django admin 给字段设置输入提示信息

• django admin 后台默认的样式可能不满足我们的需求，这个时候，我们就需要重写默认的样式。
• 我找到的有两种方法，其中一种（formfield_overrides）只能针对某种字段类型，不能指定字段。这里只介绍另一种，可以指定具体哪个字段。
• 这里只实现了提示信息，当然还可以设置输入框长度、宽度等。

• admin.py

@admin.register(models.WarnUser)
class WarnUserAdmin(admin.ModelAdmin):
    """趋势预警用户"""
    form = forms.WarnUserAdminForm
    list_display = ('id', 'nickname', 'is_enable', 'duty', 'phone', 'wts', 'remarks')
    list_editable = ('is_enable', 'duty', 'nickname', 'phone', 'remarks')
    fields = ('id', 'is_enable', 'duty', 'nickname', 'phone', 'type', 'remarks')
    ordering = ('id',)
    empty_value_display = '-auto-'
    search_fields = ['nickname']
    readonly_fields = ['id']
    list_per_page = 20
    list_display_links = ('id', 'wts')

    ack = False

    def get_queryset(self, request):
        utils.sync_add_ws()
        return super(WarnUserAdmin, self).get_queryset(request)

    def save_related(self, request, form, formsets, change):
        if self.ack:
            super(WarnUserAdmin, self).save_related(request, form, formsets, change)

    def save_model(self, request, obj, form, change):
        sn_user = models.WarnUser.objects.filter(nickname=obj.nickname)
        if obj.id is None:
            if not re.match(r"^1[3-9]d{9}$", obj.phone):
                self.ack = False
                msg = '【手机号】有误'
                err_msg(request, msg)
            elif len(sn_user) != 0:
                self.ack = False
                msg = '该昵称已存在'
                err_msg(request, msg)
            else:
                super(WarnUserAdmin, self).save_model(request, obj, form, change)
                self.ack = True
        else:
            super(WarnUserAdmin, self).save_model(request, obj, form, change)
            self.ack = True

    def delete_queryset(self, request, queryset):
        os = queryset.values()
        for obj in os:
            wid = obj['id']
            models.DataWarnUser.objects.filter(id=wid).delete()
        super(WarnUserAdmin, self).delete_queryset(request, queryset)

    def delete_view(self, request, object_id, extra_context=None):
        models.DataWarnUser.objects.filter(id=object_id).delete()
        super(WarnUserAdmin, self).delete_view(request, object_id, extra_context)

• forms.py

from django import forms
from django.forms import widgets

from pms import models


class WarnUserAdminForm(forms.ModelForm):
    class meta:
        model = models.WarnUser
        fields = '__all__'
        widgets = {
            "nickname": widgets.TextInput(attrs={"style": "width:50%;", "placeholder": "请输入呢称，不可重复"}),
        }

@admin.register(models.WarnUser)
class WarnUserAdmin(admin.ModelAdmin):
    """趋势预警用户"""
    list_display = ('id', 'nickname', 'is_enable', 'duty', 'phone', 'wts', 'remarks')
    list_editable = ('is_enable', 'duty', 'nickname', 'phone', 'remarks')
    fields = ('id', 'is_enable', 'duty', 'nickname', 'phone', 'type', 'remarks')
    ordering = ('id',)
    empty_value_display = '-auto-'
    search_fields = ['nickname']
    readonly_fields = ['id']
    list_per_page = 20
    list_display_links = ('id', 'wts')

	# 重写字段类型的 widget, attrs 属性可以设置前端样式
    formfield_overrides = {
        models.IntegerField: {'widget': widgets.NumberInput(attrs={"style": "width:50em;", })},
        models.CharField: {'widget': widgets.TextInput(attrs={"style": "width:50%;", "placeholder": "请输入内容"})},
    }

    ack = False

    def get_queryset(self, request):
        utils.sync_add_ws()
        return super(WarnUserAdmin, self).get_queryset(request)

    def save_related(self, request, form, formsets, change):
        if self.ack:
            super(WarnUserAdmin, self).save_related(request, form, formsets, change)

    def save_model(self, request, obj, form, change):
        sn_user = models.WarnUser.objects.filter(nickname=obj.nickname)
        if obj.id is None:
            if not re.match(r"^1[3-9]d{9}$", obj.phone):
                self.ack = False
                msg = '【手机号】有误'
                err_msg(request, msg)
            elif len(sn_user) != 0:
                self.ack = False
                msg = '该昵称已存在'
                err_msg(request, msg)
            else:
                super(WarnUserAdmin, self).save_model(request, obj, form, change)
                self.ack = True
        else:
            super(WarnUserAdmin, self).save_model(request, obj, form, change)
            self.ack = True

    def delete_queryset(self, request, queryset):
        os = queryset.values()
        for obj in os:
            wid = obj['id']
            models.DataWarnUser.objects.filter(id=wid).delete()
        super(WarnUserAdmin, self).delete_queryset(request, queryset)

    def delete_view(self, request, object_id, extra_context=None):
        models.DataWarnUser.objects.filter(id=object_id).delete()
        super(WarnUserAdmin, self).delete_view(request, object_id, extra_context)