Cancel Postback from javascript RSS

• • Reply
  

  mahens

  Member

  43 Points

  118 Posts

  Cancel Postback from javascript

  Feb 24, 2007 01:47 PM|LINK

  Hi,

  iam having checkboxlist.it is set to autopostback.

   

  intially im showing checkboxlist with everything(Checkbox in chkboxlist) selected. Now im writing Javascript code so tht Minimum One shud be select.

   

  For example : if 3 checkbox  in chkboxlist are selected intially.whenver user deselects each checkbox postback occurs.

  If user deselects all checkboxed I shud display javascript alert message saying Atleast One shud be selected. I cud able to get aleert message .but i cudnot stop Postback .

  Can any1 tell me how to stop postback from javascript ...

   

  With regards,

  m,ahender 

• • Reply
  

  Haissam

  All-Star

  37421 Points

  5632 Posts

  Re: Cancel Postback from javascript

  Feb 24, 2007 09:24 PM|LINK

  consider you have the below javascript function

  function checkselected()

  {

  if(your condition)

  {

  alert('Please select one');

  return false;

  }

  }

  now add the below code in the page_load event

  CheckBoxList1.Attributes.Add("OnSelectedIndexChanged","return checkselected();");

  the return false in the javascript function will stop the postback and you call your function in code behind using the return keyword

  HC

  Haissam Abdul Malak
  MCAD.NET
  | Blog |
• • Reply
  

  mahens

  Member

  43 Points

  118 Posts

  Re: Cancel Postback from javascript

  Feb 26, 2007 03:39 AM|LINK

  Hi,

  Dude,Its Not wrking can u tell me Another procedure.Possibly tht Event is not there for Checkboxlist in javascript .