Common JS Form Verification Code (including examples)

Copy codeThe Code is as follows: // ---------------- Author Teng -------------
// Verify whether it is null
Function check_blank (obj, obj_name ){
If (obj. value! = ''){
Return true;
} Else {
Alert (obj_name + "cannot be blank! ");
Obj. value = "";
Return false;
}
}

// Filter the length of input characters
Function check_str_len (name, obj, maxLength ){
Obj. value = obj. value. replace (/(^ \ s *) | (\ s * $)/g ,"");
Var newvalue = obj. value. replace (/[^ \ x00-\ xff]/g ,"**");
Var length11 = newvalue. length;
If (length11> maxLength ){
Alert (name + "cannot exceed" + maxLength + "characters! ");
Obj. value = "";
Obj. focus ();
}
}

// Verification can only be a number
Function checkNumber (obj ){
Var reg =/^ [0-9] + $ /;
If (obj. value! = ""&&! Reg. test (obj. value )){
Alert ('only numbers can be entered! ');
Obj. value = "";
Obj. focus ();
Return false;
}
}

// Verify the value range

Function check_num_value (obj_name, obj, minvalue, maxvalue ){
Var reg =/^ [0-9] + $ /;
If (obj. value! = ""&&! Reg. test (obj. value )){
Alert (obj_name + 'can only enter numbers! ');
Obj. value = "";
Obj. focus ();
Return false;
} Else if (minvalue> obj. value | obj. value> maxvalue ){
Alert (the range of obj_name + "is" + minvalue + "-" + maxvalue + "! ");
Obj. value = "";
Obj. focus ();
Return false;
}

}

// Verification can only contain letters and numbers
Function checkZmOrNum (zmnum ){
Var zmnumReg =/^ [0-9a-zA-Z] * $ /;
If (zmnum. value! = ""&&! ZmnumReg. test (zmnum. value )){
Alert ("only letters or numbers can be entered. Please enter again ");
Zmnum. value = "";
Zmnum. focus ();
Return false;
}
}

// Verify the double precision number
Function check_double (obj, obj_name ){
Var reg =/^ [0-9] + (\. [0-9] + )? $ /;
If (obj. value! = ""&&! Reg. test (obj. value )){
Alert (obj_name + 'must be a valid double-precision number ');
Obj. value = "";
Obj. focus ();
Return false;
}
}

// Select all check boxes
Function checkboxs_all (obj, cName ){
Var checkboxs = document. getElementsByName (cName );
For (var I = 0; I <checkboxs. length; I ++ ){
Checkboxs [I]. checked = obj. checked;
}
}

// Verify the zip code
Function check_youbian (obj ){
Var reg =/^ \ d {6} $ /;
If (obj. value! = ""&&! Reg. test (obj. value )){
Alert ('postal code format incorrect! ');
Obj. value = "";
Obj. focus ();
Return false;
}
}

// Verify the email format
Function check_email (obj ){
Var reg =/^ [a-zA-Z0-9 _-] + (\. ([a-zA-Z0-9 _-]) +) * @ [a-zA-Z0-9 _-] + [.] [a-zA-Z0-9 _-] + ([.] [a-zA-Z0-9 _-] +) * $ /;
If (obj. value! = ""&&! Reg. test (obj. value )){
Obj. select ();
Alert ('email format incorrect! ');
Obj. value = "";
Obj. focus ();
Return false;
}
}

/* Verify the landline number
0 \ d {2, 3} represents the area code
[0 \ +] \ d {2, 3} represents the international area code
\ D {7, 8} represents 7-8 digits (phone number)
Correct format: area code-phone number-extension code (full | only phone number)
*/

Function check_phone (obj ){
Var reg =/^ ([0 \ +] \ d {2, 3 }-)? (0 \ d {2, 3 })-)? (\ D {7, 8}) (-(\ d {3 ,}))? $ /;
If (obj. value! = ""&&! Reg. test (obj. value )){
Alert ('incorrect phone number format! ');
Obj. value = "";
Obj. focus ();
Return false;
}
}

// Verify the mobile phone number (check the mobile phone number starting with 13, 15, and 18 !)
Function check_telephone (obj ){
Var reg =/^ [1] [358] \ d {9} $ /;
If (obj. value! = ""&&! Reg. test (obj. value )){
Alert ('mobile Phone Number Format incorrect! ');
Obj. value = "";
Obj. focus ();
Return false;
}
}

// Verify whether it is Chinese
Function isChinese (obj, obj_name ){
Var reg =/^ [\ u0391-\ uFFE5] + $ /;
If (obj. value! = ""&&! Reg. test (obj. value )){
Alert (obj_name + 'must be in Chinese! ');
Obj. value = "";
Obj. focus ();
Return false;
}
}

// Determine whether the browser is Internet Explorer

Function checkIsIE (){
If (-[1,]) {
Alert ("this is not an Internet Explorer! ");
} Else {
Alert ("this is IE browser! ");
}
}

// Verify whether the URL is correct
Function check_IsUrl (obj ){

}

// Check the time (compared with the current time)
Function checkDate (obj, obj_name ){
Var obj_value = obj. value. replace (/-/g, "/"); // replace the character into the standard format (check format: '2017-12-10 ')
// Var obj_value = obj. value. replace ("-", "/"); // replace the character into the standard format (the test format is '2017-12-10 ')
Var date1 = new Date (Date. parse (obj_value ));
Var date2 = new Date (); // obtain the Date of today
If (date1> date2 ){
Alert (obj_name + "cannot be later than the current time! ");
Return false;
}
}
/// Copyright 2010-2012 com. zljy. teng. js ////