How to set a value in hidden field according to item selected in drop down list

asp.net, c#, html, javascript

Solution

Yes, you can. You should declare an event handler for the event on drop down list changed value. There in this hanlder you could use this one

HiddenFieldID.Value=ddl.SelectedValue;

When I am saying an event handler, I mean to add in your markup this loc

<asp:DropDownList ID="ddl" runat="server" OnSelectedIndexChanged="ddl_SelectedIndexChanged"/>

and in your code behind class

protected void ddl_SelectedIndexChanged(sender object, EventArgs e)
{
     HiddenFieldID.Value=ddl.SelectedValue;
}

Problem

I have a drop down list which i create dynamically: ``` foreach(XmlNode item in doc.SelectNodes("//Monits/Monit")) { User newuser = new User(); newuser.Id = item.SelectSingleNode("Id").InnerText; newuser.UserName = item.SelectSingleNode("UserName").InnerText; newuser.Email = item.SelectSingleNode("Email").InnerText; usersddl.Items.Add(newuser.UserName); //userddl is a tag on aspx } ``` I want to know if there is a way to keep the user Id in a hidden field according to item changed in my ddl. For example I select from drop down list the name Robbie, and his Id will be held in hidden field value attribute. I dont have more code to show because i dont know where to start... Help some one?

Original source