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

<!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="/Resource/jquery-1.4.1.js"></script>

<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

<!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="/Resource/jquery-1.4.1.js"></script>

<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

<!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="/Resource/jquery-1.4.1.js"></script>

<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



views.py

#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

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

# 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.
)
...
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