How to handle context menu positioning in zoomed state using React Context menu?

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This article explains about how to handle context menu positioning in zoomed state using React Context Menu.
When implementing context menus in web applications, it’s important to ensure that the menu appears at the correct position, especially when the interface is zoomed in or out. This article provides a solution to adjust the context menu positioning based on the zoom level.

Problem Statement

The issue arises when the context menu is triggered in a zoomed interface. The clientX and clientY positions do not update according to the zoom scale, causing the context menu to appear at an incorrect location.

Solution

To address this problem, we need to calculate the scale factor of the zoom and adjust the clientX and clientY positions accordingly. Below is a code snippet that demonstrates how to achieve this:

import React from 'react';
import { ContextMenuComponent } from '@syncfusion/ej2-react-navigations';

// Define your menu items and animation settings
const menuItems = [/* ... */];
const animationSettings = {/* ... */};

// Add disabled state handler if needed
const addDisabled = (args) => {
  // Your logic here
};

// Define the ContextMenuComponent with necessary props
<ContextMenuComponent
  ref={contextMenuObj}
  target='#contextmenutarget'
  items={menuItems}
  animationSettings={animationSettings}
  beforeItemRender={addDisabled}
  onOpen={onOpen}
  beforeOpen={beforeOpen}
/>

// Helper function to get the scaled values
const getScaledValue = () => {
  const scaledElement = document.getElementsByTagName('html')[0];
  const transform = window.getComputedStyle(scaledElement).getPropertyValue('transform').split('(')[1];
  const scaleX = parseFloat(transform.split(',')[0]);
  const scaleY = parseFloat(transform.split(',')[3]);
  return { x: 1 / scaleX, y: 1 / scaleY };
};

// Adjust the position of the context menu on opening
const onOpen = (args) => {
  const scaledValue = getScaledValue();
  const boundingRect = document.getElementsByTagName('html')[0].getBoundingClientRect();
  const adjustedX = (clientX - boundingRect.left) * scaledValue.x;
  const adjustedY = (clientY - boundingRect.top) * scaledValue.y;
  args.element.style.top = adjustedY + 'px';
  args.element.style.left = adjustedX + 'px';
  args.element.classList.remove('e-m-hide');
};

// Prepare the context menu before opening
const beforeOpen = (args) => {
  if (args.event.target.className.indexOf('e-menu-item') > -1) {
    const boundRect = args.event.target.getBoundingClientRect();
    clientX = boundRect.left + boundRect.width;
    clientY = boundRect.top;
  } else {
    clientX = args.event.clientX;
    clientY = args.event.clientY;
  }
  args.element.classList.add('e-m-hide');
};

// CSS to hide the context menu initially
.e-m-hide {
  display: none !important;
}

Working Sample

To see the solution in action, you can refer to the provided sample link:

React Context Menu Positioning Sample

Additional References

Syncfusion ContextMenuComponent Documentation: ContextMenuComponent API
CSS Transform Property: MDN Web Docs - transform
React Refs and the DOM: React Documentation - Refs and the DOM

Conclusion

I hope you enjoyed learning how to implement filtering in Blazor DataGrid with QueryBuilder.

You can refer to our React Context Menu feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our React Context Menu example to understand how to create and manipulate data.

For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.

If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!

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