this is very hard to explain and give code based on it. So thank you now if you even try to help
I have a form with a update panel. This posts the form and validates it. Returning a errorMessage string of any invalid field such as "Field xyz is a required field, Field abc needs to be a quantity"
When I enter incorrect date it posts back fine and displays the text in a div at the bottom of the page which the update panel is aimed at to update. (and only this it should be changing)
This works but the second time I hit say (say i enter invalid data twice) the Complete form will disappear leaving me with just the banner of the site and the error message that is returned.
Ive tried commenting out the entire of the code post back so that the button doesn't actually do anything but it still has the same problem(of course this time it wouldnt have a error message created)
So i can only think it is something to do with the updatepanel itself and how it works but i have been staring at this for ages and have no more ideas!
Very difficult to answer this without some example code. Have a look at what your codebehind is doing to your page and be aware that within your update panel, your postback is actually an AJAX callback. Your page is executed again but only the contents of the update panel are re-renderd and only the same contents are supposed to be updated on the client side.
Often, when I have issues on the second or subsequent postback it is to do with initialisation code running when I don't want it to.
My advice is to look into where you are checking if (Page.IsPostback) and if (Page.IsCallback) and play around with these. Perhaps your need to protect your serverside code that handles the form within the following block:
if (Page.IsCallback)
{
}
I found the issue (after about 5 hours) but don't understand it. The updatepanel that was disppearing had the updatepanel I was using outside of it
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnTabs" />
</Triggers>
</asp:UpdatePanel>
<asp:PlaceHolder runat="server" ID="phldActionButtons" />
The placeholder had inside it the control with my update panel I was using.
The closing updatepanel you can see was the content of the form
By simply moving the placeholder inside of the contenttemplate it seems to have resolved the issue. (not sure why it would hide/remove a whole updatepanel which only relation to it was that it was the form it was validating on the postback!
I just struggled with a similar problem. After about 5 hours, I decided to try this:
UpdateMode="Conditional"
for my UpdatePanel and it stopped causing a second postback!!!
Related
I have a user control with a delete button. When a button is clicked, an event fires which deletes a record from the database. Now, the control is placed in Default.aspx. The whole body markup of Default.aspx (including the user control with its button itself) resides in <form runat="server"> as required by ASP.NET. Everything works so far.
However, the problem is when I put some validation controls inside Default.aspx (meaning inside <form runat="server"> because otherwise the page will report server errors). When validation controls are added, the delete button in the user control stops working. Clicking on this button no longer triggers the event as before.
Now, I disabled event validation in Default.aspx using EnableEventValidation="false" directive. I am also including UnobtrusiveValidationMode = System.Web.UI.UnobtrusiveValidationMode.None; in the code behind file. However, none of this helps.
How do I fix this problem and make the button clickable?
Update:
I know for sure that the validation controls are causing the problem, because I only need to add EnableClientScript="False" to each of them, and the button becomes clickable. But I don't want to rewrite validation on the client side manually!
It turns out the PostBack cannot occur if the form is not IsValid regardless of what element causes it. As long as that element (button) is inside the form with runat="server"that is invalid, the posback will not happen.
A very simple workaround is to just make the Button in my user control bypass validation: CausesValidation="False" (thanks to this question).
Another solution and maybe a more efficient one, is to use ValidationGroup. This way, all TextBoxes together with the Submit Button will belong to one group, and those controls that do not belong to that group will NOT be validated. In fact, they might have their own ValidationGroup; this will avoid interference between different controls within one Web Form.
I've an Asp.net .aspx page. I am taking a simple contact us page for example. The page has 3 fields- name/email/question. The scenario is, A user entered a wrong email address, in response, system shows an error message by checking it to a Regex.
Now if user hits back browser button or backspace key, browser displays the same page without error message- that means 1 step behind.
If user does 2 concurrent mistakes-
1)Leaves name box empty, hits Submit (error message displays says all fields are mandatory).
2)Wrong email, hits Submit (error message displays wrong email entered)
Now if user hits back browser button or backspace key, browser displays the same page with previous error message (for empty box) i.e 1 step behind. Again hits back, displays same page without any error message, i.e 2 steps behind.
I do not want the back button or backspace to do these unwanted actions. I also do not want to disable back button or not to cache anything.
What I need, when user hits back button or backspace, they should be landed to the previously browsed different page, not the same page. That means, I do not want browser cache to hold page during multiple postbacks. Rather, cache should hold page only once when it landed initially.
I heard sometime that this approach called smartnavigation, I tried googling but couldn't find something very useful and optimized. This was the best article I found yet (not sure this is what I am looking for).
http://support.microsoft.com/kb/913721
The problem is, I am not fully sure How to exactly reference this issue.
I hope my question is pretty straight forward (I tried to be clear). Please let me know if something is not clear.
I would greatly appreciate any kind help.
Thanks in advance.
I believe you could just put your controls inside an UpdatePanel with UpdateMode set to Always i.e.
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Always">
<ContentTemplate>
// Your controls
</ContentTemplate>
</asp:UpdatePanel>
You will also need a ScriptManager inside the Form element of the Page e.g.
<form id="form1" runat="server">
<asp:ScriptManager runat="server" EnablePartialRendering="true" />
....
</form>
This will stop the Page doing a full postback and should stop the behaviour you have described. I would also use client side validation with a RegularExpressionValidator or RequiredFieldValidator etc.
Here is another solution.
Try to add
<% Response.CacheControl = "no-cache";%>
above the "head" tag
I'm using .net 2.0. This is a project that I have taken over for another developer.
I have a aspx page that can take a long time to display under certain condition due to loading items from the database. What I want to do is to show a loading animation or something to let the user know the page is loading, so I tried to use the JQuery .ready() method, however, I can only see the results after the page is fully loaded. What I mean is that when I click on a link to my aspx page, nothing is drawn until all of the work is done. The work is done on the server side in Page_Load.
I'm looking for best practices of having the page display, even if all the user sees is an animation. Right now it appears as if something is wrong because it can take a while (over 15 seconds in some cases) before the page draws.
You might be able to use Asynchronous Pages to do this
http://msdn.microsoft.com/en-us/magazine/cc163725.aspx
One way to take the page loading code out and place it in a image button with a transparent image.
Then wrap any sections of the page that will be updated in an update panel.
Once the page has loaded you can click the hidden button with jQuery to load the data, and the update panel will handle a loading icon if you have set up a progress template.
asp:
<asp:UpdatePanel runat=server id=upMain>
<ContentTemplate>
<asp:gridView runat=server id=gridView>
<asp:ImageButton runat=server id=hiddenLoadButton>
</ContentTemplate>
</asp:updatePanel>
in button click:
protected void hiddenbuttonclick(object sender, eventargs args)
{
gridview.DataSource = yourDataSource;
gridView.DataBind();
}
jQuery:
$(document).ready(function(){
$("#hiddenLoadButton").click();
});
Another option would be to use an ajax method to load the data.
In the flow, you are coming to the database call prior to the JQuery method passing all of its information to the page. There are two solutions to this, I can see:
Get the data via AJAX after the page load
Explicitly control the HTTP Response stream and flush after the JavaScript is sent
Without seeing the code, I cannot offer a specific answer to your issue.
Some weird stuff is happening, I am converting an application that used to use javascript to open another web page in a tiny window for data input to use a ModalPopupExtender.
It seems to work fine, but in the OK event, when I do txtData.Text (the textbox in my modal popup), it comes back with a comma before the data, so if you type "Rabbit", it comes back as ",Rabbit".
Also when I use it multiple times, in another place where I might click to show it, and type "Fish", it starts coming back with stuff like ",Rabbit,,Fish"
I don't know why or how to stop it from doing this... any ideas?
Same here. No clue for why it happens. Every postback initiated by buttons within the panel adds commas and previous values to all text fields.
Hooking into TextBox.Text setter revealed that the corrupted data comes from postdata collection. So it means that just before postback the ModalPopupExtender corrupts the data.
P.S. I'm not using UpdatePanel, but regular Panel so there are no triggers associated with buttons.
Updated: Solution found.
The problem seems to go away when rolling back to May's release of AjaxToolKit (http://ajaxcontroltoolkit.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=27326).
Just sharing this solution to everyone on this problem. Try not to use asp control instead use html.
*<input type="text" id="txtID" runat="server" class="myClass" />*
this works fine for me.
Thanks,
I also found a forum indicating that it may be standard html behaviour for when there are multiple controls on the form with the same name. This in mind (and assuming there is a bug in the ajax controls) The way I coded around it was to add in my Page_Load the following kind of statement for each of my textboxes.
string[] vals = txtValue.Text.Split(Convert.ToChar(","));
txtValue.Text = vals[vals.Length - 1];//It appears my latest value was always in the last item
Since the form load happens before the button event I sort out my fields before they get to the event that deals with their values.
I had a similar problem, having a jQuery Dialog inside an UpdatePanel. As I could read on different sites, the problem is caused by duplicates inside the DOM tree.
In the end I found a very simple solution. I assign the dialog to the div, then open or close it by JavaScript and then run this little peace of code to remove the duplicates:
var count = $(".dialog").length;
for (i = 1; i < count; i++) {
$(".dialog").first().remove();
}
EDIT: it turned out not to be SO simple. In the end, my code looked like this:
In document ready (and also asynchronous page calls):
function AddDialog() {
var dlg = $(".dialog").dialog({ autoOpen: false });
dlg.parent().appendTo($("form:first"));
var targetSelector = ".myDialog"; // watch out: can't use ID here!
if (mustOpenDialog) {
$(targetSelector).last().remove(); //-- remove last copy
var dlg = $(targetSelector).dialog({ autoOpen: true });
var count = $(targetSelector).length;
for (i = 1; i < count; i++) {
$(targetSelector).last().remove();
}
}
if (mustCloseDialog) {
$(targetSelector).dialog("close");
var count = $(targetSelector).length;
for (i = 1; i < count; i++) {
$(targetSelector).first().remove();
}
}
}
In my complete code, mustOpenDialog and mustCloseDialog are set in codebehind.
I had the same problem with previous values coming back comma separated. It seemed that my ok button was inside the update panel and I had it in the triggers section aswell. Removing the button from the triggers section of the updatepanel solved the problem.
best regards - Tobias
My answer was similar to Smarty's. My page looked like this...
<UpdatePanel>
<GridView>
<Button> <-- These buttons fire modal popup programmatically.
<Button>
<Button>
</GridView>
<ModalPopup>
<HiddenField> <-- Dummy target of modal popup.
</UpdatePanel>
The fix was to change it to this...
<UpdatePanel>
<GridView>
<Button> <-- These buttons fire modal popup programmatically.
<Button>
<Button>
</GridView>
</UpdatePanel>
<ModalPopup>
<HiddenField> <-- Dummy target of modal popup.
I had to register each button as a postback control with the scriptmanager on the gridview rowdatabound event. The down side is that I have more full postbacks. But, it solved the problem.
This is pretty late reply, but I am documenting it here so that other may benefit.
My Scenario
Open user control inside jquery dialog on button click. This user control had update panel inside it and few textboxes. First time open the dialog, it worked like charm. On subsequent clicks to open the dialog, I noticed a weird behavior. I had few textboxes inside the user control(inside update panel). On any partial post back, the text of textboxes changed to current text, current text. If the value of textbox was fish, then upon any partial postbacks its changed to fish, fish.
The reason for this was I was using jquery to open the dialog. I also appended the dialog to form upon the click of the button.
dlg.parent().appendTo($('form:first'));
So on subsequent clicks multiple user controls where appended to DOM and hence while building the post back data, there existed more than one control with same id and hence there values where appended using "," - comma.
So my solution was simple, while closing the dialog, I just removed it from DOM
I got hint from following link. Posting it here for future reference
here
For some reason it doesn't seem to happen if the textbox is set to ReadOnly.
I'm thinking there could be a workaround by displaying an editable textbox to the user, catching the keystrokes to it, and updating a readonly textbox that is hidden from the user.
Still a bit messy, but I can't roll back to May's release because there's another bug in that release with the ComboBox that I need to avoid!
UPDATE:
As a bit of background, I have a user control (ascx) inside my modal popup because I need to reuse it. The ascx has to handle the user's input itself (the containing page doesn't know what's going on inside the control) so when the user clicks a button I do a callback and process the data. If a successful result is returned to the client callback function then I simulate a click of what the containing page thinks is the "OK" button which is actually invisible to the user.
I've changed my code to add a hidden, readonly textbox and copy the text from the original textbox into the new one every time the text changes.
<asp:TextBox runat="server" ID="txtName"></asp:TextBox>
becomes
<asp:TextBox runat="server" ID="txtName" onchange="document.getElementById(this.id + 'RO').value = this.value"></asp:TextBox>
<asp:TextBox runat="server" ID="txtNameRO" ReadOnly="true" style="display:none;"></asp:TextBox>
then when passing values back in the callback instead of getting the value of txtName, I use txtNameRO.
I don't think this will help if you're doing a postback, but you could add a callback before the postback like I have. Hopefully this will help someone anyway!
I had this issue and lost quite a bit of time on it and found that it was caused by an extra tag hiding out that I forgot to remove when changing markup.
Make sure on the .aspx page all tags line up correctly.
<div>
**Lots of code here**
</div> <-- That guy owes me a vacation!
</div>
I have successfully implemented a complete hack based on Jen's response. I use an asp:HiddenField to hold the value I want to post back, and I populate it with a pure HTML input box
<asp:HiddenField ID="txt" runat="server"/>
<input type="text" onchange='document.getElementById("<%= txt.ClientID %>").value = this.value;' />
This is lighter weight than Jen's solution as you're still only posting back one server control.
BTW, this is a very significant bug in the Ajax Toolkit. You can vote and comment on it here:
CodePlex Issue
Pretend you're in Chicago. Vote early, vote often.
For me the solution was to get the modal poup out of the main update panel. Once I did that the commas went away. If you truely need an update panel inside of the modal popup, create one of it's own inside that panel.
I did not need to roll back to previous version of the toolkit.
I have been trying to solve this for a day now and some very helpful person in my office has come up with a terrific solution!
We moved the ModalPopUpExtender and subsequent pop up panel controlled by the extender to ouside of the outermost UpdatePanel on the page, created a fake button and gave the ID of the fake button to the TargetControlID property of the ModalPopUpExtender.
<asp:Button runat="server" ID="dummyButton" CausesValidation="false" Style="display: none" />
<cc1:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="dummyButton" CancelControlID="CancelPopUp" PopupControlID="PanelID" BackgroundCssClass="modalBackground" />
Inside my forms/page where the PopUp extender and panels used to be, I created an OnClick event on the button that we used to use to trigger the ModalPopUpExtender.
<asp:ImageButton ID="ButtonID" runat="server" Text="Add" ImageUrl="~/Images/Add-32-1-small.png" OnClick="LoadPopUp" />
On my button that triggers the ModalPopUpExtender, I have created an OnClick event called "LoadPopUp" - in LoadPopUp in the code behind I simply put ModalPopUpExtender1.Show();
protected void LoadPopUp(object sender, EventArgs e)
{
ModalPopupExtender1.Show();
}
I had the same problem except I am not using the AjaxControlToolkit or update panels. My problem was solved by moving the <form> tag from the ASP.net master page to the page where the textboxes are. May help someone.
has same problem and i found the solution here: http://ajaxcontroltoolkit.codeplex.com/workitem/26259
The problem is ajax last version, just INSTALL year 2009 ajax version and modalpopup will work fine with your actual code.
Tuve el mismo problema y encontré la solución en el link que indico arriba.
El problema viene con las versiones recientes de ajax, simplemente instala la version del año 2009 y el modalpopup funcionará bien con tu código actual.
The solution is to get the modal popup out of the main update panel. Once Do that the commas will go away. If you truly need an update panel inside of the modal popup, create one of it's own inside that panel.
I've got a web application working using VB and Ajax. I'm using updatepanels to avoid the irritating "flicker" on postbacks to the server.
I would like to have a button control defined within the updatepanel itself (tried moving it outside and got some catastrophic error, so left it there) that makes the current panel not visible and a sibling panel visible. This works with the exception that the button must be clicked twice. Not double clicked, but clicked once than clicked again.
In setting breakpoints I discovered the code behind that's attached to the button is actually being executed on the first click, but the panels don't switch as expected. If I click the same button OR worse yet, a different button, the expected behavior of the second panel appearing occurs. However, with the second button being clicked there's an unwanted bonus of a third panel being displayed, the third panel being made visible due to the second button being clicked.
I'm assuming this behavior is due to the updatepanel and its Ajax nature. Is there a way to avoid the second click? Am I misusing the updatepanel? I really wanted to use a modal popup (right out of the AjaxToolKit) but had problems with posting back the data so I opted for this approach. Any insights, assistance, even criticism would be welcome as this has plagued me long enough. Thanks
If you get rid of the UpdatePanels do things work as expected with PostBacks? Chances are something in your Page_Load or other event higher up the chain are "resetting" things in some way before it gets to your click event. Could this be the case?
I think your problem is that only the update panel is receiving data from the server after the method executes. The panel your are trying to change is outside of the update panel so it does not know that its properties have changed.
You either need to do a full page postback or have the panel you wish to modify inside the update panel.
I have run into this before and resolved it, I just can't remember how. I will try to find my old code and get back to you. one thought, do you have EnablePartialRendering enabled in your scriptmanager? maybe try wrapping both containers in a third panel.
Your update panel is sitting inside the other panels.
Should that be the other way around? AFAIK only controls within the update panel will get updated in via the AJAX call.
Here's a fairly simple solution. (I was having the same problem this morning.)
The UpdatePanel can't render stuff outside itself. So, as you noticed, the updates are happening, but you're not seeing the result.
The easiest solution is to force a full postback. You can do that like this:
protected override void OnInit(EventArgs e)
{
var scriptManager = ScriptManager.GetCurrent(this);
// or this.Page in a UserControl, etc.
scriptManager.RegisterPostBackControl(someButton);
scriptManager.RegisterPostBackControl(someOtherButton);
// etc. for each control that needs to update something outside the UpdatePanel
}
This still allows the buttons themselves to be updated in the UpdatePanel by Ajax (e.g. changing their state to disabled or enabled). The full postback only happens if the buttons are clicked.
Like others have said an update panel only updates its contents, thats one of the main benefits of using it.
Panel2 and pnlPrvCmt need to be inside your update panel for your button click method to work. Another option would be to put Panel2 inside one update panel and pnlPrvCmt inside a second update panel. Then any control inside either update panel will cause both to refresh, as long as the UpdateMode=Always (which it is by default).
Try giving the dynamic control an ID when it is created. For some reason this is required by .net for a dynamic control to work in this context.
myControl.id="newID"
I have found this to occur under 2 different scenerios:
No ID set on the control. Either the ID is left off of the markup or the the ID was not set when a dynamic control was created. ASP.Net uses the ID to track actions.
Nested UpdatePanels. Scenerio: When using a Masterpage, you might have a content placeholder that you wrap in an UpdatePanel so that an UpdatePanel is not needed in the content on the page. Then, in developing your page you might, as a habit, add an UpdatePanel.