Validating fields in WrkTaskIP page

Hi,

I was able to get that working, but I believe it is not correct fully.

when the comments field is not added, and reject button is clicked, I am able to get alert "Please enter comments", but after entering comments and again clicking on Reject, is not processing it.

I have used the below code:

 $(document).ready(function () {

  var buttons = document.getElementsByTagName("input");

        var buttonsCount = buttons.length; 

        for (var i = 0; i <= buttonsCount; i += 1) {

            if (buttons[i].value == "Reject") {

                buttons[i].onclick = function (e) { 

                    var txtarea = document.getElementsByTagName("textarea");

                    var txtareaCount = txtarea.length; 

                    for (var i = 0; i <= txtareaCount; i += 1) {                       

                        if (txtarea[i].title == "Type comments to include with your response.") {

                            if (txtarea[i].value == "") {

                                alert("Please enter Reason");

                                e.preventDefault();

                                return false;

                            }

                            else {

                                return true;

                            }

                        }

                    }

                };

            }

        }

 });

The reject button is having the control defined, when I see F12

<input style="width: 76px; height: 21px; text-align: center;" 
id="ctl00_PlaceHolderMain_XmlFormControl_V1_I1_B7" 
class="w_5jghZOsnCxGdM8MP_0 x_5jghZOsnCxGdM8MP_0 a6_5jghZOsnCxGdM8MP_0 aw_5jghZOsnCxGdM8MP_0"
 onfocus="return (Button.OnFocus(this, event));" 
title="Reject" onclick="return (Button.OnClick(this, event));" 
value="Reject" type="button" OriginalId="V1_I1_B7" 
FormId="ctl00_PlaceHolderMain_XmlFormControl" ViewDataNode="13" 
direction="ltr" wrapped="true" ScriptClass="Button" 
buttonid="Approval_btnReject">

Now my code is also adding a onclick event, so I believe it is not working in the "return true".

I am doing this in a copy of the "WrkTaskIP.aspx", which I have refered as the page in VS 2012 workflow.

How to fix this?

Thanks