JS restricted text box can only enter the number of characters letters and prohibit the space code

1. Text box can only enter a numeric code (decimal point can not enter)

The code is as follows	Copy Code
<input onkeyup= "This.value=this.value.replace (/d/g,") "Onafterpaste=" This.value=this.value.replace (/D/g, "") " >

2. Only numbers can be entered and the decimal point may be lost.

The code is as follows	Copy Code
<input onkeyup= "if (isNaN (value)) ExecCommand (' Undo ') ' onafterpaste= ' if (isNaN (value)) ExecCommand (' Undo ') > <input name=txt1 onchange= "if (/d/.test (this.value)) {alert (' can only enter numbers '); this.value= ';} ' >

3. Number and decimal method two

The code is as follows

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<input type=text t_value= "" o_value= "" onkeypress= "if!this.value.match (/^[+-]?d*?.? d*?$/)) This.value=this.t_value;else this.t_value=this.value;if (This.value.match/^ (?: [+-]?d+ (?:. 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+ (?:. d+)?)? $/)) This.o_value=this.value "onblur=" if (/^ (?: [+-]?d+ (?:. 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} ">

Can be encapsulated into a separate function

The code is as follows

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function KeyPress (ob) { if (!ob.value.match (/^[+-]?d*?.? d*?$/)) Ob.value = Ob.t_value; else Ob.t_value = Ob.value; if (Ob.value.match/^ (?: [+-]?d+ (?:. d+)?)? $/)) Ob.o_value = Ob.value; } function KeyUp (ob) { if (!ob.value.match (/^[+-]?d*?.? d*?$/)) Ob.value = Ob.t_value; else Ob.t_value = Ob.value; if (Ob.value.match/^ (?: [+-]?d+ (?:. d+)?)? $/)) Ob.o_value = Ob.value; } function OnBlur (ob) { if (!ob.value.match/^ (?: [+-]?d+ (?:. d+)? |. D*?)? $/)) ob.value=ob.o_value;else{if (Ob.value.match (/^.d+$/)) ob.value=0+ob.value;if (Ob.value.match (/^.$/)) ob.value= 0;ob.o_value=ob.value}; }

Just call and pass in the This object!

4. Only letters and characters can be entered

The code is as follows	Copy Code
<input onkeyup= "Value=value.replace (/[d]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[d]/g, ') "maxlength=10 name=" Numbers ">

5. Can only enter English letters and numbers, can not enter Chinese

The code is as follows	Copy Code
<input onkeyup= "Value=value.replace (/[^w./]/ig, ')" >

6. Only numbers and English can be entered

The code is as follows	Copy Code
<input onkeyup= "Value=value.replace (/[^d|chun]/g, ')" >

7. Only a maximum of two digits after the decimal point (number, Chinese can be entered), can not enter letters and operational symbols:

The code is as follows	Copy Code
<input onkeypress= "If" (event.keycode<48 | | event.keycode>57) && event.keycode!=46 | |/.dd$/.test ( Value)) Event.returnvalue=false ">

8. After the decimal point can only have up to two digits (numbers, letters, Chinese can be entered), you can enter operational symbols:

The code is as follows	Copy Code
<input onkeyup= "This.value=this.value.replace (/^ (-) * (d+). ( DD). *$/, ' $1$2.$3 ' >

Only Chinese characters can be entered:

The code is as follows	Copy Code
<input onkeyup= "Value=value.replace (/[^u4e00-u9fa5]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^u4e00-u9fa5]/g, ') ">

Only numbers can be entered:

The code is as follows	Copy Code
<input onkeyup= "Value=value.replace (/[^d]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^d]/g, ') ">

Only English and numerals can be entered:

The code is as follows	Copy Code
<input onkeyup= "Value=value.replace (/[w]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^d]/g, ') ">

The control input box can only enter text or numbers, or it may not allow special characters to be entered
It is not allowed to enter the following characters: (like!@#$%^&*, etc.) <br>

The code is as follows	Copy Code
<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; " >

No space input only

The code is as follows	Copy Code
Onkeyup= "Value=value.replace (/s/g,") "

Only Chinese and English can be entered:

code is as follows	copy code
onkeyup= " Value=value.replace (/[^a-za-zu4e00-u9fa5]/g, ') "onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^a-za-zu4e00-u9fa5]/g, ') "