在表单提交前进行验证的几种方式 .
在Django中，为了减轻后台压力，可以利用JavaScript在表单提交前对表单数据进行验证。下面提供了有效的几种方式（每个.html文件为一种方式）。
formpage1.html
复制代码 代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Example1</title>
<script type="text/javascript" src="/UploadFiles/2021-04-02/jquery-1.4.1.js"><script type="text/javascript">
function jump()
{
//清空表单所有数据
document.getElementById("firstname").value=""
document.getElementById("lastname").value=""
$("#firstnameLabel").text("")
$("#lastnameLabel").text("")
}
$(document).ready(function(){
$("#form1").bind("submit", function(){
var txt_firstname = $.trim($("#firstname").attr("value"))
var txt_lastname = $.trim($("#lastname").attr("value"))
$("#firstnameLabel").text("")
$("#lastnameLabel").text("")
var isSuccess = 1;
if(txt_firstname.length == 0)
{
$("#firstnameLabel").text("firstname不能为空！")
$("#firstnameLabel").css({"color":"red"});
isSuccess = 0;
}
if(txt_lastname.length == 0)
{
$("#lastnameLabel").text("lastname不能为空！")
$("#lastnameLabel").css({"color":"red"});
isSuccess = 0;
}
if(isSuccess == 0)
{
return false;
}
})
})
</script>
</head>
<body>
提交表单前进行验证(方法一)
<hr width="40%" align="left" />
<form id="form1" method="post" action="/DealWithForm1/">
<table>
<tr>
<td>first_name:</td>
<td><input name="firstname" type="text" id="firstname" /></td>
<td><label id="firstnameLabel"></label></td>
</tr>
<tr>
<td>last_name:</td>
<td><input name="lastname" type="text" id="lastname" /></td>
<td><label id="lastnameLabel"></label></td>
</tr>
</table>
<hr width="40%" align="left" />
<button type="submit">提交</button>
<button type="button" onclick="jump();">取消</button>
</form>
</body>
</html>
formpage2.html
复制代码 代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Example2</title>
<script type="text/javascript" src="/UploadFiles/2021-04-02/jquery-1.4.1.js"><script type="text/javascript">
function jump()
{
//清空表单所有数据
document.getElementById("firstname").value=""
document.getElementById("lastname").value=""
$("#firstnameLabel").text("")
$("#lastnameLabel").text("")
}
function check(){
var txt_firstname = $.trim($("#firstname").attr("value"))
var txt_lastname = $.trim($("#lastname").attr("value"))
$("#firstnameLabel").text("")
$("#lastnameLabel").text("")
var isSuccess = 1;
if(txt_firstname.length == 0)
{
$("#firstnameLabel").text("firstname不能为空！")
$("#firstnameLabel").css({"color":"red"});
isSuccess = 0;
}
if(txt_lastname.length == 0)
{
$("#lastnameLabel").text("lastname不能为空！")
$("#lastnameLabel").css({"color":"red"});
isSuccess = 0;
}
if(isSuccess == 0)
{
return false;
}
return true;
}
</script>
</head>
<body>
提交表单前进行验证(方法二)
<hr width="40%" align="left" />
<form id="form1" method="post" action="/DealWithForm1/" onsubmit="return check()">
<table>
<tr>
<td>first_name:</td>
<td><input name="firstname" type="text" id="firstname" /></td>
<td><label id="firstnameLabel"></label></td>
</tr>
<tr>
<td>last_name:</td>
<td><input name="lastname" type="text" id="lastname" /></td>
<td><label id="lastnameLabel"></label></td>
</tr>
</table>
<hr width="40%" align="left" />
<button type="submit">提交</button>
<button type="button" onclick="jump();">取消</button>
</form>
</body>
</html>
formpage3.html
复制代码 代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Example3</title>
<script type="text/javascript" src="/UploadFiles/2021-04-02/jquery-1.4.1.js"><script type="text/javascript">
function jump()
{
//清空表单所有数据
document.getElementById("firstname").value=""
document.getElementById("lastname").value=""
$("#firstnameLabel").text("")
$("#lastnameLabel").text("")
}
function checktosubmit(){
var txt_firstname = $.trim($("#firstname").attr("value"))
var txt_lastname = $.trim($("#lastname").attr("value"))
$("#firstnameLabel").text("")
$("#lastnameLabel").text("")
var isSuccess = 1;
if(txt_firstname.length == 0)
{
$("#firstnameLabel").text("firstname不能为空！")
$("#firstnameLabel").css({"color":"red"});
isSuccess = 0;
}
if(txt_lastname.length == 0)
{
$("#lastnameLabel").text("lastname不能为空！")
$("#lastnameLabel").css({"color":"red"});
isSuccess = 0;
}
if(isSuccess == 1)
{
form1.submit();
}
}
</script>
</head>
<body>
提交表单前进行验证(方法三)
<hr width="40%" align="left" />
<form id="form1" method="post" action="/DealWithForm1/">
<table>
<tr>
<td>first_name:</td>
<td><input name="firstname" type="text" id="firstname" /></td>
<td><label id="firstnameLabel"></label></td>
</tr>
<tr>
<td>last_name:</td>
<td><input name="lastname" type="text" id="lastname" /></td>
<td><label id="lastnameLabel"></label></td>
</tr>
</table>
<hr width="40%" align="left" />
<button type="button" onclick="checktosubmit()">提交</button>
<button type="button" onclick="jump();">取消</button>
</form>
</body>
</html>
以下是视图函数、URL配置以及相关设置
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views.py
复制代码 代码如下:
#coding: utf-8
from django.http import HttpResponse
from django.shortcuts import render_to_response
def DealWithForm1(request):
if request.method=="POST":
FirstName=request.POST.get('firstname','')
LastName=request.POST.get('lastname','')
if FirstName and LastName:
response=HttpResponse()
response.write("<html><body>"+FirstName+" "+LastName+u"！ 你提交了表单！</body></html>")
return response
else:
response=HttpResponse()
response.write('<html><script type="text/javascript">alert("firstname或lastname不能为空！");\
window.location="/DealWithForm1"</script></html>')
return response
else:
return render_to_response('formpage1.html')
def DealWithForm2(request):
if request.method=="POST":
FirstName=request.POST.get('firstname','').encode("utf-8")
LastName=request.POST.get('lastname','').encode("utf-8")
if FirstName and LastName:
html="<html><body>"+FirstName+" "+LastName+"！ 你提交了表单！"+"</body></html>"
return HttpResponse(html)
else:
response=HttpResponse()
response.write('<html><script type="text/javascript">alert("firstname或lastname不能为空！");\
window.location="/DealWithForm2"</script></html>')
return response
else:
return render_to_response('formpage2.html')
def DealWithForm3(request):
if request.method=="POST":
FirstName=request.POST.get('firstname','')
LastName=request.POST.get('lastname','')
if FirstName and LastName:
response=HttpResponse()
response.write('<html><body>'+FirstName+LastName+u'！ 你提交了表单！</body></html>')
return response
else:
response=HttpResponse()
response.write('<html><script type="text/javascript">alert("firstname或lastname不能为空！");\
window.location="/DealWithForm3"</script></html>')
return response
else:
return render_to_response('formpage3.html')
urls.py
复制代码 代码如下:
from django.conf.urls.defaults import patterns, include, url
import views
from django.conf import settings
urlpatterns = patterns('',
url(r'^Resource/(?P<path>.*)$','django.views.static.serve',{'document_root':settings.STATIC_RESOURCE}),
url(r'^DealWithForm1','views.DealWithForm1'),
url(r'^DealWithForm2','views.DealWithForm2'),
url(r'^DealWithForm3','views.DealWithForm3'),
)
settings.py
复制代码 代码如下:
# Django settings for CheckFormBeforeSubmit project.
import os
HERE = os.path.abspath(os.path.dirname(__file__))
DEBUG = True
TEMPLATE_DEBUG = DEBUG
...
STATIC_RESOURCE=os.path.join(HERE, "resource")
...
MIDDLEWARE_CLASSES = (
'django.middleware.common.CommonMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.csrf.CsrfResponseMiddleware',
)
ROOT_URLCONF = 'CheckFormBeforeSubmit.urls'
TEMPLATE_DIRS = (
os.path.join(HERE,'template'),
# Put strings here, like "/home/html/django_templates" or "C:/www/django/templates".
# Always use forward slashes, even on Windows.
# Don't forget to use absolute paths, not relative paths.
)
...