multiple events single listener javascript code example

Example 1: multiple event with javascript

/* get the button id "tg" which is used for toggling.Then on click few 
elements with classname "adv" will disappear and at the same time few elements 
with classname "btnpro" will increase in width to 80px*. Upon second click  
elements with "adv" will appear again and the button width changes to 60px*/

document.getElementById("tg").onclick = function ()
{
  my_fun1();
  my_fun2();
}

function my_fun1()
{
  var x = document.getElementsByClassName("adv")
    for(var i=0; i<x.length;i++) {
      if (x[i].style.display === "none") {
        x[i].style.display = "block"
        flag = false
      } else {
        x[i].style.display = "none"
        flag = true           
      }      
    }  
}

function my_fun2()
{
  var x = document.getElementsByClassName("btnpro")
    for(var i=0; i<x.length;i++) {
      if(flag){
        x[i].style.width = "80px";
      }else{
        x[i].style.width = "60px";
      }  
    }
}

Example 2: javascript more than one event listener

// Setup our function to run on various events
var someFunction = function (event) {
    // Do something...
};

// Add our event listeners
window.addEventListener('click', someFunction, false);
window.addEventListener('mouseover', someFunction, false);