Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

How to access elements inserted into htmlselect through javascript on code behind

Posted on 2004-04-21
6
Medium Priority
?
521 Views
Last Modified: 2013-11-19
Hi All,

I have inserted elements into htmlselect server control through javascript. I wanted to access those elements inserted from code behind. I could access the control, but not the elements inserted , It always returns 0 as the list count.

Following is my code

<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb" Inherits="WebApplication1.WebForm1"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
      <HEAD>
            <title>HtmlselectAutoPostBack.aspx</title>
            <script language="javascript">
            function bodyload(){
               with(document.Form1){
                  sel.length = 0
                  sel[sel.length] = new Option("Red",1)
                  sel[sel.length] = new Option("Green",2)
                  sel[sel.length] = new Option("Blue",3)
               }
            }
            </script>
      </HEAD>
      <body onload="bodyload();">
            <form id="Form1" method="post" Runat="Server">
                  
                  
                  <select id="sel" name="sel" runat="server" size="3" multiple>
                  </select>
                  <br>
                  <br>
                  <asp:button id="btn" Runat="server" Text="test"></asp:button>
                  <br>
            </form>
      </body>
</HTML>


code behind:

 Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here
         For i As Integer = 0 To sel.Items.Count - 1
            If sel.Items(i).Selected Then
                Response.Write(sel.Items(i).Value & " : " & sel.Items(i).Text & " <br>")
            End If
        Next
 End Sub

Earlier reply would help
Thanks in advance

0
Comment
Question by:JRevathi
  • 3
  • 2
6 Comments
 
LVL 5

Accepted Solution

by:
chaniewskim earned 400 total points
ID: 10886159
Sorry, impossible.
You could find some workaround: for example use hidden field and write there information about js-inserted entries, for example:

1,Option 1;2,Option2...

Then you could parse that string on server-side and recreate options on server-side or use that information in other way.
But only this way. SELECT doesn't post it's entries to server on postback.
0
 
LVL 28

Expert Comment

by:mmarinov
ID: 10886217
Hi JRevathi,

Sorry for the answer, but you can not get the items add to the select control through javascript
reason:
because of the client script in your code behind .net doesn't know that there is some change in this control and when you submit the page you lose all added items

if you want to check what is the value/text of the selected item in the htmlselect you can add a hidden field with runat="server" write a javascript function that fill thie sield onchange of the htmlselect but thats all

B..M
0
 
LVL 5

Expert Comment

by:chaniewskim
ID: 10886234
mmarinov
hello again :)
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 

Author Comment

by:JRevathi
ID: 10886268
Thank you for both of u.
0
 
LVL 28

Expert Comment

by:mmarinov
ID: 10886279
hi chaniewskim,

when i post here there was anything here :-)
0
 
LVL 5

Expert Comment

by:chaniewskim
ID: 10886299
I know I know
I had the same with you a few times
so I say 'hi' :)
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I found this questions asking how to do this in many different forums, so I will describe here how to implement a solution using PHP and AJAX. The logical flow for the problem should be: Write an event handler for the first drop down box to get …
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
The viewer will receive an overview of the basics of CSS showing inline styles. In the head tags set up your style tags: (CODE) Reference the nav tag and set your properties.: (CODE) Set the reference for the UL element and styles for it to ensu…
The viewer will learn the benefit of using external CSS files and the relationship between class and ID selectors. Create your external css file by saving it as style.css then set up your style tags: (CODE) Reference the nav tag and set your prop…
Suggested Courses

571 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question