form-Singular character validation regular _ regular expressions
Source: Internet
Author: User
<input type= "text" name= "TextField" onkeypress= "Javascript:alert (Event.keycode); return flase" >
1. Text box can only enter a numeric code (decimal point can not enter)
<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.
<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
<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 (!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 (/^ \.$/)) This.value=0;this.o_value=this.value} ">
4. Only letters and characters can be entered
<input onkeyup= "Value=value.replace (/[\d]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[\d]/g, ') "maxlength=10 name=" Numbers ">
5. Can only enter English letters and numbers, can not enter Chinese
<input onkeyup= "Value=value.replace (/[^\w\.\/]/ig, ')" >
6. Only digital and English <font color= "Red" >chun</font>
<input onkeyup= "Value=value.replace (/[^\d|chun]/g, ')" >
7. Only a maximum of two digits after the decimal point (number, Chinese can be entered), can not enter letters and operational symbols:
<input onkeypress= "If" (event.keycode<48 | | event.keycode>57) && event.keycode!=46 | |/\.\d\d$/.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:
<input onkeyup= "This.value=this.value.replace (/^ (\-) * (\d+) \. ( \d\d). *$/, ' $1$2.$3 ') >
<input onkeyup= "This.value=this.value.replace (/\d/g,") "Onafterpaste=" This.value=this.value.replace (/\D/g, " ) ">
Or
<input name=txt1 onchange= "if (/\d/.test (this.value)) {alert (' can only enter numbers '); this.value= ';} ' >
Or
<input onkeyup= "if (isNaN (value)) ExecCommand (' Undo ') ' onafterpaste= ' if (isNaN (value)) ExecCommand (' Undo ') >
Restrict text boxes to only enter numbers including decimal points
<input onkeyup= "Value=value.replace (/[^\d\.] /g, ') ' >
About regular expression 1. Only numbers and English can be entered: <input onkeyup= "Value=value.replace (/[\w]/g,") "Onbeforepaste=" Clipboarddata.setdata (' Text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ') "id=" Text1 "name=" Text1 ">
2. Only numbers can be entered: <input onkeyup= "Value=value.replace (/[^\d]/g,") "Onbeforepaste=" Clipboarddata.setdata (' text ', Clipboarddata.getdata (' text '). Replace (/[^\d]/g, ') "id=" Text2 "name=" Text2 ">
3. Only the full angle can be entered: <input onkeyup= "Value=value.replace (/[^\uff00-\uffff]/g,") "Onbeforepaste=" Clipboarddata.setdata (' Text ', Clipboarddata.getdata (' text '). Replace (/[^\uff00-\uffff]/g, ') "id=" Text3 "name=" Text3 ">
4. 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, ') "id=" Text4 "name=" TEXT4 ">
When you move to an input box, it is automatically selected: <input type= "text" id= "Text1" name= "Text1" value= "input retrieves the keyword" onclick= "Javascript:this.form.text1.focus ( ); This.form.text1.select (); "Maxlength="/>
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