MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

/* Spoiler buttons */

var spoilersc = document.getElementsByClassName('spoilerButton');
    var j;

for (j = 0; j < spoilersc.length; j++) {
  spoilersc[j].addEventListener("click", function() {
    this.classList.toggle("active");
    var spoilercontent = this.nextElementSibling;
    if (spoilercontent.style.display === "block") {
      spoilercontent.style.display = "none";
    } else {
      spoilercontent.style.display = "block";
    }
  });
}

/* Dropdown menus */

function selectVariant(id) {  
var dropdown = document.getElementByClassName(id); 
document.getElementById("variant").value = dropdown.options[dropdown.selectedIndex].text;  
}