Web Forms :: Logic Behing Counting Dropdownlist Items?
Aug 12, 2010
I have a bounded dropdownlist. there may be many items in dropdownlist, i dont know how manty they will be depending on some conditions.suppose there are N items are bounded in this dropdownlist let say
A
B
C
D
E
.
.
.
.
.
N
and I am also doing that if i select A and click add button then it'll be added in a gridview, then i selectB and click add button the B will be added to the gridview.. and so on.I want make it restricted like if i again select A and click add button then it should not be added to the grid view and show msgs thatA is already in the gridview. and if I delete A from gridview that and select A again and click add button the A should be add to the gridview.just let me know the logic with explanation.
I am dealing with a problem that i have to make decision based on the number of items in a cascading dropdownlist. unfortunately this ajax toolkit control does not expose a Items collection.how do i count the number of items in this control ?
I'm developing an E-Commerce, website and within my CART webform a have one Quantity texbox for each product. When a customer insert a number inside of it and click on a update Button, it fires a function and the Product Quantity is updated. It is currently working fine.
But I want to fires the same function and update the quantity without the click button event. When the MOUSE OUT the TextBox, I want to update the quantity automatically.Is there any way to do that?
I was wondering if setting a default value for a SelectList is considered to be presentation logic or business logic? For example, if a requirement is that an Employee cannot be saved without a Location, but 99% of the time the location that would be selected is a particular item -- say Atlanta. Because of this, the location SelectList should be defaulted to Atlanta when ever a entry screen for a new employee is displayed. Should I be defaulting the location in the model or in the view-model? One thing I realized is that the unit tests become awkward because in both cases, I'd be forced to test against a location that will always be present in production but I cannot create a unit test with my own test dataunless "Atlanta" was in the set of locations being used in the test.
i have a database table with lot of records > 17000what is the most efficient way to let user to choose between one of the records- 1 dropdownlist with all the 17000 record ?- 1 textbox with autocomplete and a webservice that return the list of the records ?
I would like to highlight (bold) and disable certain items in the dropdownlist for selection.
My dropdownlist is fed from a SQL table of countries e.g.
Europe -UK -FR -DE -AU
I need to heading "Europe" to be not selectable? the database has a column (selectable = 0) for those heading and I need to make them not selectable on the client side.
I see that dropdownlist has an "items" property to get the list of displayed items for a dropdown, but it doesn't seem to have an equivalent property for getting the "values" associated with the items. For example, I may have a dropdown that displays "High", "Medium" and "Low", but returns values of "H", "M", "L". How can I easily get that list of HML?
I have two DropDownLists; DropDownListStart displays the hours 09:00 - 19:00 and DropDownListStop displays 10:00 - 20:00. When the user chooses one of the hours in DropDownListStart I want the program to adjust what's shown in DropDownListStop so that the first hour shown is one hour after the hour chosen in DropDownListStart. How can I do that in code behind (c#)? An example: if the user choses 13:00 in DropDownListStart I want DropDownListStop to display only 14:00, 15:00, 16:00, 17:00, 18:00, 19:00, 20:00.
when I delete all records from the table it display this error messageon the line ddlIdOCRQ.DataBind()"Argument Out Range Exception was unhandled by user code""'ddlIdOCRQ' has a SelectedIndex which is invalid because it does not exist in the list of items.
System.Web.HttpException: Cannot have multiple items selected in a DropDownList. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Web.HttpException: Cannot have multiple items selected in a DropDownList.
I have a nested gridview and inisde a child grid there are several columns having dropdown and one add button. when add button is click a new row inside a child grid is created with an empty dataand previous row data have been saved in viewstate so that it can be bind wen add button is click to create new rows.My code is working fine when i dont select any dropdown list item and new row is also created but wen i select items from dropdown and click on add more button i get above error.
When add button is click
protected void ButtonAdd_Click(object sender, EventArgs e) { Button gv = ((sender) as Button); string[] ParentIdArray = gv.ClientID.ToString().Split('_'); int ParentId = int.Parse(ParentIdArray[1].ToString().Replace("ctl", "").Trim()) - 2; int RecordCount = ((GridView)GVMain.Rows[ParentId].FindControl("grdAddHotel")).Rows.Count;
DataTable dtAddHotel = new DataTable(); dtAddHotel.Columns.Add("CostSheetId");
I have a DropDownList with a list of orders. When an order is selected from the list I generate a GridView with details of that order. Within the GridView I call other databound controls and all works fine until I finish the orders in the DropDownList
I have tried to enclose the code within a if dropdownlist.items isnot nothing end if but it makes no difference
This is the code:
Protected Sub GridView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles GridView1.DataBound If DropDownList1.Items IsNot Nothing Then GridView1.SelectedIndex = 0 [code]...
I am using C# ASP .NET 2.0. I have a web form with two DropDownList controls. In my code behind I get data from a DataSet. One column is a string (Month), and another is an integer (StatusID). I am setting the selected item in the each DDL in the code behind by doing this:
[Code]....
I have a button with a Click event. What I want to do in the click event is be able to check if the currently selected item in each DDL (if the end-user changed the selection) is different from what was selected in the above code.