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Ajax download file

I need to be able to generate an excel file containing data from a subset of that form. The tricky bit is that this shouldn't affect the rest of the form and so I want to do it via AJAX. I've come across a few questions on SO that seem to be related, but I can't quite work out what the answers mean. This one seems the closest to what I'm after: asp-net-mvc-downloading-excel - but I'm not sure I understand the response, and it is a couple years old now. I also came across another article (can't find it anymore) about using an iframe to handle the file download, but I'm not sure how to get this working with MVC. My excel file returns fine if I'm doing a full post back but I can't get it working with AJAX in mvc. You can't directly return a file for download via an AJAX call so, an alternative approach is to to use an AJAX call to post the related data to your server. You can then use server side code to create the Excel File (I would recommend using EPPlus or NPOI for this although it sounds as if you have this part working). My original answer (below) was over 3 years old, so I thought I would update as I no longer create files on the server when downloading files via AJAX however, I have left the original answer as it may be of some use still depending on your specific requirements. A common scenario in my MVC applications is reporting via a web page that has some user configured report parameters (Date Ranges, Filters etc.). When the user has specified the parameters they post them to the server, the report is generated (say for example an Excel file as output) and then I store the resulting file as a byte array in the One other change that could easily be accommodated if required is to pass the MIME Type of the file as a third parameter so that the one Controller action could correctly serve a variety of output file formats. This removes any need for any physical files to created and stored on the server, so no housekeeping routines required and once again this is seamless to the end user. Note, the advantage of using You can't directly return a file for download via an AJAX call so, an alternative approach is to to use an AJAX call to post the related data to your server. You can then use server side code to create the Excel File (I would recommend using EPPlus or NPOI for this although it sounds as if you have this part working). Once the file has been created on the server pass back the path to the file (or just the filename) as the return value to your AJAX call and then set the Java Script to this URL which will prompt the browser to download the file. From the end users perspective, the file download operation is seamless as they never leave the page on which the request originates. Below is a simple contrived example of an ajax call to achieve this: My 2 cents - you don't need to store the excel as a physical file on the server - instead, store it in the (Session) Cache. Use a uniquely generated name for your Cache variable (that stores that excel file) - this will be the return of your (initial) ajax call. This way you don't have to deal with file access issues, managing (deleting) the files when not needed, etc. and, having the file in the Cache, is faster to retrieve it. I was recently able to accomplish this in MVC (although there was no need to use AJAX) without creating a physical file and thought I'd share my code: Super simple Java Script function (button click triggers this): In the Export Helper class I do use a 3rd party tool (Gem Box. Spreadsheet) to generate the Excel file and it has a Save to Stream option. That being said, there are a number of ways to create Excel files that can easily be written to a memory stream. I used the solution posted by CSL but I would recommend you dont store the file data in Session during the whole session. By using Temp Data the file data is automatically removed after the next request (which is the GET request for the file). You could also manage removal of the file data in Session in download action. Session could consume much memory/space depending on Session State storage and how many files are exported during the session and if you have many users. I've updated the serer side code from CSL to use Temp Data instead. The accepted answer didn't quite work for me as I got a 502 Bad Gateway result from the ajax call even though everything seemed to be returning fine from the controller. Perhaps I was hitting a limit with Temp Data - not sure, but I found that if I used IMemory Cache instead of Temp Data, it worked fine, so here is my adapted version of the code in the accepted answer: This thread helped me create my own solution that I will share here. I was using a GET ajax request at first without issues but it got to a point where the request URL length was exceeded so I had to swith to a POST. The javascript uses JQuery file download plugin and consists of 2 succeeding calls. Net Web Form and just I wanna to download a file from server side. I have to create a lot of input button dynamically on runtime. One POST (To send params) and one GET to retreive the file. Just **posting** this bit of data from the complete View... There is a lot article but I cannot find just basic answer. And I want to add each button to download button with giving an unique file Number. //Here, you are not posting the full Form.the complete View @using (Html. I create each button like this: I am generating this Form_1, Form_2, Form_3.... And I am going to delete this old files with another program. But if there is a way to just sending byte array to download file like using Response. I need to be able to generate an excel file containing data from a subset of that form. The tricky bit is that this shouldn't affect the rest of the form and so I want to do it via AJAX. I've come across a few questions on SO that seem to be related, but I can't quite work out what the answers mean. This one seems the closest to what I'm after: asp-net-mvc-downloading-excel - but I'm not sure I understand the response, and it is a couple years old now. I also came across another article (can't find it anymore) about using an iframe to handle the file download, but I'm not sure how to get this working with MVC. My excel file returns fine if I'm doing a full post back but I can't get it working with AJAX in mvc. You can't directly return a file for download via an AJAX call so, an alternative approach is to to use an AJAX call to post the related data to your server. You can then use server side code to create the Excel File (I would recommend using EPPlus or NPOI for this although it sounds as if you have this part working). My original answer (below) was over 3 years old, so I thought I would update as I no longer create files on the server when downloading files via AJAX however, I have left the original answer as it may be of some use still depending on your specific requirements. A common scenario in my MVC applications is reporting via a web page that has some user configured report parameters (Date Ranges, Filters etc.). When the user has specified the parameters they post them to the server, the report is generated (say for example an Excel file as output) and then I store the resulting file as a byte array in the One other change that could easily be accommodated if required is to pass the MIME Type of the file as a third parameter so that the one Controller action could correctly serve a variety of output file formats. This removes any need for any physical files to created and stored on the server, so no housekeeping routines required and once again this is seamless to the end user. Note, the advantage of using You can't directly return a file for download via an AJAX call so, an alternative approach is to to use an AJAX call to post the related data to your server. You can then use server side code to create the Excel File (I would recommend using EPPlus or NPOI for this although it sounds as if you have this part working). Once the file has been created on the server pass back the path to the file (or just the filename) as the return value to your AJAX call and then set the Java Script to this URL which will prompt the browser to download the file. From the end users perspective, the file download operation is seamless as they never leave the page on which the request originates. Below is a simple contrived example of an ajax call to achieve this: My 2 cents - you don't need to store the excel as a physical file on the server - instead, store it in the (Session) Cache. Use a uniquely generated name for your Cache variable (that stores that excel file) - this will be the return of your (initial) ajax call. This way you don't have to deal with file access issues, managing (deleting) the files when not needed, etc. and, having the file in the Cache, is faster to retrieve it. I was recently able to accomplish this in MVC (although there was no need to use AJAX) without creating a physical file and thought I'd share my code: Super simple Java Script function (button click triggers this): In the Export Helper class I do use a 3rd party tool (Gem Box. Spreadsheet) to generate the Excel file and it has a Save to Stream option. That being said, there are a number of ways to create Excel files that can easily be written to a memory stream. I used the solution posted by CSL but I would recommend you dont store the file data in Session during the whole session. By using Temp Data the file data is automatically removed after the next request (which is the GET request for the file). You could also manage removal of the file data in Session in download action. Session could consume much memory/space depending on Session State storage and how many files are exported during the session and if you have many users. I've updated the serer side code from CSL to use Temp Data instead. The accepted answer didn't quite work for me as I got a 502 Bad Gateway result from the ajax call even though everything seemed to be returning fine from the controller. Perhaps I was hitting a limit with Temp Data - not sure, but I found that if I used IMemory Cache instead of Temp Data, it worked fine, so here is my adapted version of the code in the accepted answer: This thread helped me create my own solution that I will share here. I was using a GET ajax request at first without issues but it got to a point where the request URL length was exceeded so I had to swith to a POST. The javascript uses JQuery file download plugin and consists of 2 succeeding calls. Net Web Form and just I wanna to download a file from server side. I have to create a lot of input button dynamically on runtime. One POST (To send params) and one GET to retreive the file. Just **posting** this bit of data from the complete View... There is a lot article but I cannot find just basic answer. And I want to add each button to download button with giving an unique file Number. //Here, you are not posting the full Form.the complete View @using (Html. I create each button like this: I am generating this Form_1, Form_2, Form_3.... And I am going to delete this old files with another program. But if there is a way to just sending byte array to download file like using Response.

date: 25-Aug-2021 22:01next


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