js验证表单大全

js验证表单大全

 1. 长度限制

 <script>

 function test() 

{

 if(document.a.b.value.length>50)

 {

 alert("不能超过50个字符！");

 document.a.b.focus();

 return false;

 }

 }

 </script>

 <form name=a>

 <textarea name="b" cols="40" wrap="VIRTUAL" rows="6"></textarea>

 <input type="submit" name="Submit" value="check">

 </form> 

2. 只能是汉字 

<input/oblog/value.replace(/[^\u4E00-\u9FA5]/g,'')">

 3." 只能是英文

 <script language=javascript>

 function onlyEng()

 {

 if(!(event.keyCode>=65&&event.keyCode<=90))

 event.returnvalue=false;

 }

 </script>

 <input>

 4. 只能是数字

 <script language=javascript>

 function onlyNum()

 {

 if(!((event.keyCode>=48&&event.keyCode<=57)||(event.keyCode>=96&&event.keyCode<=105)))

 //考虑小键盘上的数字键

 event.returnvalue=false;

 }

 </script>

 <input>

 5. 只能是英文字符和数字

 <input/oblog/value.replace(/[\W]/g,"'') "onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">

 6. 验证油箱格式

 <SCRIPT LANGUAGE=javascript RUNAT=Server>

 function isEmail(strEmail) {

 if (strEmail.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1)

 return true;

 else

 alert("oh");

 }

 </SCRIPT>

 <input type=text onblur=isEmail(this.value)>

 7. 屏蔽关键字(这里屏蔽***和****)

 <script language="javascript1.2">

 function test() {

 if((a.b.value.indexOf ("***") == 0)||(a.b.value.indexOf ("****") == 0)){

 alert("");

 a.b.focus();

 return false;}

 }

 </script>

 <form name=a>

 <input type=text name=b>

 <input type="submit" name="Submit" value="check">

 </form>

 8. 两次输入密码是否相同

 <FORM METHOD=POST ACTION="">

 <input type="password" id="input1">

 <input type="password" id="input2">

 <input type="button" value="test">

 </FORM>

 <script>

 function check()

 { 

with(document.all){

 if(input1.value!=input2.value)

 {

 alert("false")

 input1.value = "";

 input2.value = "";

 }

 else document.forms[0].submit();

 }

 }

 </script>

 路政管理系统应用：

 //非空验证

 function checkoname(){

 var casename= document.all['caseInfo.casename'].value;

 if(casename==""){

   alert("案由不能为空！请输入执法机构");

   casename.focus();

   return false;

 }

   return true;

 }

 //机构简称非空验证

 function checkcpunishbase(){

 var cpunishbase=document.all['caseInfo.cpunishbase'].value;

 if(cpunishbase==""){

   alert("处罚依据不能为空！请输入机构简称");

   cpunishbase.focus();

   return false;

 }

   return true;

 }