JS can only enter regular expressions such as numbers, numbers, and letters.

Source: Internet
Author: User

2011-12-07 11:44

JS can only be judged by numbers and decimal points.
0. Cannot enter Chinese
1) <input onpaste= "return false;" type= "text" name= "TextField" style= "width:400px; ime-mode:disabled "Value=" >
2) <script>
function Chkit (frm) {
if (Frm.n1.value.length>0&&frm.n1.value.match (/[\x01-\xff]*/) ==false) {
Alert (' N1 can't input Chinese! ‘)
Frm.n1.focus ();
return false;
}
}
</script>
<body>
<form onsubmit= "return Chkit (This)" >
<input name= "N1" >
<input name= "N2" >
<input name= "SMT" type= "submit" value= "Submission" >
</form>
</body>

1. Text box can only enter a numeric code (the decimal point can not be entered)
<input onkeyup= "This.value=this.value.replace (/\d/g, ')" onafterpaste= "This.value=this.value.replace (/\D/g, ' ) ">
2. Only the number can be entered and the decimal point will be lost.
<input onkeyup= "if (IsNaN (value)) ExecCommand (' Undo ')" Onafterpaste= "if (IsNaN (value)) ExecCommand (' Undo ')" >
<input name=txt1 onchange= "if (/\d/.test (this.value)) {alert (' Input number only '); this.value= ';}" >
3. Number and decimal method two
<input type=text t_value= "" o_value= "" onkeypress= "if (!this.value.match.? \d*?$/)) This.value=this.t_value;else this.t_value=this.value;if (This.value.match (?: [/^ (?: \. \d+)?)? $/)) This.o_value=this.value "onkeyup=" if (!this.value.match (/^[\+\-]?\d*?\.? \d*?$/)) This.value=this.t_value;else this.t_value=this.value;if (This.value.match (?: [/^ (?: \. \d+)?)? $/)) This.o_value=this.value "onblur=" if (!this.value.match (?: [/^ (?: \). \d+)? | \.\d*?)? $/) this.value=this.o_value;else{if (This.value.match (/^\.\d+$/)) this.value=0+this.value;if (This.value.match (/^ \.$/)) This.value=0;this.o_value=this.value} ">
4. Only letters and kanji can be entered
<input onkeyup= "Value=value.replace (/[\d]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[\d]/g, ') "maxlength=10 name=" Numbers ">
5. Only English letters and numbers can be entered, not Chinese
<input onkeyup= "Value=value.replace (/[^\w\.\/]/ig, ')" >
6. Only enter numbers and English <font color= "Red" >chun</font>
<input onkeyup= "Value=value.replace (/[^\d|chun]/g, ')" >
7. Only a maximum of two digits after the decimal point (numeric, Chinese can be entered), can not enter letters and operation symbols:
<input onkeypress= "if ((event.keycode<48 | | event.keycode>57) && event.keycode!=46 | |/\.\d\d$/.test ( Value)) Event.returnvalue=false ">
8. Only a maximum of two digits after the decimal point (numbers, letters, Chinese can be entered), you can enter the operation symbol:

<input onkeyup= "This.value=this.value.replace (/^ (\-) * (\d+) \. ( \d\d). *$/, ' $1$2.$3 ') ">

Prohibit special characters:

Onkeypress= "if (Event.keycode < | | Event.keycode >) event.returnvalue = false;"

Only Chinese characters can be entered:
<input onkeyup= "Value=value.replace (/[^/u4e00-/u9fa5]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^/u4e00-/u9fa5]/g, ')) ">

style= "ime-mode:disabled" forbidden Chinese Character input method

Only numbers can be entered:

<input onkeyup= "Value=value.replace (/[^/d]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^/d]/g, ')) ">


Only English and numbers can be entered:
<input onkeyup= "Value=value.replace (/[/w]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^/d]/g, ')) ">

Control input Box can only enter text or numbers, or you can not allow special characters to be entered
You are not allowed to enter the following characters: (like ^&*, etc.) <br>
<textarea rows=2 cols=20 name=comments onkeypress= "if ((Event.keycode > && event.keycode < 48) | | (Event.keycode > && event.keycode < 65) | | (Event.keycode > && event.keycode < 97)) Event.returnvalue = false; " >

Only whitespace input is forbidden
Onkeyup= "Value=value.replace (//s/g, ')"

Onkeydown= "if (event.keycode==32) return false"

Only Chinese and English can be entered:
Onkeyup= "Value=value.replace (/[^/a-za-z/u4e00-/u9fa5]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^/a-za-z/u4e00-/u9fa5]/g, ')) "

You are not allowed to enter special characters and spaces:

<input id= "code" onkeypress= "Return Validatespecialcharacter ();" Onblur= "Validate (This)"/>

————————————————————————————————————————

cannot be empty
<input onblur= "if (This.value.replace (/^ +| +$/g, ') = =") alert (' cannot be empty! ') " >

The judging character consists of a letter and a number, an underscore, and a dot. And only the underscore and the letter can begin
/^ ([A-za-z_]{1}) ([\w]*) $/g.test (str)

Only numbers can be entered
<input name= "text" type= "text" id= "NewPage" onkeyup= "Value=value.replace (/\d/g, ')" onafterpaste= "value= Value.replace (/\d/g, ') ">

You can only enter Chinese
<input type= "text" onkeyup= "Value=value.replace (/[^\u4e00-\u9fa5]/g, ')" >

Can only be entered in English
<input type= "text" onkeyup= "Value=value.replace (/[^\a-\z\a-\z]/g, ')" >
<input type= "text" onkeyup= "Value=value.replace (/[^a-za-z]/g, ')" >

--------------------------------------------------------------------------------------------------------------- -----

1. Text box can only enter a numeric code (the decimal point can not be entered)
<input onkeyup= "This.value=this.value.replace (//d/g, ')" onafterpaste= "This.value=this.value.replace (//D/g, ' ) ">

2. Only the number can be entered and the decimal point will be lost.
<input onkeyup= "if (IsNaN (value)) ExecCommand (' Undo ')" Onafterpaste= "if (IsNaN (value)) ExecCommand (' Undo ')" >
<input name=txt1 onchange= "if (//d/.test (this.value)) {alert (' Input number only '); this.value= ';}" >

3. Number and decimal method two
<input type=text t_value= "" o_value= "" onkeypress= "if (!this.value.match.? /d*?$/)) This.value=this.t_value;else this.t_value=this.value;if (This.value.match (?: [/^ (?:/. /d+)?)? $/)) This.o_value=this.value "onkeyup=" if (!this.value.match (/^[/+/-]?/d*?/.? /d*?$/)) This.value=this.t_value;else this.t_value=this.value;if (This.value.match (?: [/^ (?:/. /d+)?)? $/)) This.o_value=this.value "onblur=" if (!this.value.match (?: [/^ (?:/. /d+)? | /./d*?)? $/) this.value=this.o_value;else{if (This.value.match (/^/./d+$/)) this.value=0+this.value;if (This.value.match (/^ /.$/)) This.value=0;this.o_value=this.value} ">

4. Only letters and kanji can be entered
<input onkeyup= "Value=value.replace (/[/d]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[/d]/g, ') "maxlength=10 name=" Numbers ">

5. Only English letters and numbers can be entered, not Chinese
<input onkeyup= "Value=value.replace (/[^/w/.//]/ig, ')" >

6. Only enter numbers and English <font color= "Red" >chun</font>
<input onkeyup= "Value=value.replace (/[^/d|chun]/g, ')" >

7. Only a maximum of two digits after the decimal point (numeric, Chinese can be entered), can not enter letters and operation symbols:
<input onkeypress= "if ((event.keycode<48 | | event.keycode>57) && event.keycode!=46 | |//./d/d$/.test ( Value)) Event.returnvalue=false ">

8. Only a maximum of two digits after the decimal point (numbers, letters, Chinese can be entered), you can enter the operation symbol:
<input onkeyup= "This.value=this.value.replace (/^ (/-) * (/d+)/. ( /D/D). *$/, ' $1$2.$3 ') ">

You can only enter Chinese, English, numbers, @ symbols, and. Symbols
<input type= "text" onkeyup= "Value=value.replace (/[^\a-\z\a-\z0-9\u4e00-\u9fa5\@\.] /g, ') ' >

Only English is allowed and cannot be pasted or pop-up menu
<input type= "text" onkeyup= "Value=value.replace (/[^\a-\z\a-\z]/g, ')" onkeydown= "Fnckeystop (event)" Onpaste= " return false "OnContextMenu =" return false "/>

Only numbers and dot numbers can be entered (note: in [^\d\.] D cannot be written in uppercase D, otherwise it becomes all characters except the number.
<input name= "Price" type= "text" size= "8" maxlength= "8" onkeyup= "Value=value.replace (/[^\d\.] /g, ') ' >

All in all: First enter onkeyup= "Value=value.replace (/[^\x]/g,") in <input> and then X in (/[\x]/g, ") to the code you want to enter.

English : u4e00-u9fa5
numbers : D, 0-9
English : A-Z, A-Z
Other symbols @, dots, or other symbols. Can also be multiple, with \ Separated on the line.
For example:
Add symbols in Chinese, English, and digital plus @ symbols: \a-\z\a-\z0-9\u4e00-\u9fa5\@\.

If you want to not right-click in the text box pop-up menu and can not paste into the copied information, you will enter the <input> onkeydown= "Fnckeystop (event)" onpaste= "return false" OnContextMenu = "return false;"

--------------------------------------------------------------------------------------------------------------- ------------------------

one is to allow only numbers and decimal points to be entered.
<input onkeypress= "return (/[/d.) /.test (String.fromCharCode (Event.keycode))) "style=" ime-mode:disabled ">

Second , the judgment is more detailed, even 22. 2 That's not a number.

<script>
function Check () {
if (IsNaN (tt.value))
{alert ("illegal character! "); 
tt.value= "";}

</script>
<input type= "text" Name= "tt" onkeyup= "check ();" >

the third, only allows the input of integers. In fact, we can also make some restrictions according to the third article extrapolate.

<script language=javascript>
function Onlynum ()

if (! ( EVENT.KEYCODE==46) &&! (event.keycode==8) &&! (event.keycode==37) &&! (event.keycode==39))
if (! ( (event.keycode>=48&&event.keycode<=57) | | (event.keycode>=96&&event.keycode<=105)))
Event.returnvalue=false;

</script><input onkeydown= "Onlynum ();" Style= "ime-mode:disabled>
the conclusion, in fact

style= "Ime-mode:disabled
This sentence is more practical. Turn off the IME. Save some people to open the full-width input number, the result input does not come in to find you kutianmalei, also blame you design bad.

allow only numeric input
<input name= "username" type= "text" onkeyup= "Value=this.value.replace (//d+/g, ')" >

only English letters, numbers, and underscores are allowed (the following two methods are implemented)
<input name= "Userna first, only numbers and decimal points are allowed.
<input onkeypress= "return (/[/d.) /.test (String.fromCharCode (Event.keycode))) "style=" ime-mode:disabled ">

Second , the judgment is more detailed, even 22. 2 That's not a number.

<script>
function Check () {
if (IsNaN (tt.value))
{alert ("illegal character! "); 
tt.value= "";}

</script>
<input type= "text" Name= "tt" onkeyup= "check ();" >

the third, only allows the input of integers. In fact, we can also make some restrictions according to the third article extrapolate.

<script language=javascript>
function Onlynum ()

if (! ( EVENT.KEYCODE==46) &&! (event.keycode==8) &&! (event.keycode==37) &&! (event.keycode==39))
if (! ( (event.keycode>=48&&event.keycode<=57) | | (event.keycode>=96&&event.keycode<=105)))
Event.returnvalue=false;

</script><input onkeydown= "Onlynum ();" Style= "ime-mode:disabled>
the conclusion, in fact

style= "Ime-mode:disabled
This sentence is more practical. Turn off the IME. Save some people to open the full-width input number, the result input does not come in to find you kutianmalei, also blame you design bad.

allow only numeric input
<input name= "username" type= "text" onkeyup= "Value=this.value.replace (//d+/g, ')" >

only English letters, numbers, and underscores are allowed (the following two methods are implemented)
<input name= "username" type= "text" style= "ime-mode:disabled" >
<input name= "username" type= "text" onkeyup= "Value=value.replace (/[^/w/.//]/ig, ')" >

only English letters, numbers and &[email are allowed protected]
<input name= "username" type= "text" onkeyup= "Value=value.replace (/[^/[email protected]&]|_/ig, ')" >

allow only Chinese characters to be entered
<input name= "username" type= "text" onkeyup= "Value=value.replace (/[^/u4e00-/u9fa5]/g, ')" >
Me "type=" text "style=" ime-mode:disabled ">
<input name= "username" type= "text" onkeyup= "Value=value.replace (/[^/w/.//]/ig, ')" >

only English letters, numbers and &[email are allowed protected]
<input name= "username" type= "text" onkeyup= "Value=value.replace (/[^/[email protected]&]|_/ig, ')" >

allow only Chinese characters to be entered
<input name= "username" type= "text" onkeyup= "Value=value.replace (/[^/u4e00-/u9fa5]/g, ')" >

JS can only enter regular expressions such as numbers, numbers, and letters.

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