Question

I have a dropdownlist and have an event selectedIndexChanged which postsback, i want to be able to show a message to the user whenever he changes the value in dropdownlist, based on the input from the message i will decide if i have to postback or not.

The message shown would be are you sure? if he selects yes i would continue with postback, if he says no, i would cancel the postback and assign the previous value as selected.

I have searched alot but cant figure out a solution to this, i think if there is a javascipt function which determines if a postback is required or not that could help i guess

Thanks

Answer 1

// get a reference to the DropDownList
var selectlistId = '<%= ddlYourList.ClientID %>',
    selectlist = document.getElementById(selectlistId);

// attach to the onchange event
selectlist.onchange = function() {

  // decide whether to execute the __doPostBack event, which submits the
  // form back to the server
  if(confirm("Are you sure you want to do this?")){
     __doPostBack(selectlistId, '');
  }
};