如何将值传递到我的 Flask Form

Question

我是 Flask 新手。我一直在查看各种教程，但我看到的唯一看起来应该有用的东西却没有。

我有一个表格 class:

class CreateKardForm(FlaskForm):
kardTitle = StringField('Title')
contentText = TextAreaField('Content', [InputRequired(message="You must fill in some text.")])
keywords = StringField('Keywords', [InputRequired(message="Please enter at least one keyword. Separate keywords with commas.")])
createDate = DateField('Creation Date')
modifiedDate = DateField('Last Modified Date')
submit = SubmitField('Save')

还有一个 html 文件：

<!DOCTYPE html>
<html lang="en">
{% extends "formbase.html" %}
{% block content %}
<div class="formwrapper>
    <h1>Create a New IdxKard</h1>
    <form action="" method="post" novalidate>
        {{ form.hidden_tag() }}
        ...
        <p>
            {{ form.createDate.label }}<br>
            {{ form.createDate }}
        </p>
        <p>
            {{ form.modifiedDate.label }}<br>
            {{ form.modifiedDate }}
        </p>
        <p>{{ form.submit() }}</p>
    </form>

</html>

{% endblock %}
</html>

还有一条路线：

@app.route('/createKard', methods=['GET', 'POST'])
def createKard():
    print('In createKard')
    creationDate = datetime.now()
    print('creationDate=', creationDate)
    form = forms.CreateKardForm()

    if form.validate_on_submit():
        print('In createKard in main')

        title = request.form['kardTitle']
        content = request.form['contentText']
        keywords = request.form['keywords']
        createDate = request.form['createDate']
        modifiedDate = request.form['modifiedDate']

        # do stuff

    return render_template('createKard.html', createDate=creationDate, form=form)

我希望 creationDate 在加载时显示在表单中，但它没有。我怀疑我仍然不清楚到底发生了什么。我认为因为用户还没有点击提交按钮，所以 return 和 render_template 应该显示 HTML 并传入 createDate。当用户点击提交时，validate_on_submit 为真，其余代码为运行。不过最重要的是，我如何将一个值传递到表单中以便显示它？

Answer 1

在将 CreateKardForm 的实例传递给 render_template 之前，您必须设置它的 createDate.data:

@app.route('/createKard', methods=['GET', 'POST'])
def createKard():
    print('In createKard')
    creationDate = datetime.now()
    print('creationDate=', creationDate)
    form = forms.CreateKardForm()
    form.createDate.data = creationDate  # pre-populate the form
    
    # ...

    return render_template('createKard.html', createDate=creationDate, form=form)

结果如下：

如何将值传递到我的 Flask Form

How can I pass a value into my Flask Form

python

flask

flask-wtforms