MVC :: Html.DropDownList Using A List?
Sep 14, 2010
This has to be a simple thing, but for whatever reason, I'm just not finding it.I want to use the HTML Helper function to create a DropDownList based on a List<string> (and actually have it bind to the data field on the model). The simplest example, I suppose, would be:
<%: Html.DropDownList("Material",
new
SelectList(new[][code]....
This creates the items in the drop-down, but of course, there's nothing in this line that would bind it to my model (model.Material). I've done drop-downs with collections of models, where you can bind the Data and Display attributes to properties of the class, but I don't have a class here, just a List.
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Jul 18, 2010
For my ASP.NET page, in the code behind I load various items/options into a DropDownList but I do not set a default by assigning SelectedIndex. I notice for the postback SelectedIndex is set to 0, even if I never set focus to or changed the value in the DropDownList.
If not otherwise specified in the code behind or markup, will a default value of 0 be used for the SelectedIndex in a postback with a DropDownList? If yes, is this part of the HTML standard for selection lists, or is this just the way it is implemented for ASP.NET?
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Jun 8, 2010
I am trying to implement an html definition list in which each <dt> is the <header> in the accordion, and <content> is the <dd>. No matter how I write this out I can't get it to be valid markup because of the position of the <div>s inside the definition list where divs aren't allowed.
I also tried using a unordered list but had the same validation issues. I would really like to use the accordian, but not if I have to sacrifice valid semantic markup on my page.
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Jul 16, 2010
We are facing many challenges in using HTML dropdownlist in MVC web role. We want to get the value of the item selected by user from dropdown and based on that we want to populatee value of another text box. However whenever we tray to do so we always getthe value null b'coz ViewData returns null. In case any one has tried this kind of scenario, then plesae share your complete code - HTML declaration as well as the corresponding Action Result?
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Aug 14, 2010
How to bind Dropdownlist box in mvc through list
i m not able bind fdata in drop dow
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Mar 14, 2011
how to load a DropDownList from a list of strings and then on post back get the selected value.
Here is the code where I am creating the list of strings (years).
[Code]....
I don't know how to get the selected value, plus when I submit my form after selecting the year from the DropDownList I get the following error.
"There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'BYear'."
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Jun 11, 2010
Is it possible to get an object of type <T> as selected value?
I have an object "SearchInput" with a member "Bu" of type "BusinessUnit".
I would like to show a select box so that the user can select one of them.
The following code populates the list in the action method:
[Code]....
In the strongly typed view (with SearchInput as model) the list is displayed like this:
[Code]....
which passes only the selected Id but I would like to use the first option.
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Nov 26, 2010
I have a dropdownlist in a formview that looks like this:
<asp:DropDownList ID="DropDownList5" runat="server" AppendDataBoundItems="True"
DataSourceID="SqlDataSource6" DataTextField="StaffName"
DataValueField="StaffName" SelectedValue='<%# Bind("LetterName") %>'
Width="155px">
<asp:ListItem Value=""> </asp:ListItem>
</asp:DropDownList>
I am trying to add the value from a textbox which is also in the formview into the dropdownlist as a list item. I currently have this code for it:
Protected Sub Formview1_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles FormView1.PreRender
Dim dropdown As DropDownList
Dim listvalue As TextBox
dropdown = FormView1.FindControl("dropdownlist5")
listvalue = FormView1.FindControl("textbox1")
dropdown.Items.Add(New ListItem(listvalue.Text, listvalue.Text))
End Sub
This code works and adds the new item to the dropdownlist if I have no SelectedValue set for my dropdownlist. However when I set the selectedValue I get the error message:
"'DropDownList5' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value"
This is the bit I dont understand because the value does now exist in the list of items as it was added in from the textbox value. Does it try to do the selectedValue before adding my list item? If so how can I add the list item first, or do I need to set the selectedValue in the code after adding the list item?
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Feb 22, 2011
I am trying to bind generic list to DropDownList an i am not sure how to continue.
[Code]....
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Mar 28, 2011
I have more than 50 counties in DropDownList. Instead of entering all the 50 counties into DropDownList, Is there any other way, that give best results.?
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Feb 9, 2010
I want to list all the countries in my dropdown list. where can i get all the names? from service right? How to do this?
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Feb 1, 2011
I have a DropDownList.
I need populate it with item collected in a List<ListItem>.
In my script, collector has been populated properly.
But I cannot populate the DropDownList. I receive an error:
DataBinding: 'System.Web.UI.WebControls.ListItem' does not contain a property with the name 'UserName'."}
<asp:DropDownList ID="uxListUsers" runat="server" DataTextField="UserName"
DataValueField="UserId">
List<ListItem> myListUsersInRoles = new List<ListItem>();
foreach (aspnet_Users myUser in context.aspnet_Users)
{
// Use of navigation Property EntitySet
if (myUser.aspnet_Roles.Any(r => r.RoleName == "CMS-AUTHOR" || r.RoleName == "CMS-EDITOR"))
myListUsersInRoles.Add(new ListItem(myUser.UserName.ToString(), myUser.UserId.ToString()));
}
uxListUsers.DataSource = myListUsersInRoles; // MAYBE PROBLEM HERE????
uxListUsers.DataBind();
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Sep 7, 2010
I have page which has many DropDownLists. I want to access them all with foreach. I had found some codes but they didn't worked for me. Some of them are having page.controls etc.
I have
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI;
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Nov 28, 2010
I am using asp.net 3.5 c#.If i want the application (user) to pick multiple things from a dropdownlist, view them and then insert into database.. how can i do that?Is it possible to make it so that once he picks something from the dropdownlist it is added to a list (or a table) ,, so he can check them before inserting to DB??
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Sep 24, 2010
Basically when editing an item, I want to bind its ProviderId value to the DropDownList's select value.DropDownList is getting its list of values from other entity entity_List as you can see.
Markup:
<asp:ListView ID="aList" runat="server" OnDataBound="aList_OnDataBound" DataKeyNames="ListServID" DataSourceID="ListServCon" InsertItemPosition="LastItem" selectedvalue='<%# Bind("ProviderID") %>' >
[code]...
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Dec 14, 2012
Just wondering if this auto complete for text box to be modify for dropdown list.
Sometime I need value in drop down not shown in text box.
Base on: [URL] .....
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Oct 14, 2010
I'm not sure how to load a dropdownlist for the HTML.DropDrownList.
In controller:
List<SelectListItem> _itemList = new List<SelectListItem>();
SelectListItem _item = new SelectListItem();
_item.Text = "First"; [code]....
Results :my dropdown displays "System.Web.Mvc.SelectListItem" ...where I'm expecting the "First" (the _item.Text).
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Oct 21, 2010
Im using asp.net mvc 2. I have a model Supermodel that consists of 2 models TestModel1 and TestModel2. In SuperModelView Im doing the following thing:
<%: Html.DisplayFor(x=> x.TestModel1, "TestModel1Template") %>
Its working just fine, except for the fact, that dropdownlist is populated but selected value is not set.Im using the following code for a dropdownlist in my template:
<%: Html.DropDownListFor(x=> x.Property1, (IEnumerable<SelectListItem>)ViewData["MyDDLList"], Model.Property1) %>
and its not setting the selected property. I put the code below to SuperModelView, that calls <%: Html.DisplayFor To populate the template and it works just fine.
<%: Html.DropDownListFor(x=> x.TestModel1.Property1, (IEnumerable<SelectListItem>)ViewData["MyDDLList"], Model.TestModel1.Property1) %>
UPDATE: I`ve tried to investigate the issue, but something is totally wrong. I can share the whole code, not sure where to put it, here or attach with separate files.
@Darin, what other parts should I share, or just share the whole model view and controller files?
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Jan 14, 2011
so I have the following html.dropdownlist;
[Code]....
how do I get the value/item selected in my controller?
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Feb 22, 2011
I've been all over the Internet looking for an acceptable solution to this issue, but didn't find one, so hopefully I'll have more luck here. I've got a Html.DropDownList control in my application that pulls in a set of values from the database. That works just fine. However, I want to set the selected value in code, which has never worked correctly. This is, in my opinion, one of the worst implementations of Html helpers in MVC. Here's the culprit:
[Code]....
OK, it takes in a list of statuses and gets the text/value options set without a problem, but doesn't ever render the selected value on the option with a value (ID) of "5". I've stepped through the code as it is assigning these values, and it
does set the value of that option to select = true, but the rendered html doesn't reflect this. I recall something about this helper using the Model to set its selected value, but why will it not allow the value to be explicitly set? Even better, if for some reason explicitly setting this in code isn't going to work, why allow it as viable code, and just silently fail? I'm all for this coding by convention approach MVC has taken, but when the convention is explicitly overridden in code, the code should prevail, I would think.
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Jul 29, 2010
I am building a SharePoint web part that creates a HTML list as below
<ul>
<li> ... </li>
</ul>
Is there a way to enable paging on this list using Javascript because the list is too long?
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Dec 11, 2010
How can I get the selected value of a HTML dropdown list using asp.net 2.0 (VB). I know I have done something like this before, but can't find that code.
Here is my HTML list
<select id="a2"><option>1</option><option>2</option><option>3</option><option>4</option><option>5</option></select>
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Jan 26, 2011
I am trying to get some values from a List and then create a html table with this data but I can't get it to work properly.
I have:
HtmlTable table = new HtmlTable();
HtmlTableRow row;
HtmlTableCell cell;
foreach(var item in Name)
{
row = new HtmlTableRow();
foreach(var familyName in item.familyName)
{
cell = new HtmlTableCell();
cell.InnerText = item.familyName.ToString();
row.Cells.Add(cell);
}
foreach (var givenName in item.givenName)
{
cell = new HtmlTableCell();
cell.InnerText = item.givenName.ToString();
row.Cells.Add(cell);
}
table.Rows.Add(row);
}
this.Controls.Add(table);
When I step through the debugger I can see that row.Cells.Add(cell) contains the family name in the first loop and given name in the second loop but then something seems to be wrong and I can't get the table to show up on the page with this data.
When I check the table.rows.add(row) it says that "base {System.SystemException} = {"'HtmlTableRow' does not support the InnerText property."}"
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Jan 13, 2011
I have a list of Key/Value pairs. basically its a List where ViewModel is a custom class of the form
public class ViewModel
{
public String Key { get; set; }
public String Value { get; set; }
}
In the View i would need to render Label and Textbox for Key and Value respectively.Im trying to use Html.DisplayFor() however it goes with model and only displays the properties of the model and not the list.I would like to achieve something of the format
<% foreach (var item in Model) { %>
<tr>
<td>
<%:Html.Display("item")%> [code]....
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Feb 26, 2010
I've got a class that implements IListSource and returns a generic List of ListItem objects (List<ListItem>). in this list one of the ListItems has the Selected attribute set to true.On the web page I have a standard asp:dropdownlist and I set it's datasource to the getList method of my class and databind it.The problem is that the databind seems to loose the selected Item and the first item in the generic list becomes selected.
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