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jquery前台校验最大值 javascript校验
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jquery在表单提交前有几种校验方法
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" ""
html xmlns=""
head
meta http-equiv="Content-Type" content="text/html; charset=utf-8" /
titleExample1/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
tdfirst_name:/td
tdinput name="firstname" type="text" id="firstname" //td
tdlabel id="firstnameLabel"/label/td
/tr
tr
tdlast_name:/td
tdinput name="lastname" type="text" id="lastname" //td
tdlabel 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" ""
html xmlns=""
head
meta http-equiv="Content-Type" content="text/html; charset=utf-8" /
titleExample2/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
tdfirst_name:/td
tdinput name="firstname" type="text" id="firstname" //td
tdlabel id="firstnameLabel"/label/td
/tr
tr
tdlast_name:/td
tdinput name="lastname" type="text" id="lastname" //td
tdlabel 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" ""
html xmlns=""
head
meta http-equiv="Content-Type" content="text/html; charset=utf-8" /
titleExample3/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
tdfirst_name:/td
tdinput name="firstname" type="text" id="firstname" //td
tdlabel id="firstnameLabel"/label/td
/tr
tr
tdlast_name:/td
tdinput name="lastname" type="text" id="lastname" //td
tdlabel 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
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("htmlbody"+FirstName+" "+LastName+u"！ 你提交了表单！/body/html")
return response
else:
response=HttpResponse()
response.write('htmlscript 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="htmlbody"+FirstName+" "+LastName+"！ 你提交了表单！"+"/body/html"
return HttpResponse(html)
else:
response=HttpResponse()
response.write('htmlscript 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('htmlbody'+FirstName+LastName+u'！ 你提交了表单！/body/html')
return response
else:
response=HttpResponse()
response.write('htmlscript 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/(?Ppath.*)$','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.
)
相关问答
Q1: 请教Jquery和Js支持的数字最大长度一致吗
1：jQuery是一个封装了JS Dom的一个插件，其底层代码还是JavaScript
2：ECMAScript中的最小数值保存在Number.MIN_VALUE中，这个值一般是5e-324，最大值保存在Number.MAX_VALUE中，这个值一般是1.7976931348623157e+308。如果某次计算超出了Javascript的数值范围，则这个数值自动转换成特殊的Infinity值，正值为Infinity,负值位-Infinity。
3：1.7976931348623157e+308数值中的“e”是代表指数的意思。
1.7976931348623157e+308也就是1.7976931348623157乘以10的308次方。最终结果是：17976931348623157后面有292个0
Q2: JS或Jquery根据要求求出最大值问题
var tempData={};
var data=[{id1:1,id2:2},{id1:1,id2:0}];
for(var i=0;idata.lengh;i++){
if(!tempData[data[i].id1]){
tempData[data[i].id1]={data[i].id2:1};
tempData[data[i].id1]["_max"]=1;
}else if(!tempData[data[i].id1][data[i].id2]){
tempData[data[i].id1][data[i].id2]=1;
}else{
tempData[data[i].id1][data[i].id2]+=1;
}
if(tempData[data[i].id1]["_max"]tempData[data[i].id1][data[i].id2]){
tempData[data[i].id1]["_max"]=tempData[data[i].id1][data[i].id2];
}
}
var str='';
for(pro in tempData){
str+="("+pro+":"+tempData[pro]["_max"]+"),";
}
console.log(str);
alert(str);
Q3: JS或者Jquery如何取得横向和纵向滚动条的最大可以滚动的值？
需要准备的材料分别有：电脑、html编辑器、浏览器。
1、首先，打开html编辑器，新建html文件，例如：index.html，并引入jquery。
2、在index.html中的script标签，输入jquery代码：
$('body').append('height: ' + $(document).height() + 'br/');
$('body').append('width: ' + $(document).width());
3、浏览器运行index.html页面，此时会打印出界面最大可以滚动的文档宽度和文档高度。
Q4: 用jquery如何取指定字段的值？
function get_max()
{
var max=0;
$('a').each(function(){
var href = $(this).attr('href');
var reg = /\/sz\/dg\/(\d+)\//;
var num = reg.exec(href);
if (!num) return;
num = parseInt(num[1]);
if ( num = max )
{
max = num;
}
});
return max;
}
//这就是最大值
alert(get_max());
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