[web2py] Re: Empty HTML input array issue
You've given the same name to three fields ('item[]'). web2py treats that as
one field, so it puts all the values submitted in those fields into a single
list to represent the value of the field. When an error is returned, web2py
populates the form with the previously submitted values, so it is populating
each of the item[] fields with the list of values submitted. Since there are
three fields, it should actually be ['','',''] (the empty quotes would be
replaced with actual values if any items were submitted with the form).
Is the 'items[]' field a list:string field? Why does the name have '[]' at
the end of it? What does your DB model look like?
Anthony
On Wednesday, September 28, 2011 1:18:35 AM UTC-4, Joseph Jude wrote:
Hi all,
I have the below form (leaving out non-essential code)
form = FORM(
DIV(
UL(
SPAN(LABEL('Name:')),
SPAN(INPUT(_type=text, _name=name, requires=IS_NOT_EMPTY(,
DIV(
LABEL(Items:),
UL(
SPAN(INPUT(_type=text, _name=items[])),
SPAN(INPUT(_type=text, _name=items[])),
SPAN(INPUT(_type=text, _name=items[]))
))
DIV(
INPUT(_type=submit, _value=Create My List),
_class=submitbtn button)
))
if form.accepts(request.vars, session):
rest of code
If this form is submitted with values the form values are written into the
databases. No problem. However, if it is submitted with an empty first field
(name), the the fields _name=items[] are filled with values ['', ''] when
errors are flashed on the screen. I am not able to find why it happens and
also how to fix it. (there is a reason why I use the _name=items[] - user
should be able to add as many items as possible at the client side). Any
clues and solution is appreciated. Thank you.
Joseph
[web2py] Re: Empty HTML input array issue
Thanks Anthony for the reply.
1) With your answer, I understand why the ['',''] is displayed. But is there
a way to change it?
2) [] is appended since I wanted an array. But in the mean-while I
experimented without [] and just having 'items' as the variable name for all
the three fields and got the same behavior (your explanation tells me why).
3) I want the user to add as many fields as needed. Think of list of to-do
items for a single topic.
4) the db model is not a list:string. it is a regular table:
db.define_table('checklist_items',
Field('checklist_id', db.checklists),
Field('item_name')
)
5) there is only one field in the form which is mandatory; others (about 5
other fields) are not. so I can't use keepvalues=false
Hope to hear.
Thanks again,
Joseph
[web2py] Re: Empty HTML input array issue
That's tricky. You might get ideas from
this: https://groups.google.com/d/topic/web2py/UK8NZ1VMlNk/discussion. Maybe
others have suggestions.
Anthony
On Wednesday, September 28, 2011 9:48:16 AM UTC-4, Joseph Jude wrote:
Thanks Anthony for the reply.
1) With your answer, I understand why the ['',''] is displayed. But is
there a way to change it?
2) [] is appended since I wanted an array. But in the mean-while I
experimented without [] and just having 'items' as the variable name for all
the three fields and got the same behavior (your explanation tells me why).
3) I want the user to add as many fields as needed. Think of list of to-do
items for a single topic.
4) the db model is not a list:string. it is a regular table:
db.define_table('checklist_items',
Field('checklist_id', db.checklists),
Field('item_name')
)
5) there is only one field in the form which is mandatory; others (about 5
other fields) are not. so I can't use keepvalues=false
Hope to hear.
Thanks again,
Joseph
