获取 Flask 中复选框的值 [英] Get the value of a checkbox in Flask

问题描述

我想获取 Flask 中复选框的值.我已经阅读了类似的帖子并试图使用 request.form.getlist('match') 的输出，因为它是一个列表，所以我使用 [0]，但似乎我做错了什么.这是获取输出的正确方法还是有更好的方法?

I want to get the value of a checkbox in Flask. I've read a similar post and tried to use the output of request.form.getlist('match') and since it's a list I use [0], but it seems I'm doing something wrong. Is this the correct way to get the output or is there a better way?

<input type="checkbox" name="match" value="matchwithpairs" checked> Auto Match

if request.form.getlist('match')[0] == 'matchwithpairs':
    # do something

推荐答案

你不需要使用 getlist，如果只有一个 input名字，虽然这不重要.你所展示的确实有效.这是一个简单的可运行示例:

You don't need to use getlist, just get if there's only one input with the given name, although it shouldn't matter. What you've shown does work. Here's a simple runnable example:

from flask import Flask, request

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def index():
    if request.method == 'POST':
        print(request.form.getlist('hello'))

    return '''<form method="post">
<input type="checkbox" name="hello" value="world" checked>
<input type="checkbox" name="hello" value="davidism" checked>
<input type="submit">
</form>'''

app.run()

提交带有两个复选框的表单会在终端中打印 ['world', 'davidism'].请注意，html 表单的方法是 post，因此数据将在 request.form 中.

Submitting the form with both boxes checked prints ['world', 'davidism'] in the terminal. Note that the html form's method is post so that the data will be in request.form.

虽然在某些情况下了解字段的实际值或值列表很有用，但看起来您只关心是否选中了该框.在这种情况下，更常见的做法是为复选框指定一个唯一名称，然后只检查它是否有任何值.

While there are some cases where knowing the actual value or list of values of an field is useful, it looks like all you care about is whether the box was checked. In this case, it's more common to give the checkbox a unique name and just check if it has any value at all.

<input type="checkbox" name="match-with-pairs"/>
<input type="checkbox" name="match-with-bears"/>

if request.form.get('match-with-pairs'):
    # match with pairs

if request.form.get('match-with-bears'):
    # match with bears (terrifying)

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