asp mvc file upload (with validation)

Question

My model:

My controller:

Before submit (file is selected)

After submit (file is cleared)

As you can see my model (TestFileUploadModel) and my controller action (FileUpload)

-> 3th screen before i submit: file is selected -> 4th screen after i submit: name field is required, but file is cleared..

Anyone who was an idea how to solve this? (or a workaround?)

Validate client-side. On a round-trip to the server, the file cannot be preserved. — bzlm
– bzlm, Commented Sep 11, 2011 at 15:35

Community · Accepted Answer · 2017-05-23 12:30:36Z

1

As stated in the comment by user bzlm you can check with JQuery if the file has value and prevent the submit of the form.

You can attach a function at the submit of your form and do this check

if ($("#MyInputFileField").val()) { 
  //do your things
}
else
{
  //PreventDefault and show error message
}

EDIT: Look here for an answer that should be similar to your question

for an example using jquery validation plugin check this

edited May 23, 2017 at 12:30

CommunityBot

11 silver badge

answered Sep 11, 2011 at 15:44

Iridio

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4 Comments

bzlm Over a year ago

This is built into ASP.NET MVC. No need to re-invent the wheel. :)

Iridio Over a year ago

AFAIK the MVC doesn't validate the input type upload with an Html helper. At least not without the jquery.validation plugin.

Jordy Over a year ago

this looks exactly what i need! But do you have some code example? because i can't figure out how it works..

Iridio Over a year ago

In my update, the second link I posted, point to a demo with jquery validation. If you mean how to intercept the form post look here api.jquery.com/submit

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