正在使用此javascript来限制用户只键入数字并仅输入一个点作为小数点分隔符。只允许在脚本中使用数字和点
<script type="text/javascript">
function fun_AllowOnlyAmountAndDot(txt)
{
if(event.keyCode > 47 && event.keyCode < 58 || event.keyCode == 46)
{
var txtbx=document.getElementById(txt);
var amount = document.getElementById(txt).value;
var present=0;
var count=0;
if(amount.indexOf(".",present)||amount.indexOf(".",present+1));
{
// alert('0');
}
/*if(amount.length==2)
{
if(event.keyCode != 46)
return false;
}*/
do
{
present=amount.indexOf(".",present);
if(present!=-1)
{
count++;
present++;
}
}
while(present!=-1);
if(present==-1 && amount.length==0 && event.keyCode == 46)
{
event.keyCode=0;
//alert("Wrong position of decimal point not allowed !!");
return false;
}
if(count>=1 && event.keyCode == 46)
{
event.keyCode=0;
//alert("Only one decimal point is allowed !!");
return false;
}
if(count==1)
{
var lastdigits=amount.substring(amount.indexOf(".")+1,amount.length);
if(lastdigits.length>=2)
{
//alert("Two decimal places only allowed");
event.keyCode=0;
return false;
}
}
return true;
}
else
{
event.keyCode=0;
//alert("Only Numbers with dot allowed !!");
return false;
}
}
</script>
<td align="right">
<asp:TextBox ID="txtQ1gTarget" runat="server" Width="30px" CssClass="txtbx" MaxLength="6" onkeypress="return fun_AllowOnlyAmountAndDot(this);"></asp:TextBox>
</td>
但onkeypress事件(这个)活动的回报,在这个地方
var amount = document.getElementById(txt).value;
这里有什么我的错对象,因为功能所需的错误?
不阻止复制和粘贴:( – MobileMon 2014-02-26 16:06:29
你可以试试这个:onkeypress事件= “返回fun_AllowOnlyAmountAndDot(事件);” – elfekz 2017-08-09 09:19:36