How to use Sankey diagram to show data flow in ECharts
Dec 17, 2023 am 09:38 AM
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.
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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>
Create container
Create a div container to display the Sankey diagram:<div id="sankeyChart" style="width: 800px; height: 600px;"></div>
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: '節(jié)點1'}, {name: '節(jié)點2'}, {name: '節(jié)點3'}, {name: '節(jié)點4'} ], links: [ {source: '節(jié)點1', target: '節(jié)點2', value: 100}, {source: '節(jié)點1', target: '節(jié)點3', value: 200}, {source: '節(jié)點2', target: '節(jié)點3', value: 150}, {source: '節(jié)點3', target: '節(jié)點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.
Initialize chart
Use the ECharts library method to initialize a Sankey chart:var chart = echarts.init(document.getElementById('sankeyChart')); // 設置圖表配置項 var option = { series: [{ type: 'sankey', data: data.nodes, links: data.links }] }; // 渲染圖表 chart.setOption(option);- 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: - tooltip: Configuration of the prompt box when the mouse hovers over a node or connecting line.
- color: Color configuration of nodes and connecting lines.
- label: Configuration of node name and connection line data display.
- layout: Configuration of chart layout, you can change the display mode of the chart by adjusting the position of nodes.
Data update
If you need to dynamically update data, you can achieve it through the following methods:// 更新數據 data.nodes.push({name: '節(jié)點5'}); data.links.push({source: '節(jié)點4', target: '節(jié)點5', value: 80}); // 更新圖表配置 option.series[0].data = data.nodes; option.series[0].links = data.links; // 重新渲染圖表 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.
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