<a class="button is-primary is-large modal-button" data-target="modal-bis">Launch image modal</a>

<div id="modal-bis" class="modal">
  <div class="modal-background"></div>
  <div class="modal-content">
    <p class="image is-4by3">
      <img src="https://bulma.io/images/placeholders/1280x960.png">
    </p>
  </div>
  <button class="modal-close is-large" aria-label="close"></button>
</div>

import (
      . "github.com/siongui/godom"
)

func main() {
      Document.AddEventListener("DOMContentLoaded", func(e Event) {

              // Modals

              rootEl := Document.Get("documentElement")
              modals := Document.QuerySelectorAll(".modal")
              modalButtons := Document.QuerySelectorAll(".modal-button")
              modalCloses := Document.QuerySelectorAll(".modal-background, .modal-close, .modal-card-head .delete, .modal-card-foot .button")

              closeModals := func() {
                      rootEl.Get("classList").Call("remove", "is-clipped")
                      for _, modal := range modals {
                              modal.ClassList().Remove("is-active")
                      }
              }

              if len(modalButtons) > 0 {
                      for _, modalButton := range modalButtons {
                              modalButton.AddEventListener("click", func(e Event) {
                                      targetId := modalButton.Dataset().Get("target").String()
                                      target := Document.GetElementById(targetId)
                                      rootEl.Get("classList").Call("add", "is-clipped")
                                      target.ClassList().Add("is-active")
                              })
                      }
              }

              if len(modalCloses) > 0 {
                      for _, modalClose := range modalCloses {
                              modalClose.AddEventListener("click", func(e Event) {
                                      closeModals()
                              })
                      }
              }

              // Close modals if ESC pressed
              Document.AddEventListener("keydown", func(e Event) {
                      if e.KeyCode() == 27 {
                              closeModals()
                      }
              })
      })
}

'use strict';

document.addEventListener('DOMContentLoaded', function () {

  // Modals

  var rootEl = document.documentElement;
  var $modals = getAll('.modal');
  var $modalButtons = getAll('.modal-button');
  var $modalCloses = getAll('.modal-background, .modal-close, .modal-card-head .delete, .modal-card-foot .button');

  if ($modalButtons.length > 0) {
    $modalButtons.forEach(function ($el) {
      $el.addEventListener('click', function () {
        var target = $el.dataset.target;
        var $target = document.getElementById(target);
        rootEl.classList.add('is-clipped');
        $target.classList.add('is-active');
      });
    });
  }

  if ($modalCloses.length > 0) {
    $modalCloses.forEach(function ($el) {
      $el.addEventListener('click', function () {
        closeModals();
      });
    });
  }

  document.addEventListener('keydown', function (event) {
    var e = event || window.event;
    if (e.keyCode === 27) {
      closeModals();
    }
  });

  function closeModals() {
    rootEl.classList.remove('is-clipped');
    $modals.forEach(function ($el) {
      $el.classList.remove('is-active');
    });
  }

  // Functions

  function getAll(selector) {
    return Array.prototype.slice.call(document.querySelectorAll(selector), 0);
  }

});