ImageField以清晰的形式布局预览

Question

我想从ImageField显示图像.我正在使用Django 脆皮形式.看来我需要使用HTML布局助手,但我不知道如何在这里访问模板变量.

以下呈现空白图像标记:

HTML('<img src="{{ logo.url }}" />')

我引用了这个错误,还是有一种更好的方法？

这是完整的代码,因此您可以获得更好的想法:

forms.py

class CompanyForm(forms.Form):
    name = forms.CharField(required=False, label="Company name")
    logo = forms.ImageField(required=False, label="Logo")

    # form layout
    helper = FormHelper()
    helper.form_class = 'form-horizontal'
    helper.layout = Layout(
        Div(
            'name',
            HTML('<img src="{{ logo.url }}" />'),
            css_class='span4',
        ),

        FormActions(
            Submit('submit', 'Save', css_class="btn-primary pull-right"),
        )
    )

models.py

class Company(models.Model):
    name = models.CharField(max_length=100)
    logo = models.ImageField(upload_to = 'logos/', null=True)

views.py

我在视图中设置了表单的初始值:

...
profile = Company.objects.get(name="foo")
form = CompanyForm(initial={'name': profile.name, 'logo': profile.logo, })

context = {
    'profile_form' : form,
}

return render_to_response('dashboard/company-profile.html', context_instance=RequestContext(request, context))    

公司profile.html

{% load crispy_forms_tags %}
<div class="row">
  {% crispy profile_form %}
</div>

Answer 1

有趣的是,我今天刚刚在内联图像上传表单上处理同样的问题,我最终得到了这个实现:

class ImageModelForm(forms.ModelForm):

    class Meta:
        model = ImageModel

    def __init__(self, *args, **kwargs):
        super(ImageModelForm, self).__init__(*args, **kwargs)
        self.helper = FormHelper(self)
        self.helper.form_tag = False
        self.helper.disable_csrf = True
        self.helper.layout = Layout(
            'title',
            'description',
            'imagefile',
            HTML("""{% if form.imagefile.value %}<img class="img-responsive" src="{{ MEDIA_URL }}{{ form.imagefile.value }}">{% endif %}""", ),
            'flag_featured',
        )