CODEWITHSUNDEEP
pythonflask
kj4ohh
kj4ohh

Reputation: 637

Access Multiselect Form Field in Flask

I have a multiselect in html file like this:

<select multiple id="mymultiselect" name="mymultiselect">         
        <option value="1">this</option>       
        <option value="2">that</option>       
        <option value="3">other thing</option>
</select>

When I access the mymultiselect field in flask/python via:

request.form['mymultiselect']

or by using the request.args.get function it only returns one selected item. I've learned that to get all the selected items I have to add [] to the name of the field, like so:

<select multiple id="mymultiselect" name="mymultiselect[]">       
        <option value="1">this</option>       
        <option value="2">that</option>       
        <option value="3">other thing</option>
</select>

I can see by viewing the post data in firebug that this is working, but I anytime I try to access this field in flask/python it comes back as null or None.

How do you access these multiselect form fields that have "[]" at the end of their name? I've tried appending "[]" to the field name in the python code as well but that does not seem to work.

Upvotes: 48

Views: 42070

Answers (4)

Brian Juarez
Brian Juarez

Reputation: 21

Example if you are using FlaskForm with SelectMultipleField:

Form:

options = SelectMultipleField("Choose your option", choices=["Option1", "Option2", "Option3"])

Python code to get the choosen option, if your select option2 for example:

choosen_option= form.options.data

The result will be ['Option2'], just add [0] to get the element inside of list

choosen_option= form.options.data[0]

the result will be

choosen_option = Option2

Upvotes: 1

Ramesh Ponnusamy
Ramesh Ponnusamy

Reputation: 1807

enter image description here> In sometimes, If you are using Ajax POST method then check the parameter name in network tab. Check the image attached that describes how to verify the parameter names.

In Flask view:

you can access the list responce based on parameter name.

request.form.getlist('mymultiselect[]')

or

request.form.getlist('mymultiselect')

Upvotes: 5

Litu
Litu

Reputation: 51

You can create a function to get values as dictionary

def __get_form_data(self, method='POST', compare_with=dict()):
    # Get form MiniFieldStorage items
    form = cgi.FieldStorage(fp=self.rfile, headers=self.headers, environ={ 'REQUEST_METHOD' : method })
    # Convert to dictionary
    return { key.rstrip('[]'):form.getlist(key) if key.endswith('[]') else form.getvalue(key) for key in form.keys() if compare_with.get(key)!=form.getvalue(key) }

Upvotes: 1

Martijn Pieters
Martijn Pieters

Reputation: 1123970

You want to use the getlist() function to get a list of values:

multiselect = request.form.getlist('mymultiselect')

You do not need to add [] to the name to make this work; in fact, the [] will not help, don't use it at all.

Upvotes: 96

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