当用户单击表单按钮时显示模式，当用户单击codeigniter中的模式按钮时提交表单

<button id="showModalBtn">显示模态框</button>

<!-- 模态框 -->
<div id="myModal" class="modal">
  <div class="modal-content">
    <span class="close">&times;</span>
    <form id="myForm" action="<?php echo base_url('controller/submit_form'); ?>" method="post">
      <!-- 表单内容 -->
    </form>
  </div>
</div>

// 当用户单击表单按钮时显示模态框
document.getElementById("showModalBtn").addEventListener("click", function() {
  var modal = document.getElementById("myModal");
  modal.style.display = "block";
});

// 当用户单击模态框中的关闭按钮时隐藏模态框
document.getElementsByClassName("close")[0].addEventListener("click", function() {
  var modal = document.getElementById("myModal");
  modal.style.display = "none";
});

// 当用户单击模态框中的模态框按钮时提交表单
document.getElementById("modalSubmitBtn").addEventListener("click", function() {
  var form = document.getElementById("myForm");
  form.submit();
});

class Controller extends CI_Controller {
  public function submit_form() {
    // 处理表单提交的数据
  }
}