SharePoint dropdown behaviour

Question

I've created aspx page in Sharepoint, In it I placed the asp.net dropdown control (drpitems) and I bind the some values to the control. In the aspx page I've another control called button. In run time I've selected some value in dropdown control and rise the button control.
In button control I do the following.

button event
{
ListItem item= drpitems.SelectedItem;

}

the problems is whatever dropdown items i chosen and raise the event the drop down selectded item contain always dropdown first item's value. but normal asp.net web application behave what I expected.

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By Sarathi

Answer 1

Hi,

At what stage are you binding the items to the dropdown control? It seems that before your button click event is getting a chance to get fired, the drop down is being re-bound causing it to lose its selecteditem.

Regards

Nauzad Kapadia.

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Answer 2

hi Nauzad,

The values bind at page onload event which is one time binded that also at page newly loaded not post back.

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By Sarathi

Answer 3

Hi Sarathi,

In your onload event, bind the DropDown control only if its not post back.

Add the bellow code and check if it works

if(!Page.IsPostBack)

{

//Code to bind drop down control

}

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Ram Prasad Meenavalli | MCTS SharePoint 2010 | MCPD SharePoint 2010

Answer 4

Hi

You need to check in your page OnLoad event whether the page is getting loaded for the first time or getting loaded because of a postback. Even if a page is posted back, the onLoad event of the page will still fire.

Use the IsPostBack property of the page to perform this check.

Regards

Nauzad Kapadia

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Answer 5

I've used the above technique always. eventhought I couldn't get the selected item properly. I'm intermediate level programmer in ASP.NET I never ask simple question in froum first of all.

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By Sarathi

Answer 6

Hi Sarathi,

Then you need to post your complete source code to allow someone to identify the problem. 

Regards,

Nauzad Kapadia.

P.S. There is no fixed definition for what constitutes a simple or difficult question. Solutions are provided to you on the basis of past experience and assumptions of what you COULD have done wrong. 

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Answer 7

Hi Ram,

I always work like what you said. I got the drop down first item always in my button post back event. what is mistake here.

I've dropdown list ( id drplistitem) and in page load method I bind the data like as below

page load

if(!Page.IsPostBack)
{
LoadDropListItems();

}



private void LoadDropListItems()
{
SPWeb web = SPContext.Current.Web;
            string listname = "listname";
            SPList lst = web.Lists.TryGetList(listname);

            if (listname != null)
            {

                List<ListfieldDef> flds = new List<ListfieldDef>();
                foreach (SPField fld in lst.Fields)
                {
                    if (fld.CanBeDeleted && !fld.Hidden)
                        flds.Add(new ListfieldDef() { FieldDataType = fld.TypeAsString, FieldFullName = fld.Title });

                }

                drplistitem.DataSource = flds;
                drplistitem.DataTextField = "FieldName";
                drplistitem.DataValueField = "FieldType";
                drplistitem.DataBind();

}

button_event
{
ListItem itm= drplistitem.SelectedItem; //item always first items of dropdown list.
}

public class FieldDetails
{
  public string FieldName{get;set;}
  public string FieldType{get;set;}
}

               

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If you get your question answered, please come back and mark the reply as an answer.
If you are helped by an answer to someone else's question, please mark it as helpful.

By Sarathi