file form fix file field display on mode switch

This fixes a bug with the display of one of the file fields when
swapping to "computer" mode after having added an extra file form.

browser/js/database.js

@@ -634,10 +634,12 @@ Database.prototype = {
         var elem = $('.upload_field');
         var disable = !elem.prop('disabled');
         elem.prop('disabled', disable);
-        elem.closest("div").prop('hidden', disable);
         if (disable) {
+            elem.closest("div").hide();
             elem.val(undefined);
             $('.filename').val(undefined);
+        } else {
+            elem.closest("div").show();
         }
 
         var pre_process = $('#pre_process');

browser/js/form_builder.js

@@ -343,7 +343,7 @@ FileFormBuilder.prototype.build_file_field = function(id, hidden) {
     var d = this.build_wrapper();
     d.className += " file_" + id;
     if (this.source || hidden) {
-        d.hidden = true;
+        d.style.display = "none";
     }
     var i = this.build_input('upload_' + id, 'upload_field', 'file'+id, 'file', 'file');
     if (this.source) {

server/web2py/applications/vidjil/views/partial/file/form.html

@@ -60,7 +60,7 @@
         </div>
     </div>
     <div class="field_div">
-        <div id="file_field_1_{{=i}}" class="field_div file_1" {{if source_module_active:}} hidden {{pass}}>
+        <div id="file_field_1_{{=i}}" class="field_div file_1" {{if source_module_active:}} style="display: none" {{pass}}>
             <input class="upload_field form-control" id="file_upload_1_{{=i}}" type="file"
             {{if source_module_active:}}
                 disabled
@@ -69,7 +69,7 @@
                 title="(.fa, .fastq, .fa.gz, .fastq.gz, .clntab)"
             >
         </div>
-        <div id="file_2_{{=i}}" class="field_div file_2" hidden>
+        <div id="file_2_{{=i}}" class="field_div file_2" style="display: none">
             <input class="upload_field form-control" id="file_upload_2_{{=i}}" type="file"
             {{if source_module_active:}}
                 disabled