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“how to add multiple event listener in javascript” Code Answer’s

how to add multiple event listener in javascript

javascript by Motionless Mouse on Jul 10 2020 Donate

// events and args should be of type Array
function addMultipleListeners(element,events,handler,useCapture,args){
  if (!(events instanceof Array)){
    throw 'addMultipleListeners: '+
          'please supply an array of eventstrings '+
          '(like ["click","mouseover"])';
  }
  //create a wrapper to be able to use additional arguments
  var handlerFn = function(e){
    handler.apply(this, args && args instanceof Array ? args : []);
  }
  for (var i=0;i<events.length;i+=1){
    element.addEventListener(events[i],handlerFn,useCapture);
  }
}

function handler(e) {
  // do things
};

// usage
addMultipleListeners(
    document.getElementById('first'),
    ['touchstart','click'],
    handler,
    false);

Source: stackoverflow.com

multiple event with javascript

javascript by Rich Ray on Sep 28 2020 Donate

/* 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";
      }  
    }
}