Post Back Does Not Work After Writing Files To Response?
Feb 25, 2010
What I have?I have a ASP.NET page which allows the user to download file a on a button click. User can select the file he wants from a list of available files (RadioButtonList) and clicks on download button to download it. (I should not provide link for each file that can be downloaded - this is the requirement).What I want?I want the user to download multiple files one by one by selecting the required radio button and clicking on the button.What problem am I facing?I can download the file for the first time properly. But, after downloading, if I select some other file and click on the button to download it, click event of the button does not post back and the second file will not be downloaded.I use the follwoing code on the button click event:
I have a button that when clicked, will generate a PDF and write it out to the response.This is the basic structure of the code:
try { using(Stream stream = generatePdf()) {
[code]...
Downloading the file works fine, except that it doesn't complete the postback.If I were to throw an exception above file.Transmit, the error handling would work properly and I would see the message get displayed in my browser. However, if there is an exception after the file.Transmit then nothing happens. The user saves/opens the pdf and the page does not reload.How can I make it so that the postback always completes, that way I can display an appropriate message to the user?
I am using Asp.net and requirement specifies i use html input to post files to server rather than asp:fileupload.[ Reason : Add more html input file controls similar to CPanel file manager.(i.e) clicking on link adds another file input from which user can select another file*.But when ever i post back Request Files collection is always empty.* HTML FORM:
<form method="post" enctype="multipart/form-data" action="documents.aspx"> <div> <input type="file" name="attachment" id="attachment" onchange="validate(this)" /> <span class="none">Filename should be within (1-25) letters long. Can Contain only letters & numbers</span> <div id="moreUploads"> </div> <div id="moreUploadsLink" style="display: none;"> <a href="javascript:addFileInput();">Attach another File</a></div> <input type="submit" id="btnSubmit" /> </div> </form>
Javascript:
var upload_number = 2;function addFileInput() { try { var fileUpload = document.getElementById("attachment"); var elemSpan = nextElement(fileUpload).cloneNode(true); var elemDiv = document.getElementById("moreUploads"); var d = document.createElement("div"); var file = document.createElement("input"); file.setAttribute("type", "file"); file.setAttribute("id", "attachment" + upload_number); file.setAttribute("onchange", "validate(this)"); d.appendChild(file); d.appendChild(elemSpan); elemDiv.appendChild(d); upload_number++; } catch (err) { alert(err);}}
the validate(this) is a function that validates file types on client.When validation succeeds then the link to add more file inputs is enabled. Could someone throw somelight on this.
I have put the following method in my master page. It works when I call it on a full post back, but when I call it from a updatePanel's asyncPostBack no alert is shown.
I have four textbox and a button in my page. After filling the textbox. When the user click save button. A loading image should be displayed. User should not feel that the page is postback to the server,Some thing like in facebook loading image.
Being new to ASP.NET I have run into trouble building my own Whack-a-mole program. I think my problem comes from using Buttons, which by themselves send post backs to the server, making the software unusable. The looks are in place, making new buttons show up in the grid, in different places by random. However, when a button is pushed - the score doesn't change (which I feel is strange).
Not so strange is that the Button doesn't work since it sends post back to the server - reloading the UpdatePanel. I think I should use a different controller like the CheckBox and style it hard using CSS (which isn't a problem). Is this the correct way to go, or should I make use of JavaScript AJAX instead?
Note to self: This technique shouldn't be used in a public application since it put too much unwanted pressure on the web server.
I searched google and found asynchronise post back trigger is used if we want update panel to post back on some event of control if it is out side the update panel. Than what is purpose of post back trigger ?
I'm populating a generic list from an excel file that contains names of pdf files. Now I want to take each item in the list and create a file from it. Here's what I have so far:
[Code]....
So now, the list called lines contains names of 900 pdf files. How would I take those names out of the list and create files from them?
I have a very odd and disconcerning problem. Just recently a page where I have 1 textbox and a buttoon has ceased to work.
When I look at the post coming into the PageLoad, the pageType is "POST", but the Page.IsPostBack is false!! and the textbox (which had content) is empty.
I have stripped all AJAX script out, so I have a very vanilla page (in a master page) being served.
The pages is
[Code].... [Code]....
The page is "POST", but isPostback is false[Code]....
I have an ASPX page that I am using to write JSON. It works great in Firefox and Chrome, but when I try and use it in IE 8 it gives me an "The XML page cannot be displayed" error instead of allowing jQuery to load the JSON being written by the response. Here is what my code looks like:
I'm currently using an SqlDataSource in ASP.NET/C# to let users insert, delete and update entries in a table/gridview. Every event needs to be written to an audit table.
I have easily implemented inserting and deleting - when inserting, the main info audited is just the parameter values of the insert query (e.Command.Parameters[0].Value.ToString() etc), and deleting is pretty much the same (just getting the ID in the delete query).
But with updating, I need to log which fields were changed and also their old values. How would I do this? As an example, here is the code for the inserting:
I know that you can enable NTLM authentication in an ASP.Net app using:
<authentication mode="Windows" />
However - I need to handle Forms, HTTP and other custom authentications in the same app, so ASP.Net's limited built-in support is no use.
The NTLM handshake should be fairly simple:
Request - [unauthenticated - no user info passed] Response - 401 Unauthorized WWW-Authenticate: NTLM Request - Authorization: NTLM <base64-encoded type-1-message>
[code]...
I need to parse type-1 and type-3 messages and generate a type-2 message.
The structure for those messages is well documented but fairly complex - it seems very messy to write my own message generators and parsers. I think the methods to read and write these messages should already be in .Net, but I haven't been able to find them.
I have a web page (Provider) that creates an XML file to be send to the Requester in this fashion:
1. A Requester page needs to send an XML file to the provider page 2. Provider will read the XML file to authenticate the request 3. Provider will Create an xml file with some data. 4. Provider will send the xml file back to the Requester.
Can anyone provide sample code for both the Requestor page (step 1) and the Provider page (steps 2 & 3)
I have a static method that I use to control REST styled HTTP codes when my mvc application encounters an exception.
The method looks like:
[Code]....
This is static becuase then I can call it within an action or inside a filter. The problem I am having is that when I call RaiseException inside a filter, it stills goes into the requested action. Response.End() doesn't seem to have any effect. Any clues on how I can get Response.End() to work when called?
Sys.Webforms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled. Details: Error parsing near ' i have kept button in updatepanel and i am getting this error
I've created 2 web user controls. A = User control that displays an image, and B is the user control that hosts A. I'm trying to stream an array of bytes to A, but it seems like the Response.BinaryWrite method completely overwrites any heirachial controls (I can't see any of B's other controls besides the image).
How do I get A to just display the image from the byte stream? It doesn't come from a database, it's an image I created on the fly.
i'm using stream writer to write a text file on client machine, but everytime while i'm writing a new file it over writes the existing one..so now i need to write seperate file each time ...and also i need to create a folder dynamically for first time and save text files in that folder when everytime i use my application....
I have write small web-service that recieves query and read txt file for matching. For it I'm using StreamReader.
I'm not waiting that it will be thousands of users in hour for this service, but whats worried me - if some users at the same time will be use that service is it ok? Can text file on server side be readed at same time from some users?
What is capacity for using StreamReader or StreamWriter on server?
I am having difficulty using C in the VS IDE. No matter what I write the code always has errors and I am not able to see the end result. I don't understand VS and being that I am supposed to be taking Programming in C as a class, it is hard for me to get my work done because I don't understand VS and I really don't know how to match the two up.
i am trying to work up with captcha in my sign up page.Having a google search,i found a .dll which i implemented in my project and it worked fine.Now i want to know that is it a good idea to download the dll files and use it in the project instead of writing the whole code from the scratch?What are the disadvantages of using a dll instead of writing up the entire code form the scratch?
I am creating an site where a user uploads an excel file to check if any of the records exist in a database. Then they are returned an excel file with only the records that are NOT in the database. I was thinking I should do it this way1. User uploads their excel file. The app opens excel file and loads records into a dataset (so far this is working with the code below)2. Using datarow and another function to check if each excel record exists in the database3 If the record does NOT exist, and it is the first record tested, create an excel file called records.xlsx and write the record into the file
4. Check the next record and if it does NOT exist in the database, then check if records.xlsx already exists then open it and write it into it.
[Code]....
Hopefully its clear, sorry if its not, I'm a bit of a novice at this. Is this a good way to do it? Does anyone know of any tutorials that might outline how to open an existing file and write to it?
