Wtforms: How to generate blank value using select fields with dynamic choice values
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28-10-2019 - |
Question
I'm using Flask with WTForms (doc) on Google App Engine. What is the best way to generate an field with an empty value for a select field?
form.group_id.choices = [(g.key().id(), g.name) for g in Group.all().order('name')]
Is there something like "blank=True" for the form field?
myfield = wtf.SelectField()
Solution
Can you just prepend an empty pair to the list?
form.group_id.choices.insert(0, ('', ''))
OTHER TIPS
If it's a QuerySelectField
, you can add parameters like this:
allow_blank=True, blank_text=u'-- please choose --'
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