javascript - ASP.NET OnClientClick="return validate()" not working -


in following aspx page, no matter how call onclientclick="return validate()", page post back. following have tried , results of each attempt:

onclientclick="return true" ----- successful postback

onclientclick="return false" ------ no postback

onclientclick="return validate()" ----- successful bad input

onclientclick="return validate()" ------ successful input

onclientclick="if (!validate()) {return false;}" ----- no postback regardless of input

<!doctype html>  <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <script src="//code.jquery.com/jquery-1.12.0.min.js"></script> <script type="text/javascript">     function validate() {         $('input[type=text]').each(function () {             if ($(this).val() === '' || $(this).val() === 'required field' || $(this).val() === 'username' || $(this).val() === 'password') {                 return false;             } else {                 return true;             }         });     }     $(document).ready(function () {         $('input[type=text]').focusin(function () {             $(this).removeclass('invalid');             $(this).val('');         }),          $('input[type=text]').focusout(function () {               if ($(this).val() === '') {                  $(this).removeclass('valid');                  $(this).addclass('invalid');                  $(this).val('required field');              } else {                  $(this).addclass('valid');              }          });     }); </script> <title></title> <style type="text/css">     .invalid {         border: 2px solid red;         background-color: lightpink;         color: red;     }      .valid {         border: 2px solid green;         background-color: lightgreen;         color: green;     } </style> </head> <body>     <form id="frmlogin" runat="server">         <asp:textbox id="txtuser" runat="server" text="username"></asp:textbox>         <asp:textbox id="txtpassword" runat="server" text="password"></asp:textbox>         <asp:button id="btnsubmit" runat="server" text="login" onclientclick="if (!validate()) {return false;}" onclick="btnsubmit_click" />   </form> </body> </html>

you can try changing button to:

<asp:button id="btnsubmit" runat="server" text="login" onclick="return validate();" />

if doesn't work, use form onsubmit handler, better way go:

<form id="frmlogin" runat="server" onsubmit="return validate();">

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