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我正在使用 python 和烧瓶创建一个货币转换器，并尝试为无效输入闪烁错误消息。表单在提交时会自动路由到错误检查。我一直在操纵输入以故意引发错误，并且 KeyError 显示在我的浏览器中，但没有在我的页面上闪烁。

这些是我正在尝试做的检查：

def check_valid_code():
    converting_from = (request.form['converting_from']).upper()
    converting_to = (request.form['converting_to']).upper()
    c= CurrencyCodes()
    try:
         c.get_symbol(converting_from)
    except KeyError:
        flash("{converting_from} is not a valid currency code!")
    
    try:
         c.get_symbol(converting_to)
    except KeyError:
        flash("{converting_to} is not a valid currency code!")

def check_valid_number():
    amount = request.form['amount']
    if amount.isnumeric() == True:
        amount= float(amount)
        return amount
    else:
        flash("Not a valid amount.")

我的 base.html（使用 Bootstrap）应该出现消息：

<body>
  <div class="container" style="min-height:100% width:80%">
    <div class="col-sm-4">
      {% with errors = get_flashed_messages(category_filter=["danger"]) %}
          {% if errors %}
              {%- for message in errors %}
                  <div class="alert alert-danger alert-dismissible fade show" role="alert">
                      <span>{{ message }}</span>
                      <button type="button" class="close" data-dismiss="alert" aria-label="Close">
                          <span aria-hidden="true">&times;</span>
                      </button>
                  </div>
              {% endfor -%}
          {% endif %}
      {% endwith %}
  </div>
    {% block content %}
    {% endblock %}
  </div>
</body>
4

1 回答 1

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您应该使用 Flask 中的 render_template 库，您的代码如下所示：

from flask import Flask, render_template

def check_valid_code():
    converting_from = (request.form['converting_from']).upper()
    converting_to = (request.form['converting_to']).upper()
    c= CurrencyCodes()
    try:
         c.get_symbol(converting_from)
    except KeyError:
        message = "{converting_from} is not a valid currency code!"
    
    try:
         c.get_symbol(converting_to)
    except KeyError:
        message = "{converting_to} is not a valid currency code!"

return render_template('base.html',message=message)

def check_valid_number():
    amount = request.form['amount']
    if amount.isnumeric() == True:
        amount= float(amount)
        return amount
    else:
        message = "Not a valid amount."

return render_template('base.html',message=message)
于 2020-11-24T21:26:17.420 回答