HTML2Canvas 'then' is not a Function Error: Troubleshooting Guide

The error 'html2canvas(...).then is not a function' arises when you attempt to use the '.then()' method on a variable or object that isn't a Promise. Here's a breakdown of the reasons and solutions:

1. Incorrect html2canvas Usage:

   • Ensure you've included the html2canvas library script in your HTML file.
   • Double-check that you're calling the 'html2canvas()' function correctly.

2. Compatibility Issues:

   • Verify the html2canvas version you're using is compatible with your browser. Older versions might have issues with Promises.

3. Promise Support:

   • Confirm your browser supports Promises. If using an outdated browser, consider using a polyfill or updating your browser.

Example of Correct Usage:

html2canvas(document.querySelector('#elementId')).then(function(canvas) {
  // Use the generated canvas here
}).catch(function(error) {
  // Handle any error during canvas generation
});

Ensure you follow a similar structure and call '.then()' on the 'html2canvas()' function appropriately.