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How to use rectangular tree diagram to display data structure in ECharts

王林

Dec 18, 2023 pm 01:44 PM

data structureechartsRectangular tree diagram

How to use rectangular tree diagram to display data structure in ECharts

Rectangular tree diagram is a commonly used data visualization method, which can clearly display the relationship between data structures hierarchical relationship and able to highlight the importance of each node. In this article, we will introduce how to use the rectangular tree diagram component in the ECharts library to display data structures and provide specific code examples.

First, we need to prepare the data structure to be displayed. Rectangular treemaps are typically represented using a tree data structure, with each node containing a unique identifier and data associated with it. In this example, we will build a simple student information data structure. Each node represents a student and contains three fields: name, age and grades. The following is a sample data structure:

var data = {
  name: 'root',
  children: [
    {
      name: '张三',
      age: 18,
      score: 90
    },
    {
      name: '李四',
      age: 19,
      score: 95
    },
    // 更多学生节点...
  ]
};

After preparing the data structure, we need to introduce the ECharts library into the page and create a container to host the rectangular tree map. The following is a simple HTML code example:

<!DOCTYPE html>
<html>
<head>
  <title>矩形树图示例</title>
  <script src="https://cdn.jsdelivr.net/npm/echarts/dist/echarts.min.js"></script>
</head>
<body>
  <div id="chart" style="width: 800px; height: 600px;"></div>
  <script src="treechart.js"></script>
</body>
</html>

In the above code, we introduced the ECharts library through the script tag and created an ID with the ID chart div element to host the rectangular tree map.

Next, we need to write the actual code in the JavaScript file to generate the rectangular treemap. The following is a complete code example:

var myChart = echarts.init(document.getElementById('chart'));

var option = {
  series: [{
    type: 'treemap',
    label: {
      show: true,
      formatter: '{b}'
    },
    data: [data]
  }]
};

myChart.setOption(option);

The above code initializes an ECharts instance through the echarts.init method, and obtains a rectangular tree map through the getOption method basic configuration items. The type attribute in the configuration item indicates the use of the treemap rectangular treemap component, the label attribute is used to set the display mode of node labels, data Properties are used to pass in data structures.

Finally, we apply the configuration items to the ECharts instance through the setOption method to generate a rectangular tree map. After running the code, you can see a rectangular tree diagram showing student information on the page.

To summarize, the process of using the rectangular treemap component of ECharts to display the data structure mainly includes preparing the data structure, introducing the ECharts library, creating a container to host the rectangular treemap, and writing code to generate the rectangular treemap. Configuration items and apply them to the ECharts instance. Through the above steps, we can easily use ECharts to display various complex data structures and perform visual analysis.

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