js验证表单大全1

附加：js验证radio是否选择

<script language="javascript">

function checkform(obj)

{

for(i=0;i<obj.oo.length;i++)

         if(obj.oo[i].checked==true) return true;

alert("请选择")

return false;        

}

</script>

<form id="form1" name="form1" method="post" action=""   onsubmit="return checkform(this)">

   <input type="radio" name="oo" value="radiobutton" />

   <input type="radio" name="oo" value="radiobutton" />

   <input type="submit" name="Submit" value="提交" />

</form>

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 onsubmit="return test()">

<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 onkeyup="value="/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 onkeydown="onlyEng();">

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 onkeydown="onlyNum();">

5. 只能是英文字符和数字

<input onkeyup="value="/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 onsubmit="return test()">

<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" onclick="check()">

</FORM>

<script>

function check()

{ 

with(document.all){

if(input1.value!=input2.value)

{

alert("false")

input1.value = "";

input2.value = "";

}

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

}

}

</script>