Dojo官方教程：Charting

原创于 2021-02-22 15:48:53 发布 · 307 阅读

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这篇教程展示了如何通过编程方式而非声明式来创建饼图。代码示例使用了Dojo库，创建了一个基于一周网站访问量数据的饼图。这种方式确保了图表创建的稳定性和可控性。

实现了用程序代码来创建饼图，而不是用声明式。教程里面说：建议用代码而不是声明式的，代码的创建方式更稳定更可控。

代码如下：

<!DOCTYPE HTML>
<html lang="en">
   <head>
       <meta charset="utf-8">
       <title>Demo: Basic Programmatic Chart</title>
       <link rel="stylesheet" href="css/style.css" media="screen">
   </head>
   <body>
       <h1>Demo: Basic Programmatic Chart</h1>

       
       <div id="chartNode" style="width: 550px; height: 550px;"></div>

       
       <script src="dojo/dojo.js" data-dojo-config="isDebug: 1, async: 1, parseOnLoad: 1"></script>
       <script>

           // x and y coordinates used for easy understanding of where they should display
           // Data represents website visits over a week period
           chartData = [
               { x: 1, y: 19021 },
               { x: 1, y: 12837 },
               { x: 1, y: 12378 },
               { x: 1, y: 21882 },
               { x: 1, y: 17654 },
               { x: 1, y: 15833 },
               { x: 1, y: 16122 }
           ];

           require([
               // Require the basic 2d chart resource
               "dojox/charting/Chart",

               // Require the theme of our choosing
               "dojox/charting/themes/Claro",

// Charting plugins:

// Require the Pie type of Plot
"dojox/charting/plot2d/Pie",

               // Wait until the DOM is ready
               "dojo/domReady!"
           ], function(Chart, theme, PiePlot){

               // Create the chart within it's "holding" node
               var pieChart = new Chart("chartNode");

               // Set the theme
               pieChart.setTheme(theme);

               // Add the only/default plot
               pieChart.addPlot("default", {
                   type: PiePlot, // our plot2d/Pie module reference as type value
                   radius: 200,
                   fontColor: "black",
                   labelOffset: -20
               });

               // Add the series of data
               pieChart.addSeries("January",chartData);

// Render the chart!
pieChart.render();

           });
       </script>
   </body>
</html>

实现效果如下：