How to use more than one event handler for a function?

Question

How do I combine more than one Event Handler,

document.getElementById("prix").onchange = function(e)
{
document.getElementById("hhh").innerHTML = this.value*100;
};
document.getElementById("prix").onkeyup = function(e)
{
document.getElementById("hhh").innerHTML = this.value*100;
};

I know this is horrible if I do this, so how can I combine them?

Answer 1

Just define the function and use it twice

var handler = function (e) { 
  document.getElementById("hhh").innerHTML = this.value*100;
};

document.getElementById("prix").onchange = handler;
document.getElementById("prix").onkeyup = handler;