get custom attribute of listBox items

Question

0.00/5 (No votes)

See more:

hi guys

i have problems in getting custom attribute of list box items

i have select quarry that select rows and save in DataTable Named "dt"

i add all of items in list box and set custom attribute "type"

C#

foreach (DataRow ro in dt2.Rows)
            {
                li = new ListItem();
                li.Value = ro["fileOuId"].ToString();
                li.Text = ro["EsTittleF"].ToString();
                li.Attributes.Add("type", "Essay");
                ListBox1.Items.Add(li);
            }

i want to get type attribute on list box select item change

C#

 protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
       

       

        string type = "";
        type=ListBox1.SelectedItem.Attributes["type"];

        
        if (type=="Book" )
             // Book
        if (type=="Essay")
             //essay
}

the problem is : "string type" is null in item change ,,, i can see type in each item in execute mode;

HTML

<option type="Essay" value="242">Esssssssssssssssssay test </option>

Posted 19-May-14 2:28am

farham_heidari

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

SRS(The Coder) · Accepted Answer · 2014-05-19T03:07:00

Actually this is a common issue documented on various sites and forums. When adding ListItems dynamically and setting attributes that the attribute tags are not retained during postback.

We need to derive a control from the base of ListBox and implement the methods to render it properly.Here is an article that describes how to do this and covers this issue(for dropdownlist).

Please Click here....

The article covers the DropdownBox but the ListItem class is the same class for dropdownlists as it is for the listbox control.

Hope this will definitely of help for you.