CODEWITHSUNDEEP
javascript
user3540018
user3540018

Reputation: 11

Javascript (no Jquery): How do I call a function on click?

After looking through all the JS docs out there, I just can't figure out why this isn't working: I've got a button with the ID of "next", and all I wanna do is trigger the function whenever the user clicks on that button.

    var nextBtn = document.getElementById("next");

    var nextSlide = function (a,b){
        return a + b;
    }

    nextBtn.onclick = nextSlide(4,5);

So when the user clicks on the button, I can see the "9" in the console.

Upvotes: 0

Views: 79

Answers (4)

Jesuraja
Jesuraja

Reputation: 3844

Use this:

nextBtn.onclick = function() { nextSlide(4,5); }

Upvotes: 0

Shashank
Shashank

Reputation: 829

Use

window.onload=function(){
var nextSlide = function (){
                 this.add=function(a,b){
                        console.log(a+b);
                     return a+b;
                  };
                 };
var nextBtn= document.getElementById('btn');
 //nextBtn.attachEvent('onclick', new nextSlide().add(4,5)); //With versions less than IE9
 nextBtn.addEventListener('click',new nextSlide().add(4,5), false); //IE9 and above
 };

Upvotes: 0

Mritunjay
Mritunjay

Reputation: 25882

You can say like this

var nextSlide = function (a, b){
  return function(){
     return a+b;
  }
}
var nextBtn = document.getElementById("next");
nextBtn.onclick = nextSlide(4,5);    // so basically the clicking on button will call the function being returned by function nextSlide.

Upvotes: 0

mcn
mcn

Reputation: 721

You can use an anonymous function expression like this:

HTML

<button id="next">next button</button>

Javascript

var nextBtn = document.getElementById("next");

var nextSlide = function (a,b){
    console.log(a + b); // for display purpose only
    return a + b;
}

nextBtn.onclick = function(){
  nextSlide(4,5);
}

PLAYGROUND

Upvotes: 1

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