djangoNotes
学员管理
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="/static/plugins/bootstrap/css/bootstrap.css">
<link rel="stylesheet" href="/static/plugins/font-awesome/css/font-awesome.css">
<style>
.icon {
margin: 0 8px;
}
</style>
</head>
<body> <div class="container">
<div style="padding: 20px 0;"> <a href="#" id="addBtn" class="btn btn-primary ">添加</a>
<a href="#" class="btn btn-danger">删除</a>
</div> <div>
<table class="table table-bordered table-striped">
<thead>
<tr>
<th>ID</th>
<th>姓名</th>
<th>年龄</th>
<th>性别</th>
<th>班级</th>
<th>操作</th>
</tr>
</thead>
<tbody id="tb">
{% for row in stu_list %}
<tr nid="{{ row.id }}">
<td na="nid">{{ row.id }}</td>
<td na="user">{{ row.username }}</td>
<td na="age">{{ row.age }}</td>
<td na="gender">{{ row.gender }}</td>
<td na="cls_id" cid="{{ row.cs_id }}">{{ row.cs.title }}</td>
<td>
<a class="glyphicon glyphicon-remove icon del-row"></a>
<a class="fa fa-pencil-square-o icon edit-row"></a>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
</div> <!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span>
</button>
<h4 class="modal-title" id="myModalLabel">创建学生</h4>
</div>
<div class="modal-body">
<form id="fm" class="form-horizontal"> <div class="form-group">
<label for="username" class="col-sm-2 control-label">姓名</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="username" placeholder="姓名">
</div>
</div> <div class="form-group">
<label for="age" class="col-sm-2 control-label">年龄</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="age" placeholder="年龄">
</div>
</div>
<div class="form-group">
<label for="gender" class="col-sm-2 control-label">性别</label>
<div class="col-sm-10">
<label class="radio-inline">
<input type="radio" name="gender" value=""> 男
</label>
<label class="radio-inline">
<input type="radio" name="gender" value=""> 女
</label>
</div>
</div> <div class="form-group">
<label for="gender" class="col-sm-2 control-label">班级</label>
<div class="col-sm-10"> <select class="form-control" name="cls_id"> {% for cla in cla_list %}
<option value="{{ cla.id }}">{{ cla.title }}</option>
{% endfor %} </select>
</div>
</div> </form>
</div> <div class="modal-footer">
<span id="errorMsg" style="color: red"></span>
<button type="button" class="btn btn-default" data-dismiss="modal">取消</button>
<button type="button" class="btn btn-primary" id="btnSave">保存</button>
</div>
</div>
</div>
</div> <!-- Modal -->
<div class="modal fade" id="delModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
<div class="modal-dialog" role="document">
<div class="alert alert-danger" role="alert">
<h3>删除学生信息？</h3>
<div><input type="text " style="display: none" id="delNid"></div>
<div>
<button id="cancel" type="button" class="btn btn-default" data-dismiss="modal">取消</button>
<button id="delConfirm" type="button" class="btn btn-danger">确定</button>
</div>
</div>
</div>
</div> <!-- Modal -->
<div class="modal fade" id="editModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span>
</button>
<h4 class="modal-title" id="myModalLabel">编辑学生</h4>
</div>
<div class="modal-body">
<form id="fm" class="form-horizontal">
<input type="text" name="nid" style="display: none"/> <div class="form-group">
<label for="username" class="col-sm-2 control-label">姓名</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="user" placeholder="姓名">
</div>
</div> <div class="form-group">
<label for="age" class="col-sm-2 control-label">年龄</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="age" placeholder="年龄">
</div>
</div>
<div class="form-group">
<label for="gender" class="col-sm-2 control-label">性别</label>
<div class="col-sm-10">
<label class="radio-inline">
<input type="radio" name="gender" value=""> 男
</label>
<label class="radio-inline">
<input type="radio" name="gender" value=""> 女
</label>
</div>
</div> <div class="form-group">
<label for="gender" class="col-sm-2 control-label">班级</label>
<div class="col-sm-10"> <select class="form-control" name="cls_id"> {% for cla in cla_list %}
<option value="{{ cla.id }}">{{ cla.title }}</option>
{% endfor %} </select>
</div>
</div> </form>
</div> <div class="modal-footer">
<span id="errorMsg" style="color: red"></span>
<button type="button" class="btn btn-default" data-dismiss="modal">取消</button>
<button type="button" class="btn btn-primary" id="btnEditSave">保存</button>
</div>
</div>
</div>
</div> <script src="/static/js/jquery-3.1.1.js"></script>
<script src="/static/plugins/bootstrap/js/bootstrap.js"></script> <script>
$(function () {
bindEvent();
bindSave();
bindDel();
bindDelConfirm();
bindEdit();
bindEditConfirm();
}); //编辑提交事件
function bindEditConfirm() {
$('#btnEditSave').click(function () {
var postData = {};
$('#editModal').find('input,select').each(function () {
var v = $(this).val();
var n = $(this).attr('name');
if (n == 'gender') {
if ($(this).prop('checked')) {
postData[n] = v;
}
} else {
postData[n] = v;
}
});
$.ajax({
url: '/edit_student/',
type: 'POST',
data: postData,
dataType: 'JSON',
success: function (arg) {
if (arg.code == 1000) {
window.location.reload();
} else {
alert(arg.message);
}
}
})
})
} //绑定编辑按钮点击事件
function bindEdit() {
$('#tb').on('click', '.edit-row', function () {
$('#editModal').modal('show');
//1、获取当前行的所有数据
//2、将数据赋值到对应的对话框的指定位置 $(this).parent().prevAll().each(function () {
var v = $(this).text();
var n = $(this).attr('na');
if (n == 'cls_id') {
var cid = $(this).attr('cid');
$('#editModal select[name="cls_id"]').val(cid);
} else if (n == 'gender') {
//v=true
if (v == 'True') {
$('#editModal :radio[value=""]').prop('checked', true);
} else {
$('#editModal :radio[value=""]').prop('checked', true);
}
} else {
//n=age、nid
//v=18
$("#editModal input[name='" + n + "']").val(v)
}
}); })
} //绑定确定删除按钮点击事件
function bindDelConfirm() {
$("#delConfirm").click(function () {
var rowId = $("#delNid").val(); $.ajax({
url: '/del_student/',
type: "GET",
data: {'nid': rowId},
success: function (arg) {
var dict = JSON.parse(arg); if (dict.status) {
$('tr[nid="' + rowId + '"]').remove()
}
$('#delModal').modal('hide');
}
})
})
} //绑定删除按钮点击事件
function bindDel() {
$("#tb").on('click', '.del-row', function () {
$('#delModal').modal('show');
//获取当前行的ID,设置给delNid
var rowId = $(this).parent().parent().attr('nid');
$("#delNid").val(rowId);
})
} //绑定添加按钮点击事件
function bindEvent() {
$('#addBtn').click(function () {
$('#myModal').modal('show')
})
} //绑定添加保存按钮点击事件
function bindSave() {
$('#btnSave').click(function () {
var postData = {};
$('#myModal').find('input,select').each(function () {
var v = $(this).val();
var n = $(this).attr('name');
if (n == "gender") {
if ($(this).prop('checked')) {
postData[n] = v;
}
} else {
postData[n] = v;
} });
$.ajax({
url: '/add_student/',
type: 'POST',
data: postData,
success: function (arg) {
{#console.log(arg);#}
//arg是字符串
//JSON.parse将字符串转换为字典， json.loads
var dict = JSON.parse(arg);
if (dict.status) {
/*
postData={}
自增ID=dict.data
*/
nid = dict.data;
createRow(postData, nid);
$('#myModal').modal('hide');
{#window.location.reload();#}
} else {
$('#errorMsg').text(dict.message)
}
}
})
})
} //不刷新页面增加数据
function createRow(postData, nid) {
var tr = document.createElement('tr');
$(tr).attr('nid', nid); var tdId = document.createElement('td');
tdId.innerHTML = nid;
$(tr).append(tdId); var tdUser = document.createElement('td');
tdUser.innerHTML = postData.username;
$(tr).append(tdUser); var tdAge = document.createElement('td');
tdAge.innerHTML = postData.age;
$(tr).append(tdAge); var tdGender = document.createElement('td');
if (postData.gender == "") {
tdGender.innerHTML = 'False';
} else {
tdGender.innerHTML = 'True';
}
$(tr).append(tdGender); var tdClass = document.createElement('td');
var text = $('select[name="cls_id"]').find('option[value="' + postData.cls_id + '"]').text();
tdClass.innerHTML = text;
$(tr).append(tdClass); var tdHandle = '<td><a class="glyphicon glyphicon-remove icon del-row"></a><a class="fa fa-pencil-square-o icon edit-row"></a></td>';
$(tr).append(tdHandle); $('#tb').append(tr);
} </script>
</body>
</html>
student.html
from django.http import HttpResponse
from django.shortcuts import render # Create your views here.
from app01 import models
import json def student(request):
cla_list = models.Classes.objects.all()
stu_list = models.Student.objects.all()
return render(request , 'student.html' , {'stu_list': stu_list , 'cla_list': cla_list}) def add_student(request):
response = {'status': True , 'message': None , 'data': None}
try:
u = request.POST.get('username')
a = request.POST.get('age')
g = request.POST.get('gender')
c = request.POST.get('cls_id') obj = models.Student.objects.create(
username=u ,
age=a ,
gender=g ,
cs_id=c ,
) response['data'] = obj.id except Exception as e:
response['status'] = False
response['message'] = '用户输入错误' result = json.dumps(response)
return HttpResponse(result) def del_student(request):
ret = {'status': True}
try:
nid = request.GET.get('nid')
models.Student.objects.filter(id=nid).delete()
except Exception as e:
ret['status'] = False
return HttpResponse(json.dumps(ret)) def edit_student(request):
response = {'code': 1000 , 'message': None}
try:
nid = request.POST.get('nid')
u = request.POST.get('user')
a = request.POST.get('age')
g = request.POST.get('gender')
c = request.POST.get('cls_id')
models.Student.objects.filter(id=nid).update(
username=u ,
age=a ,
gender=g ,
cs_id=c ,
)
except Exception as e:
response['code']=1001
response['message']=str(e)
return HttpResponse(json.dumps(response))
views.py
paging
分页组件
a.内置
b.扩展
c.自定义
f1.html <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
{% csrf_token %}
<form id="fm" action="/f1.html/" method="post">
<p>{{ obj.user }}{{ obj.errors.user.0 }}</p>
<p>{{ obj.pwd }}{{ obj.errors.pwd.0 }}</p>
<p>{{ obj.age }}{{ obj.errors.age.0 }}</p>
<p>{{ obj.email }}{{ obj.errors.email.0 }}</p>
<p><input type="submit" value="提交"/></p>
</form> </body>
</html> index1.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body> <ul>
{% for user in user_list %}
<li>{{ user.name }}-{{ user.age }}</li>
{% endfor %}
</ul>
{#边界问题#}
<a href="/index.html?p={{ prev_pager }}">上一页</a>
<a href="/index.html?p={{ next_pager }}">下一页</a> </body>
</html>
index1.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body> <ul>
{% for user in posts.object_list %}
<li>{{ user.name }}-{{ user.age }}</li>
{% endfor %}
</ul>
{% include 'include/pager.html' %} </body>
</html> index2.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" href="/static/plugins/bootstrap/css/bootstrap.css">
</head>
<body> <ul>
{% for row in data %}
<li>{{ row.name }}-{{ row.age }}</li>
{% endfor %}
</ul>
{% for i in page_obj.pager_num_rang%}
<a href="/index2.html?p={{ i }}">{{ i }}</a>
{% endfor %}
<hr/> <ul class="pagination pagination-sm"> {{ page_obj.page_str|safe }} </ul> </body>
</html>
templates
from django.shortcuts import render
from django.core.paginator import Paginator , EmptyPage , PageNotAnInteger # Create your views here. USER_LIST = []
for i in range(1 , 666):
temp = {'name': 'root' + str(i) , 'age': i}
USER_LIST.append(temp) def index(request):
per_page_count = 10
current_page = request.GET.get('p')
current_page = int(current_page)
start = (current_page - 1) * per_page_count
end = current_page * per_page_count
data = USER_LIST[start:end] prev_pager = current_page - 1
next_pager = current_page + 1 if current_page <= 1:
prev_pager = 1 return render(request , 'index.html' , {
'user_list': data ,
'current_page': current_page ,
'prev_pager': prev_pager ,
'next_pager': next_pager ,
}) class CustomPaginator(Paginator):
def __init__(self , current_page , per_pager_num , *args , **kwargs):
# 当前页
self.current_page = int(current_page)
# 最多显示的页码数量11
self.per_page_num = int(per_pager_num)
super(CustomPaginator , self).__init__(*args , **kwargs) def pager_num_rang(self):
# 总页数
if self.num_pages < self.per_page_num:
return range(1 , self.num_pages + 1) # 总页数特别多 5
part = int(self.per_page_num / 2) if self.current_page <= part:
return range(1 , self.per_page_num + 1) if (self.current_page + part) > self.num_pages:
return range(self.num_pages - self.per_page_num + 1 , self.num_pages + 1) return range(self.current_page - part , self.current_page + part + 1) def index1(request):
# 全部数据：USER_LIST，==》得出共有多少条数据
# per_page: 每页显示条目数量
# count: 数据总个数
# num_pages:总页数
# page_range:总页数的索引范围，如: (1,10),(1,200)
# page: page对象（是否具有下一页；是否具有上一页；）
current_page = request.GET.get('p')
# Paginator对象
paginator = CustomPaginator(current_page , 7 , USER_LIST , 10)
try:
# Page 对象
posts = paginator.page(current_page)
# has_next 是否有下一页
# next_page_number 下一页页码
# has_previous 是否有上一页
# previous_page_number 上一页页码
# object_list 分页之后的数据列表
# number 当前页
# paginator paginator对象
except PageNotAnInteger:
posts = paginator.page(1)
except EmptyPage:
posts = paginator.page(paginator.num_pages)
return render(request , 'index1.html' , {'posts': posts}) def index2(request):
from app01.pager import Pagination
current_page = request.GET.get('p')
page_obj = Pagination(666 , current_page) data_list = USER_LIST[page_obj.start():page_obj.end()]
return render(request , 'index2.html' , {'data': data_list , 'page_obj': page_obj})
views.py
class Pagination(object):
def __init__(self , totalCount , currentPage , perPageNum=10 , maxPageNum=6):
# 数据总个数
self.total_count = totalCount
# 当前页
try:
v = int(currentPage)
if v < 0:
v = 1
self.current_page = v
except Exception as e:
self.current_page = 1
# 每页显示的行数
self.per_page_item_num = perPageNum
# 最多显示页面
self.max_page_num = maxPageNum def start(self):
return (self.current_page - 1) * self.per_page_item_num def end(self):
return self.current_page * self.per_page_item_num @property
def num_pages(self):
'''
总页数
:return:
'''
# 666
# 10
a , b = divmod(self.total_count , self.per_page_item_num)
if b == 0:
return a
return a + 1 def pager_num_rang(self):
# 总页数
if self.num_pages < self.max_page_num:
return range(1 , self.num_pages + 1)
# 总页数特别多 5
part = int(self.max_page_num / 2)
if self.current_page <= part:
return range(1 , self.max_page_num + 1)
if (self.current_page + part) > self.num_pages:
return range(self.num_pages - self.max_page_num + 1 , self.num_pages + 1)
return range(self.current_page - part , self.current_page + part + 1) def page_str(self):
page_list = []
first = '<li><a href="/index2.html?p=1">首页</a></li>'
page_list.append(first)
if self.current_page == 1:
prev = "<li><a href='#'>上一页</a></li>"
else:
prev = "<li><a href='/index2.html?p=%s'>上一页</a></li>" % (self.current_page - 1 ,)
page_list.append(prev)
for i in self.pager_num_rang():
if i == self.current_page:
temp = "<li class='active' ><a href='/index2.html?p=%s'>%s</a></li>" % (i , i)
else:
temp = "<li><a href='/index2.html?p=%s'>%s</a></li>" % (i , i)
page_list.append(temp)
if self.current_page == self.num_pages:
nex = "<li><a href='#'>下一页</a></li>"
else:
nex = "<li><a href='/index2.html?p=%s'>下一页</a></li>" % (self.current_page + 1)
page_list.append(nex)
last = '<li><a href="/index2.html?p=%s">尾页</a></li>' % (self.num_pages)
page_list.append(last)
return ''.join(page_list)
pager.py
Form
from django.http import HttpResponse
from django.shortcuts import render
from django.shortcuts import redirect
from django import forms
from django.forms import fields # Create your views here. class F1Form(forms.Form):
user = fields.CharField(
max_length=18 ,
min_length=6 ,
required=True ,
error_messages={
'required': '用户名不能为空',
'max_length': '太长了',
'min_length': '太短了',
}
)
pwd = fields.CharField(min_length=32 , required=True)
age = fields.IntegerField(
required=True ,
error_messages={
'required': '年龄不能为空',
'invalid': '必须为数字', }
)
email = fields.EmailField(
required=True ,
min_length=8 ,
error_messages={
'required': '邮箱不能为空',
'invalid': '邮箱格式错误',
}
) def f1(request):
if request.method == 'GET':
obj=F1Form()
return render(request , 'f1.html',{'obj':obj})
else:
# u = request.POST.get('user')#不能为空，长度6-18
# p = request.POST.get('pwd')#不能为空，长度32
# e = request.POST.get('email')#不能为空，邮箱格式
# a = request.POST.get('age')#不能为空，数字类型
# 1、检查是否为空
# 2、检查格式是否正确 obj = F1Form(request.POST)
# 是否全部验证成功
if obj.is_valid():
# 用户提交的数据
print('验证成功' , obj.cleaned_data)
return redirect('http://www.xiaohuar.com')
else:
print('验证失败' , obj.errors)
return render(request , 'f1.html' , {'obj': obj})
views.py
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
{% csrf_token %}
<form id="fm" action="/f1.html/" method="post">
<p>{{ obj.user }}{{ obj.errors.user.0 }}</p>
<p>{{ obj.pwd }}{{ obj.errors.pwd.0 }}</p>
<p>{{ obj.age }}{{ obj.errors.age.0 }}</p>
<p>{{ obj.email }}{{ obj.errors.email.0 }}</p>
<p><input type="submit" value="提交"/></p>
</form> </body>
</html>
f1.html
作用：验证+（生成HTML+保存上次提交的数据）
使用：
1、创建类
2、创建字段（）
3、验证用户输入：
obj=Form(request.POST,request.FILES)
if obj.is_valid():
obj.cleaned_data
else:
obj.errors
4、clean_字段 5、clean() _post_clean() PS:__all__ 整体错误信息
1.form类的运行顺序是init，clean，validte，save
其中clean和validate会在form.is_valid()方法中被先后调用。(这里留有一个疑问，结构完全相同的两个form，但是一个为先验证后clean，另一个先clean后验证。原因不明。)
这里https://docs.djangoproject.com/en/dev/ref/forms/validation/给的是先验证后clean
2.cleaned_data中的值类型与字段定义的Field类型一致。
如果字段定义charfield，那么clean方法返回的cleaned_data中对应的字段值就是字符型，
定义为ModelChoiceField，则cleaned_data中字段值是某个model实例。
定义为ModelMultipleChoiceField，则cleaned_data中字段值是个model实例list。
3.clean等步骤遇到的异常：Exception Value: argument of type 'NoneType' is not iterable.
可能是cleaned_data中某个字段值应该是个列表，实际上却是空值。
4.ModelForm的Meta类中定义的fields
默认的Field是Model中定义的Field，如需更改，可在Form类内以同名字段覆盖，比如自定义widget和required属性等。
不管字段在form中怎么自定义，cleaned_data中对应的值都必须按照model中定义的字段类型取值，否则校验不通过或保存时报错。
暂时记这几条，form还可以重写init、save方法，并且可以自定义方法。如果对这几个东西不懂，想办法找例子读一遍就懂了。
※※※ clean方法重写时一定不要忘了return cleaned_data ※※※
补充：
5.form的四种初始化方式
①实例化oneform(initial={'onefield':value})
②定义字段时给初始化值oneformfield = forms.CharField(initial=value)
③重写Form类的__init__()方法：self.fields['onefield'].initial = value
④当给form传参instanse(即oneform(instanse=onemodel_instance))时，前三种初始化方法会全部失效，即使重写__init__时，先调用父类的__init__再使用方法③，仍然无效(不是很爽)。
这时想重新初始化字段值只能在__init__()里 self.initial['title'] = value，直接对Form类的initial属性字典赋值。
序列化
JavaScript:
JSON.parse()
JSON.stringify()
Django:
json.dumps()
json.loads()
问题：
serialize : model.TB.objects.all()
json : list(model.TB.objects.values())
json : list(model.TB.objects.value_list())
文件上传
from django.http import HttpResponse
from django.shortcuts import render
from django.forms import fields
from django import forms class UploadForm(forms.Form):
user = fields.CharField()
img = fields.FileField() # Create your views here.
def upload(request):
if request.method == "GET":
return render(request , 'upload.html') else:
# obj=UploadForm(request.POST,request.FILES)
# if obj.is_valid():
# user=obj.cleaned_data['user']
# img=obj.cleaned_data['img'] img = request.FILES.get('img')
# img是对象（文件大小，文件名称，文件内容。。。）
user = request.FILES.get('img') f = open(img.name , 'wb')
for line in img.chunks():
f.write(line)
f.close()
return HttpResponse('ok')
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body> <form action="/upload.html" method="post" enctype="multipart/form-data">
{% csrf_token %}
<input type="text" name="user">
<div style="position:relative">
<a href="">upload</a>
<input type="file" name="img" style="opacity: 0;position: absolute;top: 0;left: 0">
</div>
<input type="submit" value="提交">
</form> </body>
</html>
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