WTForms-How to prepopulate a textarea field?

You can do it before rendering, something like:

form.content.data = 'please type content'

I'm new to WTForms though.

For textarea widgets, you set the default content with the default argument in your field constructors.

class YourForm(Form):    your_text_area = TextAreaField("TextArea", default="please add content")

Then when you render:

{{form.content()}}

WTForms will render the default text. I have not been able to find a way to specify default text for the text area at render time.

I recently had the same problem, I solved it like this:

{% set f = form.content.process_data("please type content") %}{{ form.content() }}

For a test, you can try run the follow snippet:

>>> import wtforms>>> import jinja2>>> from wtforms.fields import TextAreaField>>> class MyForm(wtforms.Form):...     content = TextAreaField("Text Area")... >>> t = jinja2.Template("""{% set f = form.content.process_data("please type content") %}...                     {{ form.content() }}""")>>> >>> t.render(form=MyForm())u'\n                    <textarea id="content" name="content">please type content</textarea>'