input: def generate_html_form():
      """
      This function generates a basic HTML form using JavaScript to submit a user's city and submit the details to the server.
      
      :return: HTML and JavaScript code as a string
      """
      
      html_form = """
  <form id="myForm" onsubmit="submitForm(event)">
    City:<br>
    <input type="text" name="city"><br>
    <input type="submit">
  </form>
  
  <script>
  function submitForm(event) {
    event.preventDefault();
  
    const form = document.getElementById('myForm');
    const city = form.querySelector('input[name="city"]').value;
  
    const data = { city: city };
  
    const options = {
      method: 'POST',
      body: JSON.stringify(data),
      headers: {
        'Content-Type': 'application/json'
      }
    };
  
    fetch('/my-api/submit-form', options)
      .then(response => response.json())
      .then(data => {
        console.log(data);
      });
  }
  </script>
      """
      
      return html_form
  
  # Example usage:
  ## print(generate_html_form())
  ## Output:
  ## <form id="myForm" onsubmit="submitForm(event)">
  ##   City:<br>
  ##   <input type="text" name="city"><br>
  ##   <input type="submit">
  ## </form>
  ## 
  ## <script>
  ## function submitForm(event) {
  ##   event.preventDefault();
  ## 
  ##   const form = document.getElementById('myForm');
  ##   const city = form.querySelector('input[name="city"]').value;
  ## 
  ##   const data = { city: city };
  ## 
  ##   const options = {
  ##     method: 'POST',
  ##     body: JSON.stringify(data),
  ##     headers: {
  ##       'Content-Type': 'application/json'
  ##     }
  ##   };
  ## 
  ##   fetch('/my-api/submit-form', options)
  ##     .then(response => response.json())
  ##     .then(data => {
  ##       console.log(data);
  ##     });
  ## }
  ## </script>
output:     return html_form