问题
I'm using Flask and Jinja2 and I need to make an editable table with multiple rows.
This is what the table will look like:
And here's HTML for that:
<form action="/support/team-members-update" method="post">
<table>
<tbody><tr>
<th>Name</th>
<th>Id</th>
<th>Inbox Share</th>
</tr>
<tr>
<td>Ben</td><td>55555</td><td><input type="text" name="share_55555" value="0"></td></tr> <tr>
<td>Steve</td><td>66666</td><td><input type="text" name="share_66666" value="1"></td></tr> <tr>
<td>Harry</td><td>77777</td><td><input type="text" name="share_77777" value="1"></td></tr> <tr>
<td>Sally</td><td>88888</td><td><input type="text" name="share_88888" value="1"></td></tr></tbody></table>
<button type="submit">Send</button>
</form>
My current implementation is in Lua, where I'm hard coding a bunch of strings and connecting up the post data to native Lua types by hand (fun!). If I have to, I can process the form data by hand in Python as well, but I imagine there's probably a better solution out there.
I have explored WTForms a bit, but haven't had much luck getting it to work correctly.
I did find FieldList, but that seems to deal with a list of the same field, not multiple rows with the same exact fields.
I also found TableWidget, but the documentation is sparse and I can't figure out how to implement it to know if that would do what I'm looking to do.
回答1:
FieldList will work, you need to make a list of a FormField. Specify your FormField like so:
class MemberForm(Form):
name = StringField('name')
member_id = StringField('member_id')
inbox_share = IntegerField('inbox_share')
# etc.
class TeamForm(Form):
title = StringField('title')
teammembers = FieldList(FormField(MemberForm))
Then you can create the forms from your database in a view function like so:
@app.route('/support/team-members-update', methods=['GET','POST'])
def update_team_members():
teamform = TeamForm()
teamform.title.data = "My Team" # change the field's data
for member in DB.get('teammembers') # some database function to get a list of team members
member_form = MemberForm()
member_form.name = member.name # These fields don't use 'data'
member_form.member_id = member.id
member_form.inbox_share = member.share
teamform.teammembers.append_entry(member_form)
return render_template('edit-team.html', teamform = teamform)
And then in the template, you can iterate over each item in teammembers as you create your table rows:
<html>
<head>
<title>Edit Team Members</title>
</head>
<body>
<h1>Edit Team</h1>
<div>
<form action="" method="post" name="teamform">
{{ teamform.hidden_tag() }}
Team Title: {{ teamform.title }}<br>
<div>
<table>
<tr>
<th> Name </th>
<th> ID </th>
<th> Inbox Share </th>
</tr>
{% for member in teamform.teammembers %}
<tr>
<td>{{ member.name }}</td>
<td>{{ member.member_id }}</td>
<td>{{ member.inbox_share }}</td>
</tr>
{% endfor %}
</table>
</div>
<p><input type="submit" name="edit" value="Send"></p>
</form>
</div>
</body>
</html>
回答2:
I never was able to get WTForms to work quite how I wanted. I think it was a bit too heavy for my needs, so I ended up just using my own Jinja2 template to build the form and then used the formencode library to parse the post variables into a dict. This works well enough for me. (Thanks to this question for pointing me to the formencode library).
I'll give you a rough look at the various files I'm using and then explain the important parts at the bottom:
app.py:
from flask import Flask, render_template, request
from formencode import variabledecode
import pickledb
app = Flask(__name__)
DB = pickledb.load('data/data.db', False)
@app.route('/team-members', methods=['GET', 'POST'])
def team_members():
global DB
teammembers = DB.get('teammembers')
# teammembers looks like this, roughly:
# [{"id": 55555, "name": "Ben", "share": 0},
# {"id": 66666, "name": "Amy", "share": 1},
# {"id": 77777, "name": "Ted", "share": 1}]
if request.method == 'POST':
postvars = variabledecode.variable_decode(request.form, dict_char='_')
for k, v in postvars.iteritems():
member = [m for m in teammembers if m["id"] == int(k)][0]
member['share'] = v["share"]
DB.set('teammembers', teammembers)
DB.dump()
return render_template('team-members.html', teammembers=teammembers)
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('--debug', '-d', action='store_true')
parser.add_argument('--port', '-p', default=5000, type=int)
parser.add_argument('--host', default='0.0.0.0')
args = parser.parse_args()
app.run(args.host, args.port, debug=args.debug)
I have three template files, but you of course don't need this many. team-members.html has the code that's relevant to this problem.
_formhelpers.html:
{% macro render_input(id, fieldname, value) %}<input type="text" name="{{ id }}_{{ fieldname }}" value="{{ value }}" />{% endmacro %}
layout.html:
<!doctype html>
<html>
<head>
<title>Support Team Site</title>
</head>
<body>
<div class="page">
<h1>Support Team Site</h1>
{% for message in get_flashed_messages() %}
<div class=flash>{{ message }}</div>
{% endfor %}
{% block body %}{% endblock %}
</div>
</body>
</html>
team-members.html:
{% from "_formhelpers.html" import render_input %}
{% extends "layout.html" %}
{% block body %}
<form action="/team-members" method="post">
<table>
<tr>
<th>Name</th>
<th>ID</th>
<th>Inbox Share</th>
</tr>
{% for member in teammembers %}
<tr>
<td>{{member['name']}}</td>
<td>{{member['id']}}</td>
<td>{{ render_input(member['id'], 'share', member['share']) }}</td>
</tr>
{% endfor %}
</table>
<button type="submit">Send</button>
</form>
{% endblock %}
This will render the following HTML:
<!doctype html>
<html>
<head>
<title>Support Team Site</title>
</head>
<body>
<div class="page">
<h1>Support Team Site</h1>
<form action="/team-members" method="post">
<table>
<tr>
<th>Name</th>
<th>ID</th>
<th>Inbox Share</th>
</tr>
<tr>
<td>Ben</td>
<td>55555</td>
<td><input type="text" name="55555_share" value="0" /></td>
</tr>
<tr>
<td>Amy</td>
<td>66666</td>
<td><input type="text" name="66666_share" value="1" /></td>
</tr>
<tr>
<td>Ted</td>
<td>77777</td>
<td><input type="text" name="77777_share" value="1" /></td>
</tr>
</table>
<button type="submit">Send</button>
</form>
</div>
</body>
</html>
It's worth mentioning what's going on in the if request.method == 'POST': part of app.py. The request.form variable will be of type ImmutableMultiDict, which would look kind of like this when printed out:
ImmutableMultiDict([('55555_share', u'0'), ('66666_share', u'1'), ('77777_share', u'1')])
This is somewhat useful, but we'd still have to parse this by hand to do anything with it. Note the format of the keys there, in the id_fieldname format (e.g. 55555_share). This was thanks to the render_input macro we put in our _formhelpers.html template file. When we process the post form input, we use variabledecode.variable_decode(request.form, dict_char='_'), which parses the form data and turns it into a dictionary based on the naming convention we used for the name values of the form inputs. Here's what it looks like:
{
"55555": {
"share": "0"
},
"66666": {
"share": "1"
},
"77777": {
"share": "1"
}
}
This makes it easy to map back to our original data and update it.
来源：https://stackoverflow.com/questions/29504067/render-an-editable-table-using-flask-jinja2-templates-then-process-the-form-da