Develop Reference

Load data based on user inputs

I am working with dynamic data that requires an ID and a year to load, both of which are input by the user. The ID is unique, so two users will very likely be looking at different data. They are passed into a URL that returns a large dictionary. This dictionary is then passed to a bunch of other functions for various analyses and visuals. I was thinking of displaying the data in its own hidden route and have other routes call on it (I am new to flask, so there could be a better/more efficient way of storing and accessing dynamic data like this).
Here is the flask code to display the form and where I try to access the data:
#app.route("/")
def home():
return render_template("index.html")
#app.route("/data/<lid>/<ssn>", methods=["GET","POST"])
def data_league():
if request.method == "POST":
league_id = request.form["lid"]
season = request.form["ssn"]
url = 'http://fantasy.espn.com/apis/v3/games/ffl/seasons/' + season + '/segments/0/leagues/' + league_id + '?view=mMatchupScore&view=mTeam&view=mSettings'
r = requests.get(url,
params={'view':'mMatchup'})
d = r.json()
return d
And the HTML code that creates the form:
<form class="row row-cols-lg-auto g-3 align-items-center" action="#" method="post" style="margin-
left: 180px;">
<div class="col-5">
<label class="visually-hidden" for="league_id">Username</label>
<div class="input-group">
<input type="text" class="form-control" name="lid" id="lId" placeholder="League ID">
</div>
</div>
<div class="col-5">
<label class="visually-hidden" for="season">Preference</label>
<select class="form-select" name="ssn" id="Ssn">
<option selected>Select a Season</option>
<option value="1">2020</option>
<option value="2">2019</option>
<option value="3">2018</option>
</select>
</div>
<div class="col-12">
<button type="submit" class="btn btn-primary">Submit</button>
</div>
</form>
When I run the app and input an ID and year, I get a TypeError saying that "data_league() got an unexpected keyword argument 'lid'". What am I doing wrong?

Datalist in HTML form read all values with python

Is there a method to read all the values of a datalist with python?
<form action="/cgi-bin/file.py" method="post">
<div>
<label for="name">
Name
</label>
<input type="text" name="name" list="namelist" id="name">
<datalist id="namelist">
<option value="1">
<option value="2">
<option value="3">
<option value="4">
</datalist>
</div>
with python i am able to read the selected value through the command
import cgi
form = cgi.FieldStorage()
name=form.getvalue("name")
but is there a way to put all the values in a list? ['1','2','3','4']
Thanks

Not unless you can read the original page. The browser isn't sending you all possible values.

liist=[]
with open("filename",'r') as m:
for x in m:
if "value" in x:
final=x[19:20]
liist+=final
print(liist)

Python/Django pass user input as keyword arguments?

I am trying to pass what ever the user inputs into the url as keyword arguments (even if its not a real entry). When I try to assign the input name as the keyword arguments it fails.
HTML:
<p class="search">
<form method="GET" action="{% url 'job' %}" class="sidebar-form">
<div class="ogsearchbar input-group">
<input class="searchbarz" type="text" name="user_input" id="user_input" placeholder="Enter Job Number" autocomplete="off" />
<span class="input-group-btn">
<button type="submit" name="search" id="search-btn" class="btn btn-flat"><i class="fa fa-search"></i></button>
</span>
</div>
</form>
</p>
Django:
def get_job(request):
if request.method == 'GET':
formvar = request.GET['user_input']
return HttpResponseRedirect('/jobs/' + formvar)

What you want doesn't make sense. The {{ }} signs denote a context variable which is passed into the template from the server, before the template is rendered. But you're trying to use a value which is only defined when the user actually types something into the rendered page itself.
You could probably do this with some Javascript, but there doesn't seem to be much point. Drop the parameter from the URL and let the form send it in the query params, which you can access in your view as request.GET.

I decided to just go with javascript since my django code was not working with a request method when refreshing the page.

400 Bad Request Error on POST request with Flask

I am attempting to return data from a HTML form with a POST request using Flask. For some reason I get a 400 Bad Request error. Looking at Chrome Dev Tools, I can see that all of the form fields with the input tag are part of the post request. The select tag with the dropwdown list is not being captured and I think this is creating the error. Anyone know why the select tag is not being captured in the post request? Any help much appreciated.
Here is the HTML form:
<label for="vendor">Select Vendor</label>
<div class="flextable p-b" style="padd">
<div class="flextable-item">
<select class="selectpicker" data-live-search="true" form="addInvoice" name="vendor" id="vendor">
<option>Jack Jaffa & Associates</option>
<option>Jacobs/Doland/Beer LLC</option>
<option>Jenkins & Huntington Inc.</option>
<option>Joseph J. Blake & Associates, Inc.</option>
<option>Langan (Geotechnical)</option>
<option>Madison Realty Capital</option>
<option>McNamara Salvia, Inc</option>
<option>Metropolis Group, Inc</option>
<option>National Grid</option>
</select>
</div>
<div class="flextable-item">
<button type="button" class="btn btn-xs btn-primary-outline">Add vendor</button>
</div>
<label for="invoice_number">Invoice Number:</label>
<input type="text" class="form-control p-b" placeholder="Every vendor invoice # must be unique" name="invoice_number" id="invoice_number">
<label for="invoice_amount">Amount:</label>
<input type="text" class="form-control p-b" placeholder="$0.00" name="invoice_amount" id="invoice_amount">
<label for="invoice_amount">Description:</label>
<input type="text" class="form-control p-b" placeholder="$0.00" width="100%" name="description" id="description">
<div class="spacer"></div>
<div class="flextable">
<div class="flextable-item">
<label for="date_received">Date received:</label>
</div>
<div>
<div class="flextable-item">
<div class="input-group">
<span class="input-group-addon">
<span class="icon icon-calendar"></span>
</span>
<input type="text" value="01/01/2015" class="form-control" data-provide="datepicker" style="width: 200px;" name="date_received" id="date_received">
</div>
</div>
</div>
</div>
</div>
<div class="modal-actions p-t-lg">
<button type="button" class="btn-link modal-action" data-dismiss="modal">Cancel</button>
<button type="submit" class="btn-link modal-action" id="submit" >
<strong>Save + Continue</strong>
</button>
</div>
</form>
Here is the Flask python route:
#app.route('/add_invoice', methods=['GET', 'POST'])
def add_invoice():
""" Method for capturing form data to add invoice items to database"""
if request.method == 'POST':
find_cost_code = 7777 # eventually need code to lookup cost-code from POST request
print request.form['invoice_number']
print request.form['invoice_amount']
print request.form['description']
print request.form['vendor']
print request.form['date_received']
return "This is a test"
ADDED INFO:
So if I remove this line, the bad request error goes away:
print request.form['vendor']
This is because the "vendor" field is the only one in the html form that uses a select tag for input and that data is not catpured in the post request dictionary (which i can see in Chrome Dev Tool). The POST request is missing the field associated with the select tag. Not sure how to capture the select tag in the form data...

I've faced this issue many time when dealing with flask form, I think the solution is to enable csrf token protection :
according to this you need to initialise and enable it for you app!
Most of time error 400 is due to missing CSRF token.
you can do it as :
from flask_wtf.csrf import CSRFProtect
csrf = CSRFProtect(app)
for initialisation
and in your form add:
<input type="hidden" name="csrf_token" value="{{ csrf_token() }}"/>
hope it will help!!
feel free to edit.

form="addInvoice"
This attribute as part of my HTML form markup was what caused the error. I'm not sure exactly why but when it is removed, the error goes away.
(Thanks for your help above in trying to look into this.)

You need getlist to capture select.

How do I determine the value of a dropdown?

This is the Html form:
<form action='use.py'>
<div><input type='text' name='etc'></div>
<p><input type='submit' value='etc!'></p>
</form>
And this is the python for it
colour = form["colour"].value
The top html form is a text box that users can type something in.
If I were to have a drop down box / radio button form like this:
<form action='etc.py'>
<p>List Type:</p>
<div><input type='radio' name='status' value='bulleted' checked>
Bulleted
</div>
<div><input type='radio' name='status' value='numbered'>
Numbered
</div>
<p>Text style:</p>
<div><input type='checkbox' name='bold'>
<b>Bold</b>
</div>
<div><input type='checkbox' name='italic'>
<i>Italic</i>
</div>
<p>Movies to display:</p>
<div>
<select name='type'>
<option>Only numbers</option>
<option>Only names</option>
</select>
</div>
<p><input type='submit' value='Display'></p>
</form>
How would I write my python? Like this?
only_numbers = form["Only numbers"].value

You can write a Python CGI script, but most Python frameworks are built upon WSGI and have a concept of request/response objects. For example, in Django the value would be available at request.POST['fieldname'].
Using the python CGI module, it is like:
form = cgi.FieldStorage()
# for multiple elements with same name or elements with multiple values
a_list = form.getlist("multiple_select_input")
# For single value elements
if "single_value_input" in form:
x = form["single_value_input"].value
else:
x = "default value"
# or
x = form.getvalue("single_value_input", "default value")