Python全栈之路-Django（四）
bootstrap http://v3.bootcss.com/
fontawesome http://fontawesome.io/
1 利用js阻止默认事件的触发
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<div>
<a href="http://www.baidu.com/" onclick="return func();">对话框添加</a>
<script>
function func() {
alert(123)
return true; // 默认事件会触发
return false; // 默认事件不会触发
}
</script>
</body>
</html>
2 Ajax操作
urls.py
from django.conf.urls import url
from django.contrib import admin
from app01 import views
urlpatterns = [
url(r'^admin/', admin.site.urls),
url(r'^classes/', views.classes),
url(r'^add_class/', views.add_class),
url(r'^del_class/', views.del_class),
url(r'^edit_class/', views.edit_class),
url(r'^students/', views.students),
url(r'^add_student/', views.add_student),
url(r'^del_student/', views.del_student),
url(r'^edit_student/', views.edit_student),
url(r'^modal_add_class/', views.modal_add_class),
url(r'^modal_edit_class/', views.modal_edit_class),
url(r'^modal_add_student/', views.modal_add_student),
url(r'^modal_edit_student/', views.modal_edit_student),
url(r'^teachers/', views.teachers),
]
2.1 功能1：编辑班级
app01.views.py
def modal_edit_class(request):
ret = {'status': True, 'message': None}
try:
class_id = request.POST.get('class_id')
class_name = request.POST.get('class_name').strip()
if class_name:
sqlhelper.modify(
'update class set class_name=%s where id=%s',
[class_name, class_id]
)
else:
ret['status'] = False
ret['message'] = '班级名称不能为空'
except Exception as e:
ret['status'] = False
ret['message'] = str(e)
return HttpResponse(json.dumps(ret))
templates.classes.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.hide{
display: none;
}
#shadow{
position: fixed;
left:0;
top:0;
right: 0;
bottom: 0;
background-color: black;
opacity: 0.4;
z-index: 999;
}
#modal,#editModal{
z-index: 1000;
position: fixed;
left: 50%;
top: 50%;
height: 300px;
width: 400px;
background-color: white;
margin-left: -200px;
margin-top: -150px;
}
</style>
</head>
<body>
<h1>班级列表</h1>
<div>
<a href="/add_class/">添加班级</a>
<a href="#" onclick="showModal();">对话框添加</a>
</div>
<table>
<thead>
<tr>
<th>ID</th>
<th>班级名称</th>
<th>操作</th>
</tr>
</thead>
<tbody>
{% for row in class_list %}
<tr>
<td>{{ row.id }}</td>
<td>{{ row.class_name }}</td>
<td>
<a href="/del_class/?id={{ row.id }}">删除</a>
<a href="#" onclick="return modalEdit(this);">对话框编辑</a>
<a href="/edit_class/?id={{ row.id }}">编辑</a>
</td>
</tr>
{% endfor %}
</tbody>
</table>
<div id="shadow" class="hide"></div>
<div id="modal" class="hide">
<form action="/modal_add_class/" method="post">
<p><input type="text" name="class_name" id="class_name"></p>
<input type="button" value="提交" onclick="AjaxSend();">
<input type="button" value="取消" onclick="cancleModal();">
<span id="errormsg"></span>
</form>
</div>
<div id="editModal" class="hide">
<h3>编辑框</h3>
<form action="/modal_add_class/" method="post">
<p><input type="text" name="class_name" id="edit_class_name"></p>
<p><input type="text" name="class_id" style="display: none" id="edit_class_id"></p>
<input type="button" value="提交" onclick="editAjaxSend();">
<input type="button" value="取消" onclick="cancleModal();">
<span id="errormsg"></span>
</form>
</div>
<script src="/static/jquery-3.2.1.min.js"></script>
<script>
function showModal(){
document.getElementById('shadow').classList.remove('hide');
document.getElementById('modal').classList.remove('hide');
}
function cancleModal() {
document.getElementById('shadow').classList.add('hide');
document.getElementById('modal').classList.add('hide');
document.getElementById('editModal').classList.add('hide');
}
function AjaxSend() {
$.ajax({
url: '/modal_add_class/', // 提交地址
type: 'POST', // 提交方式
data: {'class_name': $('#class_name').val()}, // 提交数据
success: function (data) { // 当服务端处理完成后，返回数据时，该函数自动调用
// data 为返回的数据
if(data == 'ok'){
{# location.href='/classes/';#}
location.reload();
}else{
$('#errormsg').text(data);
}
}
})
}
function modalEdit(self) {
document.getElementById('shadow').classList.remove('hide');
document.getElementById('editModal').classList.remove('hide');
/*
1.获取当前标签
2.当前标签父标签的上方的标签
3.获取当前行班级名，放入编辑框
*/
var row = $(self).parent().prevAll();
var content = $(row[0]).text();
$('#edit_class_name').val(content);
var class_id=$(row[1]).text();
$('#edit_class_id').val(class_id)
}
function editAjaxSend() {
var class_id = $('#edit_class_id').val();
var class_name = $('#edit_class_name').val();
$.ajax({
url:'/modal_edit_class/',
type:'POST',
data: {'class_id':class_id,'class_name':class_name},
success:function (arg) {
// arg 是字符串类型
// JSON.parse(字符串) => 对象
// JSON.stringify(对象) => 字符串
arg = JSON.parse(arg);
if(arg.status){
location.reload();
}else{
alert(arg.message);
}
}
})
}
</script>
</body>
</html>
2.2 学生操作：
2.2.1 功能1：添加学生
app01.views.py
def students(request):
student_list = sqlhelper.get_list(
'select student.id,student.student_name,class.class_name \
from student left join class on student.class_id=class.id \
order by id;',
[]
)
class_list = sqlhelper.get_list(
'select id,class_name from class;',
[]
)
return render(request, 'students.html', {'student_list': student_list, 'class_list': class_list})
def modal_add_student(request):
ret = {'status': True, 'message': None}
try:
student_name = request.POST.get('student_name').strip()
class_id = request.POST.get('class_id')
print(student_name, class_id)
if student_name:
sqlhelper.modify(
'insert into student(student_name,class_id) values(%s,%s)',
[student_name, class_id, ]
)
else:
ret['status'] = False
ret['message'] = '学生姓名不能为空'
return HttpResponse(json.dumps(ret))
except Exception as e:
ret['status'] = False
ret['message'] = str(e)
return HttpResponse(json.dumps(ret))
templates.students.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.shadow{
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
background-color: black;
opacity: 0.3;
z-index: 999;
}
.add_modal,.edit_modal{
position: fixed;
top: 50%;
left: 50%;
width: 400px;
height: 300px;
margin-top: -150px;
margin-left: -200px;
z-index: 1000;
background-color: white;
}
.hide{
display: none;
}
</style>
</head>
<body>
<h1>学生列表</h1>
<div>
<a href="/add_student/">添加学生</a>
<a href="#" id="addModal">对话框添加</a>
<table>
<thead>
<tr>
<td>ID</td>
<td>学生姓名</td>
<td>所属班级</td>
<td>操作</td>
</tr>
</thead>
<tbody>
{% for row in student_list %}
<tr>
<td>{{ row.id }}</td>
<td>{{ row.student_name }}</td>
<td cid="{{ row.class_id }}">{{ row.class_name }}</td>
<td>
<a href="/edit_student/?student_id={{ row.id }}">编辑</a>
<a href="#" class="modalBtnEdit">对话框编辑</a>
<a href="/del_student/?student_id={{ row.id }}">删除</a>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</div>
<div class="shadow hide"></div>
<div class="add_modal hide">
<p>
<input id="addStudentName" type="text" name="student_name" placeholder="学生姓名">
</p>
<p>班级
<select id="addClassId" name="class_id">
{% for row in class_list %}
<option value="{{ row.id }}">{{ row.class_name }}</option>
{% endfor %}
</select>
</p>
<input id="btnAdd" type="button" value="添加">
<span id="ErrorMsg"></span>
</div>
<div class="edit_modal hide">
<h1>编辑学生信息</h1>
<p>
学生姓名 <input id="editStudentName" type="text" name="student_name" placeholder="学生姓名">
<input type="text" id="editStudentId" style="display: none">
</p>
<p>班级
<select id="editClassId" name="class_id">
{% for row in class_list %}
<option value="{{ row.id }}">{{ row.class_name }}</option>
{% endfor %}
</select>
</p>
<input id="btnEdit" type="button" value="更新">
<span id="editErrorMsg"></span>
</div>
<script src="/static/jquery-3.2.1.min.js"></script>
<script>
$(function () { //当页面框架加载完成之后执行
$('#addModal').click(function () {
// JQuery绑定的事件也可以阻止默认事件发生
// return false
$('.shadow').removeClass('hide');
$('.add_modal').removeClass('hide');
});
$('#btnAdd').click(function () {
$.ajax({
url:'/modal_add_student/',
type: 'POST',
data: {'student_name': $('#addStudentName').val(),'class_id': $('#addClassId').val()},
success:function (arg) {
arg = JSON.parse(arg);
if(arg.status){
location.reload();
}else{
$('#ErrorMsg').text(arg.message);
}
}
})
});
$('.modalBtnEdit').click(function () {
$('.shadow,.edit_modal').removeClass('hide')
/*
1.获取当前标签 $(this)
*/
var tds = $(this).parent().prevAll();
var student_id = $(tds[2]).text();
var student_name = $(tds[1]).text();
var class_id = $(tds[0]).attr('cid');
{# console.log(student_id,student_name,class_id)#}
$('#editStudentName').val(student_name);
$('#editStudentId').val(student_id);
$('#editClassId').val(class_id);
});
$('#btnEdit').click(function () {
var student_id = $('#editStudentId').val();
var student_name = $('#editStudentName').val();
var class_id = $('#editClassId').val();
$.ajax({
url: '/modal_edit_student/',
type: 'POST',
data: {'student_id': student_id,'student_name': student_name,'class_id': class_id},
dataType: 'JSON', // JSON.parse(arg) 自动反序列化
success: function (arg) {
{# arg = JSON.parse(arg);#}
if (arg.status){
location.reload();
}else{
$('#editErrorMsg').text(arg.message);
}
}
})
})
})
</script>
</body>
</html>
2.2.2 功能2：编辑学生
app01.views.py
def modal_edit_student(request):
ret = {'status': True, 'message': None}
try:
student_id = request.POST.get('student_id')
student_name = request.POST.get('student_name').strip()
class_id = request.POST.get('class_id')
if student_name:
sqlhelper.modify(
'update student set student_name=%s,class_id=%s where id=%s',
[student_name, class_id, student_id]
)
else:
ret['status'] = False
ret['message'] = '学生姓名不能为空'
except Exception as e:
ret['status'] = False
ret['message'] = str(e)
return HttpResponse(json.dumps(ret))
3 多对多操作：
3.1 功能1：查看老师班级关系列表
app01.views.py
def teachers(request):
teacher_list = sqlhelper.get_list(
'select teacher.id as teacher_id,teacher.teacher_name,class.class_name \
from teacher left join teacher_class on teacher.id=teacher_class.teacher_id \
left join class on teacher_class.class_id=class.id order by teacher.id;',
[]
)
result = {}
for item in teacher_list:
teacher_id = item['teacher_id']
if item in result:
result[teacher_id]['class_name'].append(item['class_name'])
else:
result[teacher_id] = {
'teacher_id': teacher_id,
'teacher_name': item['teacher_name'],
'class_name': [item['class_name'], ]
}
return render(request, 'teachers.html', {'teacher_list': result.values()})
templates.teachers.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<h1>老师列表</h1>
<table>
<thead>
<tr>
<th>ID</th>
<th>老师姓名</th>
<th>任教班级</th>
<th>操作</th>
</tr>
</thead>
<tbody>
{% for row in teacher_list %}
<tr>
<td>{{ row.teacher_id }}</td>
<td>{{ row.teacher_name }}</td>
<td>
{% for item in row.class_name %}
<span style="display: inline-block;margin-right: 10px;">{{ item }}</span>
{% endfor %}
</td>
<td>
<a>删除</a>
<a>编辑</a>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</body>
</html>
