#dynamic charts

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Charts are far better for displaying data visually than tables and have the added benefit that no one is ever going to press-gang them into use as a layout tool. They’re easier to look at and convey data quickly, but they’re not always easy to create. A great way to get started with charts is with Chart.js, a JavaScript plugin that uses HTML5′s canvas element to draw the graph onto the page. It’s a well documented plugin that makes using all kinds of bar charts, line charts, pie charts and more, incredibly easy. To see how to use chart.js we’re going to create a set of 3 graphs; one will show the number of buyers a fictional product has over the course of 6 months, this will be a line chart; the second will show which countries the customers come from, this will be the pie chart; finally we’ll use a bar chart to show profit over the period. Setting up The first thing we need to do is download Chart.js. Copy the Chart.min.js out of the unzipped folder and into the directory you’ll be working in. Then create a new html page and import the script: Chart.js demo   Drawing a line chart To draw a line chart, the first thing we need to do is create a canvas element in our HTML in which Chart.js can draw our chart. So add this to the body of our HTML page: Next, we need to write a script that will retrieve the context of the canvas, so add this to the foot of your body element: (We can actually pass some options to the chart via the Line method, but we’re going to stick to the data for now to keep it simple.) Inside the same script tags we need to create our data, in this instance it’s an object that contains labels for the base of our chart and datasets to describe the values on the chart. Add this immediately above the line that begins ‘var buyers=’: var buyerData = { labels : ["January","February","March","April","May","June"], datasets : [ { fillColor : "rgba(172,194,132,0.4)", strokeColor : "#ACC26D", pointColor : "#fff", pointStrokeColor : "#9DB86D", data : [203,156,99,251,305,247] } ] } If you test your file in a browser you’ll now see a cool animated line graph.   Drawing a pie chart Our line chart is complete, so let’s move on to our pie chart. First, we need the canvas element: Next, we need to get the context and to instantiate the chart: var countries= document.getElementById("countries").getContext("2d"); new Chart(countries).Pie(pieData, pieOptions); You’ll notice that this time, we are going to supply some options to the chart. Next we need to create the data. This data is a little different to the line chart because the pie chart is simpler, we just need to supply a value and a color for each section: var pieData = [ { value: 20, color:"#878BB6" }, { value : 40, color : "#4ACAB4" }, { value : 10, color : "#FF8153" }, { value : 30, color : "#FFEA88" } ]; Now, immediately after the pieData we’ll add our options: var pieOptions = { segmentShowStroke : false, animateScale : true } These options do two things, first they remove the stroke from the segments, and then they animate the scale of the pie so that it zooms out from nothing.   Drawing a bar chart Finally, let’s add  a bar chart to our page. Happily the syntax for the bar chart is very similar to the line chart we’ve already added. First, we add the canvas element: Next, we retrieve the element and create the graph: var income = document.getElementById("income").getContext("2d"); new Chart(income).Bar(barData); And finally, we add in the bar chart’s data: var barData = { labels : ["January","February","March","April","May","June"], datasets : [ { fillColor : "#48A497", strokeColor : "#48A4D1", data : [456,479,324,569,702,600] }, { fillColor : "rgba(73,188,170,0.4)", strokeColor : "rgba(72,174,209,0.4)", data : [364,504,605,400,345,320] } ] } As you can see, the data is largely the same, except this time we’ve chosen to use RGBA to specify our colors which allows us to add transparency.   Conclusion You can view a demo of this in action here, and if you prefer copy and paste, here is the full script: Chart.js demo The great things about Chart.js are that it’s simple to use and really very flexible. Plus, once you’ve mastered the basics here, you’ll discover that there are tons of options listed in the documentation.   Have you used Chart.js? Do you prefer a different solution? Let us know in the comments. Add Ornamental Elegance with the Fleuron Font – only $12! Source      http://dlvr.it/4G3pZm www.regulardomainname.com