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.NET Forum / ASP.NET / General / February 2006dropdownlist multiple selection problem
hi, after binding the dropdownlist to a datasource, ive experience this error "Cannot have multiple items selected in a dropdownlist" after using the code: dropdownlist.items.findbyvalue("value").selected = true I didnt specify any selected item in the dropdownlist during binding to the datasource. I use dropdownlist.clearselection() but still error occurs. I need information on this. Thanks. Ads Can we see your complete code? I'm not familiar with ClearSelection (don't see it in the docs right now for some reason??) Karl  Signaturehttp://www.openmymind.net/ > hi, > after binding the dropdownlist to a datasource, ive experience this error [quoted text clipped - 8 lines] > > Ads //build the datasource of the 2 dropdownlists on page load if(!ispostback) { for (int i = DateTime.Now.Year; i > DateTime.Now.Year - 50; i--) { ListItem li = new ListItem(i.ToString(), i.ToString()); ddlYrJoined.Items.Add(li); ddlYrLeft.Items.Add(li); } ddlYrLeft.Items.Insert(0, "SELECT"); ddlYrJoined.Items.Insert(0,"SELECT"); } //on a separate function ddlYrJoined.Items.FindByValue(dr["yrstart"].ToString()).Selected = true; //where dr["yrstart"].ToString() is a datareader getting its values from a database > Can we see your complete code? I'm not familiar with ClearSelection (don't > see it in the docs right now for some reason??) [quoted text clipped - 12 lines] > > > > Ads Is the separate function also called when !ispostback? You had also mentioned ClearSelection() but I don't see that anywhere.. KArl Signaturehttp://www.openmymind.net/ > //build the datasource of the 2 dropdownlists on page load > [quoted text clipped - 36 lines] >> > >> > Ads yes.the separate function is called when !ispostback too. Heres the complete code: if (!IsPostBack) { if (Request.QueryString["id"]!= null) { BindDDL(); LoadSelectedAffiliation(int.Parse(Request.QueryString["id"].ToString())); } } private void LoadSelectedAffiliation(int id) { SqlDataReader dr = Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteReader(System.Configuration.ConfigurationSettings.AppSettings["connectionstring"], CommandType.Text, "select * from jbaffiliates where affiliateid=" + id); ddlYrJoined.ClearSelection(); ddlYrLeft.ClearSelection(); while (dr.Read()) { orgname.Text = dr["orgname"].ToString(); orgloc.Text = dr["orglocation"].ToString(); ddlYrJoined.Items.FindByValue(dr["yrstart"].ToString()).Selected = true; ddlYrLeft.Items.FindByValue(dr["yrend"].ToString()).Selected = true; position.Text = dr["highestpositiontitle"].ToString(); responsibilities.Text = dr["responsibilities"].ToString(); } dr.Close(); } private void BindDDL() { for (int i = DateTime.Now.Year; i > DateTime.Now.Year - 50; i--) { ListItem li = new ListItem(i.ToString(), i.ToString()); ddlYrJoined.Items.Add(li); ddlYrLeft.Items.Add(li); } ddlYrLeft.Items.Insert(0, "SELECT"); ddlYrJoined.Items.Insert(0,"SELECT"); } > Is the separate function also called when !ispostback? You had also > mentioned ClearSelection() but I don't see that anywhere.. [quoted text clipped - 41 lines] > >> > > >> > Ads well that clears that up. I didn't think you were setting multiple values. You can't do that in a dropdownbox, use a listbox instead. Karl Signaturehttp://www.openmymind.net/ > yes.the separate function is called when !ispostback too. Heres the > complete [quoted text clipped - 96 lines] >> >> > >> >> > Ads Hmmm...can u please elaborate your statement? I do receive the error message "Cannot have multiple items selected in a dropdownlist." Why cant i use the code for dropdownlist if its provided there? > well that clears that up. I didn't think you were setting multiple values. > You can't do that in a dropdownbox, use a listbox instead. [quoted text clipped - 101 lines] > >> >> > > >> >> > Ads Well, you are trying to have multiple values selected. The DropDownList simply doesn't allow this to happen. To be able to have multiple values selected, you need to use a ListBox instead of a DropDownBox. Karl Signaturehttp://www.openmymind.net/ > Hmmm...can u please elaborate your statement? I do receive the error > message [quoted text clipped - 113 lines] >> >> >> > >> >> >> > Ads In the first function BindDDL() im just binding the datasource to the dropdownlists and in the second function,im trying to select an item for each dropdownlist. Please take note that there are 2 dropdownlist in my code (ddlYrJoined and ddlYrLeft). Im a bit confuse. I know its not allowed to have multiple selection in a dropdownlist. Which part of the code am i trying to select multiple values? > Well, you are trying to have multiple values selected. The DropDownList > simply doesn't allow this to happen. To be able to have multiple values [quoted text clipped - 119 lines] > >> >> >> > > >> >> >> > Ads while (dr.Read()) { orgname.Text = dr["orgname"].ToString(); orgloc.Text = dr["orglocation"].ToString(); ddlYrJoined.Items.FindByValue(dr["yrstart"].ToString()).Selected = true; ddlYrLeft.Items.FindByValue(dr["yrend"].ToString()).Selected = true; position.Text = dr["highestpositiontitle"].ToString(); responsibilities.Text = dr["responsibilities"].ToString(); } if your data reader contains more than 1 record, u'll be looping through it and trying to assign a different dr["ystart"] and dr["yrend"] to each dropdown Karl Signaturehttp://www.openmymind.net/ > In the first function BindDDL() im just binding the datasource to the > dropdownlists and in the second function,im trying to select an item for [quoted text clipped - 137 lines] >> >> >> >> > >> >> >> >> > Ads Though im assuming there's only 1 record, i'll check if theres more record. Better if i remove the while loop. Thanks Karl > while (dr.Read()) > { [quoted text clipped - 152 lines] > >> >> >> >> > > >> >> >> >> > Ads Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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