js limit number js limit input implementation code_javascript skills

1. Only Chinese characters can be input

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2. Only numbers can be entered

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Simple prohibition of inputting Chinese characters

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Enter numbers and decimal points:

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onkeyup="value=value.replace(/[^d{1,}.d{1,}|d{1,}]/g,'')"

javascript can only enter numbers and ":".2007-11-24 15:50
Only numbers and ":" can be used, for example, when entering time.

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Only letters and equal signs can be entered, but Chinese characters cannot be entered.

Other things:
Script javascript that can only enter numbers- -

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The first half of the sentence means that keyboard typing can only be numbers, and the second half of the sentence means that pasting can only be numbers

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3. JavaScript limits only numbers and English to be entered

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function isregname( checkobj)
{
var checkOK = "0123456789 -_abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
var checkStr = checkobj;
var allValid = true;
var decPoints = 0;
for (i = 0; i {
ch = checkStr.charAt(i);
for (j = 0; j if (ch == checkOK.charAt(j))
break;
if (j == checkOK.length)
{
allValid = false;
break;
}
}
return (allValid)
}
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if(!(isregname(obj.loginname.value))){
alert("[Member code] does not comply with the specification, member code It can only be English letters or numbers");
obj.loginname.focus();
return(false);
}
if(!(isregname(obj.password.value))) {
alert("[Password] does not meet the specifications, the password can only be English letters or numbers");
obj.password.focus();
return(false);
}

4.javascript can only input English and numbers into the input box

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5. You can use Javascript to check the text box and filter out non-0-9 characters

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[url=http://blog.csdn.net/xujh/admin/EditPosts.aspx] [/url]

6. Only the IP address format can be entered in the text box

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<script> <BR>function mask(obj ){ <BR>obj.value=obj.value.replace(/[^d]/g,'') <BR>key1=event.keyCode <BR>if (key1==37 || key1==39) <BR>{ obj.blur(); <BR>nextip=parseInt(obj.name.substr(2,1)) <BR>nextip=key1==37?nextip-1:nextip 1; <BR>nextip= nextip>=5?1:nextip <BR>nextip=nextip<=0?4:nextip <BR>eval("ip" nextip ".focus()") <BR>} <BR>if(obj.value. length>=3) <BR>if(parseInt(obj.value)>=256 || parseInt(obj.value)<=0) <BR>{ <BR>alert(parseInt(obj.value) "IP Wrong address! ") <BR>obj.value="" <BR>obj.focus() <BR>return false; <BR>} <BR>else <BR>{ obj.blur(); <BR>nextip=parseInt( obj.name.substr(2,1)) 1 <BR>nextip=nextip>=5?1:nextip <BR>nextip=nextip<=0?4:nextip <BR>eval("ip" nextip ".focus ()") <BR>} <BR>} <BR>function mask_c(obj) <BR>{ <BR>clipboardData.setData('text',clipboardData.getData('text').replace(/[^d ]/g,'')) <BR>} <BR></script>


IP address input

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