Question

我正在Django中构建一个非常简单的表单，并希望在Bootstrap警报标签中显示表单错误。我知道如何执行此操作（例如Django docs或Django Forms: if not valid, show form with error message或How to render Django form errors not in a UL? ）。但是，当我这样做时，我看到错误出现了两次。似乎模板中Django的{{ form }}元素除了我自定义格式的错误外，默认情况下还在ul标签中显示错误。

避免重复的最佳方法是什么？

在template.html中：

<!--Load the file search form from the view-->
<form action="" method="post" id="homepage_filesearch">
    <!--Show any errors from a previous form submission-->
    {% if form.errors %}
        {% for field in form %}
            {% for error in field.errors %}
                <div class="alert alert-danger">
                    <strong>{{ error|escape }}</strong>
                </div>
            {% endfor %}
        {% endfor %}
    {% endif %}

    {{ csrf_input }}
    {{ form }}
    <button class="btn btn-primary" type="submit">Search</span></button>
</form>

在views.py中：

from .forms import FileSearchForm
def view(request):
    # Create a form instance and populate it with data from the request
    form = FileSearchForm(request.POST or None)

    # If this is a POST request, we need to process the form data
    if request.method == 'POST':
        if form.is_valid():
            return form.redirect_to_files()

    template = 'template.html'
    context = {'form': form}

    return render(request, template, context)

在forms.py中：

class FileSearchForm(forms.Form):
    # Define search field
    search = forms.CharField(label='', max_length=500, required=True,
                             empty_value='Search')

    def clean_search(self):
        # Get the cleaned search data
        search = self.cleaned_data['search']

        # Make sure the search is either a proposal or fileroot
        if some_error_case:
            raise forms.ValidationError('Invalid search term {}. Please provide proposal number or file root.'.format(search))

无效搜索后的结果：

Answer 1

默认情况下，form的顶部显示非字段错误。您可以在django source code上看到它：

def _html_output(self, normal_row, error_row, 
                       row_ender, help_text_html, errors_on_separate_row):
    "Output HTML. Used by as_table(), as_ul(), as_p()."
    # Errors that should be displayed above all fields.
    top_errors = self.non_field_errors()

您应该详细说明模板，以避免重复的错误消息，例如Looping over the form’s fields文档的示例：

{{ csrf_input }}
{% for field in form %}
    <div class="fieldWrapper">
        {{ field.errors }}   #<-- IDK if you want to render field errors.
        {{ field.label_tag }} {{ field }}
        {% if field.help_text %}
        <p class="help">{{ field.help_text|safe }}</p>
        {% endif %}
    </div>
{% endfor %}

（而不只是{{ form }}}

自定义格式的Django表单错误出现了两次

1 个答案: