JS检查剩余输入字符的一个函数，求大家帮忙看看哪有错解决方法
日期：2014-05-16 浏览次数：20387 次
JS检查剩余输入字符的一个函数，求大家帮忙看看哪有错
大家 帮忙看看检测剩余字符的这个代码出错出在哪
<html>
<head>
<title> 剩余字符
</title>
<script language= "javascript " type= "text/javascript ">
function scount(content,total,used,remain)
{
var amax;
amax=total.value;
if (content.value.length> amax)
{
content.value=content.value.substring(0,amax);
used.value=amax;
remain.value=0;
alert( "对不起你已经写满： " +amax);
}
else
{
used.value=content.value.length;
remain.value=amax - used.value;
}
}
</script>
</head>
<body onkeyi[>
<form action= "5-14-2.html " method= "post " name= "reply " id= "reply ">
<table>
<tr>
<td>
????:??:
<input type= "text " name= "total " value= "1024 " size= "5 " id= "total ">
??:
<input type= "text " name= "used " value= "0 " size= "5 " id= "use ">
??:
<input type= "text " name= "remain " value= "1024 " size= "5 " id= "remain ">
</td>
</tr>
<tr>
<td align= "center " >
<textarea cols= "40 " rows= "8 " name= "content " id= "content " onKeyUp= "scount(this.form.content,this.form.total,this.form.used,this.form.remain) ">
</textarea>
</td>
</tr>
<tr>
<td align= "center ">
<input type= "submit " name= "Submit " value= "ok " size= "10 ">
<input type= "reset " name= "Reset " value= "?? " size= "10 ">
</td>
</tr>
</table>
</form>
</body>
</html>
就是想实现文本框还可输入多少字符的一个函数，求大家看看！·谢谢了！
------解决方案--------------------
你那些得太繁琐 给你个简单的
<script Language= "JavaScript ">
maxLen = 200;
function checkMaxInput(form){
if (form.message.value.length > maxLen){
form.message.value = form.message.value.substring(0, maxLen);
} else {
form.remLen.value = maxLen - form.message.value.length;
}
}
<textarea name=message wrap=physical cols=28 rows=8 onKeyDown= "checkMaxInput(this.form) "> </textarea>
<input type=text name=remLen size=2 maxlength=3 value= "200 " readonly>
大家 帮忙看看检测剩余字符的这个代码出错出在哪
<html>
<head>
<title> 剩余字符
</title>
<script language= "javascript " type= "text/javascript ">
function scount(content,total,used,remain)
{
var amax;
amax=total.value;
if (content.value.length> amax)
{
content.value=content.value.substring(0,amax);
used.value=amax;
remain.value=0;
alert( "对不起你已经写满： " +amax);
}
else
{
used.value=content.value.length;
remain.value=amax - used.value;
}
}
</script>
</head>
<body onkeyi[>
<form action= "5-14-2.html " method= "post " name= "reply " id= "reply ">
<table>
<tr>
<td>
????:??:
<input type= "text " name= "total " value= "1024 " size= "5 " id= "total ">
??:
<input type= "text " name= "used " value= "0 " size= "5 " id= "use ">
??:
<input type= "text " name= "remain " value= "1024 " size= "5 " id= "remain ">
</td>
</tr>
<tr>
<td align= "center " >
<textarea cols= "40 " rows= "8 " name= "content " id= "content " onKeyUp= "scount(this.form.content,this.form.total,this.form.used,this.form.remain) ">
</textarea>
</td>
</tr>
<tr>
<td align= "center ">
<input type= "submit " name= "Submit " value= "ok " size= "10 ">
<input type= "reset " name= "Reset " value= "?? " size= "10 ">
</td>
</tr>
</table>
</form>
</body>
</html>
就是想实现文本框还可输入多少字符的一个函数，求大家看看！·谢谢了！
------解决方案--------------------
你那些得太繁琐 给你个简单的
<script Language= "JavaScript ">
maxLen = 200;
function checkMaxInput(form){
if (form.message.value.length > maxLen){
form.message.value = form.message.value.substring(0, maxLen);
} else {
form.remLen.value = maxLen - form.message.value.length;
}
}
<textarea name=message wrap=physical cols=28 rows=8 onKeyDown= "checkMaxInput(this.form) "> </textarea>
<input type=text name=remLen size=2 maxlength=3 value= "200 " readonly>
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