Python 使用烧瓶从选择标签中获取价值
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Getting value from select tag using flask
提问by qwertyuip9
I'm new to Flask and I'm having trouble getting the value from my select tag. I have tried request.form['comp_select']which returns a Bad Request. However, when I try using request.form.get('comp_select'), my return page returns a blank list "[]".
我是 Flask 的新手，无法从 select 标签中获取值。我试过request.form['comp_select']它返回一个错误的请求。但是，当我尝试使用 时request.form.get('comp_select')，我的返回页返回一个空白列表“[]”。
My html:
我的html：
<form class="form-inline" action="{{ url_for('test') }}">
<div class="form-group">
<div class="input-group">
<span class="input-group-addon">Please select</span>
<select name="comp_select" class="selectpicker form-control">
{% for o in data %}
<option value="{{ o.name }}">{{ o.name }}</option>
{% endfor %}
</select>
</div>
<button type="submit" class="btn btn-default">Go</button>
</div>
</form>
My app.py:
我的应用程序.py：
@app.route("/test" , methods=['GET', 'POST'])
def test():
select = request.form.get('comp_select')
return(str(select)) # just to see what select is
Sorry in advance if my formatting is off for the post (also new to Stack Overflow).
如果我的帖子格式已关闭，请提前抱歉（也是 Stack Overflow 的新手）。
采纳答案by Rob?
It's hard to know for certain from what you've provided, but I believe you need to add method="POST"to your <form>element.
从您提供的内容中很难确定，但我相信您需要添加method="POST"到您的<form>元素中。
From the flask doc for the requestobject:
To access form data (data transmitted in a POST or PUT request) you can use the form attribute. ... To access parameters submitted in the URL (?key=value) you can use the args attribute.
要访问表单数据（在 POST 或 PUT 请求中传输的数据），您可以使用 form 属性。... 要访问在 URL (?key=value) 中提交的参数，您可以使用 args 属性。
So, if you submit your forms via POST, use request.form.get(). If you submit your forms via GET, use request.args.get().
因此，如果您通过 POST 提交表单，请使用request.form.get(). 如果您通过 GET 提交表单，请使用request.args.get().
This app behaves the way you want it to:
这个应用程序按照您希望的方式运行：
flask_app.py:
烧瓶应用程序.py：
#!/usr/bin/env python
from flask import Flask, flash, redirect, render_template, \
request, url_for
app = Flask(__name__)
@app.route('/')
def index():
return render_template(
'index.html',
data=[{'name':'red'}, {'name':'green'}, {'name':'blue'}])
@app.route("/test" , methods=['GET', 'POST'])
def test():
select = request.form.get('comp_select')
return(str(select)) # just to see what select is
if __name__=='__main__':
app.run(debug=True)
templates/index.html
模板/index.html
<form class="form-inline" method="POST" action="{{ url_for('test') }}">
<div class="form-group">
<div class="input-group">
<span class="input-group-addon">Please select</span>
<select name="comp_select" class="selectpicker form-control">
{% for o in data %}
<option value="{{ o.name }}">{{ o.name }}</option>
{% endfor %}
</select>
</div>
<button type="submit" class="btn btn-default">Go</button>
</div>
</form>
