如何将数据（id）放入表单（wtforms）中并在提交时取回

Question

I am new to wtforms, so I`ll really appreciate any help. 我是wtforms的新手，所以我将非常感谢您的帮助。

I need to display books names and near each put "Delete" button. 我需要显示书籍名称，并在每个放置“删除”按钮的位置附近显示。 I`ve read wtforms crash course but I have no idea how to solve my problem with it. 我读过wtforms崩溃课程，但是我不知道如何解决它的问题。

So I decided to do it other way - my best idea is to render to template a dict with id and name and on submit return id, but I still can`t do it. 因此，我决定以其他方式进行操作-我最好的主意是将具有ID和名称的dict渲染为模板，并在提交返回ID时将其渲染为模板，但是我还是做不到。 Code examples are below. 代码示例如下。

It`s view.py 它的view.py

@application.route('/delete', methods=['GET', 'POST'])
def delete():
    books_lib = mydatabase.get_all_books()
    form = DeleteForm(request.form)
    if request.method == 'POST':
        delete_id = form.id.data
        mydatabase.del_book(delete_id)
        return render_template('delete.html', form = form, books_lib = books_lib)
    return render_template('delete.html', form = form, books_lib = books_lib)

It`s template 它的模板

<!DOCTYPE html>
<html>
<body>
    <h2>book to delete</h2>
<form action="/delete" name="delete" method="POST">
    {% if books_lib %}
        {% for id, book in books_lib.items() %}
            <p>{{book}}:<input type="submit" value="Delete" id="{{id}}">
        {% endfor%}
    {% endif %}
</form>
</body>
</html>

It`s form 它的形式

class DeleteForm(Form):
     book = TextField("Book name", [validators.Length(min=2, max=25)])
     id = HiddenField("id")

Answer 1

Here is how I do it. 这是我的方法。

TEMPLATE 模板

<p><a href="{{ url_for('delete_post', url=post.url) }}">delete</a></p>

View 视图

# delete a post
@app.route('/<path:url>/d')
@login_required
def delete_post(url):
    post = Post.get_post(url)
    if post is None:
        flash('post not found')
        return redirect(url_for('home'))
    db.session.delete(post)
    db.session.commit()
    Topic.update_counts()
    flash('Your post has been deleted')
    return redirect(url_for('index'))

the url_for is a Flask function that generates a url and binds it to a function. url_for是一个Flask函数，它生成一个url并将其绑定到一个函数。

Soooo.... in a nutshell. 太...简而言之。

template generates the delete path using the url_for function. 模板使用url_for函数生成删除路径。
the delete function is called when you visit the page. 当您访问页面时，将调用delete函数。
message flashes to template saying delete complete. 消息闪烁到模板，表示删除已完成。

to answer your original question.... 回答您的原始问题。

if you simply want to pass a list of ids to your template.... 如果您只想将ID列表传递给模板...。

First, create the display function. 首先，创建显示功能。

@app.route('/index')
def index():
    posts = Post.query.order_by(Post.pub_date.desc())  #SQLAlchemy query.
    return render_template('index.html', posts=posts) #sends all posts to template.

Now in your template you can generate a list of post.ids. 现在，您可以在模板中生成post.id列表。

    {% for post in posts %}
        {{post.id})
    {% endfor %}

to add a delete link next to each item in your list use url_for. 要在列表中的每个项目旁边添加删除链接，请使用url_for。

{% for post in posts %}    
<p>{{post.id}) <a href="{{ url_for('delete_post', id=post.id) }}">delete</a></p>
{% endfor %}

In this case I use post id instead of the post.url to identify the specific post I want to delete, so don't forget to modify your @app.route in your delete function. 在这种情况下，我使用post id而不是post.url来标识要删除的特定帖子，因此不要忘记在delete函数中修改@ app.route。

@app.route('/<int:id>/delete')

Notice this solution does not require a form. 请注意，此解决方案不需要表格。 You only need a form if your want to do bulk deletes with check boxes. 仅当您想要使用复选框进行批量删除时，才需要一个表单。

如何将数据（id）放入表单（wtforms）中并在提交时取回

问题描述

1 个解决方案

解决方案1
1 已采纳 2014-04-23 19:01:33

如何将数据（id）放入表单（wtforms）中并在提交时取回

问题描述

1 个解决方案

解决方案1 1 已采纳 2014-04-23 19:01:33

解决方案1
1 已采纳 2014-04-23 19:01:33