Hey just wondering if my syntax is wrong here
<asp:UpdatePanel ID="UpdatePanel2"
runat="server"
UpdateMode="Always">
<ContentTemplate>
<asp:textbox id="searchProductName" runat="server"></asp:textBox> <asp:Button ID="btnProductSearch" runat="server" Text="Search Product Name" CssClass="search" OnClick="ProductSearch_Click" UseSubmitBehavior="true" CausesValidation="false" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnProductSearch" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
and my OnClick method
Protected Sub ProductSearch_Click(ByVal sender As Object, ByVal e As EventArgs)
' Filter by ProductName
If searchProductName.Text.Length > 0 Then
srcProductListPerCustomer.FilterExpression = " (productName like '%" + searchProductName.Text.ToString & "%')"
productListTable.DataBind()
Else
srcProductListPerCustomer.FilterExpression = ""
productListTable.DataBind()
End If
End Sub
The problem is nothing is happening when I click on the button. The button works fine without the Ajax
Your button doesn't need to be in an UpdatePanel. The controls in a UpdatePanel should be the controls that are to be updated asynchronously. Put your UpdatePanel around the GridView you're updating, and use the AsyncPostBackTrigger in the same way.
It's best to keep UdpatePanels as small as possible; the fewer controls inside them, the less HTML will be sent back from the server (less bandwidth, faster request/response time). PostBackTriggers can refer to controls outside of the UpdatePanel with no problems.
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'm having some trouble getting a command link in a gridview to maintain it's ability to change tabs after the initial postback. So below you will see the structure of my content (heavily simplified):
<ajaxToolkit:TabContainer runat="server" ID="tabBody">
<ajaxToolkit:TabPanel runat="server" ID="tabPanel1">
<ContentTemplate>
<asp:UpdatePanel runat="server" ID="updPanel1">
<ContentTemplate>
<asp:Gridview runat="server" ID="grd1" OnRowCommand="grd1_RowCommand" OnRowDataBound="grd1_RowDataBound">
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="lnkChangePanels" runat="server" CommandArgument='<%#Eval("id") %>' CommandName="gotopanel2" Text='<%#Eval("FirstName") & " " & Eval("LastName")%>' />
</ItemTemplate>
</asp:TemplateField>
</asp:Gridview>
</ContentTemplate>
</asp:UpdatePanel>
</ContentTemplate>
</ajaxToolkit:TabPanel>
<ajaxToolkit:TabPanel runat="server" ID="tabPanel2">
<ContentTemplate>
<asp:UpdatePanel runat="server" ID="updPanel2">
<ContentTemplate>
<asp:Gridview runat="server" ID="grd2">
</asp:Gridview>
</ContentTemplate>
</asp:UpdatePanel>
</ContentTemplate>
</ajaxToolkit:TabPanel>
</ajaxToolkit:TabContainer>
In order to fill the gridview on panel 1, there is a search box which the user types into and I call a function to bind a linq query to it.
Now I add the rowcommand as a postback trigger on rowdatabound:
Protected Sub grd1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.DataRow Then
Dim lb As LinkButton = CType(e.Row.FindControl("lnkChangePanels"), LinkButton)
If Not lb Is Nothing Then
ToolkitScriptManager1.RegisterPostBackControl(lb)
End If
End If
End Sub
Then here is the code I have to trigger the tab panel to change (and do some other stuff):
Protected Sub grd1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles grd1.RowCommand
Dim id = e.CommandArgument.ToString()
Select Case e.CommandName
Case "gotopanel2"
eventDetails(id, "C")
tabBody.ActiveTab = tabPanel2
End Select
End Sub
This causes a proper postback and changes the tab, everything works as intended. But if I go back to the first tab and try clicking another row in gridview 1, nothing happens.
Is there a way to structure this so the that either the tab can change without losing the postback trigger or am I going about this all wrong?
Thanks.
Postback trigger is not lost. Problem is caused by individual UpdatePanels in each tab.
Put entire TabContainer within UpdatePanel and you can remove UpdatePanels from tabs (but you don't have to). Make sure that UpdateMode of that new panel is set to "Always".
I think the reason why it does not change in your example is that UpdatePanel only refreshes it's own content and attribute that decides if tab is visible or not is set for div (tabPanel) outside that UpdatePanel. When you go back to tab with grid you do it client-side by clicking on it and that's when it goes wrong.
To get to the bottom of the problem and figure out why it does work during the first postback you would probably have to debug ajax toolkit javascript for TabContainer control.
i'm trying to come up with a DateTime Picker in ASP.Net using textBox, Calendar, Button and Updatefields.
if a user clicks a button the panel with a hidden calendar will become visible, and if a user selects a date calendar's visibility will become false and he date will be assigned to textBox.
My problem comes if a user wants to change month because in this case calendar will disappear because selectionChange is being triggered.
My question is how can I fish out the changing of the month and bound the hiding of the panel only if a date is selected?
thank you very much in advance.
here are the code samples:
front part:
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<asp:TextBox ID="TextBox2" runat="server" />
<asp:ImageButton ID="Imbut" runat="server" ImageUrl="imagesNew/calender.png" Height="17px" Width="17px" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Calendar1" EventName="SelectionChanged" />
</Triggers>
</asp:UpdatePanel>
<br />
<br />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Panel ID="Panel1" runat="server">
<asp:Calendar ID="Calendar1" runat="server" Height="129px" Width="209px">
</asp:Calendar>
</asp:Panel>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="Imbut" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
back part
Protected Sub Imbut_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Imbut.Click
Panel1.Visible = True
End Sub
Protected Sub Calendar1_SelectionChanged(ByVal sender As Object, ByVal e As EventArgs) Handles Calendar1.SelectionChanged
TextBox2.Text = Calendar1.SelectedDate.ToString("dd/MM/yyyy")
Panel1.Visible = False
End Sub
I struggled with a similar problem. The problem is (as you stated) on the postback the control gets reset. I never found a means to do this elegantly with asp.net controls. I was able to accomplish this using the jQuery calendar and asp:hidden field. Keeping it client side via javascript I was able to allow the user to navigate the calendar change dates etc. When a date was selected the values were set to both a textbox within the ui as well as a hidden field then on submission, the value within the textbox or hidden field was picked up server side and used (in my situation) as a filter parameter.
I am trying to trying to setup an updatepanel to update every X seconds, the problem is I don't want the control to actually refresh unless there is new data. So I currently have a child updatepanel in a parent UpdatePanel, the child updatepanel gets refreshed by a timer. But I can't seem to find a way to trigger the parent panel to update. Again, only when certain conditions(data changed) are met.
Sample Code:
<asp:Timer ID="Timer1" OnTick="Timer1_Tick" runat="server" Interval="10000"></asp:Timer>
<asp:updatepanel id="upParent" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label id="lblParenttime" Runat="server">Parent Time Here</asp:Label>
<asp:updatepanel id="upChild" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Label id="lblChildtime" Runat="server">Child Time Here</asp:Label>
</ContentTemplate>
<triggers>
<asp:AsyncPostBackTrigger ControlID="Timer1" EventName="Tick" />
</triggers>
</asp:updatepanel>
</ContentTemplate>
</asp:updatepanel>
Protected Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
lblChildtime.Text = Now.Tostring
if X = Y then
'Cause Parent to Update
lblParenttime.Text = Now.Tostring
end if
End Sub
You can trigger some javascript when you UpdatePanel refreshes with the following javascript code:
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_pageLoaded(YourJavascriptFunctionNameHere);
You could then put a hidden button on the other UpdatePanel and manually call the __DoPostBack from the javascript function you have hooked onto the UpdatePanel reload.
There is probably other ideas for how to leverage add_pageLoaded in your scenario but this should at least get you on the right track.
Have you tried upParent.Update() in the Timer1_Tick event when conditions are met ?
I have three radio buttons on a form - A, B, C. Each of these selections populates a dropdown list with data specific to the option. When the form loads, I set option A to be checked (as the default).
When I select buttons B or C, the AsyncPostBack triggers fine and the dropdown is populated. BUT, subsequently selecting A from either B or C does not trigger the event.
I suspect that because A was checked when the form loaded, the browser is not seeing any "change" to raise the event.
So what can be done to enable the default A button recognise it is being changed from B or C in order to raise the postback?
I have tried both setting the checked state of button A in code on inital loading of the page only (ie IsPostBack is False) and alternatively setting the checked attribute of the radiobutton in the html, with the same results. If I don't default the radio button the functionality works as expected, except I don't have the radio button and dropdown list defaulted when the page first loads.
The html...
<asp:RadioButton ID="radBook" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="Book" />
<asp:RadioButton ID="radCD" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="CD" />
<asp:RadioButton ID="radDVD" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="DVD" />
<asp:UpdatePanel ID="pnlTasks" runat="server" UpdateMode="Conditional" RenderMode="Inline">
<ContentTemplate>
<asp:DropDownList ID="dropShippingSize" runat="server" CssClass="dropdownMandatory"></asp:DropDownList>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="radBook" />
<asp:AsyncPostBackTrigger ControlID="radCD" />
<asp:AsyncPostBackTrigger ControlID="radDVD" />
</Triggers>
</asp:UpdatePanel>
The code behind...
Sub Page_Load
If Not Me.IsPostBack Then
radBook.Checked = True
End If
End Sub
Private Sub rad_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles radBook.CheckedChanged, radCD.CheckedChanged, radDVD.CheckedChanged
zLoadShippingSizeDropdown()
End Sub
I had the same problem and looked for an answer for hours. This seems to have nothing to do with ViewState or anything similar, but with some kind of incompatibility of using a pre-checked RadioButton as trigger for an Async PostBack.
The work around I found is amazingly easy and worked right away; instead of using the checked=true on the mark-up or myRadioButton.Checked on the server side, I did the following:
Not setting the attribute on Mark-up and add this on the Page_Load event:
if (!IsPostBack)
{
MyRadioButton.InputAttributes["checked"] = "true";
...
}
I hope this helps and saves some people hours of hair pulling :)
I'm guessing you need to need to check if the page is a postback in your load event:
protected void Form_Load(object sender, EventArgs e)
{
if (!Page.IsPostback)
{
// Set radiobutton A...
}
}
We had the same problem and it seems you will have to set the other "checked" property for radio buttons to "false".
So please add the lines
radCD.Checked = False
radDVD.Checked = False
Are you by chance handling viewstate in your code behind as well? If so then you need to handle the AJAX version of it as viewstate can often be lost on AJAX style pages. Try putting your buttons inside the update panel and see if you get the same behaviour if the panel has it's update mode set to conditional. Don't worry about the postback triggers if you do that.
The asynch triggers are only for items inside an update panel. any item outside of a panel will doa full postback by design.
<asp:UpdatePanel ID="pnlTasks" runat="server" UpdateMode="Conditional" RenderMode="Inline">
<ContentTemplate>
<asp:RadioButton ID="radBook" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="Book" />
<asp:RadioButton ID="radCD" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="CD" /><asp:RadioButton ID="radDVD" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="DVD" />
<asp:DropDownList ID="dropShippingSize" runat="server" CssClass="dropdownMandatory">
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
WOW, I would have never thought that could be the bug. Saved many hours of frustration.
Thanks Juan going through the carppy Microsoft issue and found a solution for the rest.