Get the value of a checkbox in Flask

Question

I want to get the value of a checkbox in Flask. I\'ve read a similar post and tried to use the output of request.form.getlist(\'match\') and since it\'s a list

Answer 1

I found 4 ways to do that: Just to summarize:

# first way
op1 = request.form.getlist('opcao1') # [u'Item 1'] []
op2 = request.form.getlist('opcao2') # [u'Item 2'] []
op3 = request.form.getlist('opcao3') # [u'Item 3'] []

# second
op1_checked = request.form.get("opcao1") != None
op2_checked = request.form.get("opcao2") != None
op3_checked = request.form.get("opcao3") != None

# third
if request.form.get("opcao3"):
    op1_checked = True

# fourth
op1_checked, op1_checked, op1_checked = False, False, False
if request.form.get("opcao1"):
    op1_checked = True
if request.form.get("opcao2"):
    op2_checked = True
if request.form.get("opcao3"):
    op3_checked = True

# last way that I found ..
op1_checked = "opcao1" in request.form
op2_checked = "opcao2" in request.form
op3_checked = "opcao3" in request.form

Answer 2

You don't need to use getlist, just get if there's only one input with the given name, although it shouldn't matter. What you've shown does work. Here's a simple runnable example:

from flask import Flask, request

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def index():
    if request.method == 'POST':
        print(request.form.getlist('hello'))

    return '''<form method="post">
<input type="checkbox" name="hello" value="world" checked>
<input type="checkbox" name="hello" value="davidism" checked>
<input type="submit">
</form>'''

app.run()

Submitting the form with both boxes checked prints ['world', 'davidism'] in the terminal. Note that the html form's method is post so that the data will be in request.form.

---

While there are some cases where knowing the actual value or list of values of an field is useful, it looks like all you care about is whether the box was checked. In this case, it's more common to give the checkbox a unique name and just check if it has any value at all.

<input type="checkbox" name="match-with-pairs"/>
<input type="checkbox" name="match-with-bears"/>

if request.form.get('match-with-pairs'):
    # match with pairs

if request.form.get('match-with-bears'):
    # match with bears (terrifying)