Web Forms :: Force User To Select First DropDownList Before Selecting Second
Mar 2, 2014
I have 2 Dropdown(say "DD1", "DD2") and 1 Listbox(say "LB") in my web form,value of the 3 controls depend on each other.
"LB1" is dependent on "DD2" value, "DD2" is dependent on "DD1" value.
I want that if user selects "LB1" without selecting "DD2", it should give a message that "please select DD2 first"similarly if user Selects "DD2" without selecting "DD1", it should give a msg that "Please select DD1 first" ,using ASP.NET C.
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Similar Messages:
Aug 10, 2010
I have (or so I think!) a simple problem.
I will greatly simplify my model to speed this along.
I have a model class lets call it item:
public class Item
{
[Required(ErrorMessage="Must indicate if product is to be tracked by serial number.")]
public bool TrackedBySerial { get; set; }
}
I have an "Add" view where I create a DropDownList like so:
<%= Html.DropDownListFor(model=>model.TrackedBySerial, new SelectList(new List<object> {null,true,false},null),"Select One") %>
<%= Html.ValidationMessageFor(model => model.TrackedBySerial) %>
My problem is that unless I create my boolean value in the model to be a nullable type, I can't force the blank default value.
If I use the Html.DropDownList() instead of DropDownListFor() , is there any way for me to use ModelState.IsValid -- or do I need to mix my own custom validation in my controller as well?
Update: So I got the functionality I was looking for, its just a bit more verbose than I'd have liked. Is there a better way to do this?
Controller:
[HttpPost]
public ActionResult Add(InventoryItem newItem)
{
try
{
//get the selected form value
string formVal = Request.Form["TrackBySerial"];
//convert to true, false, or null
bool? selectedValue = TryParseNullable.TryParseNullableBool(formVal);
//if there is no value, add an error
if (!selectedValue.HasValue).....
view:
<div class="editor-field">
<%=Html.DropDownList("TrackBySerial","- Select One- ") %>
<%=Html.ValidationMessage("TrackBySerial") %>
<%= Html.ValidationMessageFor(model => model.TrackedBySerial) %>
</div>
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Nov 13, 2010
Does anyone ever try to force the user to select the value from autocomplete?
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Jul 28, 2010
I have to select checkboxes besed on group column values. If you see below gridview, column 3 (GroupNo) has 1,1,1,1,2,2,2,2....etc (this column data is not static, will change based on page index. i.e PageIndex =2 may starts with 7,7,7,8,8,8,8,8,9,9,9 etc).
In every sectio/Group User must and should select minimun 2 check boxes. so If user select only one check box we need to show a pop up message as " select One more check box in that particular section" If User skips the message and move to next section we have to show the same message. We have to force the user to select more than one checkbox in the same section.
Mainly our intention is the check boxes whatever user selected in each section/Group belongs to one Category.
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Aug 6, 2010
How can I make a validation if user dont select data from the combobox after selecting a button then error will be on label.text?
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Jan 25, 2010
I want to use a dropdownlist control so that a user can select a value. My problem is, the text value can be very large. Is there any way to make the text to appear on more than one line? Or is there any AJAX or jquery solutions? I can use a gridview with a checkbox but my client really wants a dropdownlist.
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Jul 14, 2010
I'm building a pretty simple application where a user can enter/modify/delete data from a table. Right now, the only field is month, which I'm storing as an integer (1-12). The actual table has more fields but I'm simplifying for the purposes of this question.I have the entry part. For modifying, I've set up a gridview with an 'Edit' button:
[Code]....
The code is putting the gridview row into edit mode. Now, I want to show a dropdownlist of months so the user can select the new month. Also, I would like the dropdownlist to default to the value in the database. I can't figure out how to bind months to the dropdown list ddlMonth.
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Apr 8, 2010
After trying many solutions listed on the internet I am very confused now. I have a C#/SQL web application for which I am simply trying to bind an ExecuteReader command to a Dropdownlist so the user can select a value. This is a VS2008 project on an XP OS.
How it works is after the user selects a table, I use this selection as an input parameter to a method from my Datamatch.aspx.cs file. Then this Datamatch.aspx.cs file calls a method from my ADONET.cs class file. Finally this method executes a SQL procedure to return the list of columns from that table. (These are all tables in Adventureworks DB). I know that this method returns successfully the list of columns if I execute this SP in SSMS. However, I'm not sure how to tell if it works in VS or not.This should be simple. How can I do this? Here is some of my code. The T-sQL stored proc:
CREATE PROCEDURE [dbo].[getColumnNames]
@TableName VarChar(50) AS
BEGIN
SET NOCOUNT ON;
[code]...
The CreateLabels method above correctly shows me the labels. But the CreateDropDownLists method just shows me one dropdownlist with nothing in it. In other words, it is not selectable. So how can I verify that the datareader is returning all 4 columns and inspect their values? I was able to find from datareader "COLUMN_NAME" but I don't know what properties to search to verify the column names.
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Apr 7, 2010
I can't get my radio button list to select a desired value. What am I doing wrong?
Dictionary<int, string> rbl_list = new Dictionary<int, string>();
rbl_list.Add(1, "Home");
rbl_list.Add(2, "Tables");
rbl_list.Add(3, "Graph/Export");[code]....
I'm using c# and the above is written in the Page_Load event.
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Oct 11, 2012
if user login first time in application in how i promot for change password in Asp.Net C#.
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Aug 16, 2010
when i select a row in my gridview the cursor is going to top after selecting the row.
After selecting the row my page is paostbacking so it is going to top.so is there any command in grid to focus the cursor to recnetly selected row.
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Jan 6, 2013
I have some textbox and Dropdownlist in my page and bind it from database
BindDropDownList(DDL3, "Guidcenter", "Centername","id");
DDL3.Items.Insert(0, new ListItem(" please select ", "0"));
I have button in my page that when user click on it insert data into database
Here when users didn't select Item from dropdownlist it insert "please select" ( text that I define for DDL ) into database but I want when users didn't select Item from database it insert NULL in database....
protected void ImageButton2_Click1(object sender, ImageClickEventArgs e) {
string data = Server.UrlDecode(Request.QueryString["BehCode"]);
SqlCommand _cmd = new SqlCommand("insertinfo", _cn);
_cmd.CommandType = CommandType.StoredProcedure;
_cn.Open();
[Code] ......
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Aug 13, 2010
I have a dropdownlist that controls what the users see in the gridview. I want to be able to have the users select "All" as an option. For example the drop down would for years would show: All, 2010, 2009, 2008. How do I code for the user selecting "All"? I am using ASP.NET 3.5 and C#
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Oct 11, 2010
The intension is to get the all text file names in the drop down present in a particular location. When a user selects any filename from the drop down, it will show the data which is in that particular text file in a GridView.
I've done both the steps and it's almost complete but i stuck on a small issue. Probably because of non-usage of ASP.NET for a long period of time. The problem is, the drop down only selects the default value not other values.Here's my code for DropDown Selected Index Change
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
DirectoryInfo di = new DirectoryInfo(@"C:myLogs");
[code]....
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Dec 6, 2010
.aspx code looks like:
[Code]....
Now i have to create a textboxes dynamically in the same page as i select the Options value from drop down list...
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Jan 2, 2011
In my project requirement user wants to enter a manual entry if they can not find an item in the drop down list.
Right now what I am doing is:
I set the dropdown list autopost back true and on selectedchanged event I am hiding the drop down list and showing a text box to enter a manual entry...
This is working perfect and no problems..
but the drop down list needs to change to a text box on only selecting a "unknown" option in the list...all other list items are doing unnecessary post back to the server with no use...
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Mar 25, 2011
I had use a combox to let user select staff name and then it will automatically retrive the responsible recommending officer and approving officer to display in other 2 dropdownlist.
my code works fine but when user select staff name each time, the page will reload once to refresh the dropdownlist.
user complaint and don't want the page reload every time, how can i disable the postback? I need to use ajax?
[Code]....
[Code]....
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Aug 27, 2010
I have an ASP.NET data bound dropdownlist which is populated based on the contents of a textbox. After it is populated I would like to expand the dropdownlist automatically, so that the user realizes that a choice needs to be made and doesn't need to click on the dropdown to expand it. There doesn't seem to be a property or method do do this.
EDIT: After trying out Ed B's example, I am still stuck. The id of my ddl is 'ctl00_ContentPlaceHolder9_ddlContact'. If I put the following in the onclick event of a button, it works fine, the dropdown expands nicely:
document.getElementById('ctl00_ContentPlaceHolder9_ddlContact').size=10;
However, the following code in the Databound event of the ddl shows the alert but doesn't expand the dropdown:
string script = "<SCRIPT LANGUAGE='JavaScript'> ";
script += "alert('expanding');document.getElementById('ctl00_ContentPlaceHolder9_ddlContact').size=10 </SCRIPT>";
ClientScript.RegisterClientScriptBlock(GetType(), "Dropdown", script);
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Jan 14, 2014
I used Membership provider in my application. when i am creating new user by filling the details and adding role after the submit button it force the current user to logout and re-login using the current user which I created.
Like as a admin I created the user irshad, it admin to logout and again re-logged in with the current user irshad.
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Jun 23, 2010
Have a GridView with a templated select button hidden and using
e.Row.Attributes.Add("onclick",Page.ClientScript.GetPostBackEventReference(this.grdMaster, "Select$" + e.Row.RowIndex.ToString())); to select a row .
When user like to update the datasource he will select one row from gridview then in selected indexchanged event i would display the selected row values beneath the form under the grid , Then user will update the contents displayed from grid and click an update button which is outside the grid . After updating the displayed row , i got to get the values of the next row in the grid and display them for next updation , i'e if users maually selects row 3 from grid then he can update the values using the update button and then on update click itself i'll have to display next row contents of row 4 and this process could go on .
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Mar 2, 2011
Can any one let me know about the below issue. I have a page which has three labels, say startdate,enddate and username. My issue is if the user doesnot select any of the above three then a message gets displayed as "Please select one search criteria" or if the user doesnot enter the date in correct format then i dispaly "Please enter date in mm/dd/yy" format. But what is happening is first time if the user doesnot select any then "Please select one search criteria" is getting displayed and after this message gets displayed if the user enters wrong format of date then both the messages are displayed.
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Feb 1, 2010
I have a dropdownlist that I already have manually databinding. I currently get the data, loop through each item, and depending on values in the item, change the css for the individual ListItem.
For example:
foreach (Site mySite in myList)
{
ListItem li = new ListItem(mySite.FullAddress, mySite.Id.ToString());
if (mySite.DisabledFlg)
{
li.Attributes.Add("style", "color:#999");
}
this.Items.Add(li);
}
I'm trying to force the text in the listitem to break at certain points. The string that I retrieve from the datasource currently has a " " everywhere where there should be a line break. This works fine for display in a normal textbox, but it doesn't work on the listitem. I've tried replacing the " " with a "<br>" but when I do that, it just displays <br> in the listem along with the rest of the text. I've tried wrapping the listitem contents in a "div" with a width attribute, but it also just display the "div" tag literally in the ListItem text. I've also tried adding the following to the ListItem attributes at bind:
li.Attributes.Add("width", "100px");
But that hasn't resulted in any change either.
I've seen custom drop down list controls that have multiline listitems in them.
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May 7, 2010
I would like to select some columns from a Datatable, I mean, something like Select Name, Surname, ID,
I'm trying to do something like this:
DataTable dtExcel = new DataTable();
DataRow[] buena = dtExcel.Select("NAME");
in order to get only a view or table with one column (NAME).
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Aug 7, 2013
Can I have a example for Selecting GridView Row by clicking anywhere on the row without select command and also mouse over and mouse out background color change.
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Sep 16, 2010
I have created a web application and generated local resources. Its working when user select language from browser. But what i want is, when user select language from dropdown list, i want to change the pages according to selected language. i can save user selected language in a session. then how should I change/assign local resource file to web page?
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