基于教务系统写的
1.form表单select选择框数据左右移动
models.teacher.objects.filter(name="root") #查找name=root的数据
models.teacher.objects.exclude(name="root")#查找name!=root的数据
models.teacher.objects.filter(id__in=[1,2,3])#查找id在[1,2,3]的数据
models.teacher.objects.exclude(id__in=[1,2,3])#查找id不在[1,2,3]的数据
(2)jQuery对象和DOM对象相互转换:
var obj=document.getElementById('sel') //DOM对象
$('obj') //DOM对象转换成JQuery对象
$('#sel') //JQuery对象
$('#sel')[0] //JQuery对象转换成DOM对象
(3)获取select中的信息:
select标签的Dom对象中有 selectedOptions (找到数据) appendTo (移走数据,移到想要移动的地方)
(4)实际操作代码:
<!-- 前端代码块 -->
<form action="/edit_teacher-{{ obj.id }}/" method="POST">
<input style="display: none" type="text" id="nid" value="{{ obj.id }}"/>
<p>
老师姓名:<input name="name" type="text" value="{{ obj.teachername }}"/>
</p>
<p>
已管理班级:
<select id="sel" name="cls" multiple>
{% for foo in obj_list %}
<option value="{{ foo.0 }}" selected="selected">{{ foo.1 }}</option>
{% endfor %}
</select>
未管理班级:
<select id="sels" multiple>
{% for foo in cls_list %}
<option value="{{ foo.id }}">{{ foo.classname }}</option>
{% endfor %}
</select>
</p>
<div class="">
<a id="add_cla" style="font-size: 30px;cursor: pointer">+</a>
<a id="delete_cla" style="font-size: 30px;cursor: pointer">-</a>
</div>
<br><input type="submit" value="提交">
</form>
//js代码部分
<script>
$(function(){
bindadd_cla();
binddelete_cla();
bindSubmit();
});
function bindSubmit() {
$("#submit_form").click(function(){
$('#sel').children().each(function(){
$(this).prop("selected",true);
})
})
};
function binddelete_cla(){
$("#delete_cla").click(function(){
var options = $('#sel')[0].selectedOptions;
//$.each(options,function(k,v){ //each循环每次移动一个就立即停止了
// $(v).appendTo("#sels");
//});
while (options.length>0){
$(options[0]).appendTo("#sels");
};
})
};
function bindadd_cla(){
$("#add_cla").click(function(){
var options = $('#sels')[0].selectedOptions;
while (options.length>0){
$(options[0]).appendTo("#sel");
};
})
};
</script>
#后端代码块
if request.method == "GET":
#已选择的教师的id
obj = models.teacher.objects.get(id=nid)
#获取当前老师已经管理的所有班级
obj_list=obj.cls.all().values_list("classid","classname")#元组
print(obj_list)
#已经管理的班级的ID列表
id_list = list(zip(*obj_list))[0] if obj_list else [] #三元运算
#获取不包括已经管理的班级
cls_list=models.classes.objects.exclude(classid__in=id_list)
return render(request,"edit_teacher.html",{"obj":obj,"cls_list":cls_list,"obj_list":obj_list})
2.From表单上传文件
注:使用form表单上传文件时必须要在form标签中添加encty属性:enctype="multipart/form-data"
<!-- 前端代码块 -->
{% extends "index.html" %}
{% block right %}
<form action="/upload/" method="post" enctype="multipart/form-data" style="margin-top: 60px;margin-left: 10%">
上传者:<input type="text" name="username" style="margin-top: 20px;"><br>
<input type="file" name="files" style="margin-top: 20px;"><br>
<input type="submit" value="提交" style="margin-top: 20px;">
</form>
<div class="show" style="margin-top: 30px;margin-left: 10%;overflow: hidden">
<h3>文件展示</h3>
{% for foo in img_list %}
<div class="files" style="float: left;margin-left: 8px;">
<p>filter:{{ foo.filter }}</p>
<p><img src="/{{ foo.path }}" style=" 100px;height: 100px"/><p>
</div>
{% endfor %}
</div>
{% endblock %}
//数据库代码块
class teacher(models.Model):
teachername=models.CharField(max_length=64)
cls = models.ManyToManyField('Classes')
#文件上传(Form表单)
def upload(request):
if request.method == "GET":
img_list = models.imagesurl.objects.all()
return render(request,"upload.html",{"img_list":img_list})
elif request.method == "POST":
username = request.POST.get("username",None)
#filesname = request.POST.get("files")
file = request.FILES.get("files")
import os
path = os.path.join('statics', 'upload', file.name)
f = open(path,'wb')
for chunk in file.chunks():
f.write(chunk)
f.close()
models.imagesurl.objects.create(filter=username,path=path)
return redirect("/upload/")
3.Ajax上传文件(FromData——(JQuery,XMLHttpRequest))
<!-- 前端代码块 -->
{% extends "index.html" %}
{% block right %}
<div class="upload" style="margin-top: 60px;margin-left: 10%">
上传者:<input type="text" name="username" style="margin-top: 20px;"><br>
<input type="file" id="upfile" style="margin-top: 20px;"><br>
<input type="button" value="XML提交" style="margin-top: 20px;" onclick="bindxml()">
<input type="button" value="ajax提交" style="margin-top: 20px;" onclick="bindjq()">
</div>
<div class="show" id="show" style="margin-top: 30px;margin-left: 10%;overflow: hidden">
<h3>FormData文件展示(xmlhttprequest和jquery)</h3>
{% for foo in img_list %}
<div class="files" id="images" style="float: left;margin-left: 8px;">
<p>filter:{{ foo.filter }}</p>
<p><img src="/{{ foo.path }}" style=" 100px;height: 100px"/><p>
</div>
{% endfor %}
</div>
<script>
//XMLReques方式(原生ajax)
function bindxml(){
var dic = new FormData();
//console.log(user);
//alert(user);
var user=document.getElementsByName('username')[0].value;
//alert(user);
//console.log(user);
dic.append('username',user);
dic.append('files',document.getElementById('upfile').files[0]);
var xml = new XMLHttpRequest();
xml.open('post','/uploadformdata/',true);
xml.onreadystatechange = function(){
if(xml.readyState == 4){
var obj = JSON.parse(xml.responseText);
if(obj.status){
//console.log(obj.path);
var img = document.createElement('img');
img.src = "/"+obj.path;
img.style = " 100px;height: 100px";
document.getElementById("images").appendChild(img);
}
}
};
xml.send(dic);
};
//JQuery(封装ajax)
function bindjq(){
var dic = new