I have this code in form:
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:TextBox ID="Text1" runat="server"></asp:TextBox>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:TextBox ID="Text2" runat="server"></asp:TextBox>
<asp:Button ID="Submit" runat="server" OnClick="Submit_Click"
Text="Click Me"/>
</ContentTemplate>
</asp:UpdatePanel>
When I click on Submit button, the all form is posted back on server (Text1 and Text2). I want to post back only textbox in UpdatePanel (Text2). Is it possible?
Thank you for responses.
EDIT (Solution):
I think, I have solution using Javascript:
function onSubmit() {
var text1 = this.document.getElementById('<%=Text1.ClientID%>');
text1.disabled = true;
return true;
}
....
<asp:Button ID="Submit" OnClientClick="onSubmit();" ..../>
It cause that Text1 will be disabled before PostBack. It seams that ASP.NET do not post back values from disabled textboxes. Hovewer, this works only without UpdatePanel. Of course, Text1 is empty after postback.
Well, the UpdatePanel controls what get's posted back. You cannot change that behavior. It should be posting the form data for the UpdatePanel only (I believe), plus the entire ViewState. It has to post the entire ViewState for the page lifecycle to work.
Related
I created a simple control which uses an update panel with a button click trigger and yes a script manager above the control. Click the button and a label is updated with the current time and this has worked fine for 6 years
Today, I changed the page to be responsive with Bootstrap but this is irrelevant to this question.
The control was added to a page which has labels and textboxes (simple form with first name / last name).
<asp:TextBox ID="txtFirstName" runat="server" CssClass="form-control input-lg" Placeholder="Your First Name" MaxLength="20" Required="true"></asp:TextBox>
If I remove:
Required="true"
and click the button in the control the date / time updates but placing this back stops the date / time updating. I need to use both as I wish for the first name to be required but also for the time to update
Simple Example:
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="lblTime" runat="server" Text=""></asp:Label>
<asp:Button ID="btnRefreshTime" runat="server" Text="Refresh Time" OnClick="btnRefreshTime_Click" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnRefreshTime" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
Code Behind:
Protected Sub btnRefreshTime_Click(sender As Object, e As EventArgs)
lblTime.Text = DateTime.Now.ToString()
End Sub
What am I doing wrong and what would I need to do to resolve it without opening the form up to abuse (script attacks) etc? I don't wish to add the following to the page directive:
ValidateRequest="false"
Thank you in advance
Probabily the button server side event is prevented to execute due to the client side validation of required = "true".
Try to change the button with somewhat else which does not trigger client side validation by design. I would try with a LinkButton.
I have created Website. After I login When I hit enter key for add Product, my Website just kick me out.? I dont have problem with adding my cart with mouse click. Does Any One have same Issue or Any suggestion ..
You need to add your controls inside an ASP:Panel and make your AddProduct Button as Default Button:
<asp:Panel ID="panel1" runat="server" DefaultButton="btnAddProduct"">
//Your Other Stuff
<asp:Button ID="btnAddProduct" runat="server" onclick="btnAddProduct_Click"/>
</asp:Panel>
This will Fire AddProduct Button when you hit enter.
Regards
Here is another approach I found here - if you don't want to add a panel
<asp:Button ID="btnDisableEnter" runat="server" Text=""
OnClientClick="return false;" style="display: none;" />
<form id="form1" runat="server" DefaultButton="btnDisableEnter">
If you are using Master Page in asp.net C# and if you are using a button for logout, please type in Button:
<asp:Button ID="btn" runat="server" Text="logout"
UseSubmitBehavior="false" />
Use UseSubmitBehavior="false" in your master page. That's how my problem was solved.
I have a repeater with a RadioButtonList inside the ItemTemplate, but when the RadioButtonList.OnSelectedIndexChanged event fires it generates a full postback. What have I done wrong in my code below? How can I get the OnSelectedIndexChanged to generate an Async Postback?
<asp:UpdatePanel runat="server" ID="UpdatePanel2">
<ContentTemplate>
<asp:Repeater ID="Repeater1" runat="server" DataSourceID="sqlOptions">
<ItemTemplate>
<asp:UpdatePanel runat="server" ID="pnlA">
<ContentTemplate>
<strong>
<%# Eval("Name") %></strong><br />
<asp:RadioButtonList ID="RadioButtonList1"
DataSourceID="sqlOptionValues" runat="server"
DataTextField="id" DataValueField="Id" AutoPostBack="true"
OnSelectedIndexChanged="LoadPrice"
ValidationGroup="options" />
<asp:RequiredFieldValidator ID="RequiredFieldValidator1"
ForeColor="Red" runat="server"
ControlToValidate="RadioButtonList1"
ErrorMessage="Required Field"
ValidationGroup="options" />
<asp:SqlDataSource ID="sqlOptionValues" runat="server"
ConnectionString="<%$ ConnectionStrings:
ConnectionString6 %>"
SelectCommand='<%# "SELECT DISTINCT OptionValue.Name,
OptionValue.Id FROM CombinationDetail
INNER JOIN OptionValue
ON CombinationDetail.OptionValueId = OptionValue.Id
WHERE (OptionValue.OptionId =" +
Eval("Id") + ")" %>'>
</asp:SqlDataSource>
<br />
</ContentTemplate>
</asp:UpdatePanel>
</ItemTemplate>
</asp:Repeater>
</ContentTemplate>
</asp:UpdatePanel>
Many thanks for any help :)
This is a real-world use case. I have a page with Repeaters, Ajax Accordions inside of other Accordions, Update Panels inside other Update panels, you name it. The page works great, except when I want to update one of the Accordion panels with my RadioButtonList (RBL). Even with the RBL inside an update panel, it causes a postback of the entire page. I tried everything. I finally realized it wasn't me when I noticed my buttons would work just fine. I figure it must be a bug in either the framework or the Ajax Control Toolkit. I did find people reference this link all over the web (http://blog.smarx.com/posts/the-case-of-the-radiobuttonlist-half-trigger.aspx), but this link from 2007 is dead now and probably no longer applicable, so that's no help.
What I ended up doing was going with what works - that submit button. All I did was add an onclick attribute to the RBL to call a hidden button. Now you don't want to set the button to Visible=false because then the button won't appear in the generated markup. Instead, set the button's style to display:none; so that no one will see this hack, because yes, that's what this workaround is - it's a hack, but simple and just as effective as what you'd expect. Don't forget to remove the Autopostback="True" from your RBL.
CAVEAT: Because I'm using a hacked button for the onclick event, it's possible for the user to click in the area of the RBL, but not actually select an item. When this happens, our onclick triggers an AsyncPostBack and the codebehind logic will be processed, so please keep that in mind. To give you an idea of what I mean: all the Page_Load() events will be called, but rbl_Questions_SelectedIndexChanged() won't be if they happen to click in the area of the RBL without actually selecting an item. For my purposes this causes no issues in my logic and has no effect on the user.
Here's the Code:
Somewhere In the .Aspx Page:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:RadioButtonList ID="rbl_Questions" runat="server"
OnSelectedIndexChanged="rbl_Questions_SelectedIndexChanged">
</asp:RadioButtonList>
<asp:Button ID="btn_rbl_Questions" runat="server" style="display:none;"/>
<asp:Label ID="lbl_Result" runat="server" Text="" Visible="false">
</asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
In the Page_Load() event:
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack == false)
{
//Instead of using the AutoPostback of the RBL, use this instead.
rbl_Questions.Attributes.Add("onclick",
"document.getElementById('"
+ btn_rbl_Questions.ClientID
+ "').click();");
//Bind your RBL to a DataSource, add items programmatically,
// or add them in the aspx markup.
}
}
In the rbl_Questions_SelectedIndexChanged() event:
protected void rbl_Questions_SelectedIndexChanged(object sender, EventArgs e)
{
//Your code here.
//My code unhid the lbl_Result control and set its text value.
}
Update 05/24/2011
The above "hack" is no longer necessary (I am leaving it above since this was marked as the answer by the author). I have found the best way to do this, thanks to this SO Answer:
Updatepanel gives full postback instead of asyncpostback
The code is much simpler now, just remove what I put in the Page_Load() method and remove the Button I used in the Aspx page and add ClientIDMode="AutoID" and AutoPostBack="True" to the control you want the UpdatePanel to capture.
Somewhere In the .Aspx Page:
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:RadioButtonList ID="rbl_Questions" runat="server"
ClientIDMode="AutoID" AutoPostBack="true"
OnSelectedIndexChanged="rbl_Questions_SelectedIndexChanged">
</asp:RadioButtonList>
<asp:Label ID="lbl_Result" runat="server" Text="" Visible="false">
</asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
MS changed how ClientID's are generated in .net 4.0 from "AutoID" to "Predictable" and I guess the ScriptManager or UpdatePanel's weren't updated correctly to use it. I can't find documentation on why that is anywhere or if it was left that way by design.
I seriously don't miss winforms.
Try this:
<asp:UpdatePanel runat="server" UpdateMode="Conditional" ID="pnlA">
You'll also need to setup
<Triggers>
//radio buttons
</Triggers>
Not sure how you'll do that since it's a dynamically built list.
I have an ajax panel (actually it' a Rad Ajax Panel - the behavior is similar to an Ajax Update Panel with everything in the ContentTemplate section and no Triggers), with an image button (asp:ImageButton) and a button (asp:Button).
I notice that they behave differently - the image button advances to postback (Page_Load and Button_Click server functions), when the button doesn't!
How can I achieve this behavior with the Button too? (Replacing the Button with an ImageButton solved the problem... Is there a way to maintain the Button and have the ImageButton's behavior?)
This is what my code looks like (two buttons, two click functions, and two client click functions):
<telerik:RadScriptManager ID="RadScriptManager1" runat="server">
</telerik:RadScriptManager>
<div style="width: 800px;">
<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" LoadingPanelID="RadAjaxLoadingPanel1">
<telerik:RadScriptBlock ID="RadScriptBlock1" runat="server">
<script type="text/javascript">
function validateSave() {
// ...
return true;
}
function validateAdd() {
// ...
return true;
}
</script>
</telerik:RadScriptBlock>
<asp:Panel ID="Panel1" runat="server" Visible="false">
<fieldset>
<legend>New item</legend>
<%--..........--%>
<asp:ImageButton ID="Button4" runat="server"
ImageUrl="~/App_Themes/ThemeDefault/images/add.gif"
OnClientClick="return validateAdd();"
OnClick="Button4_Click" />
</fieldset>
<%--..........--%>
<asp:Button ID="Button2" runat="server"
OnClientClick="return validateSave();"
Text="Save" ToolTip="Save" OnClick="Button2_Click" />
</asp:Panel>
</telerik:RadAjaxPanel>
<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server">
</telerik:RadAjaxLoadingPanel>
</div>
UpdatePanels can often be problematic with Buttons. An easy thing that you can do is move the Button out of the UpdatePanel. After all, the more contents in your UpdatePanel, the slower the asynch postback will be.
I'm having a FileUpload control on a aspx page inside a UpdatePanel with a button on click of which I want to set a label with the filename of the selected file.
Here is the code I have:
ASPX PAGE:
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:FileUpload runat="server" ID="fuSimple"></asp:FileUpload>
<asp:Button runat="server" Text="Button" ID="btnPostback"
onclick="btnPostback_Click" />
<br />
<asp:Label ID="lblFileName" runat="server" Text="File Name: "></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
</div>
Code Behind:
protected void btnPostback_Click(object sender, EventArgs e)
{
lblFileName.Text = "File Name: " + fuSimple.FileName;
}
Every time I hit the button, I'm getting an empty string. What am I missing?
Also, when I do this without UpdatePanel it works fine.
Comments/help appreciated.
The FileUpload control is not supported with ASP.NET AJAX and Asynchronous Postbacks. They require a full postback due to the nature of how a file upload works (multipart form data).
The following question should have useful answers: FileUpload control inside an UpdatePanel without refreshing the whole page?