Hi,
I am programming a classical registration form using asp.net.
I have the country list and a list of all states for each country in a
database.
I already have this working code in which if the user selects a country
I populate a list with the states/provinces for that country, the
dropdown for the countries is set to autopostback.
protected void Page_Load(objec t sender, EventArgs e)
{
Location loc = new Location();
if (!IsPostBack)
{
SqlDataReader dr = (SqlDataReader) loc.GetCountryL ist();
lbxCountries.Da taSource = dr;
lbxCountries.Da taTextField = "CTRY_NAME" ;
lbxCountries.Da taValueField = "CTRY_CODE" ;
lbxCountries.Da taBind();
}
SqlDataReader drst = (SqlDataReader) loc.GetStateLis t
(lbxCountries.S electedItem.Val ue);
lbxState.DataSo urce = drst;
lbxState.DataTe xtField = "STAT_NAME" ;
lbxState.DataVa lueField = "STAT_CODE" ;
lbxState.DataBi nd();
}
However, when there's a problem in the form, for example, a missing
field, and I show the registration form again the state list is reset
to the first item in the list, i.e. it losses the position it has prior
to the attemp of registration.
So, how should I program this in order to kept the current item of the
lbxState between postbacks ? 3 1867
<cr************ @hotmail.com> wrote in message
news:11******** **************@ c13g2000cwb.goo glegroups.com.. . Hi,
I am programming a classical registration form using asp.net. I have the country list and a list of all states for each country in a database.
I already have this working code in which if the user selects a country I populate a list with the states/provinces for that country, the dropdown for the countries is set to autopostback.
protected void Page_Load(objec t sender, EventArgs e) { Location loc = new Location();
if (!IsPostBack) { SqlDataReader dr = (SqlDataReader) loc.GetCountryL ist(); lbxCountries.Da taSource = dr; lbxCountries.Da taTextField = "CTRY_NAME" ; lbxCountries.Da taValueField = "CTRY_CODE" ; lbxCountries.Da taBind();
SqlDataReader drst = (SqlDataReader) loc.GetStateLis t
(lbxCountries.S electedItem.Val ue);
lbxState.DataSo urce = drst;
lbxState.DataTe xtField = "STAT_NAME" ;
lbxState.DataVa lueField = "STAT_CODE" ;
lbxState.DataBi nd();
}
You don't want to call DataBind on PostBack. Instead, get the state list for
the country only when the country changes, in the SelectedIndexCh anged event
for lbxCountries.
John Saunders
"John Saunders" wrote: <cr************ @hotmail.com> wrote in message news:11******** **************@ c13g2000cwb.goo glegroups.com.. . Hi,
I am programming a classical registration form using asp.net. I have the country list and a list of all states for each country in a database.
I already have this working code in which if the user selects a country I populate a list with the states/provinces for that country, the dropdown for the countries is set to autopostback.
protected void Page_Load(objec t sender, EventArgs e) { Location loc = new Location();
if (!IsPostBack) { SqlDataReader dr = (SqlDataReader) loc.GetCountryL ist(); lbxCountries.Da taSource = dr; lbxCountries.Da taTextField = "CTRY_NAME" ; lbxCountries.Da taValueField = "CTRY_CODE" ; lbxCountries.Da taBind();
SqlDataReader drst = (SqlDataReader) loc.GetStateLis t (lbxCountries.S electedItem.Val ue); lbxState.DataSo urce = drst; lbxState.DataTe xtField = "STAT_NAME" ; lbxState.DataVa lueField = "STAT_CODE" ; lbxState.DataBi nd();
}
You don't want to call DataBind on PostBack. Instead, get the state list for the country only when the country changes, in the SelectedIndexCh anged event for lbxCountries.
John Saunders
Since you are binding your select box on each request, you are overriding
the viewstate maintained by ASP.NET. And hence everytime you get fresh data
in your select box.
As pointed by John, tt is not required to bind data with every request. You
can implement SelectedIndexCh anged event and put the binding logic there. So,
the select box can maintain its viewstate on other postbacks.
Cheers,
Rahul Anand
John & Rahul :
Thanks a lot, that's made the work ! This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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