Flask 没有获得复选框值 [英] Flask isn't getting the checkbox value

问题描述

当我点击提交按钮时，我试图打印出 Flask 中的复选框值.

app.py 片段:

@app.route('/test2', methods=['GET', 'POST'])def test2():如果 request.method == "POST":如果 request.form['submit'] == 'submit':打印(request.args.get('check'))返回 render_template('test.html')

HTML:

<form role="form" method="post"><input type="checkbox" name="check" value="test"><button type="submit" name="submit" value="submit">Submit</button></表单>

当我点击提交按钮时它返回无".

我也试过 request.form.get()

@app.route('/test2', methods=['GET', 'POST'])def test2():如果 request.method == "POST":如果 request.form['submit'] == 'submit':打印(request.form.get('check'))返回 render_template('test.html')

这也返回无".

解决方案

提交 HTML 表单时，未选中的复选框不会发送任何数据.在 Flask 方面，form 中不会有键，因为没有收到任何值.如果您想检查是否选中了单个复选框(具有唯一名称)，只需测试其名称是否在 form 中.如果要检查多个复选框(具有相同名称)中的哪一个被选中，请改用 getlist.

一个布尔值:

checked = 'check' in request.form

多个选项:

<input type="checkbox" name="check" value="2"><input type="checkbox" name="check" value="3">

selected = request.form.getlist('check')any_selected = bool(selected)

I am trying to print off the checkbox value in Flask when I hit the submit button.

app.py snippet:

@app.route('/test2', methods=['GET', 'POST'])
def test2():

    if request.method == "POST":
        if request.form['submit'] == 'submit':
            print(request.args.get('check'))

    return render_template('test.html')

HTML:

<div class="container"><br>
  <form role="form" method="post">
    <input type="checkbox" name="check" value="test">
    <button type="submit" name="submit" value="submit">Submit</button>
  </form>
</div>

It returns 'None' when I hit the submit button.

I have also tried request.form.get()

@app.route('/test2', methods=['GET', 'POST'])
def test2():

    if request.method == "POST":
        if request.form['submit'] == 'submit':
            print(request.form.get('check'))

    return render_template('test.html')

That also returns 'None'.

解决方案

When submitting an HTML form, unchecked checkboxes do not send any data. On Flask's side, there will not be a key in form, since no value was received. If you want to check if a single checkbox (with a unique name) is checked, just test if it's name is in form. If you want to check which of multiple checkboxes (with the same name) are checked, use getlist instead.

One boolean:

<input type="checkbox" name="check">

checked = 'check' in request.form

Multiple options:

<input type="checkbox" name="check" value="1">
<input type="checkbox" name="check" value="2">
<input type="checkbox" name="check" value="3">

selected = request.form.getlist('check')
any_selected = bool(selected)

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