在Django表单中,我如何使字段只读(或禁用)?

当使用表单创建新条目时,应该启用所有字段——但当记录处于更新模式时,某些字段需要为只读。

例如,当创建一个新的Item模型时,所有字段都必须是可编辑的,但是在更新记录时,是否有一种方法禁用sku字段,使其可见,但不能编辑?

class Item(models.Model):
    sku = models.CharField(max_length=50)
    description = models.CharField(max_length=200)
    added_by = models.ForeignKey(User)


class ItemForm(ModelForm):
    class Meta:
        model = Item
        exclude = ('added_by')

def new_item_view(request):
    if request.method == 'POST':
        form = ItemForm(request.POST)
        # Validate and save
    else:
            form = ItemForm()
    # Render the view

ItemForm类可以重用吗?ItemForm或Item模型类需要做哪些更改?我是否需要编写另一个类“ItemUpdateForm”来更新项目?

def update_item_view(request):
    if request.method == 'POST':
        form = ItemUpdateForm(request.POST)
        # Validate and save
    else:
        form = ItemUpdateForm()

当前回答

如果您需要多个只读字段。您可以使用下面给出的任何方法

方法1

class ItemForm(ModelForm):
    readonly = ('sku',)

    def __init__(self, *arg, **kwrg):
        super(ItemForm, self).__init__(*arg, **kwrg)
        for x in self.readonly:
            self.fields[x].widget.attrs['disabled'] = 'disabled'

    def clean(self):
        data = super(ItemForm, self).clean()
        for x in self.readonly:
            data[x] = getattr(self.instance, x)
        return data

方法2

继承的方法

class AdvancedModelForm(ModelForm):


    def __init__(self, *arg, **kwrg):
        super(AdvancedModelForm, self).__init__(*arg, **kwrg)
        if hasattr(self, 'readonly'):
            for x in self.readonly:
                self.fields[x].widget.attrs['disabled'] = 'disabled'

    def clean(self):
        data = super(AdvancedModelForm, self).clean()
        if hasattr(self, 'readonly'):
            for x in self.readonly:
                data[x] = getattr(self.instance, x)
        return data


class ItemForm(AdvancedModelForm):
    readonly = ('sku',)

其他回答

这是最简单的方法吗?

在视图代码中是这样的:

def resume_edit(request, r_id):
    .....    
    r = Resume.get.object(pk=r_id)
    resume = ResumeModelForm(instance=r)
    .....
    resume.fields['email'].widget.attrs['readonly'] = True 
    .....
    return render(request, 'resumes/resume.html', context)

它工作得很好!

沃克的回答对我帮助很大!

我用get_readonly_fields修改了他的例子,让它在Django 1.3中工作。

通常你应该在app/admin.py中声明这样的东西:

class ItemAdmin(admin.ModelAdmin):
    ...
    readonly_fields = ('url',)

我是这样适应的:

# In the admin.py file
class ItemAdmin(admin.ModelAdmin):
    ...
    def get_readonly_fields(self, request, obj=None):
        if obj:
            return ['url']
        else:
            return []

它工作得很好。现在,如果您添加一个Item, url字段是读写的,但在更改时它变成只读的。

对于Admin版本,如果你有多个字段,我认为这是一个更紧凑的方式:

def get_readonly_fields(self, request, obj=None):
    skips = ('sku', 'other_field')
    fields = super(ItemAdmin, self).get_readonly_fields(request, obj)

    if not obj:
        return [field for field in fields if not field in skips]
    return fields

如何使用Django 1.11:

class ItemForm(ModelForm):
    disabled_fields = ('added_by',)

    class Meta:
        model = Item
        fields = '__all__'

    def __init__(self, *args, **kwargs):
        super(ItemForm, self).__init__(*args, **kwargs)
        for field in self.disabled_fields:
            self.fields[field].disabled = True

基于@paeduardo的回答(这是多余的),你可以在表单类初始化器中禁用一个字段:

class RecordForm(ModelForm):

     def __init__(self, *args, **kwargs):
            super().__init__(*args, **kwargs)
            var = self.fields['the_field']
            var.disabled = True