CODEWITHSUNDEEP
asp.netdrop-down-menu
aleafonso
aleafonso

Reputation: 2256

Dropdown-check-list for asp.net gets duplicated in every postback

I am using the dropdown-check-list plug-in to create a dropdownlist that allows multiple selection.

However, it is getting duplicated in every postback after it has been used, which produces something like this:

enter image description here

Does anyone know why this is happening and how to fix it?

UPDATE: About the request to show some code:

Javascript:

$(document).ready(function () {
    Sys.WebForms.PageRequestManager.getInstance().add_endRequest(load_lazyload);
    load_lazyload();
    ...
}

function load_lazyload() {
    $("#ContentPlaceHolder1_userControl1_listBoxMultiValueNumbers").dropdownchecklist();
    ...
}

C#: this is how the listBox is being populated:

listBoxMultiValueNumbers.DataTextField = ds.Tables[0].Columns["number"].Caption;
listBoxMultiValueNumbers.DataValueField = ds.Tables[0].Columns["number"].Caption;
listBoxMultiValueNumbers.DataSource = ds;
listBoxMultiValueNumbers.DataBind();
listBoxMultiValueNumbers.Items.Insert(0, new ListItem("Select numbers", "-1"));
UpdatePanelUCCNFT.Update();

Upvotes: 0

Views: 1654

Answers (3)

CDspace
CDspace

Reputation: 2689

You're calling the load function twice, thus getting two drop downs. Once registered with ...add_endRequest(load_lazyload) and again explicitly. I'd guess if you remove the call to add_endRequest it would fix it (after all, you already have it wrapped in $(document).ready())

Upvotes: 0

scc
scc

Reputation: 385

I don't if you still have the problem or not. I just encountered similar problem where I had, dropdownlist gets duplicating after every postback. This solved my problem 

fillDropDownList()
{
 String selectValue = DropDownList.SelectedValue();
 DropDownList.Items.Clear(); // to clear the duplicates
 DropDownList.SelectedValue = selectValue; // to restore previously selected value
 DropDownList.Items.Insert("0", New ListItem(" Select ", ""));
 DropDownList.DataBind();
}

in the page_load

if (Page.IsPostBack)
  {
   fillDropDownList();
  }

I hope this helps!

Upvotes: 0

user1102001
user1102001

Reputation: 707

i think you have load your dropdown on page load without using postback event..that's why its binding everytime..

use page_load()
{
  if(!ispostback)
  {
     //load your dropdown here
  }    
}

Upvotes: 1

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