[Flask] Getting values of Flask-WTF SelectMultipleField?

[Alex Hall]

Thanks for the clarification. I used
print request.form.getlist("users")
but only got two empty lists (that is, []).

I'm selecting users logged in when packages were processed at the company
where I work. That is, which user did the processing for a given package. I
want people to be able to check any users they want to include, to see only
packages from those users. The function I have that queries the database
expects a list of users, each user as a string. My selection list is set up
this way, in my form class:

 usernames = ["u1", "u2", "u3", "u4"]
users = SelectMultipleField("Users", choices=[(u, u) for u in userNames])

Then, in my template:

<td>{{form.users(rows=6, multiple=True)}}</td>

In the function handling this form's input (technically an Ajax handler,
not a view, but it comes to the same thing):

@app.route("/orderLookup", methods=searchMethods)
def getOrderSearchResults():
 results = []
 print request.form.getlist("users")
 for result in
DBInterface.getOrderDetails(orderNumber=request.form["orderNumber"]):
  results.append({
   "name": result.user,
   "orderNumber": result.reference_3
  })
 return json.dumps(results)

Of course, I'll want to add the users list to the database lookup function
once I can figure out how to access said list. Hopefully that clarifies
things.

On Wed, Apr 20, 2016 at 2:21 PM, David Lord <davidism at gmail.com> wrote:

> And speaking of Flask-WTF, you should use that, as it handles multiple
> values and many other things for you.
>
>
> On 04/20/2016 11:20 AM, David Lord wrote:
>
> The same name is supplied multiple times with select multiple fields (and
> this can be done with other fields as well). Use
> request.form.getlist(name) to get all values for the given name.
>
> You found an example using Flask-WTF or just straight WTForms and
> conflated it with request.form when it was really referring to form as in
> “an instance of a Form“.
>
> On 04/20/2016 11:15 AM, Alex Hall wrote:
>
> Hello list,
> I've only been using Flask for a few days, but I'm really likeing it so
> far. My one question is how to deal with multiple select fields. I can get
> the value of standard inputs with
> request.form["fieldName"]
> but I can't figure out what to do about multiple select fields. I've
> googled the topic several different ways, but the only clear answer I found
> suggested using
> request.form.selectListName.data
> which doesn't do anything.
>
> I need to get the selected values as a list to pass to a database lookup
> function. For instance, the function expects ["v1", "v2", "v3"]. What's the
> trick to accessing the selected values of this kind of field? Thanks!
>
> --
> Alex Hall
> Automatic Distributors, IT department
> ahall at autodist.com
>
>
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-- 
Alex Hall
Automatic Distributors, IT department
ahall at autodist.com
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