Using a python list in a Check Box Selection Form in Flask WTF

Question

I want to use a python list as the options for a check box selection form. So you can select the items in the list that you want and submit the form to use those values.

Which form field do I use in my form?

What would my html file look like?

I think the .html page should look like this.

    <form>
        {% for item in list %}
            <input type="checkbox" name="modList" value={{item}}>{{item}}<br>
        {% endfor %}
    </form>

But I can't figure out what to make the form field in forms.py.

http://packages.python.org/Flask-WTF/

There is no Checkbox form on that page.

I can use

    {{form.modList(formdata = list)}}

But it just displays an emtpy checkbox with no text

it would help if you told us what you have tried

Inbar Rose
– Inbar Rose

2013-01-29 15:23:35 +00:00
Commented Jan 29, 2013 at 15:23 — Inbar Rose
– Inbar Rose, Commented Jan 29, 2013 at 15:23

Lyndsy Simon · Accepted Answer · 2013-01-29 22:18:16Z

2

I'm not sure why you'd want to do this. If you're using checkboxes, I assume you'll want to return the value of each one. If so, then each one should be a distinct property of the WTForm instance you're using.

If you're only wanting to return the values checked, WTForms offers the wtforms.fields.SelectMultipleField. That would print a dropbox wherein the user could select 0, 1 or more options.

If you must have checkboxes, and you must use a list in the form definition, then it seems your only option is to create a custom field. You can find documentation on how to do that here.

In fact - this use case is the example in the Custom Widget portion of the WTForms documentation.

answered Jan 29, 2013 at 22:18

Lyndsy Simon

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3 Comments

art-solopov Over a year ago

The case I have is this: an object has multiple files attached to it. I want a render a form which will let users mark the files they want to delete.

Lyndsy Simon Over a year ago

it's been at least two years since I touched WTForms - but if you're using a list in the form definition, as far as I know the only way to do that would be to create a custom widget. It shouldn't be terribly hard to do.

art-solopov Over a year ago

I haven't really groked the process, but I'll try.

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