Asp.net - Refreshing DropdownList Data, After A New Item Has Been Selected
May 10, 2011
I have two dropdownlist, one is State and one is City. When a State is selected, the City dropdownlist becomes populated. At that point you can select a city, however if you select a city and go back and select a different state, the city dropdownlist is populated by the cities for both states. How do I get it clear the cities for the first state?
Here is the code behind
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
I would like to set the selected item in the combo box. It is working, If the dropdownstyle is dropdownlist. But not working, If the dropdownstyle is dropdown. How to make it work when the style is dropdown?
I have an application to display the records of the customers. I am using the wizard to do the edit and delete of the records. In one of my column consists of dropdownlist. When I wanted to edit the changes by selecting the dropdownlist, it didn't display anything after I selected the changes. I have to make changes because my friend did not finish up this part which selecting the selected item to make the editing of the records.
I have to hidden buttons on my page that I can trigger using JavaScript (__dopostback...). I also have a list of object on my page and a dropdownlist giving the user the possibility to sort those objects on the page. My code checks the current value of the dropdownlist on Databind of the list and applies the chosen sort method to the list. The first button is triggered when the user has selected another sort method from the list.
The second button is triggered when the user adds a new item to the list. Sortmethod "sort2" should be set automatically in the dropdownlist if this happens. So when the second button has been clicked, I need to set the selected item of the dropdownlist dynamically so I can check the value of the selected value later in the DataBind method of the dropdownlist and know what sort method should be applied.
I don't succeed in changing the selected value dynamically. I'm using to controls: First is the objects.vb and the second is the ObjectContainer.vb. Objects.vb contains the two buttons, the dropdownlist and an instance of the objectcontainer. The objectcontainer contains the list with objects that needs to be sorted based on the value selected in the objects control.
Objects.vb: Private sortMethod As DropdownList Private container as ObjectContainer Protected Overrides Sub OnInit(ByVal e As System.EventArgs) MyBase.OnInit(e) EnsureChildControls() End Sub [Code] .....
I have a bit of a tricky scenario. It consists of some partial problems for which I have individually found solutions, but I couldn't find anything that makes it all work together smoothly.
-Upon selecting an item in a datagrid, a new page loads with the details regarding that entity. -The entity represents a product that can have any amount of variants (such as a t-shirt's color or size) -I dynamically add dropdownlists to this detail-page that represent these variants (there can be any amount of variants, and each variant can have any amount of different values, each value or combination or values from different variants representing a unique product entity) -Upon selecting a different variant in a dropdown, a delegate is called that will change the session variable to the productId associated with the selected variant and a postback is fired that will reload the page with new data based on this productId
The problem: the postback is fired BEFORE the dropdownlist's (OnSelectedIndexChanged) delegate is called. Since this delegate defines the productId in the session, the new to-be-used productId isn't known at the time of postback.
Result: loading the correct data in the page is always delayed by one postback. Each time I change the selected index of any of the dropdowns, the page is loaded with data based on the session variable that the PREVIOUS OnSelectedIndexChanged delegate of the dropdown set.
I have a LoadData() method that sets the values of all textboxes, fields, labels etc. based on the productId stored in the current session. This method is called on Page_Load. Private Property CurrentProduct As Product Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load LoadData() [Code] .....
It seems that I haven't been completely clear on what does and doesn't apply to this scenario regarding Page Lifecycle.
1) My dropdownlists are added dynamically, which works fine on the first page_load. 2) The content of the dropdownlists is defined by what entity's details i'm loading on the page. 3) What entity's details I'm loading on the page is at first(not-postback) defined by the product I selected in a gridview in the previous page. 4) At postback, this entity is based on a sessionvariable containing the id of the entity. 5) This session variable is defined by what item in the dropdownlist I select. 6) This dropdownlist dissapears after postback since it's not defined on the page, but dynamically. So is the event.
So my guess would go towards some clientside script that stored the selected value before postback, but then I would be clueless on how to get that variable to the server since the logic that retrieves the entity is in the business logic layer which is far away from this page..
View model base has an ObservableCollection of tabs type ViewModelBase. The Tab Control itself is binding fine to these, displaying appropriate view models. I have 2 problems however, I want a "NotepadView" (Of type viewmodelbase) to be replicated numerous times (one view many view models).
At the minute, I have 4 views (NotePadViewModelx where x is 1-4) with corresponding viewmodels, this is because each view had the same text per tab. Now I have individual views per tab.
When I type into tab 1 and switch to tab 2, I lose what I typed in tab one when I click back.
I used a class MyList and with the Help of this MyList the combo box named cboCity was filled with City Code(like 1001,1002,etc..) as Value member and City Name (like Canada,California etc...) as display member.
Public Class MyList Private _dispName As String Private _valMember As Integer Public Sub New()
[code].....
The value members 1001,1002,1003,1004 get inserted as per cbocity(combo box)display name selection , into the database and during the retrieval of the record the value member is obtained and based on that for eg:when i get 1001 the selected item should be Canada.I tried many ways while fetching the record and set the selected item but all fails .
In my application I have a listbox and SelectionMode should be MultiSimple because users need to see which items they selected. In another tab we have another listbox this one should show all the selection users had done in first tab. Private Sub
I have a DropDownList that pulls values from a table in sql server. I want the dropdownlist to populate the list of values based on a selection by the user but also display the contents of the rest of my table in case they need to change something. For ex:
ddl1 has values of: 1, 2, 3, 4, 5 user selects 5, so the value displayed in ddl2 is five, but if you exand the ddl2 you will also see the values of one, two, three, four...
This is the code in my load event...
If Not IsPostBack Then result = dal.dbConnect(DAL.dbType.SqlServer, ConfigurationManager.AppSetting("SQLServerConnection"))
I am trying to split the selected value of an dropdownlist into an array for updating and I don't know what to do here.
Here is my code: Protected Sub Submit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Dim FirstName As TextBox = CType(UpdateJob.FindControl("FirstName"), TextBox) Dim LastName As TextBox = CType(UpdateJob.FindControl("LastName"), TextBox) Dim Address1 As TextBox = CType(UpdateJob.FindControl("Address1"), TextBox) Dim Address2 As TextBox = CType(UpdateJob.FindControl("Address2"), TextBox) [Code] .....
I am using ASP.NET with VB.NET as background code. I have 8 ImageMaps in my webform Estimator.aspx.Each ImageMap represents a car part (Front Bumper, Rear Bumper, Mirror, Hood, Sunroof, DoorShell, Headlights, Tail lights) and I have a dropdownlist ddlChosenParts. When the user clicks on any of the 8 ImageMaps, I add the PostBackValue to the dropdownlist ddlChosenParts.The problem is that if the user clicks on the same ImageMap twice, the PostBackValue is added twice.I want to check if ddlChosenParts contains the ImageMap's PostBackValue and if it already contains it, do not add it again. That means that if the user clicks more than once on the same ImageMap, it's PostBackValue is only added once in ddlChosenParts.I have this code but i'm getting an error: Value of Type String cannot be converted to ListItem. [code]
I have created a dropdownlist which I choose wizard way to fill data in it. and its property like: DataTextField=Item DataValueField=ItemCode
I go to properties of this dropdownlist and then I add Items property as the following: Enabled=true Selected=false Text=---choose--- Value=-1
And the code behind is that: dim strItem as string= ddlItem.selectedItems.text if ddlItem.selectedItems.text.trim="---choose---" then Label1. text=" You haven't choosen any items yet!" exit sub else Label1. text=" You have choose" end if
But when I start debugging this: strItem always gets "---choose---" text eventhough I choosed other items.
This is my code and i am getting an error ..Cannot have multiple items selected in a DropDownList. when the page loads it select "ALL" in DDLModality but when i change DDLModality.selectedvalue to any "value" then no error but again when i change to "ALL "getting the error.
onchange of DDLMODALITY submit the form form1.target = ""; form1.action = ""; form1.submit();
I want to make my dropdownlist selected first value "--select--" when first load page as i need to force user to choose an event from list. I am blur since I need to perform other function at page_load to check checkbox enable properties, so that I not sure where should I put the coding to Add empty value to dropdownlist.
I did put the following code in page load but nothing happen, the "-select- also no appear in the dropdownlist.
Using VS.NET 7.1, VB.NET 2003 , SQL SERVER 2005 EXPRESS, ASP.NET 1.1Is there anyway to make an item in my dropdownlist unselectable, I am databinding to a table and setting the items up like this, so the is something to use if it is possible:[code]
I'm working on a webpage automation project. And I am very new in this. I want to use Webbrowser control to select an item in the dropdownlist. Now,how do I programmatically select an item from the HTML snippet below. I would like to select, say for example, "2009" from this
HTML code: <select name = "yr"> <option value= "">Year</option> <option>2009</option> <option>2010</option> <option>2011</option> <option>2012</option> </select>
I am trying the following code : For Each element As HtmlElement In WebBrowser1.Document.GetElementsByTagName("select") If element.GetAttribute("name") = "yr" Then element.SetAttribute("value", "2011") End If Next
I'm having some difficulty with a sorted & grouped listbox in WPF vb.net 3.5 that has an items source bound to an ObservableCollection.
What I want to be able to do is to retrieve a piece of data from the ObservableCollection items source depending on what item in the listbox the user has selected.I've almost got it working but because the listbox is sorted it does not match the index of the items source.
[code]...
As I previously mentioned, because the lstBox is sorted and also grouped the index's don't match up.Does anyone know how I can get the correct information I want from the List Source depending on the selected item in the list box?
I have a repeater with a dropdownlist in it. When a user changes its index, I would like a label to change its value. (the ddlSizes values come from a MySQL DB)
I have a autocomplete dropdownlist(ddl) in my app. When ever I click on the ddl and start typing to find the item I am looking for in the ddl. The ddl is expanded to show all the orders when typing. After I press the enter key to go out and get the order information for that order the Order number in the ddl is missing but here is the weird part. When I don't have the ddl expanded but still have focus on the ddl. When I find the order I need and press enter. The order number is showing in the ddl as the selected one after it has loaded up the order information.
I have a combo box with "yes" and "no" with i select Yes i want the label2 to change the text to "yes" likewise with "no"
I've tried to code it in a logical way as possible but it just doesn't works except for the "wtf" so i think that overall my code is correct but the way i want to retrieve the selected item from combo box is wrong.
Public Class Form1 Dim aa As String Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
Ok, so I have a listview on one form, and when a button is pressed it opens up a new form with the contents of the selected listview item and it's subitems in a series of textboxes. The user can then change the data in the textboxes and either press save to make the changes or cancel to close the window. What command would I use to change the selected listview item and subitems to whatever is in the boxes?
this is the code that populates the boxes:
Private Sub Form_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim appeditcontents As String = main.passlist.SelectedItems(0).ToString
i have a combobox containing countries name and their codes like INDIA:CNT001 then i have a textbox that store the code of country i.e CNT001(fetching from database) Now i want to match that code with the combobox code so that the combobox is set to that item when i click a button. i m using vb.net and sql server as database.
So here is the deal. I am making my own program for fun, and I have this road block. Basically I have a 'Parent Form' which we'll call 'frmMain' and I also have another form which we'll call 'frmSchedule' (work with me here)
I have an asp drowndownlist and I'd like to change its selection after a button click. I can't seem to find a way to do this, is there a way? (Its a reset button of sorts, and I would like the dropdownlist to return to the "default" value.)
I am making a password program that remembers what the password is for and what the password is. I have two listboxes: 'listbox1' for what the password is for, and 'listbox2' for the password. I also have a remove button. I would like it so when you press the remove button, the selected item in listbox1 is removed and the password in listbox2 is also deleted. The passwords are stored in two settings: what, and pw. The items that will be deleted will have the same value. By value i mean they will be the same number item. E.G. the 1st item, or the 3rd item in the list.
I am trying to use datasource and bind in my application to set a dropdown list to the results of a query. The dropdownlist populates correctly (shows each different type_name in the set) but later when I use ddltype.selectedvalue - I am always getting the value from the first item in the dataset. Here is the code.
I am new to programming and i am working on a windows fom app. In this moment i have my windows form set with several controls that insert data into sql db. Now, what i need is this:
When the user select a employee name from my dropdownlist, i want the form automatically fill with the data inserted in the past to the tables db. Is like choosing the different profiles by selecting the name in the dropdownlist. I have many controls to fill, name, secondname, lastname, telmobil, address, etc.
