ASP.NET - Populating The DropDownList DdlItems In The Page_Load Event?
Feb 15, 2010
I am populating the DropDownList ddlItems in the Page_Load event. I am then changing the current selection of the DropDownList in the Page_Load event but the dropdownlistbox.SelectedItems aren't firing up. Can anyone please help me? The dropdownlist keeps on repopulating and I cannot stick with one value that I have selected.Here's a screenshot of the problem.I want to have the value LK00260 selected when I PostBack.Instead of having to see "Add New Item" everytime I postback OVER AN OVER AGAIN.
[code]...
I don't want 'Add New Item' to show up everytime I repopulate the box. Instead, I want a value that I have selected such as 'LK00260'. Can anybody please help? I have AutoPostBack set to true already.
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Apr 15, 2011
I have a dropdownlist named ddlRoomName and a sql table name roomlist, when i run the sql command in sql it works fine.
But when i load the page the rooms do not load am i missing something obvious here?
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Page.IsPostBack Then
ddlRoomName.Items.Clear()
[Code]....
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Nov 9, 2010
how to auto disable asp.net checkbox1 on page_load event ?
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Sep 7, 2011
I have a problem with running code in the right order. What I am trying to do is updating a session state variable when I press a button. When I run my code it always runs the event handler for the button after my page_load function.The reason why I need to run it after page_load is that, thatI add a line to the textList. Which the loadGui() should add to a table. The table has a remove button for all lines so the loadGui() function can not be added later becuase then the event handler of the remove buttons wont work.
User press the add button which add a row in the TempResponse Session(TempResponse) gets updated loadGui() runs and includes the newly added row
Sub Page_Load()
[code].....
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Feb 17, 2010
this is the scenario. I have 1 aspx file with a table in it. it has a .aspx.vb file behind it. i want to populate this table from the .vb code. the table shall have many lines (rows) but they should be in this format. also the checkbox data, textbox data and dropdownlist data comes from database behind. how should i go about this?
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Apr 27, 2009
Im making a site in Visual Studio using vb and I have a variable in page_load but need its value in the event handler of a button for passing on session.
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Sep 15, 2011
I'm fiddling with sessions in asp.net in a http module.The problem:
session("whatever") = "something"
is set on page_load I need an event in the http-module which is executed after page_load, and in which I have access to the session in System.Web.HttpContext.Current.Session I was looking at this HTTPModule Event Execution Order? but I can only get the session in PostAcquireRequestState, which obviously comes before page_load...
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Oct 7, 2011
I have two radio button on my asp.net page, with AutoPostBack = True When I click on either of those, they each set a flag SaveData=False However, when I click on them, the page_load event occurs first, so the page_load event saves the data, then the radiobutton_OnCheckedChanged event is triggered. How can I trigger the OnCheckedChanged before the page_load event?
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Jul 3, 2009
Each time my webpage is loaded it runs a routine in the page_load event of the page behind which increments a viewcount by 1.
The problem I have is that the routine runs even if use refresh to reload the page.
How do I stop this routine from running if the page has been viewed by a particular user in their current session? [code]...
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Jan 17, 2011
I have a page that contains dynamically generated Dropdown List controls and I want thant the dynamic dropdown list perform an AutoPostback to fill some other field using the value selected.[code]Control is correctly filled and rendered on ASP page but, after selecting a value, the page is reloaded (AutoPostBack is called) but the control is not diplayed and the sub is not called. I put a breakpoint into the ChangeValue sub but anything happens.I read on some post that handler for the first DropDownList is not necessary but, how is it possible to tell DropDownList to call my sub after changevalue?
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Sep 7, 2010
Trying to get the findcontrol to work so I can set the default value of the dropdownlist I have in a template field, but I'm having no luck. Am I doing something wrong?
[Code]...
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Feb 25, 2010
Asp.Net 2.0 framewrok - VB.Net application I have a UserControl containing a Asp.Net DropDownList.
Things already researched and or tried:
The control gets bound to data on page load inside if not Page.IsPostBack (only loads once) ID proprety is set for control (ID = ddlMyControl) AutoPostBack is set to true EnableViewState on the control is set to true AutoEventWireUp in the UserControl declaration is set to true EnableEventValidation is set to false in the parent page
The control will not fire it's SelectedIndexChanged event no matter what I do.
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Mar 4, 2009
I have an ASP.NET 2.0 that contains a dropdown list used to filter records based on a group number. For example, if the dropdown list selectedvalue = 3, only records containing a 3 in the group number column of the table will display. This is working perfectly. However, when the page first displays the default value is 1, and the records from group 1 do NOT display unless I trigger the dropdown list event. I am trying to get the records to display for group 1 when the page first opens to avoid having to use the dropdown when the page loads. The "drop down list control" filters records in a "data list" control.
I am thinking of writing a piece of VB.NET code to automatically call the Drop Down List's SelectIndexChanged event on the page so the user does not have to do it. how do I call that event from the "On Page Load" or, is there a better way to do this?
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Dec 7, 2009
I have a page that has two dropdownlists(one for the locations, and the other for departments), an employee search textbox and a button. On the other page, I have a gridview. Now, what i want to archieve is that when a user types an employee's name in the textbox control, selects a location from the location dropdownlist, and a department from the departments dropdownlist, and click the button(search), the gridview on the other page must show the reqiured information of a SINGLE employee. Only one row must show.
I have created a database for the employees. I know how to do this with the autopostback but i have not tried it using a button's click. NB: the gridview should show only one row of a selected employee. I'm using ASP.NET VB
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Apr 6, 2009
PROBLEM OVERVEIW: everything "runs", it never crashes, it populates the checkboxlist on the page, it even calls BindCheckBoxList during the databind but it never checks the boxes.
I have debugged and stepped through the stop points comments are below.
FRONT END CODE:
<asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True" DataSourceID="AccessDataSource2"
DataTextField="Abbreviation" DataValueField="Abbreviation" OnDataBinding="BindCheckBoxList" OnSelectedIndexChanged="BindCheckBoxList">
[Code].....
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Oct 7, 2010
I would like to show different values in a dropdownlist, while editing a gridview, depending on which user is logged in. For example...
The officer would see "Approved by Officer" status.
The director would see "Approved by Director" status
I am trying to add these programatically to a dropdownlist which I have in the edit template of my gridview (approvalsGrid). Here is my code:
Protected Sub ApprovalsGrid_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles ApprovalsGrid.RowUpdating
Dim ApprovalEditDD As DropDownList = CType(ApprovalsGrid.Rows(ApprovalsGrid.EditIndex).FindControl("ApprovalEdit"), DropDownList)
[code]....
I do not get any errors. But get an empty dropdown with no items. Am I using the correct event?
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Feb 3, 2011
Let's say I have a DropDownList of product categories and a ListView of products based on the category selection in the DropDownList. When a user visits the page, there is a possibility of conconrency issue as new product belonging to a new category may be added to the inventory as the user is browsing.When the user selects a different category to view(a SelectedIndexChanged event) and causes a postback, I want the DropDownList to update the list of categories to include the new category being concurrently added and at the same time still able to make a change of selected index.
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Aug 28, 2009
I want to populate the dropdownlist ddVerantwortlich1 with the people with the proper credentials based on the selected process step ddProzesss chritt1.It doesn't work if I want to change it using datasource and databindi have to manually loop through the table in the dataset returned from the query. then it works. but not otherwise.[code]
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May 26, 2011
I have a window having 2 dropdowmlists(schemename-SN and propertyno-PN) , one chkbox ,one "VIEW" button.SN has options "all" with value=0 and many other options with respctive values.Now,i want the code should behaves as follows:
1.0n window onload, SN must b visible bt PN nt.
2.if i select SN other thn All...the PN shud b visible and if i select "All" ,PN hides.
3.when check box is checked- PN hides,and if it is unchecked- PN visible..
Important:-This whole ddl n chk box are in updatable panel,button is nt in that.I want a browser compatible code so javascript can't b used directly(cz they give problem in mozzila and chrome).Right now, i have done this JavaScript and its is working fine.
function window.onload()
{
DisableProperty();
}
[code]....
but this code is not browser compatible.here onload,onkeyup and onclick functions are used , but they dont work in other browsers except internet explorer.
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Jun 1, 2009
I have found a couple of examples on the internet to do this but really struggling to get it working in VB. (Tried a converter but had mixed results) I need the selection options of a Dropdownlist to be populated based upon the differing values in the first dropdown list.
Can anyone help with a releativley simple example in VB? Not fussed if the values are "hard coded" in the script. Or a SQL bit that pulls the data from a table
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Apr 1, 2009
how to override the page_load or any other base page event every time in an application? I keep finding half examples and answers around the web. I want to fire this method every time a page is loaded.
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Jun 18, 2012
I am upgrading a 1.1 web app to 4.0 and am running into an issue with the page_load of a custom user control firing twice, both being treated as non-postbacks (IsPostBack is false in the case). I have read around and it seems that there are 2 culprits to this, 1 being an img tag without something in the src part (which there are no images on this page at all) or 2 an issue with AutoEventWireup and Handles being used at the same time. I have looked through all my code and there are no Handles keywords in there at all and AutoEventWireUp is set to true on every page, yet I still get this issue.
[Code]...
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Jan 19, 2011
have a look at my VB/ASP code and tell me if you can see what's wrong (I highlighted the important segments in red):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<%@Page Explicit="true" Language="VB" Debug="true"
[Code].....
Basically, I'm trying to get the Page_Load subroutine to execute on the page load, but it doesn't seem to be called. I'm assuming that because I set my feedback label to "feedback" in the Page_Load subroutine, I should see it displayed on the page saying "feedback" on first loading the page and every time I refresh. But this doesn't happen. I'm lead to conclude that the Page_Load subroutine is not being called on the page load.
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Jan 19, 2011
VB/ASP code and tell me if you can see what's wrong (I have bolded the important segments):
[Code]...
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Apr 26, 2010
i have 1 master page with 5 pages that call it. now on the master page, I have few dropdowns and textboxes, and the calling pages only have a small article in the corner. I want to start a session on page_load event, so that if the user chooses to select a dropdown or put data in textbox, even if he clicks on the other 4 links of other pages, the data should stay.how can this be done?
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Nov 2, 2011
I am trying to set the class attribute of a list item on page load. Dim liItem As HtmlGenericControl = DirectCast(Page.FindControl("default"),HtmlGenericControl)liItem.Attributes.Add("class", "active")
This code doesn't work, not quite sure why.This is the error it is generating "NullReferenceException: Object reference not set to an instance of an object"
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May 31, 2011
I have a simple ASP.NET page:
sub Page_Load
//Get data form databse and show it
end sub
sud deletsome(Source As Object, e As EventArgs)
//delete one record when user click on submit button
end sub
When I click the button, the page reload, all the data have no change, I must re-enter the page again, the record I have delete disappear. Can you show me why? The full code here:
[Code]...
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Jun 6, 2011
I have created an VB.NET page to record views for ads and will call page from img src.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Dim insert_number As Integer = 0
Dim ad_id As Integer = 0
[Code].....
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Jun 14, 2012
i have a question ( i am learning VB) is there is a way in vb.net to make the Me.LoadComplete loads after the client side , i develop this simple code to make it easy to understand my question
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Handles Me.LoadComplete
MsgBox(myhiddenField.Value)
End Sub
[Code]...
when the page loads , the MsgBox will be empty but when you click the link button the MsgBox has the value you set in the javascript , so i assume that the page_load function gets excuted first
the question is how can i load the client content before the page_load ?
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Jul 1, 2011
I'm just starting out looking at asp.net. I've got this code that works in VB, but not in asp.
I've put this in the page_load:
Dim db_con As SqlConnection, ssql As String, db_cmd As SqlCommand, rdr As SqlDataReader
db_con = New SqlConnection("Data Source=myServer;Initial Catalog=processes;User Id=usrID;Password=mypwd;")
[Code]....
why this wouldn't work in asp.net? The issue is that the label is blank. In vb.net as soon as the form is shown, the lable says "It connected".
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