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To invoke a JavaScript function within Flutter Web, we can use the dart:js library. Here's an example:

1. Import the dart:js library at the top of your Dart file.

import 'dart:js';

1. Define a function that will invoke your JavaScript function.

void invokeJavaScriptFunction() {
  context.callMethod('yourJavaScriptFunctionName');
}

Note that the context object is provided by dart:js and represents the global JavaScript object.

1. Call the invokeJavaScriptFunction function from your Flutter code as needed.

onPressed: () {
  invokeJavaScriptFunction();
},

Make sure you provide the correct name for the JavaScript function you want to invoke.