | |
| //setup (includes first draw) | |
| var settings = setup('#chart'); | |
| redraw(settings) | |
| //Repeat every 3 seconds | |
| setInterval(function(){ | |
| redraw(settings) | |
| }, 3000); | |
| </script> | |
| </body> |
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| MIT License | |
| Copyright (c) 2019 Charlie Guthrie | |
| Permission is hereby granted, free of charge, to any person obtaining a copy | |
| of this software and associated documentation files (the "Software"), to deal | |
| in the Software without restriction, including without limitation the rights | |
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| copies of the Software, and to permit persons to whom the Software is | |
| furnished to do so, subject to the following conditions: | |
| The above copyright notice and this permission notice shall be included in all | |
| copies or substantial portions of the Software. | |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
| SOFTWARE. |
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| html, body, div, span, applet, object, iframe, | |
| h1, h2, h3, h4, h5, h6, p, blockquote, pre, | |
| a, abbr, acronym, address, big, cite, code, | |
| del, dfn, em, img, ins, kbd, q, s, samp, | |
| small, strike, strong, sub, sup, tt, var, | |
| b, u, i, center, | |
| dl, dt, dd, ol, ul, li, | |
| fieldset, form, label, legend, | |
| table, caption, tbody, tfoot, thead, tr, th, td, | |
| article, aside, canvas, details, embed, | |
| figure, figcaption, footer, header, hgroup, | |
| menu, nav, output, ruby, section, summary, | |
| time, mark, audio, video { | |
| margin: 0; | |
| padding: 0; | |
| border: 0; | |
| font: inherit; | |
| font-size: 100%; | |
| vertical-align: baseline; | |
| font-family: "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; | |
| font-weight: inherit; | |
| } | |
| h1 { | |
| font-size:150%; | |
| font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; | |
| font-weight: 300; | |
| text-align: left; | |
| margin-top: 5px; | |
| margin-bottom: 5px; | |
| } | |
| h2 { | |
| font-size: 12px; | |
| font-style: italic; | |
| color: gray; | |
| margin-top:5px; | |
| margin-bottom:5px; | |
| } | |
| #everything{ | |
| width:600px; | |
| margin:20px; | |
| } | |
| #chart{ | |
| width:600px; | |
| height:400px; | |
| } | |
| .bar{ | |
| fill:#eaeaea; | |
| } | |
| text.label{ | |
| fill: #777777; | |
| color: #777777; | |
| font-size: 20px; | |
| font-weight: bold; | |
| } | |
| text.category{ | |
| fill: #666666; | |
| font-size: 14px; | |
| } | |
Hi @Prabingiri, I'm sorry I never responded; I didn't see your note. The code is designed to take in .json format data, not php. Can you put your data into json format and save as a .json file?
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WOW, thank you very much for such a wonderful project. Helped a lot. But, I got you a question. While I tried to replace the "fakeData.json" "fakedata.php", I am not getting anything in the output. What's my problem, have you tried it man? All I want is to retrieve the data from mysql but it is not working. By the way, If I copied the Json output of PHP to the data file, It works fine. But giving the direct file name produces no result. Help me out man.