在重定向时将文件附加到表单

Question

Im providing a file preview option, where the user attaches a file, and then clicks preview. Which uploads the file, and outputs a PHPExcel preview.

From that page, I want to include a button that says continue. Which will then proceed with the actual upload and database row creation.

However once I redirect to the preview page, I have no idea how to attach this file to my hidden form for resubmission.

I can attach all the old input values....like so... But how do I attach the file??? (using blade in laravel for templating)

/* These work and are correct*/
<input type="text" id="xlsColumnOrder" name="xlsColumnOrder" value="{{$input['xlsColumnOrder']}}"/>
<input type="text" name="researcher" value="{{$input['researcher']}}" />    
<input type="text" name="leadcity" value="{{$input['leadcity']}}" />
<input size="16" id="survey_date" name="survey_date" type="text" value="{{$input['survey_date']}}"  /> 
/* This doesnt attach anything to the file input
/*  Need to attach the previously uploaded file here for resubmission */                                 
<input class="file" id="csvfile" name="csvfile" type="file" value="{{$file['csvfile']['tmp_name']}}" />

Answer 1

You cannot automatically resend user files so I would do it this way:

• When user sends form if any file is provided you save file in some directory (you treat it as temporary) and save file name/names to session and show user preview of file
• When he clicks continue - you can do with other data whatever you want (for example save it to database or show as hidden in another form) and you still have uploaded filename in session so if you want you may even again show file preview
• When you want to finally save all user data you move user file/files to final directory (and possible rename it) and save all the data with file(s) name (probably in database).

As addition you should have some kind of cron that removes data from your temporary directory that very created for example more than 3 hours