Add tooltip option to SSR chart with ECharts

When working with ECharts in a server-side rendered (SSR) environment, you might encounter challenges in adding tooltip functionality to your charts. In this blog post, we will explore different solutions to this problem and provide code snippets for each solution.

Solution 1: Using ECharts’ setOption method

The first solution involves using ECharts’ setOption method to add the tooltip option to your chart configuration. Here’s an example:

import echarts from 'echarts';

// Create a new chart instance
const chart = echarts.init(document.getElementById('chart'));

// Define your chart configuration
const chartOptions = {
  // ... other chart options
  tooltip: {
    // ... tooltip configuration
  },
  // ... other chart configurations
};

// Set the chart options
chart.setOption(chartOptions);
  

This solution allows you to directly add the tooltip option to your chart configuration and set it using the setOption method. Make sure to replace ‘chart’ with the ID of your chart container element.

Solution 2: Using ECharts’ getInstanceByDom method

If you are working with an existing chart instance and want to add the tooltip option dynamically, you can use the getInstanceByDom method provided by ECharts. Here’s an example:

import echarts from 'echarts';

// Get the chart instance by DOM element
const chart = echarts.getInstanceByDom(document.getElementById('chart'));

// Add the tooltip option to the existing chart configuration
chart.setOption({
  tooltip: {
    // ... tooltip configuration
  },
});
  

This solution is useful when you want to modify an existing chart instance and add the tooltip option to it. Again, replace ‘chart’ with the ID of your chart container element.

Solution 3: Using ECharts’ registerMap method

If you are using ECharts’ registerMap method to register custom maps, you can also add the tooltip option during the registration process. Here’s an example:

import echarts from 'echarts';

// Register a custom map with tooltip option
echarts.registerMap('customMap', {
  tooltip: {
    // ... tooltip configuration
  },
  // ... map data
});
  

This solution is specifically for registering custom maps with the tooltip option. Replace ‘customMap’ with the name of your custom map and configure the tooltip option accordingly.

Conclusion

Adding tooltip functionality to your SSR chart with ECharts can be achieved using various methods. Whether you are creating a new chart instance, modifying an existing one, or registering custom maps, ECharts provides flexible solutions to meet your needs.

Remember to refer to the official ECharts documentation for more details and options regarding tooltips and other chart configurations.