get URL page parameters Flutter & Flutterflow

getURLparameters.dart

// Automatic FlutterFlow imports
import '/backend/schema/structs/index.dart';
import '/backend/schema/enums/enums.dart';
import '/actions/actions.dart' as action_blocks;
import '/flutter_flow/flutter_flow_theme.dart';
import '/flutter_flow/flutter_flow_util.dart';
import '/custom_code/actions/index.dart'; // Imports other custom actions
import '/flutter_flow/custom_functions.dart'; // Imports custom functions
import 'package:flutter/material.dart';
// Begin custom action code
// DO NOT REMOVE OR MODIFY THE CODE ABOVE!

import 'dart:html';

Future<String> getUrlParameters(String tag) async {
  // Add your function code here!

  print('html: ${window.location.href}');

  print('parametro: $tag');
  print("Uri.base: ${Uri.base}");
  print("Uri.base.query: ${Uri.base.query}");
  print(jsonEncode(Uri.base.queryParameters));

  String ret = '';

  if (tag.isNotEmpty) {
    ret = Uri.base.queryParameters[tag] ?? '';
  } else {
    ret = Uri.base.query;
  }

  if (ret.isEmpty) {
    String currentURL = window.location.href;
    if (currentURL.contains('?') && currentURL.contains(tag)) {
      // Converte a string de consulta em um Uri para facilitar o acesso aos parâmetros
      Uri uri = Uri.parse(currentURL);
      // Acessa o valor do parâmetro desejado
      ret = uri.queryParameters[tag] ?? '';
    } else {
      ret = currentURL;
    }
  }

  return ret;
}