How to use Sankey diagram to show data flow in ECharts

How to use Sankey diagram to display data flow in ECharts

Introduction:
Data visualization is an important part of data analysis, which can analyze complex data through Visually displayed through charts and other methods. ECharts is a powerful data visualization library that supports multiple chart types, among which Sankey Diagram can very intuitively display the flow relationship of data. This article will introduce how to use Sankey diagrams to display data flow in ECharts and provide specific code examples.

1. Introducing the ECharts library
   First, we need to introduce the ECharts library. It can be imported through CDN, or the ECharts library can be downloaded locally and imported. The following example uses CDN import as an example:

   <script src="https://cdn.jsdelivr.net/npm/echarts@5.2.1/dist/echarts.min.js"></script>

2. Create container
   Create a div container to display the Sankey diagram:

   <div id="sankeyChart" style="width: 800px; height: 600px;"></div>

3. Prepare data
   Prepare data for display. The data format needs to comply with the requirements of ECharts Sankey chart. The following is a sample data:

   var data = {
    nodes: [
        {name: '节点1'},
        {name: '节点2'},
        {name: '节点3'},
        {name: '节点4'}
    ],
    links: [
        {source: '节点1', target: '节点2', value: 100},
        {source: '节点1', target: '节点3', value: 200},
        {source: '节点2', target: '节点3', value: 150},
        {source: '节点3', target: '节点4', value: 120}
    ]
   };

   Nodes represent the source or destination of data, and links represent the connection relationship between nodes and the flow of data. Each node must contain a name attribute, links must contain source and target attributes, and value indicates the size of the data traffic.

4. Initialize chart
   Use the ECharts library method to initialize a Sankey chart:

   var chart = echarts.init(document.getElementById('sankeyChart'));
   
   // 设置图表配置项
   var option = {
    series: [{
        type: 'sankey',
        data: data.nodes,
        links: data.links
    }]
   };
   
   // 渲染图表
   chart.setOption(option);

5. Customized configuration
   According to needs, we can customize it Define the style and configuration of the chart. The following are some commonly used configuration items:
6. tooltip: Configuration of the prompt box when the mouse hovers over a node or connecting line.
7. color: Color configuration of nodes and connecting lines.
8. label: Configuration of node name and connection line data display.
9. layout: Configuration of chart layout, you can change the display mode of the chart by adjusting the position of nodes.

10. Data update
    If you need to dynamically update data, you can achieve it through the following methods:

    // 更新数据
    data.nodes.push({name: '节点5'});
    data.links.push({source: '节点4', target: '节点5', value: 80});
    
    // 更新图表配置
    option.series[0].data = data.nodes;
    option.series[0].links = data.links;
    
    // 重新渲染图表
    chart.setOption(option);

Summary:
This article introduces how to update data in ECharts The Sankey diagram is used to display the data flow. By introducing the ECharts library, creating a container, preparing data, and initializing the chart, the data flow relationship can be visually displayed. At the same time, we also learned about custom configuration and data update methods. I hope it can help readers better use ECharts for data visualization analysis.

The above is the detailed content of How to use Sankey diagram to show data flow in ECharts. For more information, please follow other related articles on the PHP Chinese website!