What is wrong with this javascript?

Question

i use this javascript syntax for validating a checkbox...

 alert(document.getElementById("ctl00_ContentPlaceHolder1_Chkreg").checked);
  if (document.getElementById("ctl00_ContentPlaceHolder1_Chkreg").checked == false) {
        document.getElementById("ctl00_ContentPlaceHolder1_ErrorMsg").innerHTML = "please select the checkbox";
        document.getElementById("ctl00_ContentPlaceHolder1_Chkreg").focus();
        return false;
    }

My alert showed me false but my if loop is not working... Any suggestion...

Answer 1

Assuming your box isn't checked, I would personally write it like:

var box = document.getElementById("ctl00_ContentPlaceHolder1_Chkreg");
if (!box.checked) {
    document.getElementById("ctl00_ContentPlaceHolder1_ErrorMsg").innerHTML = "please select the checkbox";
    box.focus();
    return false;
}