[javascript] adding onclick event to dynamically added button?

I am adding a button dynamically in html like below: On click of that button I want to call a Javascript function:

var but = document.createElement("button");

but.value="delete row";

but.setAttribute("onclick","callJavascriptFunction()");
//this is not working

but.onclick="callJavascriptFunction()"
//this is also not working

document.getElementById("but").onclick="callJavascriptFunction()"
//this is also not working

but.id="but"+inc;

Are there any ways to resolve this??Plz help me., thanks in advance

but.onclick = function() { yourjavascriptfunction();};

or

but.onclick = function() { functionwithparam(param);};

This code work good to me and look more simple. Necessary to call a function with specific parameter.

var btn = document.createElement("BUTTON");  //<button> element
var t = document.createTextNode("MyButton"); // Create a text node
btn.appendChild(t);   

btn.onclick = function(){myFunction(myparameter)};  
document.getElementById("myView").appendChild(btn);//to show on myView

Try this:

var inputTag = document.createElement("div");              
inputTag.innerHTML = "<input type = 'button' value = 'oooh' onClick = 'your_function_name()'>";    
document.body.appendChild(inputTag);

This creates a button inside a DIV which works perfectly!

Try
but.addEventListener('click', yourFunction) Note the absence of parantheses () after the function name. This is because you are assigning the function, not calling it.

Remove the () from your expressions that are not working will get the desired results you need.

but.setAttribute("onclick",callJavascriptFunction);
but.onclick= callJavascriptFunction;
document.getElementById("but").onclick=callJavascriptFunction;

I was having a similar issue but none of these fixes worked. The problem was that my button was not yet on the page. The fix for this ended up being going from this:

//Bad code.
var btn = document.createElement('button');
btn.onClick = function() {  console.log("hey");  }

to this:

//Working Code.  I don't like it, but it works. 
var btn = document.createElement('button');
var wrapper = document.createElement('div');
wrapper.appendChild(btn);

document.body.appendChild(wrapper);
var buttons = wrapper.getElementsByTagName("BUTTON");
buttons[0].onclick = function(){  console.log("hey");  }

I have no clue at all why this works. Adding the button to the page and referring to it any other way did not work.

but.onclick = callJavascriptFunction;

no double quotes no parentheses.