I'm two days in to Python and GAE, thanks in advance for the help.
I have an input array in HTML like this:
<input type="text" name="p_item[]">
<input type="text" name="p_item[]">
<input type="text" name="p_item[]">
I want to parse the input in Python, and I'm trying this, which isn't working:
items = self.request.get('p_item')
for n in range(1,len(items)):
self.response.out.write('Item '+n+': '+items[n])
What is the correct way to do this?
Change your html to this
<input type="text" name="p_item">
<input type="text" name="p_item">
<input type="text" name="p_item">
and use the self.request.get_all() method http://code.google.com/appengine/docs/python/tools/webapp/requestclass.html#Request_get_all
p.s. For reference, there is no concept of arrays for GET/POST data, your form gets transformed a key=value string separated by '&' e.g.
p_item=1&p_item=3&p_item=15
etc, it's up to the web framework to interpret whether a parameter is an array.
Edit: oops, just read the comments that you figured this out already, oh well :P
I would recommend doing some debugging if this sort of issue comes up. Make things simple and write out your variable values and ensure you get what you expect at each step. Do something like the following:
<form method="get">
<input type="text" name="single_key" />
<input type="text" name="array_key[some_key]" />
<input type="submit" />
</form>
And see what happens when running the following Python on the backend:
single_value = self.request.get('single_key')
self.response.out.write(str(single_value))
array_value = self.request.get('array_key')
self.response.out.write(str(array_value))
Based on the output you should have a better idea of what to get the desired results or how to add more detail to your question if you still don't understand a certain behavior.
Related
I'm working with django and I want to calculate something depending on what the user put on the selectboxes of my page, but I don't know how to connect that with my python code that calculates everything, please help :(
You can use a html form element like this with method post and action="path_of_your_python_file"
<form name="search" action="calculate.py" method="GET">
Search: <input type="checkbox" name="user_input">
<input type="submit" value="Submit">
</form>
Then in calculate.py
import cgi
form = cgi.FieldStorage()
searchterm = form.getvalue('user_input')
// Do your calculation here
I think that will help
Trying to build my own webmail client.
I get a template for the web part which look like this
<form name="input" action="test2.py" methog="get" class="form">
<input type="text" name="Username" placeholder="Username">
<input type="password" name="Pass" placeholder="Password">
<button type="submit" id="login-button">Login</button>
</form>
Would like to get the input on click on the button of Username && Pass via GET method to fill this bunch of code in python.
user = ???(Username)
pass = ???(Pass)
And print to a new empty html file the value of thoses var.
New to python so everything I try seem to fail.
You should use method="post", it won't work with a GET method (however it is misspelled, you wrote "methog").
Write import request without quotes at the top of your python file.
Now use request.inputForm['name'] without quotes to access form elements where name is the element name.
I am passing multiple form fields which are optional, but which need to be associated with a user. Python's cgi.FormDict and cgi.FieldStorage both eliminate blank entries, so items get shifted "up" and associated with the wrong user.
This problem most often shows up with checkboxes (which I have), but I also have text fields.
Simplified form code:
<input type="text" name="user" />
<input type="text" name="email" />
<input type="text" name="phone" />
<input type="checkbox" value="MailingList1" />
<input type="checkbox" value="MailingList2" />
<p>
<input type="text" name="user" />
<input type="text" name="email" />
<input type="text" name="phone" />
<input type="checkbox" value="MailingList1" />
<input type="checkbox" value="MailingList2" />
etc...
Users are required enter EITHER email or phone (or both) but can leave the other blank.
Now say I have input like this:
john_doe john_doe#example.com (123) 555-1234 Y Y
jane_roe jane_roe#example.com Y
george_jetson george_jetson#future.com (321) 555-4321 Y
The FormDict looks something like this:
{
'username':['john_doe','jane_roe','george_jetson'],
'email':['john_doe#example.com','jane_roe#example.com','george_jetson#future.com'],
'phone':['(123) 555-1234','(321) 555-4321'],
'MailingList1':['Y','Y'],
'MailingList2':['Y','Y']
}
I'm looping through like this:
for i in range(len(myFormDict['username'])):
username = myFormDict['username'][i]
email = myFormDict['email'][i]
phone = myFormDict['phone'][i]
MailingList1 = myFormDict['MailingList1'][i]
MailingList2 = myFormDict['MailingList2'][i]
...Inserts into the database
Before you ask, Yes, I do have error traps to prevent it from running off the end of the lists and all. The code works fine, but my database ends up looking like this:
john_doe john_doe#example.com (123) 555-1234 Y Y
jane_roe jane_roe#example.com (321) 555-4321 Y Y
george_jetson george_jetson#future.com
Jane and George are going to be pretty mad at me.
So... how do I keep the blanks so the right phone numbers and list memberships line up with the right users?
All the answers I've found searching the web involve a framework like GAE, Django, Tornado, Bottle, etc.
Bottle is lightest weight, but I tried it and it requires Python 2.5 and I'm stuck on 2.4.
If these frameworks can do it, it has to be possible. So how can I manage my data properly with just the standard library?
Thanks.
Look at the doc below (namely, keep_blank_values parameter):
>>> print cgi.FieldStorage.__init__.__doc__
Constructor. Read multipart/* until last part.
Arguments, all optional:
fp : file pointer; default: sys.stdin
(not used when the request method is GET)
headers : header dictionary-like object; default:
taken from environ as per CGI spec
outerboundary : terminating multipart boundary
(for internal use only)
environ : environment dictionary; default: os.environ
keep_blank_values: flag indicating whether blank values in
percent-encoded forms should be treated as blank strings.
A true value indicates that blanks should be retained as
blank strings. The default false value indicates that
blank values are to be ignored and treated as if they were
not included.
strict_parsing: flag indicating what to do with parsing errors.
If false (the default), errors are silently ignored.
If true, errors raise a ValueError exception.
I'm not sure if you can tweak cgi.FromDict to do what you want,
but maybe a solution would be to make every input set uniqe like so:
<input type="text" name="user" />
<input type="text" name="email" />
<input type="text" name="phone" />
<input type="checkbox" value="MailingList1_1" />
<input type="checkbox" value="MailingList2_1" />
<p>
<input type="text" name="user" />
<input type="text" name="email" />
<input type="text" name="phone" />
<input type="checkbox" value="MailingList1_2" />
<input type="checkbox" value="MailingList2_2" />
Note thate MailingList1 and Mailinglist2 now hafe a suffix for the "entry block".
You will have to add this at generation time of you Form and then adapt your processing accordingly by reading the checkboxes like so:
lv_key = 'MailingList1_' + str(i)
MailingList1 = myFormDict[lv_key]
...
Regards,
Martin
Even if you're using wsgi based frameworks like django or bottle, you're using same <input> names for each field - cgi formdict does not eliminate empty fields, there are no empty fields in the first place. you should give different name attribute for each user.
Is there any way for Pyramid to process HTML form input which looks like this:
<input type="text" name="someinput[]" value="" />
or even more usefully:
<input type="text" name="someinput[0][subelement1]" value="" />
<input type="text" name="someinput[0][subelement2]" value="" />
<input type="text" name="someinput[1][subelement1]" value="" />
<input type="text" name="someinput[1][subelement2]" value="" />
...and access that data easily (e.g. via a dict)?
Any help would be much appreciated!
EDIT: to make it clearer, what I need is the ability to have a form where a user can add as many 'instances' of a group of input elements, e.g. adding between 1 and n users, each containing a firstname, lastname, username (or something like that).
One solution would be to use peppercorn. Although it does not support the syntax you're looking for, it will let you send structured data to your Pyramid application through the use of forms. A more casual description exists too.
I ran up against a few problems with Pylons/Formencode today when it came to validating multiple checkboxes. As a bit of background I have something like this in my Mako template:
<input type="checkbox" name="Project" value="1">Project 1</input>
<input type="checkbox" name="Project" value="2">Project 2</input>
<input type="checkbox" name="Project" value="3">Project 3</input>
<input type="checkbox" name="Project" value="4">Project 4</input>
<input type="checkbox" name="Project" value="5">Project 5</input>
In my validation schema I had something like this (please forgive any errors - I don't have the exact code infront of me):
Project = formencode.foreach.ForEach(formencode.validators.Int())
I was expecting to get a list back of checked items (sounds reasonable, right?) but instead I got a list with a single item despite having all boxes checked. Am I doing this wrong or is what I want to get back even possible? I have written a hack around it with onclicks for each checkbox item that appends the checked item to an array which is then posted back in JSON format - this is ugly and a pain since I have to repopulate all the fields myself if validation fails.
Anyone have any ideas?
maybe using formencode.validators.Set:
>>> Set.to_python(None)
[]
>>> Set.to_python('this')
['this']
>>> Set.to_python(('this', 'that'))
['this', 'that']
>>> s = Set(use_set=True)
>>> s.to_python(None)
set([])
>>> s.to_python('this')
set(['this'])
>>> s.to_python(('this',))
set(['this'])
redrockettt,
Have you looked at the docstring to variabledecode? It suggests you use something like:
<input type="checkbox" name="Project-1" value="1">Project 1</input>
<input type="checkbox" name="Project-2" value="2">Project 2</input>
<input type="checkbox" name="Project-3" value="3">Project 3</input>
Check out the text in variabledecode.py, or pasted here.