Django ModelForm ImageField

Question

我有一个模型和一个表单(forms.ModelForm)，其中我有一个ImageField。该模型类似于：

class Business(models.Model):
    business_name = models.CharField(max_length=128)
    .
    .
    business_image = ImageField(
        max_length=128, 
        upload_to=upload_business_image_handler,
        height_field='business_image_height',
        width_field='business_image_width'
        )
    business_image_height = models.IntegerField(blank=True, null=True)
    business_image_width = models.IntegerField(blank=True, null=True)
    .
    .

随附的表格：

class BusinessForm(forms.ModelForm):
    def __init__(self, data=None, files=None, branch_list = None, country_list = None, *args, **kwargs):
        super(BusinessForm, self).__init__(data, *args, **kwargs)
        # create the MultipleChoiceField choice_list based on language
        self.fields['branch'].choices = branch_list
        self.fields['country'].choices = country_list
        self.postdata = data
        self.files = files

    business_name = forms.CharField(widget=forms.TextInput(attrs={'size':'50', 'class': 'address'}), required=True)

    #business_image = forms.ImageField(widget=forms.ClearableFileInput())

表单中的最后一行被注释掉了，因为forms.ClearableFileInput()是FileFields和ImageFields的默认小部件。

现在，当此表单用于编辑现有记录时，模板中的图像如下所示：

Currently: <image_url>
Change: <browse_button>

我想更改文本标签“当前”和“更改”，而不是显示image_url，我想显示图像。

当然，我可以复制并修改‘site-package/django/forms/widgets.py’中的‘类ClearableFileInput(FileInput)’代码，但我想知道这是否是实现此目的的方法。

任何帮助或建议都是非常感谢的。

现在，我已经查看了“ClearableFileInput(FileInput)类”的代码。

Answer 1

这是我对同样问题的解决方案。

from django.utils.safestring import mark_safe
from django.utils.html import escape, conditional_escape
from django.utils.encoding import force_unicode
from django.forms.widgets import ClearableFileInput, Input, CheckboxInput

class CustomClearableFileInput(ClearableFileInput):

    def render(self, name, value, attrs=None):
        substitutions = {
            #uncomment to get 'Currently'
            'initial_text': "", # self.initial_text, 
            'input_text': self.input_text,
            'clear_template': '',
            'clear_checkbox_label': self.clear_checkbox_label,
            }
        template = '%(input)s'
        substitutions['input'] = Input.render(self, name, value, attrs)

        if value and hasattr(value, "url"):
            template = self.template_with_initial
            substitutions['initial'] = ('<img src="%s" alt="%s"/>'
                                        % (escape(value.url),
                                           escape(force_unicode(value))))
            if not self.is_required:
                checkbox_name = self.clear_checkbox_name(name)
                checkbox_id = self.clear_checkbox_id(checkbox_name)
                substitutions['clear_checkbox_name'] = conditional_escape(checkbox_name)
                substitutions['clear_checkbox_id'] = conditional_escape(checkbox_id)
                substitutions['clear'] = CheckboxInput().render(checkbox_name, False, attrs={'id': checkbox_id})
                substitutions['clear_template'] = self.template_with_clear % substitutions

        return mark_safe(template % substitutions)

然后只需使用扩展的小部件：

business_image = forms.ImageField(widget=CustomClearableFileInput())

Answer 2

我把这个放到模板表单中

{% if business.business_image %}
   <img src="{{ business.business_image.url }}" title="{{ business.business_name}}" />
{% endif %}

Answer 3

这是我的imageInput版本，它显示图像，但不允许清除图像

只需在form类中指定字段具有widget=NonClearableImageInput()

from django.forms.widgets import FileInput
from django.utils.html import conditional_escape
from django.utils.safestring import mark_safe

class NonClearableImageInput(FileInput):
    def render(self, name, value, attrs=None):
        template = '%(input)s'
        data = {'input': None, 'url': None}
        data['input'] = super(NonClearableImageInput, self).render(name, value, attrs)

        if hasattr(value, 'url'):
            data['url'] = conditional_escape(value.url)
            template = '%(input)s <img src="%(url)s">'

        return mark_safe(template % data)