I am trying to determine if a list box has any text in it. I tried using a custom validator and the code below always has a result of 0 or false either when there is text or no text in the list box? How can I properly determine if there is text in a list box?
Protected Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CustomValidator1.ServerValidate
args.IsValid = Listbox.Items.Count > 0
End Sub
Private Sub PopulateListBox()
If NameTextBox.Text = "" Then
Else
' Get value from text box
Dim textBoxValue As String = Me.NameTextBox.Text
' Create new item to add to list box
Dim newItem As New ListItem(textBoxValue)
' Add item to list box and set selected index
Listbox.Items.Add(newItem)
Listbox.SelectedIndex = Listbox.Items.Count - 1
End If
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If IsPostBack Then
' Put call here to populate the listbox results from autocomplete extender selection
PopulateListBox()
End If
End Sub
By chance, is this:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If IsPostBack Then
' Put call here to populate the listbox results from autocomplete extender selection
PopulateListBox()
End If
End Sub
Is the IF statement supposed to be instead:
If Not IsPostBack Then
You currently have it not binding the first time, but everytime after.
Related
i want to display text box value to another text box from one webpage to another in a button click.
i know the windows code But don't know the web application.
public qus as form = new question()
qus.txtname=txtname.text
On first page add button click event
Sub Btn_Click(sender As Object, _
e As EventArgs)
Response.Redirect("SecondPage.aspx?id=" + txtname.text, false)
End Sub
on second page set your text on page load.
Private Sub Page_Load(sender As Object, e As EventArgs)
If Not IsPostBack
SecondPageTextBox.Text = Request.QueryString("textValue").ToString()
End If
End Sub
Use the query string to pass the text value to other page in the button click handler, like this:
Protected Sub Button1_Click(sender As Object, e As EventArgs)
Response.Redirect("OtherPage.aspx?textValue='Value from other page'")
End Sub
Now in the Page_Load of the other page, pull the query string value out and assign it to the text box, like this:
Protected Sub Page_Load(sender As Object, e As EventArgs)
If Request.QueryString("textValue") IsNot Nothing Then
YourTextBox.Text = Request.QueryString("textValue").ToString()
End If
End Sub
You have to write code on first page
Protected Sub Button1_Click(sender As Object, e As EventArgs)
Response.Redirect("webpage2.aspx?textValue='value'")
End Sub
On second page
Private Sub Page_Load(sender As Object, e As EventArgs)
If Not IsPostBack
SecondPageTextBox.Text = Request.QueryString("textValue").ToString()
End If
End Sub
The following code inserts same data two time in database table, but I want it to insert only one item when button is clicked.
What is the problem in this code?
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
If RadUpload1.UploadedFiles.Count >= 0 Then
Dim file As UploadedFile = RadUpload1.UploadedFiles(0)
SqlDataSource1.InsertParameters("photo").DefaultValue = "./upload/" & file.GetName()
'SqlDataSource1.InsertParameters("name").DefaultValue = TextBox1.Text
SqlDataSource1.Insert()
ListView1.DataBind()
End If
'UpdateProgressContext()
End Sub
You must be using both OnClick="Button1_Click" in your markup and Handles Button1.Click in your procedure.
Try removing one of them.
Every time I click the Delete Button, the check marks double in quantity:
Public Class About
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim di As New IO.DirectoryInfo("C:\Images\")
Dim imageArray As IO.FileInfo() = di.GetFiles()
Dim image As IO.FileInfo
'clear imageArray
'list the names of all images in the specified directory
For Each image In imageArray
CheckBoxList1.Items.Add(image.Name)
Next
End Sub
Protected Sub btnDelete_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnDelete.Click
For count As Integer = 0 To CheckBoxList1.Items.Count - 1
If CheckBoxList1.Items(count).Selected Then
File.Delete("C:\Images\" & CheckBoxList1.Items(count).ToString)
End If
Next
End Sub
End Class
The checkboxlist isn't refreshed so that the checkbox that I deleted is removed from the checkboxlist. How do I accomplish that? Thanks!
On a button click, Page_Load is ran again, so the code that adds the checkboxes is ran a second time.
Add a check for Page.IsPostBack, and only add the checkboxes if it is not a postback.
If Not Page.IsPostBack Then
For Each image In imageArray
CheckBoxList1.Items.Add(image.Name)
Next
End If
(I hope syntax is right... Not used to VB)
the whole content of the Page_Load event handler has to be executed only once in your case, so rewrite it like this:
If Not IsPostBack Then
Dim di As New IO.DirectoryInfo("C:\Images\")
Dim imageArray As IO.FileInfo() = di.GetFiles()
Dim image As IO.FileInfo
'clear imageArray
'list the names of all images in the specified directory
For Each image In imageArray
CheckBoxList1.Items.Add(image.Name)
Next
End If
i have a textbox control in asp.net. textbox have a search button beside it. On clicking the search button i redirect to new page with the value in textbox. the new page also hase textbox and button beside it. I set the value sent from previous page to the textbox on new page. If i change the value on new page and click the search button it should take the new value. But it takes the previous value.
on page load method wrote the following code.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
str1 = Request.QueryString("str1").ToString()
flag = Request.QueryString("flg")
txtsrch.Text = str1
End Sub
On button click following code
Protected Sub bsrcnew_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles bsrcnew.Click
Dim s As String
s = txtsrch.Text
If (flag.Equals(0)) Then
Response.Redirect("newSearch.aspx?str1=" + s)
ElseIf (flag.Equals(1)) Then
Response.Redirect("termsnew.aspx?str1=" + s)
End If
end sub
can any1 tell me how do i get changed value in textbox?
Try assigning it in a
If(!IsPostBack)
{
str1 = Request.QueryString("str1").ToString()
flag = Request.QueryString("flg")
txtsrch.Text = str1
}
On buttonclick its again assigning the value from query string.
Use IsPostBack to set your text box only on the first run in the second page. Example:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack
str1 = Request.QueryString("str1").ToString()
flag = Request.QueryString("flg")
txtsrch.Text = str1
End If
End Sub
How do you set focus to a specific control in a datagridview row after clicking the edit button? I'm able to do it for a new row when the grid is binding, but not for an existing row. The control doesn't seem to exist yet.
'This doesn't work (existing row)
Protected Sub gvDays_RowEditing(ByVal sender As Object, ByVal e As GridViewEditEventArgs) Handles gvDays.RowEditing
Try
gvDays.EditIndex = e.NewEditIndex
gvDays.Rows(e.NewEditIndex).FindControl("txtDayText").Focus()
Catch ex As Exception
Helper.WriteException(ex)
End Try
End Sub
'This does work for a newly bound row
Private Sub gvDays_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvDays.RowDataBound
If e.Row.RowState = DataControlRowState.Edit Then
e.Row.Cells(3).Controls(0).Focus()
End If
End Sub
gvDays_RowDataBound should work, the problem is you are looking at e.Row.RowState using the = operator, but RowState is a bitflag
try this
Private Sub gvDays_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvDays.RowDataBound
If (e.Row.RowState And DataControlRowState.Edit) = DataControlRowState.Edit Then
e.Row.Cells(3).Controls(0).Focus()
End If
End Sub