Web Forms :: Dynamic Checkboxes Not Firing Oncheckchanged Event?

Nov 29, 2010

I'm sure the answer to this problem is very simple, however, I've been racking my brain on this one. I am adding rows/cells to a table dynamically.

[Code]....

When I check or uncheck the box, it fires the page load and not 'MarkFormCompleted'. No matter what I do, I can't get it to fire 'MarkFormCompleted'.

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i am using VWD(visual web developer 2008) and DOTNET 3.5

i have a page on which i dynamically add multiple datalist controls on the oninit event of my page , on postabck i again add all these datalist controls to the page on oninit event

the template for all the datalist controls is defined using the ITemplate interface, the template defined for each datalist control contains a button which has a event handler attached to onclick event.

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1. chkresponse = new System.Web.UI.WebControls.CheckBox[cnumber + 1];
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Jun 7, 2010

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[Code]....

So I am incrementing the cookie I am using to track the page number and then rebinding the repeater.

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[Code] ....

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[code]....

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[Code]...

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Apr 27, 2010

I've dynamically created 3 checkboxes as you can see in the code below. I also wrote an event handler below. When I run the code, the 3 checkboxes show up, but the event handling does not work right. Whenever there is postback from any of the 3 checkboxes, Label1 reflects the state of checkbox #3, no matter if I toggle checkbox #1 or #2. I put the code I have under Page_Init into Page_Load instead, but makes no difference either way.

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[Code]....

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[Code]....

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Jul 15, 2010

Im using a Repeater to generate Items out of a Database. Each ReapeaterItem should include an UpdatePanel, because i have to Update the Controls inside the UpdatePanel and do not want to reload the complete page. Inside these dynamically generated UpdatePanels (each RepeaterItem has one) im adding up to three Checkboxes dynamically (based on the Database). These Checkboxes need to fire the "CheckedChanged" event, because on some conditions i want to enable/disable/check/uncheck Checkbox1, 2 or 3 based on business logic. ... Hope you got this so far. Im adding all Controls and have the EventHandler Added. But the generated Code does not reflect the Event Handler. I tried OnItemDataBound, OnItemCreated, PreRender, ... Events to add the Eventhandler too, but i was not able to find the CheckBox-Control with the ID.

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aspx-Page
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Here is the Page_Load Part

protected void Page_Load(object sender, EventArgs e)
{
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{
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{
if (crInRepeater.GetType() == typeof(RepeaterItem))
{
foreach (Control crInRepeaterItem in crInRepeater.Controls)............

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Oct 18, 2010

The example .aspx page below includes a grid containing two checkboxes. The first is hidden because its ItemTemplate.Visible is set to false. What is the cleanest way to avoid OnCheckChanged when the parent cell is not Visible?Paste sample below into new .aspx and run. Uncheck 'Visible' Click 'Test'Expected Results (since only the 'Visible' checkbox was changed):

Visible
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[code]...

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[Code]....

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To make it a little more complicated the list of checkboxes is actually dynamic and is built from another table.In the normal ASP.NET page, all the controls are placed in a details view and the dynamic list of checkboxes is added to a placeholder on Page_Load. Then I get the list of values that are true and, for each row in the list, use FindControl to find the checkbox with the appropriate ID and set it to flagged.

I've got the MVC page working so far as follows:

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I can also add, and edit the fields that are in the table with the single row that needs to be edited.

What I'm stuck on is:

Populating the appropriate checkboxes with "true" as appropriate

Subsequently saving any updates to the checkboxes when the save button is clicked.

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I have a code below...that dynamically create a checkboxlist.....

....connection code....
Dim da As New SqlDataAdapter(myDBCommand)[code]....

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[Code]....

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<ajaxtoolkit:AccordionPane ID="accordianPaneAroundTheCheckbox" runat="server">
<Content>
<asp:UpdatePanel ID="updatePanelAroundTheCheckbox" runat="server" >
<ContentTemplate>
<div>
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</div>
</ContentTemplate>
</asp:UpdatePanel>
</Content>
</ajaxtoolkit:AccordionPane>

We have something like the above. Extra stuff has been left off as it is a large page.

I place a breakpoint at the begining of Page_Load and DoBar. The first time I click the checkbox, the breakpoint on Page_Load is hit, but DoBar is not. The second time I click the checkbox, both breakpoints are hit.

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I've been reading up on the problems with dynamically created controls and how they have been solved. The posts I have come across are creating the controls in a panel or some other open place. I can't seem to get my checkbox to fire the event from inside a gridview. below is the code behind from inside the GridView PreRender event.

[Code]....

..And the Checked Event..
[Code]....

So after all this, nothing happens. I get the postback flash but my command inside the checked event doesn't fire.I tried putting the dynamic creation of the checkbox in Page Load with no effect.. I think because I can't place the checkbox inside the GridView under page load.

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[Code]....

It goes through the code, sends me an email, gets to End Sub, then loops right back to the top of the sub and goes through the whole thing again, sending me a duplicate email, then exiting normally and sending them to the About page. This is the only code in the aspx.vb besides the class def and inherits statement.

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I have a two web forms with griviews that are bound to SQL through the same query in a class. Both have the same columns and footers. Both have a checkbox control in each grid row. The checkboxes on each form have OnCheckChanged event handlers that I put in the code behind. In fact, the html code is almost the same on both forms, and the OnCheckChanged code is exactly the same except for the fact that I have named them differently. AutoPostBack is true for both checkbox controls in the gridviews. One works, the other doesn't. The difference between the two is that the gridview row checkboxes that don't work are burried in a MultiView. Could that be why the codebehind event handler doesn't fire? Here is the html for the column:

[Code]....

Here is the html for the header of the gridview:

[Code]....

Here is the codebehind:

[Code]....

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