Add onclick event programmatically

Question

How do I add an onclick event to a tag in HTML programmatically?

I want to be able to click a link, and have an onclick event attached to a Javascript function take effect on another tag.

Here is what I have so far:

var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount); 
var cell1 = row.insertCell(0); 
var element1 = document.createElement("input");
element1.type = "text";
element1.id="List["+num+"].id";
element1.name="List["+num+"].id";
element1.onclick="javascript:CalCal()";
cell1.appendChild(element1);

I want to call a Javascript function CalCal() on onClick event. Is this possible?

Answer 1

But keep in mind that addEventListener is supported in IE just from version 9. To support older versions of IE you could use something like that:

if (element1.addEventListener) {  // all browsers except IE before version 9
  element1.addEventListener("click", CalCal, false);
} else {
  if (element1.attachEvent) {   // IE before version 9
    element1.attachEvent("click", CalCal);
  }
}

Answer 2

Yes you can add an onclick event programmatically in javascript like this:

element1 = document.getElementById("your_tag_id");
element1.addEventListener("click", CalCal)

This attaches an onClick event to tags with id="your_tag_id".

You can also remove the onclick event like this:

element1.removeAttribute("click");

More at https://developer.mozilla.org/en-US/docs/DOM/element.addEventListener