如何在Flask表单中区分多个提交按钮并执行不同操作？

我来帮你搞定这个问题～你现在的核心需求是没法区分四个提交按钮的触发事件，其实Flask-WTF已经提供了很简单的判断方式，咱们一步步来调整：

首先先修正你现有代码里的几个小错误，不然功能会出问题：

第一步：修正forms.py里的字段笔误 #

你把maximum_temp误写成了SubmitField，这明显是手滑了，应该改成StringField，同时可以把按钮命名对应上功能，更清晰：

from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField

class Form_Setting(FlaskForm):
    email_adress = StringField(label='Email')
    dooralarm_time = StringField(label='Türalarm')
    minimum_temp = StringField(label='MinTemp')
    maximum_temp = StringField(label='MaxTemp')  # 修正为StringField
    submit_email = SubmitField(label='Eingabe')
    submit_door = SubmitField(label='Eingabe')
    submit_temp_min = SubmitField(label='Eingabe')  # 对应最小温度提交
    submit_temp_max = SubmitField(label='Eingabe')  # 对应最大温度提交

第二步：修正settings.html里的字段绑定错误 #

你在最小温度和最大温度的表单里，错误绑定了dooralarm_time字段，得改成对应的目标字段：

<!--Temp. Schwellwert Minimal 修正后-->
<div class="row ">
    <div class="col-sm-12">
        <div class="d-flex justify-content-start align-items-center" style="height: 8vh;">
            <div class="col-sm-3 ">
                <h3 class="setting-label">Temp. Schwellwert Minimal</h3>
            </div>
            <div class="col-sm-9">
                <form  method="POST" class="form-register flex-fill d-flex" >
                    {{ form.hidden_tag() }}
                    {{ form.minimum_temp(class="form-control", placeholder="Temp. Minimal") }}
                    {{ form.submit_temp_min(class="btn btn-md btn-block btn-primary", style="background-color: #6941c6; border:none; color: #f9f5ff; margin-left: 1vw;" )}}
                </form>
            </div>
        </div>
        <hr class="divider">
    </div>
</div>

<!--Temp. Schwellwert Maximal 修正后-->
<div class="row ">
    <div class="col-sm-12">
        <div class="d-flex justify-content-start align-items-center" style="height: 8vh;">
            <div class="col-sm-3 ">
                <h3 class="setting-label">Temp. Schwellwert Maximal</h3>
            </div>
            <div class="col-sm-9">
                <form  method="POST" class="form-register flex-fill d-flex" >
                    {{ form.hidden_tag() }}
                    {{ form.maximum_temp(class="form-control", placeholder="Temp. Maximal") }}
                    {{ form.submit_temp_max(class="btn btn-md btn-block btn-primary", style="background-color: #6941c6; border:none; color: #f9f5ff; margin-left: 1vw;" )}}
                </form>
            </div>
        </div>
        <hr class="divider">
    </div>
</div>

第三步：在routes.py里区分不同提交按钮 #

核心逻辑很简单：当某个提交按钮被点击时，对应的SubmitField的data属性会变成True，咱们只要在form.validate_on_submit()之后判断这个值就行。另外建议你更新现有设置记录而不是每次新增，不然数据库会攒一堆重复数据：

from page import app
from flask import render_template, redirect, url_for
from page.models import Settings
from page.forms import Form_Setting
from page import db

@app.route('/settings', methods=['GET','POST'] )
def Settings_Page():
    form = Form_Setting()
    # 获取现有设置记录，没有则新建（假设你的Settings是单条记录存储全局设置）
    current_settings = Settings.query.first() or Settings()
    
    if form.validate_on_submit():
        # 判断是邮箱提交按钮被触发
        if form.submit_email.data:
            current_settings.email_adress = form.email_adress.data
        # 判断是门警报时间提交按钮被触发
        elif form.submit_door.data:
            current_settings.dooralarm_time = form.dooralarm_time.data
        # 判断是最小温度提交按钮被触发
        elif form.submit_temp_min.data:
            current_settings.minimum_temp = form.minimum_temp.data
        # 判断是最大温度提交按钮被触发
        elif form.submit_temp_max.data:
            current_settings.maximum_temp = form.maximum_temp.data
        
        # 保存到数据库
        db.session.add(current_settings)
        db.session.commit()
        return redirect(url_for('Settings_Page'))
    
    # GET请求时，把现有设置填充到表单里
    form.email_adress.data = current_settings.email_adress or ""
    form.dooralarm_time.data = current_settings.dooralarm_time or ""
    form.minimum_temp.data = current_settings.minimum_temp or ""
    form.maximum_temp.data = current_settings.maximum_temp or ""
    
    return render_template('settings.html',form=form)

另外还有一种备选方法：通过request.form检查按钮的name是否存在，比如if 'submit_email' in request.form:，效果和上面的方法完全一致，选你习惯的就行。

备注：内容来源于stack exchange，提问作者aNewDivide