Common JavaScript detection script _ Javascript tutorial

JavaScript: Common JavaScript detection scripts. Javascript tutorial *

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

File Name: check. js

Note: JavaScript scripts are used to check the input data of the webpage submission form.

Version: 1.0

*/

 

/*

Purpose: Verify the IP address format.

Input: strIP: IP Address

Return: If the verification succeeds, true is returned; otherwise, false is returned;

 

*/

Function isIP (strIP ){

If (isNull (strIP) return false;

Var re =/^ (\ d + )\. (\ d + )\. (\ d + )\. (\ d +) $/g // Regular Expression matching IP addresses

If (re. test (strIP ))

{

If (RegExp. $1 <256 & RegExp. $2 <256 & RegExp. $3 <256 & RegExp. $4 <256) return true;

}

Return false;

}

 

/*

Purpose: Check whether the input string is null or all are spaces.

Input: str

Return Value:

If all values are null, true is returned. Otherwise, false is returned.

*/

Function isNull (str ){

If (str = "") return true;

Var regu = "^ [] + $ ";

Var re = new RegExp (regu );

Return re. test (str );

}

 

 

/*

Purpose: Check whether the value of the input object conforms to the integer format.

Input: str string

Return: If the verification succeeds, true is returned; otherwise, false is returned.

 

*/

Function isInteger (str ){

Var regu =/^ [-] {0, 1} [0-9] {1,} $ /;

Return regu. test (str );

}

 

/*

Purpose: Check whether the entered mobile phone number is correct.

Input:

S: String

Return Value:

If the verification succeeds, true is returned. Otherwise, false is returned.

 

*/

Function checkMobile (s ){

Var regu =/^ [1] [3] [0-9] {9} $ /;

Var re = new RegExp (regu );

If (re. test (s )){

Return true;

} Else {

Return false;

}

}

 

 

/*

Purpose: Check whether the input string conforms to the positive integer format.

Input:

S: String

Return Value:

If the verification succeeds, true is returned. Otherwise, false is returned.

 

*/

Function isNumber (s ){

Var regu = "^ [0-9] + $ ";

Var re = new RegExp (regu );

If (s. search (re )! =-1 ){

Return true;

} Else {

Return false;

}

}

 

/*

Purpose: Check whether the input string is in decimal number format. It can be a negative number.

Input:

S: String

Return Value:

If the verification succeeds, true is returned. Otherwise, false is returned.

 

*/

Function isDecimal (str ){

If (isInteger (str) return true;

Var re =/^ [-] {0, 1} (\ d +) [\.] + (\ d +) $ /;

If (re. test (str )){

If (RegExp. $1 = 0 & RegExp. $2 = 0) return false;

Return true;

} Else {

Return false;

}

}

 

/*

Purpose: Check whether the value of the input object conforms to the port number format.

Input: str string

Return: If the verification succeeds, true is returned; otherwise, false is returned.

 

*/

Function isPort (str ){

Return (isNumber (str) & str <65536 );

}

 

/*

Purpose: Check whether the value of the input object complies with the E-Mail format.

Input: str string

Return: If the verification succeeds, true is returned; otherwise, false is returned.

 

*/

Function isEmail (str ){

Var myReg =/^ [-_ A-Za-z0-9] + @ ([_ A-Za-z0-9] + \.) + [A-Za-z0-9] {2, 3} $ /;

If (myReg. test (str) return true;

Return false;

}

 

/*

Purpose: Check whether the input string meets the amount format

The format is defined as a positive number with decimal places. A maximum of three decimal places can be entered.

Input:

S: String

Return Value:

If the verification succeeds, true is returned. Otherwise, false is returned.

 

*/

Function isMoney (s ){

Var regu = "^ [0-9] + [\.] [0-9] {0, 3} $ ";

Var re = new RegExp (regu );

If (re. test (s )){

Return true;

} Else {

Return false;

}

}

/*

Purpose: Check whether the input string is composed of English letters, numbers, and underscores (_).

Input:

S: String

Return Value:

If the verification succeeds, true is returned. Otherwise, false is returned.

 

*/

Function isNumberOr_Letter (s) {// determines whether it is a number or letter

 

Var regu = "^ [0-9a-zA-Z \ _] + $ ";

Var re = new RegExp (regu );

If (re. test (s )){

Return true;

} Else {

Return false;

}

}

/*

Purpose: Check whether the input string consists of only English letters and numbers.

Input:

S: String

Return Value:

If the verification succeeds, true is returned. Otherwise, false is returned.

 

*/

Function isNumberOrLetter (s) {// determines whether it is a number or letter

 

Var regu = "^ [0-9a-zA-Z] + $ ";

Var re = new RegExp (regu );

If (re. test (s )){

Return true;

} Else {

Return false;

}

}

/*

Purpose: Check whether the input string consists of only Chinese characters, letters, and numbers.

Input:

Value: String

Return Value:

If the verification succeeds, true is returned. Otherwise, false is returned.

 

*/

Function isChinaOrNumbOrLett (s) {// determines whether it is composed of Chinese characters, letters, and numbers.

 

Var regu = "^ [0-9a-zA-Z \ u4e00-\ u9fa5] + $ ";

Var re = new RegExp (regu );

If (re. test (s )){

Return true;

} Else {

Return false;

}

}

 

/*

Purpose: determine whether it is a date.

Input: date; fmt: date Format

Return: If the verification succeeds, true is returned; otherwise, false is returned.

*/

Function isDate (date, fmt ){

If (fmt = null) fmt = "yyyyMMdd ";

Var yIndex = fmt. indexOf ("yyyy ");

If (yIndex =-1) return false;

Var year = date. substring (yIndex, yIndex + 4 );

Var mIndex = fmt. indexOf ("MM ");

If (mIndex =-1) return false;

Var month = date. substring (mIndex, mIndex + 2 );

Var dIndex = fmt. indexOf ("dd ");

If (dIndex =-1) return false;

Var day = date. substring (dIndex, dIndex + 2 );

If (! IsNumber (year) | year> "2100" | year <"1900") return false;

If (! IsNumber (month) | month> "12" | month <"01") return false;

If (day> getMaxDay (year, month) | day <"01") return false;

Return true;

}

 

Function getMaxDay (year, month ){

If (month = 4 | month = 6 | month = 9 | month = 11)

Return "30 ";

If (month = 2)

If (year % 4 = 0 & amp; year % 100! = 0 | year % 400 = 0)

Return "29 ";

Else

Return "28 ";

Return "31 ";

}

 

/*

Purpose: whether character 1 ends with string 2

Input: str1: string; str2: contained string

Return: If the verification succeeds, true is returned; otherwise, false is returned.

 

*/

Function isLastMatch (str1, str2)

{

Var index = str1.lastIndexOf (str2 );

If (str1.length = index + str2.length) return true;

Return false;

}

 

 

/*

Purpose: whether character 1 starts with string 2

Input: str1: string; str2: contained string

Return: If the verification succeeds, true is returned; otherwise, false is returned.

 

*/

Function isFirstMatch (str1, str2)

{

Var index = str1.indexOf (str2 );

If (index = 0) return true;

Return false;

}

 

/*

Purpose: character 1 is a string containing 2

Input: str1: string; str2: contained string

Return: If the verification succeeds, true is returned; otherwise, false is returned.

 

*/

Function isMatch (str1, str2)

{

Var index = str1.indexOf (str2 );

If (index =-1) return false;

Return true;

}

 

 

/*

Purpose: Check whether the input start and end dates are correct. The rules are in the correct format for the two dates,

End on schedule> = Start Date

Input:

StartDate: start date, string

EndDate: end date, string

Return Value:

If the verification succeeds, true is returned. Otherwise, false is returned.

 

*/

Function checkTwoDate (startDate, endDate ){

If (! IsDate (startDate )){

Alert ("Incorrect start date! ");

Return false;

} Else if (! IsDate (endDate )){

Alert ("the end date is incorrect! ");

Return false;

} Else if (startDate> endDate ){

Alert ("the start date cannot be later than the end date! ");

Return false;

}

Return true;

}

 

/*

Purpose: Check whether the entered Email address format is correct.

Input:

StrEmail: String

Return Value:

If the verification succeeds, true is returned. Otherwise, false is returned.

 

*/

Function checkEmail (strEmail ){

// Var emailReg =/^ [_ a-z0-9] + @ ([_ a-z0-9] + \.) + [a-z0-9] {2, 3} $ /;

Var emailReg =/^ [\ w-] + (\. [\ w-] +) * @ [\ w-] + (\. [\ w-] +) + $ /;

If (emailReg. test (strEmail )){

Return true;

} Else {

Alert ("the Email address format you entered is incorrect! ");

Return false;

}

}

 

/*

Purpose: Check whether the entered phone number format is correct.

Input:

StrPhone: String

Return Value:

If the verification succeeds, true is returned. Otherwise, false is returned.

 

*/

Function checkPhone (strPhone ){

Var phoneRegWithArea =/^ [0] [1-9] {2, 3}-[0-9] {5, 10} $ /;

Var phoneRegNoArea =/^ [1-9] {1} [0-9] {5, 8} $ /;

Var prompt = "the phone number you entered is incorrect! "

If (strPhone. length> 9 ){

If (phoneRegWithArea. test (strPhone )){

Return true;

} Else {

Alert (prompt );

Return false;

}

} Else {

If (phoneRegNoArea. test (strPhone )){

Return true;

} Else {

Alert (prompt );

Return false;

}

 

 

}

}

 

 

/*

Purpose: Check the number of selected check boxes.

Input:

CheckboxID: String

Return Value:

Returns the number of selected items in the check box.

 

*/

 

Function checkSelect (checkboxID ){

Var check = 0;

Var I = 0;

If (document. all (checkboxID). length> 0 ){

For (I = 0; I

If (document. all (checkboxID). item (I). checked ){

Check + = 1;

}

 

 

 

 

}

} Else {

If (document. all (checkboxID). checked)

Check = 1;

}

Return check;

}

 

Function getTotalBytes (varField ){

If (varField = null)

Return-1;

 

Var totalCount = 0;

For (I = 0; I <varField. value. length; I ++ ){

If (varField. value. charCodeAt (I) & gt; 127)

TotalCount + = 2;

Else

TotalCount ++;

}

Return totalCount;

}

 

Function getFirstSelectedValue (checkboxID ){

Var value = null;

Var I = 0;

If (document. all (checkboxID). length> 0 ){

For (I = 0; I

If (document. all (checkboxID). item (I). checked ){

Value = document. all (checkboxID). item (I). value;

Break;

}

}

} Else {

If (document. all (checkboxID). checked)

Value = document. all (checkboxID). value;

}

Return value;

}

Function getFirstSelectedIndex (checkboxID ){

Var value =-2;

Var I = 0;

If (document. all (checkboxID). length> 0 ){

For (I = 0; I

If (document. all (checkboxID). item (I). checked ){

Value = I;

Break;

}

}

} Else {

If (document. all (checkboxID). checked)

Value =-1;

}

Return value;

}

Function selectAll (checkboxID, status ){

 

If (document. all (checkboxID) = null)

Return;

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