Sometimes you need to limit the type of text box input content, this section share the regular expression limit text box can only enter numbers, decimal points, English letters, Chinese characters and other code.
For example, enter a positive integer greater than 0
The code is as follows: <input onkeyup= "if (this.value.length==1) {this.value=this.value.replace (/[^1-9]/g, ')}else{this.value= This.value.replace (/\d/g, ')} "onafterpaste=" if (this.value.length==1) {this.value=this.value.replace (/[^1-9]/g, ' ')}else{this.value=this.value.replace (/\d/g, ')} ">
1, the text box can only enter a numeric code (the decimal point can not be entered)
The code is as follows:
<input onkeyup= "This.value=this.value.replace (/\d/g, ')" onafterpaste= "This.value=this.value.replace (/\D/g, ' ) ">
2, only the number can be entered, the decimal point will be lost.
The code is as follows:
<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, digit and decimal method two
The code is as follows:
<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 (/^ \.$/)) This.value=0;this.o_value=this.value} ">
Encapsulated as a separate function:
The code is as follows: function keyPress (ob) {
if (!ob.value.match (/^[\+\-]?\d*?\.? \d*?$/)) 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 (/^\.$/)) Ob.value=0;ob.o_value=ob.value};
}
Just call, pass in the This object!
4, only letters and kanji can be entered
The code is as follows:
<input onkeyup= "Value=value.replace (/[\d]/g, ')" onbeforepaste= "Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[\d]/g, ') "maxlength=10 name=" Numbers ">
5, can only input English letters and numbers, cannot input Chinese
The code is as follows:
<input onkeyup= "Value=value.replace (/[^\w\.\/]/ig, ')" >
6, can only enter numbers and English
The code is as follows:
<input onkeyup= "Value=value.replace (/[^\d|chun]/g, ')" >
7, only a maximum of two digits after the decimal point (numbers, Chinese can be entered), can not enter letters and operation symbols:
The code is as follows:
<input onkeypress= "if ((event.keycode<48 | | event.keycode>57) && event.keycode!=46 | |/\.\d\d$/.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:
The code is as follows:
<input onkeyup= "This.value=this.value.replace (/^ (\-) * (\d+) \. ( \d\d). *$/, ' $1$2.$3 ') "> 9, enter key to move the cursor to the next input box
<input type= "text" onkeydown= "if (event.keycode==13) event.keycode=9"/> 10, regular match ^[1-9]\d*$//matched positive integer
^-[1-9]\d*$//Match negative integer
^-? [1-9]\d*$//Match integer
^[1-9]\d*|0$//matches non-negative integers (positive integers + 0)
^-[1-9]\d*|0$//matches a non-positive integer (negative integer + 0)
^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$//Match positive floating point number
^-([1-9]\d*\.\d*|0\.\d*[1-9]\d*) $//Match negative floating point number
^-? ([1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0) $//Match floating point number
^[1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0$//Match non-negative floating-point number (positive floating point + 0)
^ (-([1-9]\d*\.\d*|0\.\d*[1-9]\d*)) |0?\.0+|0$//match non-positive floating-point number (negative floating-point number + 0)
The input box in HTML or PHP can only enter a positive integer, and the logical and/or operation
