</select>
一個復(fù)選框，點擊之后一組復(fù)選框全部都選上
<input type="checkbox" name="checkA" onpropertychange="for(i=0;i<A.children.length;i++){A.children.checked=this.checked}">a
<br>
<span id="A">
<input type="checkbox" name="A1">
<input type="checkbox" name="A2">
<input type="checkbox" name="A3">
</span>
select里的option進行分類列表
<span style="position:absolute;border:1px inset #d3d6d9"><select style="margin:-2px; width:200px">
<option selected>------------請選擇------------</option>
<optgroup label="JavaScript&VBScript區(qū)">
<option>原 創(chuàng)
<option>經(jīng) 典
<optgroup label="后臺區(qū)">
<option>asp&sql
<option>php&mysql
</select></span>
提示限制輸入的字符數(shù)
<script language="JavaScript">
<!--
function SymError()
{
return true;
}
window.onerror = SymError;
function strlength(str){
var l=str.length;
var n=l
for (var i=0;i<l;i++)
{
if (str.charCodeAt(i)<0||str.charCodeAt(i)>255) n++
}
return n
}
function changebyte(value,length){
var l=strlength(value)
if (l<=length) {
if (document.all!=null) document.all("byte").innerText="還可以輸入"+(length-l)+"字節(jié)"
}
else
{
document.all("byte").innerText="輸入字節(jié)數(shù)超出范圍"
}
return true
}
function changebyte1(value,length){
var l=strlength(value)
if (l<=length) {
if (document.all!=null) document.all("byte1").innerText="還可以輸入"+(length-l)+"字節(jié)"
}
else
{
document.all("byte1").innerText="輸入字節(jié)數(shù)超出范圍"
}
return true
}
function changebyte2(value,length){
var l=strlength(value)
if (l<=length) {
if (document.all!=null) document.all("byte2").innerText="還可以輸入"+(length-l)+"字節(jié)"
}
else
{
document.all("byte2").innerText="輸入字節(jié)數(shù)超出范圍"
}
return true
}
</script>
<form method="post" name=test onSubmit="return checkdata()" action="">
<TEXTAREA onkeydown="return changebyte1(document.test.icqcontent.value,198)" onkeyup="return changebyte1(document.test.icqcontent.value,198)" name=icqcontent cols=40 rows="3"></TEXTAREA>
<SPAN id=byte1><SCRIPT language=JavaScript>changebyte1(document.test.icqcontent.value,198);</SCRIPT></SPAN>
</form>
判斷填寫字數(shù)的限制
<script language=javascript>
function gbcount(message,total,used,remain)
{
var max;
max = total.value;
if(message.value.length > max){
message.value = message.value.substring(0,max);
used.value = max;
remain.value = 0;
alert('留言不能超過規(guī)定的字數(shù)!');
}
else{
used.value = message.value.length;
remain.value = max - used.value;
}
}
</script>
<form name='myform' >
<textarea name='GuestContent' cols='59' rows='6' onkeydown=gbcount(this.form.GuestContent,this.form.total,this.form.used,this.form.remain); onkeyup=gbcount(this.form.GuestContent,this.form.total,this.form.used,this.form.remain);></textarea>
最多字數(shù)：<INPUT disabled maxLength=4 name=total size=3 value=20>
已用字數(shù)：<INPUT disabled maxLength=4 name=used size=3 value=0>
剩余字數(shù)：<INPUT disabled maxLength=4 name=remain size=3>
</form>
注冊閱讀時間等待按鈕
<form action="
歡迎注冊
條款若干........
<input type="submit" value="請認真查看<服務(wù)條款和聲明> (15)" name="agreeb">
</form>
<SCRIPT language=javascript>
<!--
var secs = 15;
document.agree.agreeb.disabled=true;
for(i=1;i<=secs;i++) {
window.setTimeout("update(" + i + ")", i * 1000);
}
function update(num) {
if(num == secs) {
document.agree.agreeb.value =" 我 同 意 ";
document.agree.agreeb.disabled=false;
}
else {
printnr = secs-num;
document.agree.agreeb.value = "請認真查看<服務(wù)條款和聲明> (" + printnr +")";
}
}
//-->
</SCRIPT>