I am having a problem when the textchanged event of the textbox object is triggered. For example, when I want to press the tab key, it should focus on the next object, but it does not. Or when I click a button, I have to click twice. How can I solve this? I added the codes and the problem I was having as a gif.
default.aspx
<asp:UpdatePanel ID="UpdatePanel1" UpdateMode="Conditional" runat="server">
<ContentTemplate>
<div class="form-group row">
<label class="col-lg-2 col-form-label">İşlem Tutarı</label>
<div class="col-lg-4">
<asp:TextBox ID="txtTutar" CssClass="form-control form-control-sm price" AutoPostBack="true" placeholder="0,00 ₺" runat="server" OnTextChanged="txtTutar_TextChanged"></asp:TextBox>
</div>
</div>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="txtTutar" EventName="TextChanged" />
</Triggers>
</asp:UpdatePanel>
default.asp.cs
txtTahsilEdilen.Text = txtTutar.Text;
You can dump the trigger - it will do nothing of value for you. You need to set AutoPostBack="true" for that text box - and the trigger will not help you.
Then what on earth is the trigger for then?
It is used to trigger ANOTHER SEPERATE panel on the same page!!!
So, you can have a button in a panel, even a text box. They STILL MUST do a post back here - and you need/have to add the post-back to the text box.
What the triggers do? Well, say you have a 2nd update panel - and has a bunch of things in it. Well, your code behind might update BOTH panels.
Hence, you would add a trigger to the 2nd panel that points to your text box (or button in the first panel). Now when that first panel update panel updates (due to a post-back), the 2nd panel with the trigger tag and settings will ALSO refresh.
However, the FEATURE DOES NOT AUTO POST back for you. So specifying a trigger into the SAME update panel is not required, does not make sense, and will do NOTHING at all for you.
Unless a post back IS TRIGGERED then the trigger settings do nothing at all, and they do not cause a post back, and they do not case the button code, or in this case the text box event code to run.
So, the triggers settings would in theory be placed in a 2nd and different update panel that you want to also re-fresh when one button (or text box) cases a post-back in the other update panel. However for this to work, YOU STILL MUST cause and have a post-back to occur.
So the purpose here is to not make the update panel post-back, but only to detect that a ANOTHER DIFFERENT panel REALLY DID JUST do a postback.
No matter which way we note and explain the above?
The trigger settings does NOT trigger the button or text box post-back - that is your job to make that occur. the trigger setting in the update panel can thus be set that some post back by a given button occurred, and then ensure that the panel with the trigger will also update. But for the same panel - there is no practical meaning or reason to do this, since the trigger tags only EVER work WHEN you cause a post-back. And the trigger settings are to ONLY point to buttons or controls in a DIFFERENT update panel.
Bottom line:
Remove the trigger tag - don't need it.
Set the text box to have auto postback = true
Related
I have tried for so long to understand why my LinkButton text toggles to say "on" when its clicked, however when I click the button again the text still says "on" even though in my code behind file I set LinkButton.text = "off". I have run the debugger and when I set the text to "off" its like
the setter method doesnt actually update that specific LinkButton object, as the next click its like it never got updated.
I am using this to test why my panel inside a gridview template field wont toggle its visibility on and off, as the same thing happens with that where I click a button to make the panel visible which it does, then when I press the button again the panel should disappear but it stays on the screen.
My goal is to have each row in a gridrow have a toggle link button that displays a panel that drops down below each row.
So the essence to my problem is, why can I toggle a control on, but cannot toggle it off?.
My markup is essentially the same as below. Note all the actual proper server attributes are left
out for sake of clarity.
I've tried setting viewstate to false but that doesn't help.
The funny part is, I place the LinkButton and Panel outside of the
gridview and it does exactly what I expect it to do which is toggle
on and off or set the panel to visible or hide.
I ready some other posts but I don't fully understand the issue.
I have read that some people say its about nesting controls inside other controls but I am just not certain how this is causing an issue.
UpdatePanel.Visible = true has no effect
http://forums.asp.net/t/1773859.aspx?C+Visible+true+not+working
My other thought is that the button is rendered at a stage that is too late for me to make a change that will be placed on the final html?
Can anyone give me any pointers?
<asp:GridView>
<Columns>
<asp:TemplateField>
<ItemTemplate>
<div id="wrapper">
<asp:LinkButton ID="LinkButton1" runat="server"
CommandArgument='<%# ((GridViewRow)Container).RowIndex %>'
Text="off" oncommand="changeName"></asp:LinkButton>
</div>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
code behind
protected void changeName(object sender, CommandEventArgs e)
{
GridViewRow row = MyGridView.Rows[Convert.ToInt32(e.CommandArgument)];
LinkButton button = (LinkButton)row.FindControl("LinkButton1");
if (button.Text.Equals("off"))
{
button.Text = "on";
}
else
{
button.Text = "off";
}
}
I solved the issue by removing my 'EnableViewState = "False"` on the gridview.
After reading this article
http://forums.asp.net/t/1590532.aspx?Visible+invisible+panel+inside+Gridview
It gave me some ideas on the whole postback process.
I am not sure if this is correct but it kind of makes some sense to me?
If my gridview is disabling viewstate and its the parent to all nested controls such as 'Panel' and 'LinkButton' then the state of those nested controls will be lost across postback. So any
dynamically made changes I modified in the code behind file would be lost if the changes were not
being retained in the viewstate of the gridview.
There is probably a better way of achieving my design but for the moment leaving viewstate
on the parent control seemed to fix it.
I ma trying to figure out what is the issue here.. when i disable Viewstate for usercontrol inside my updatepanel, its just not updating the content.
here is my code:
if i set Page ViewState-true its working fine but its does not hide it when i need it .
<asp:UpdatePanel ID="CheckoutUpdatePanel" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<uc:ClickAndCollect ID="ClickAndCollectPanel" runat="server" Visible="false" EnableViewState="false" />
</ContentTemplate>
</asp:UpdatePanel>
======================
My User Control
My UserControl is also wrapped inside updatePanel..
--: it does not have any effect of ViewState even if i disable it. Its just working fine on other page
please help.
Thanks,
Milan P
when i disable Viewstate for usercontrol inside my updatepanel, its
just not updating the content.
Since you're UpdatePanel's UpdateModeis "Conditional", you need to Update it manually.
For example somewhere in an event handler where you want to show/hide it:
ClickAndCollectPanel.Visible = false;
CheckoutUpdatePanel.Update();
UpdatePanel.Update Method
Call the Update method if you have server code that must execute to
determine whether an UpdatePanel control should be updated. If you
plan to use the Update method, set the UpdateMode property to
Conditional. If you want the decision to update the panel in server
logic, make sure that the ChildrenAsTriggers property is false and
that no explicit triggers are defined for the panel.
I think you should have ViewState information enabled always
for doing update with Update Panel.
The update panel will refer the control state using ViewState even
for partial request. This is why sometimes people say ASP.Net is evil,
since it sends the whole page view state for every ajax request as parameter.
So i think update panel/asp.net ajax heavily rely on view state for ASP.Net Ajax
Look
http://encosia.com/why-aspnet-ajax-updatepanels-are-dangerous/
Limiting view state information on AJAX calls
I am working in asp.net application. I have a checkbox and three textboxes inside an updatepanel. I have another updatepanel. I am using Jquery to hide show the textboxes. I want to update the second updatepanel contents as well on first updatepanel's checkbox check/uncheck ( which already has client events) How can I do this ?
I don't want to use __doPostBack('__Page', 'MyCustomArgument'); because it will postback whole page.
Please suggest.
I might be misunderstanding your requirements but you can always force the second update panel to refresh from the code behind
SecondPanelId.Update();
I could have missed something of course
To force update from javscript then I would try
function forceAJAXPostback()
{
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm._doPostBack('btnIntheUpdatePanel','');
}
I know you said not _doPostBack - but because you are specifying the button within the update panel it should do the partial postback you require. If there isn't a button then put one on and hide it with css i.e. display:none
This is a good explanation of the technique.
You would also need to ensure that the button is specified as an async trigger in the updatepanel markup
<asp:UpdatePanel>
<!-- rest of panel -->
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnIntheUpdatePanel" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
I have a control inside of an UpdatePanel. The UpdatePanel has an AsyncPostBack trigger associated with the inner control. This works just fine.
I have another control containing a SSRS ReportViewControl that I would like to conditionaly hide based on the results from the postback event of the UpdatePanel mentioned above.
The ReportViewerControl is not inside of an UpdatePanel and I would like to keep it this way. How can I hide the ReportViewerControl based on the postback event of an UpdatePanel inside of another control?
I am assuming that many problems would spring up if I place the ReportViewerControl inside of an UpdatePanel, anyone know for sure?
You could create a script inside you update panel content template and hide your control form javascript.
<script type="text/javascript">
Sys.Application.Add_load(MyFunctionThatHides);
</script
The ReportViewerControl is not inside of an UpdatePanel and I would
like to keep it this way.
I did a simple trick. I created a another Updatepanel and put a literal control side the update panel and this update panel code Is Above the "Control you want to hide"
something like this
<asp:UpdatePanel ID="UpdatePanel5" runat="server" UpdateMode="Always" >
<ContentTemplate>
<asp:Literal runat="server" ID="literal1"></asp:Literal>
</ContentTemplate>
</asp:UpdatePanel>
Then in Code behind I inject CSS
something like this
literalDvControl.Text = "<style> #YourControlID{ display:none;}</style>";
This seems to be working. Basically literal control is injecting style tag and browser is very quick to react.
but do read about this .
Using <style> tags in the <body> with other HTML
Hide the content through server side code but rather to use javascript (possibly injected by the server through a postback) as suggested by Machinegon.
Have a second UpdatePanel around the other content that you want to hide. (You can't make the current one bigger, but making a second shouldn't cause problems.) Have that second update panel set the same button as the trigger. (You can have a trigger that's outside of the update panel, you just can't update content outside of the update panel.) If the update is conditional (you only sometimes change the content when the button is clicked) then you can set the only trigger for the second panel to be a hidden button which you Click in code from the handler of the first button click.
You can use following code after processing the Async AJAX call on server and just before returning the response to client/browser
this.Page.ClientScript.RegisterStartupScript(this.GetType(), "ShowHideReportViewerJSScript", <JS code to show/hide reportviewer>, true);
I assume you have scriptmanager placed on the ASPX page
Is this typical behavior of the UpdateProgress for an ASP.Net UpdatePanel? I have an update panel with the UpdateProgress control inside of a user control window on a page.
If I then make the page in the background do some loading and click a button in the user control update panel the UpdateProgress does not show up at all. It's like the UpdatePanels refresh request is not even registered until after the actual page is done doing it's business. It's worth noting that it will show up if nothing is happening in the background.
The functionality I want is what you would expect. I want to loader to show up if it has to wait for anything to get it's refresh done when after the button is clicked.
I know I can get this functionality if I just use jquery ajax with a static web method, but you can't have static web methods inside of a user control. I could have it in the page but it really doesn't belong there. A full-blown wcf wouldn't really be worth it in this case either. I'm trying to compromise with an UpdatePanel but these things always seem to cause me some kind of trouble.
Maybe this is just the way it works?
Edit:So I'll clarify a bit what I'm doing.
What's happening is I have a page and all it has on it are some tools on the side and a big map. When the page initially loads it takes some time to load the map. Now if while it's loading I open up the tool (a user control) that has the update panel in question in it and click the button on this user control that should refresh the update panel with new data and show the loading sign (in the updateprogress) then the UpdateProgress loading image does not show up. However, the code run by the button click does run after the page is done loading (as expected) and The UpdateProgress will show up if nothing on the page containing the user control is loading.
I just want the loader to show up while the page is loading.
I thought my problem was that perhaps the map loading is in an update panel and my UpdateProgress was only being associated with the update panel for the user control's update panel. Hence, I would get no loading icon when the map was loading. This is not the case though.
I'm not completely following exactly what you're doing here, but I'm assuming you've taken what's in your user control and verified that it works correctly if placed directly in the page?
As a side note, I'm personally ripping out UpdatePanels and replacing with jQuery replacements due to the significant performance savings in addition to the fact that it's way more time-effective to figuring out jQuery et al. quirks instead of ASP.NET AJAX quirks. To be honest, I wish I could claw back the time I did invest in UpdatePanels/ASP.NET AJAX.
I believe I understand your issue after reading your OP several times. I have run into this situation myself with difficulty getting an UpdateProgress to work on Page_Load. The solution? Don't fire the server-side event initially on Page_Load. Add an AJAX Timer that is inside an UpdatePanel like below:
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Timer ID="ajxTmr1" runat="server" Interval="1000" OnTick="ajxTmr1_Tick" />
</ContentTemplate>
</asp:UpdatePanel>
The on the timer tick event, do your server code as required. If you have an Update Progress wired up to the UpdatePanel above, everything should work properly.
<asp:UpdateProgress ID="UpdateProgress1" runat="server" DisplayAfter="0" AssociatedUpdatePanelID="UpdatePanel1" Visible="false">
<%--Panel or whatever goes here--%>
</asp:UpdateProgress>