How to execute a user defined JavaScript function using executeScript method of Selenium Java web driver

Question

This is my code so far to execute function using Selenium:

JavascriptExecutor js=(JavascriptExecutor) driver;    
script="startDialog('arg1','arg2');";    
js.executeScript(script);    

Javascript function to be executed:

$(document).ready(function() {    
    var Btn = document.getElementById("btnid");  
    Btn.onclick = function() {  
    startDialog("arg1", "arg2");  
   };  
});

Unable to execute startDialog function using executeScript function of Selenium Java web driver.

Answer 1

Where is startDialog defined? The function you refer to isnt named and only calls startDialog.

Ofter the exception is correct. The function you are trying to call is undefined.

Answer 2

The script has to be the exact java script, not a function name. Try to assign the body of the function for script variable and then executing it. Like this -

script="$(document).ready(function() {" +     
"var Btn = document.getElementById('btnid');"+  
"Btn.onclick = function() {" +
"startDialog('arg1', 'arg2');};});"