ASP Checkbox Value Incorrect When AutoPostBack Is Set To False
Sep 1, 2010
I have an asp:checkbox control on an aspx page I am working on. This checkbox is within a custom control and previously was posting back every time it was clicked. I am in the process of ajaxifying the page and have come across a problem. When I remove the attribute AutoPostBack="True" from the asp:checkbox, the vb code returns False when I check myCheckbox.checked (this is on a postback else where on the page what has not be ajaxified), even though I can see the box is indeed checked.
I am assuming that because the checkbox no longer posts back, for some reason the VB code (or the view state maybe) doesn't see it as having been checked. Is this correct, and if so, how to I correct it?
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Nov 27, 2010
When i take 55 checkboxes inside updatepanel then ..after selecting first checkbox the whole whole checkboxes will be refreshed and instead of showing images, it displays the checkboxes only in TFT monitors ... in wave form !!
how to insert checkbox checked value to textbox without autopostback
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Jan 9, 2012
For some reason, I can't change the checkbox from True to False when I click the checkbox in my DataGridViewCheckBoxColumn called "Select". I setup my DataGridView (dgvWBFOrphans) with 5 TextBox columns that are Read-Only and 1 CheckBox column that is not Read-Only. I use a stored procedure and data reader to load the DataTable which is used as the DataSource for dgvWBFOrphans. I want all the checkboxes to default to True and allow the users to uncheck certain rows in the "Select" column.
Dim dtOrphans As New DataTable
Using cnn As New SqlClient.SqlConnection(clsDBConn.clsDBConnections.prpConnString)
cnn.Open()
[code]....
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Aug 13, 2009
I would like to make a applcation that after checkbox inside datagridview is checked. After calcuation stuff, if result less than standard, then it set the checkbox to not checked state. But I find that checkbox in datagridview does not change. It changed after I click other checkbox. What I want is lagging one cycle. I tried dgv.refresh() or update event , no effect.
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Apr 4, 2012
I've read a few articles talking about checkboxes always returning a false state,[code]I though it was due to the second input that it was always returning a false state.
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Mar 18, 2009
i have a checkbox bound to a column with datatype character to my database... the column uses values Y and N.also, just like to add that i have tried changing the column into character of 5 byte so that it can hold the values "True" and "False" when the property bound is the property Checked. this works okay but there are some columns that doesn't use True and False like in my statement above.is there a way that i can set my checkbox to checked when the column value it is bound to is Y and vice versa.. i noticed that in the checkbox inside a datagridview has the properties TrueValue and FalseValue but i dont see this anywhere in the checkbox not in the datagridview.
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Mar 20, 2012
I am reading values from a database 0/1 false/true to populate the checkbox .The databse field is 'PPorCollect'. How can i figure out why the checkbox is not populating ?
OpenSQLConnection()
Dim mcommand As New SqlClient.SqlCommand("up_loadOrderID", conn)
mcommand.CommandType = CommandType.StoredProcedure[code]....
I populated a textbox with the value i was reading from the database.....Interesting the value is True/False not 0/1 like i was expecting...so i changed up the above code to the below code with no resolve....
Dim PPorCollect As Integer
PPorCollect = mReader("PPorCollect")
If PPorCollect = False Then[code]...........
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Jan 22, 2012
I have a GridView with a Checkbox on the first column: Code: The thing is that the Checkbox.Checked always returns False. How can I get the checked state of the Checkboxes in this scenario? Or what would be the best approach into updating the aforementioned column? P.S. Note that click on the checkboxes doesn't post back. Nothing happens on the page until the user clicks Save (and that is the intended behavior).
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Jun 4, 2011
I have created an Unbound DataGridView. It has has 4 Columns Name, Last Name, Picture, CheckBox. I would like to do change the checkbox's enabled state true or false (editable or not) at the time I add the row
Not its checked state :) and would also like to change image that is placed in the Image column cell during the add row.
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Apr 27, 2012
I have a project where I am taking multiple checkboxlists and totaling up points based on which boxes are checked in a certain list. I then display the sum of these points to a text-box. I do this for every checkboxlist.
The problem is this: when one checkboxlist gets changed, the other sums get removed from their respective text boxes. I have attempted this both with read-only set to True (which is the ideal setting in my case) as well as set to False (as per Problem in using AutoPostback in asp.net c#)
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Sep 3, 2010
I am trying to use something like a "state" combobox that when selecting a state only certain "cities" will be dispalyed in a second combobox.
I know this is possible in asp.net with autopostback, but vb I have no idea.
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Mar 3, 2009
It looks like this question was addressed here, but his solution did not work for me. I am creating a dynamic dropdown menu system that populates a secondary dropdownlist with the results of a query based on the selected item in the first dropdown.
First dropdown getting populated:
Dim db As New linqclassesDataContext
Dim categories = (From c In db.faq_cats)
[code].....
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Aug 13, 2010
i just want to make a program with first form to enter the serial if correct just continue to form2 if incorrect just a popup say like "Serial Incorrect" how i can make it ?
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Apr 12, 2011
Background: I have a winForm app that registers a user in the database based on the user input provided in the form, auto-generates a random password and username for the user, and e-mails the user a link to take an application based on the marketing company selected.
Problem: I got the bundles listbox to populate w/ autopostback set to true but the bundles listbox populates as soon as you click on an lbcarrier and it doesn't allow you select more than one carrier.how to allow multiselect with the postback feature on? Here's a screenshot of the interface:
code on default.aspx:
<td class="style1">
Carriers:</td>[code].....
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Apr 19, 2010
I have a master page than contains my ScriptManager. On a child page i have an updated panel. Inside the update panel there is a dropdowlist. When i set the autopostback=true i get OutofMemory Exceptions. All the time. also note that I have AjaxControlToolkit set on my web.config.
Here is parts of my Code.
MasterPage.aspx
<ajax:ToolkitScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true" ></ajax:ToolkitScriptManager>
Child Page
[Code]....
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Feb 15, 2012
I'm using the OnTextChange event on a textbox on an ASP.NET page. To have this working I have to put 'AutoPostBack=true'.
The problem is that the textbox is on the bottom of the page, and when the text changes it has to fill another textbox. This is working fine but when the event triggers the page refreshes and jumps to the top of the page, so I always have to scroll down again to see it. (Due to the autopostback)
Is there anything I can do to prevent it to jump to the top of the page?
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Nov 12, 2009
I have a number of dropdown lists that I'm trying to chain together and they all have autopostback. How can I tell which one of the dropdown lists was the one responsibe for the autopostback?
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Mar 2, 2010
I've got an odd situation with a text box and an autocomplete setup on my page. I'm using a JQuery based autocomplete on a text box that has AutoPostBack="True". This works perfect if I use the keyboard to select an autocomplete item, which then fires Jquery to fill in the text box, and then when I tab out of the box the AutoPostBack fires. If, however, I click on an autocomplete item, my text box loses focus first and the AutoPostBack fires before the Jquery has a chance to change the text in my text box. Is there a way to delay either the PostBack or the Jquery so that they don't fight each other? I'm thinking it may have to be the PostBack that gets changed, since the JQuery would lose it's state on the PostBack.
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Jul 6, 2011
Background: I have an web form that autpostbacks a list of bundles to a listbox based on the carriers selected. When Postback happens, all user entered data is cleared. How do I prevent the AutoPostback function from clearing entered data from the forms? [code]
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Apr 15, 2011
I have a question, I can't really find the answer...Basically I have 2 FormsIn form number 1 I have 2 pictureboxes. I want to create a checkbox in form2 that says if checkbox 1 is checked then show picture 1 in form 1
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Jan 2, 2012
I have a ListView with Checkboxes in vb.net and what I want to do is when the user check the checkbox, the program ignore the response of the user in checking the checkbox, instead it leaves the checkbox uncheck.
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Aug 15, 2011
I am creating an Interactive map which displays the facilities when the user clicks on the Checkbox, such as toilets.It will display all the toilet locations via PictureBoxes.I want to do this without having to write all this code?[code].....
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Dec 30, 2010
i have 5 checkboxes in webform and textbox1... when i search the record using the date specified in textbox1 when i enter 11-Dec-2010 in Textbox1 and click on submit button then checkbox1, checkbox2, and checkbox3 will be disabled and unchecked .....
[Code]...
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Feb 15, 2010
I've wondered if i can make it so when i click on a checkbox you may not beable to check another. And i do not want to use radio buttons
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Nov 22, 2011
I have a DataGridViewCheckBoxColumn who's column name is "booReadyToReport want to hide all the checkboxes in this column if "bintAnalyteCodeID" doesn't equal the selected value in a combobox on my form. ut I run this bit of code the DataGridView DataError event fires currently, have nothing in the event except an comment. he code seems to work, but I'm new to VB.NET and I'm wondering if this is the correct way to handle thishould I use the CellPainting event?
highlight rows with RBF3
For Each dr As DataGridViewRow In Me.dgvCalculatedResults.Rows
f dr.Cells("bintAnalyteCodeID").Value = Me.cbxAnalyte.SelectedValue Then
[code].....
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May 15, 2011
I have some DataGridView code written in vb.net. (Nothing is attached to a datasource.)The 4th column is a checkbox cell.How do I detect if that checkBox is checked or unchecked?This code strangely reports TRUE or FALSE at random times. It even turns ON the checkbox in rows other than the row I clicked in. (Huh?)
Private Sub DataGridView1_CellContentClick(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellContentClick
Dim whichGrid As DataGridView = CType(sender, DataGridView)
[code].....
I've tried countless other methods... none seem to actually get the checkbox ON/OFF value in vb.net.
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Jun 30, 2009
I've got a form with parent-child setup. The parent displays name and other demographic info.The child displays multiple addresses, one row at a time. There can only be one primary address for a name and this is designated by a checkbox at the top of the child form.If the user wants to change the primary address to another address,then they find the other address and click on the checkbox.The form checks the other addresses and if one is found that is designated as primary,the user is warned that one already exists and prompts them to change it.
So for example, a name has 2 addresses, the 2nd being the primary address.The user wants to change the 1st address to be primary.They click on the Primary Address checkbox for the 1st address.A warning displays that there is already an address listed as primary.The user then answers the prompt to change the 1st address to the primary address.The checkbox for the 2nd address will be unchecked and the checkbox will be checked for the 1st address.My problem is getting the checkbox unchecked for the 2nd address.If I close the form and reopen, then the checkbox is unchecked.How do I refresh the checkbox for the 2nd address?Here is the code I'm using to find if an address has already been marked as primary:[code]......
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Dec 16, 2011
I have 2 columns of checkboxes in a gridview, where the header also contains a checkbox. If i select the header checkbox, it will check all corresponding checkboxes in its colomnow, what I want to happen is if I select column 1 checkbox, column 2 checkboxes should get unchecked and vice-versa.
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
[code]....
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Dec 13, 2010
I am refreshing a form, and I want to assure the checkboxes are cleared when refreshing. I can clear the textboxes and masked textboxes, but cannot figure out to revert the checkbox back to the UnChecked state.
[Code]....
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Feb 8, 2012
Code:
Whenever the textbox says "Default" and I click on the checkbox, the msgbox pops up twice. Any way to fix this?
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