blockscout/apps/block_scout_web/assets/js/pages/layout.js

import $ from 'jquery'

$(document).click(function (event) {
  var clickover = $(event.target)
  var _opened = $('.navbar-collapse').hasClass('show')
  if (_opened === true && $('.navbar').find(clickover).length < 1) {
    $('.navbar-toggler').click()
  }
})
$(document).ready(function() {
  if (matchMedia) {
    var mq = window.matchMedia("(max-width: 900px)");
    mq.addListener(WidthChange);
    WidthChange(mq);
  }

  function WidthChange(mq) {
    if (mq.matches) {
      $("#checkIfSmall").removeClass("dropdown-menu");
      $(".dropdown-item").removeClass("active");
      $("#checkIfSmall1").removeClass("dropdown-menu");
      $("#checkIfSmall2").removeClass("dropdown-menu");
    } else {
      $("#checkIfSmall").addClass("dropdown-menu");
      $("#checkIfSmall1").addClass("dropdown-menu");
      $("#checkIfSmall2").addClass("dropdown-menu");
    }
  }
});

var div1 = document.getElementById("toggleImage1");
var div2 = document.getElementById("toggleImage2");

function switchVisible() {
  if (!div1) return;
  if (getComputedStyle(div1).display === "inline-block") {
    div1.style.display = "none";
    div2.style.display = "block";
  } else {
    div1.style.display = "inline-block";
    div2.style.display = "none";
  }
}
document
  .getElementById("toggleButton")
  .addEventListener("click", switchVisible);