Resolve "Add JSON example for annotations in file upload form"

Closes #122 (closed)

portal/forms.py

@@ -218,7 +218,8 @@ class DataFileServletUploadForm(forms.ModelForm):
 
 class DataFileAnnotationForm(forms.Form):
     dropzone_files = forms.CharField(required=False, widget=forms.HiddenInput)
-    annotations = HStoreField(required=False, label=_('Attach these annotations with the uploaded files:'), help_text=_('Pro Tip: You can also drop a tab separated value file onto this field'))
+    annotations = HStoreField(required=False, label=_('Attach these annotations with the uploaded files:'), help_text=_('Pro Tip: You can also drop a tab separated value file onto this field'),
+                              widget=forms.Textarea(attrs={'placeholder':'{"key": "value"}'}))
     lab = forms.ChoiceField(required=False, label=_('Attach uploaded files to this lab:'))
 
     def __init__(self, request, *args, **kwargs):