Mui Datagrid Check If Grid Is Finished Re Rendering

Caroline Mae

2 min read

·

01-01-2025

6

0

Share

Working with the Material UI (MUI) Datagrid often involves scenarios where you need to perform actions after the grid has finished re-rendering. This is crucial for operations like accessing updated data or manipulating the DOM after changes. However, MUI Datagrid doesn't offer a direct, built-in method to detect the end of a re-render cycle. So, how do we achieve this?

Understanding the Re-rendering Process

The MUI Datagrid re-renders whenever its underlying data or properties change. This is a fundamental aspect of React's behavior. Directly querying for a "re-render complete" flag isn't feasible. Instead, we need to leverage React's lifecycle methods or state management techniques to infer the completion of the re-rendering process.

Method 1: Using useEffect with a Dependency Array

The useEffect hook provides a powerful mechanism to perform side effects after a component has rendered. By carefully defining the dependency array, we can trigger a function only after relevant data changes have settled.

import { useEffect, useState } from 'react';
import { DataGrid } from '@mui/x-data-grid';

const MyComponent = ({ data }) => {
  const [dataReady, setDataReady] = useState(false);

  useEffect(() => {
    // Simulate an asynchronous operation after data changes
    const timeoutId = setTimeout(() => {
      setDataReady(true);
    }, 100); // Adjust the delay as needed

    return () => clearTimeout(timeoutId);
  }, [data]);

  if (!dataReady) {
    return <p>Loading...</p>;
  }

  return (
    <DataGrid
      rows={data}
      columns={columns}
      pageSize={5}
      rowsPerPageOptions={[5]}
      checkboxSelection
    />
  );
};

In this example, useEffect is triggered whenever the data prop changes. The setTimeout function simulates an asynchronous operation – representing the time needed for the grid to fully render. Once the timeout completes, dataReady is set to true, allowing the component to proceed with actions dependent on the fully rendered grid. The cleanup function ensures that any pending timeouts are cancelled if the component unmounts. Adjust the timeout value according to your data size and rendering performance.

Method 2: Ref and Callback Approach

An alternative is using a ref to access the DOM element directly and a callback function that signals when the rendering is complete. This approach is more granular, allowing for control of the completion event.

import { useRef, useEffect } from 'react';
import { DataGrid } from '@mui/x-data-grid';

const MyComponent = ({ data }) => {
  const gridRef = useRef(null);

  useEffect(() => {
      // Trigger an action when the grid is ready.
      if (gridRef.current) {
        console.log("Grid Ready!")
        //Access gridRef.current to perform DOM operations
      }
  }, [data]);

    return (
      <DataGrid
          ref={gridRef}
          rows={data}
          columns={columns}
          pageSize={5}
          rowsPerPageOptions={[5]}
          checkboxSelection
      />
    );
};

This approach uses a ref to get a direct reference to the DataGrid component. The useEffect hook checks if the ref is populated, indicating that the grid is mounted and ready. The code inside then performs the necessary actions. This method is useful when you need to directly interact with the DOM elements of the grid.

Choosing the Right Method

The best approach depends on your specific needs:

• useEffect with dependency array: Suitable for simple scenarios where you need to perform actions after the grid re-renders, without needing direct DOM manipulation.
• Ref and callback: More suitable when precise control and direct DOM access are required.

Remember that both methods rely on inferred completion; there's no guarantee of absolute precision. For extremely complex or performance-sensitive applications, consider more sophisticated state management solutions or exploring alternative grid components. Thorough testing is vital to ensure your chosen method behaves correctly in various situations.