VS 2010 FileUpload Empty During Partial Postback?
Nov 17, 2010
I have a FileUpload control inside of an update panel that I would like to use to do async file uploads. The issue I am having is that during the partial post back, the FileUpload control is empty. I was under the impression that through an update panel doing the full page life cycle that it would pick up the use input.Am I incorrect here? Can this somehow be done or do I need to do the traditional full page post back to get this to work?
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Similar Messages:
May 7, 2015
Here is the sample code am trying.
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server" EnablePartialRendering="true" />
<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="conditional">
<Triggers>
<asp:PostBackTrigger ControlID="Button1" />
[Code] ....
This upload is working. But why the page is getting refreshed? this is not partial post back and instead it 's full post back. i have read the articles for the fileuplaod with issue inside the update panel. is there any way to achieve this asynchronous upload on button click?
I don't want to use the Ajaxtoolkit Asyncupload because that will upload (Ref : [URL] ....] the moment when we seelct the file itself which i don't want to do that. i need to do on the button click event.
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Dec 19, 2013
I have a web application which has rather a lot of controls. I also have several buttons (add, edit, save, cancel). Most of my content page is in an update panel so it does not process the whole page. On form submit I have some javascript code which shows a div 50% opacity and an animated gif to prevent users clicking on the buttons more than once whilst it is processing the data to the server. Here is the javascript / call:
Code:
onsubmit="overlay();"
function overlay() {
el = document.getElementById('overlay');
el.style.display = "inline";
document.getElementById('Image2').src = "../Images/loader.gif";
}
function removeoverlay() {
el = document.getElementById('overlay');
el.style.display = "none";
}
The problem is it the form disables like I want it and the giff animates for about 1.5 seconds but it does not enable the form for a further 4 seconds.
Is there anyway to see what it happpening at this point. If I put some watches in my code behind it runs through less than a second so what else can it be doing.
Also on some laptops the form does not fit vertically so there is a scroll bar. When the div is shown on a submit it does not do the full screen including the scroll area.
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Oct 14, 2010
I have a FileUpload control in an UpdatePanel and when user select a file, the full file path will will be stored in a hiddenfield, and during postback, i would like to assign the full file path in the hiddenfield back to the FileUpload control textbox, possible to achieve that?
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Oct 5, 2010
How to check FileUpload Control Empty or not?
I tried the following code,
But it was not working.
if ((this.FileUploadPanelToExcel !=null ))
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Oct 5, 2010
I think this is something really easy that I am missing. I have a loop that is sending emails. The loop adds an attachement from a FileUpload instance. The first run of the loop is fine but each subsequent run the attachment is empty. I have found mention of reseting contentstream.position to 0 but that doesn't seem to apply to the FileUpload control. I am attaching the code below.
[Code]....
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Feb 25, 2016
I am making a student registration form. For photo upload i want that when user open registration form then bydefault image should be shown and if user does not upload any image then by default image should be inserted in database but if user upload the image then that image should save in database.
For photo upload i have taken this code
<asp:Image ID="UserImage" runat="server" Width="140px" ImageUrl="~/images/default.gif" />
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:Button ID="btnUpload" runat="server" Text="Upload"
CausesValidation="false" onclick="btnUpload_Click" />
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Oct 19, 2010
I couldn't find something similar in SO.
In ASP.NET, is there any way that on cue I can cause a partial postback with Javascript in an UpdatePanel?
I tried __doPostBack() but it does a full postback. I can trick it with a dummy button and fire click() then handle the partial postback that way, but I want a more graceful way than trickery.
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Jun 4, 2010
How do I detect whether a postback is a partial postback from any of my Update Panels?
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Jan 31, 2011
In a page contains two UpdatePanels, How can I know which UpdatePanel causes the partial PostBack ?
I mean in the Page_Load event handler.
This is my code:
[Code]....
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May 27, 2010
can we check postback is partial postback or whole page postback ?
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Jun 10, 2010
Is there a difference, or are the terms synonymous? i could only find the difference between a full postback and a callback. I'm already aware of how a full postback is different.
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Aug 25, 2010
I have this jquery functions below in external file. So after partial postback jquery is not working. I need to load jquery from server side on partial postback.
can someone show me what I need to call in this code and how to load jquery
[Code].....
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Mar 6, 2011
I;m trying to get a value from the gridview to a text box... but it always turns out blank... but on the webpage it shows there is a data.
TotalNonCashToPay = CDbl(GridView1.Rows(ii).Cells(16).Text)
this is my full code
vb Code: .....
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Feb 1, 2010
I have a page that uses AJAX updatepanels. On this page, we have some radio buttons with Autopostback set to true. The problem is that after the postback, the control was losing focus so that when the user would hit tab, control would be restored to the first control on the page and not the drop-down which fired the event. As a fix, I wrote some set focus code in the radio button's oncheckchanged event. This seems to have fixed the problem with the focus. The problem I have is that the browser loses its scroll position every time I click on one of these radiobuttons. Is there a way to maintain scroll position? Maybe there is another way to resolve my original problem of setting focus that will prevent this from happening.
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Dec 4, 2010
i have one label out of update panel and one button inside update panel. in button click event i update the label text. when i run the code and click on button then partial postback occur and button click event fire but label value is not change. if i put the label too in the update panel then label value change at the time of button click. i do not understand why label value is not getting updated. suppose if i want that label should stay out of update panel and label value should change at the time of partial postback then how to write the code. i dont want put the label in any update panel.
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Feb 8, 2011
i have some time consuming serverside function so i try to execute each function step by step and inform the user about the progress.
So my approach was:
create a visible button that performs an asynchronous postback and handle the click event on serverside execute the first function update a Label to inform the user if the function was executed successfully register a javascript that triggers the click-event of a second invisible(Style="display: none") button that is also registered as asynchronous trigger for the UpdatePanel send page back to client and execute script to click the invisible button handle the button-click, inform user, register js for third invisible button, execute button-click and so on...
But the problem is that the UpdateProgress-control will not be shown although i've set the AssociatedUpdatePanelID correctly. The functions are all triggered correctly and the labels are getting updated, only the UpdateProgress keeps invisible.
[Code]....
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Mar 14, 2011
I have a few Link Buttons on my AJAX enabled page, all basically the same:
[Code]....
Here's the OnClick method they're attached to:
[Code]....
I ensure these LinkButtons trigger Async in my Page_Load method:
[Code]....
Then on the page there are three UpdatePanels (as called in the btnCampus_Click method). All are similar to this (only the ContentTemplate changes):
[Code]....
why the UpdatePanel's aren't triggered when clicked. I've been using UpdatePanels for a long time, but I can't seem to figure this one out.
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Feb 20, 2011
After Partial Postback i am trying to clearing my textbox'e with value's but it's not clearing ??
if i don't want give another button for resetting the value
my code
[Code]....
My Mrkup-
[Code]....
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Jan 19, 2010
I've coded myself into a state of confusion. I have a form with a postal code TextBox and a country DropDownList both inside an UpdatePanel. When the selected country is changed, the DropDownList auto posts back and sets the regular expression used for validating the postal code. The country DropDownList also has a RequiredFieldValidator. The first item in my DropDownList is empty (Value = Text = String.Empty) and when I select this item, I momentarily see the RequiredFieldValidator appear and then disappear. It seems that the client side script is displaying the error message, but then after my partial postback it disappears. I can see in the country DropDownList's SelectedIndexChanged event handler that the RequiredFieldValidator has IsValid = false, so why doesn't the error message stay visible?
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Jan 20, 2011
I have a web app which implements IHttpAsyncHandler for handling web service calls asynchronously, done according to this web page:
[URL]
Now, my page is rather complex with many update panels, so when I initiate the AsyncHandler with BeginProcessRequest, the page does a partial postback, then when EndProcessRequest is called, another partial postback, everything is fine so far...
But when I navigate around my page and causes a partial postback between BeginProcessRequest and EndProcessRequest, nothing gets updated when EndProcessRequest is called...
In debug, EndProcessRequest IS CALLED in the server codebehind, but nothing updates clientside... I'm not even sure if it even caused a partial postback...
I'm a pretty big noob when it comes to this Async stuff, and I just followed the site above, so I'm guessing it maybe something behind the principle of how IHttpAsyncHandler works.
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Aug 26, 2010
I'm working on ASP.NET 4.0 and I'm having problems for saving the selected value in a DropDownList.
I initialize it in the Web Control's PreRender method as follows:
if (!Page.IsPostBack)
LoadCountryList();
Where LoadCountryList's code is:
private void LoadCountryList()
{
var vr = new CountryRepository();
var countryList = vr.GetAllForList();
DdlCountry.EnableViewState = true;
DdlCountry.DataValueField = "code";
DdlCountry.DataTextField = "name";
dlCountry.DataSource = countryList;
DdlCountry.DataBind();
}
After I submit the form, I've noticed the DropDownList is empty(it's not before postback). If you take a look at my code, I've enabled the ViewState for this control, but I'm not getting any results yet. Does anybody know what's going on?
EDIT:
Here is the simple code of the control in the aspx file:
<asp:DropDownList Runat="server" ID="DdlCountry">
</asp:DropDownList>
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Dec 2, 2010
I've looked at answers to some similar question but I still can't seem to figure this out. I think I'm misunderstanding something about how ASP.NET works.In the standard ASP.Net 4.0 'Create a new Account' form, I've added a DropDownList containing Roles to be selected for the new account. in the aspx page, the control looks like this:
<asp:DropDownList ID="RoleList" Width="100px" runat="server"></asp:DropDownList>
I am then populating the List in the Page_Load Event:
protected void Page_Load(object sender, EventArgs e)
{
RegisterUser.ContinueDestinationPageUrl = Request.QueryString["ReturnUrl"];
[code]....
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Jan 29, 2012
I'm stuck getting a value from a textbox in code behind. I have tried
Code:
string s2 = txtEmployeeNr.Text;
and
Code:
string s1 = Server.HtmlEncode(txtEmployeeNr.Text);
And just get an empty string.
I have used the last one before with good results.
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Jan 20, 2011
I am working with a user control which is inside an UpdatePanel. The user control uses swfobject to add a flash object to a div in the user control. Part of the functionality of the user control is it allows the user to change 'channel'. The channel is set and handled in the code behind hence the call in the JavaScript below to <%=channel%>.
The problem I have is that when the new channel is saved, the JavaScript code below is still pointing to the old channel. The only way I can fix this is to refresh the page via the code behind, but I'm thinking there must be a better way to do this..
[Code]....
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