asp.net - Change associated textbox color with jquery on client validation -

i want use jquery select associated element's parent required , change css class.

i need add css class "error" parent div of span required field. (this color textbox according css).

i have following html markup gets generated aspx page:

<div class="control-group">   <label>your name</label>   <input name="ctl00$maincontent$txtname" type="text" maxlength="100" id="maincontent_txtname">   <span data-val-controltovalidate="maincontent_txtname" data-val-errormessage="your name required" data-val-display="dynamic" id="maincontent_txtnamerequired" class="error" data-val="true" data-val-evaluationfunction="requiredfieldvalidatorevaluateisvalid" data-val-initialvalue="" style="display:none;">this field required</span> </div> 

after "client validation" span gets changed to:

<span data-val-controltovalidate="maincontent_txtname" data-val-errormessage="your name required" data-val-display="dynamic" id="maincontent_txtnamerequired" class="error" data-val="true" data-val-evaluationfunction="requiredfieldvalidatorevaluateisvalid" data-val-initialvalue="" style="display: inline;">this field required</span> 

and after server postback span actually:

<span data-val-controltovalidate="maincontent_txtname" data-val-errormessage="your name required" data-val-display="dynamic" data-val-isvalid="false" id="maincontent_txtnamerequired" class="error" data-val="true" data-val-evaluationfunction="requiredfieldvalidatorevaluateisvalid" data-val-initialvalue="">this field required</span> 

i use 1 javascript function not require onclick function on each button used. want reuse same function on many pages.

while couldn't find answer based on how based on span , data elements, instead hour or later found question helped me come solution:

<script type="text/javascript">     $(document).ready(function () {         $("form").submit(function () {             if (typeof page_validators != 'undefined') {                 var errors = '';                 $.each(page_validators, function () {                     if (!this.isvalid) {                         $(this).parent().addclass("error");                     }                 });             }         });     }); </script> 

link: validation event asp net client side validation