Common simple JavaScript function _javascript techniques

Function Name: strbytelength
Feature Description: Returns the byte length of a string
Parameter description: str to check the string
return Value: String length
function Strbytelength (str)
{
var i,sum;
sum=0;
for (i=0;i<str.length;i++)
{
if ((Str.charcodeat (i) >=0) & (Str.charcodeat (i) <=255))
sum=sum+1;
Else
sum=sum+2;
}
return sum;
}
Function Name: fucchecklength
Function Description: Check whether the form meets the specified length
Parameter description: obj to check the form object
Name object names
Length specified lengths
return value: TRUE (compliant) or false (inconsistent)
function fucchecklength (obj, name, length)
{
var i,sum;
sum=0;
var strtemp = Obj.value;
for (i=0;i<strtemp.length;i++)
{
if ((Strtemp.charcodeat (i) >=0) & (Strtemp.charcodeat (i) <=255))
sum=sum+1;
Else
sum=sum+2;
}
if (sum<=length)
{
return true;
}
Else
{
Alert (name+) exceeds the specified length! Maximum allowable "+length+" character (Chinese count 2 digits)! ");
Obj.focus ();
return false;
}
}
Detect if e-mail is legal
function Checkemail (Object)
{
var pattern =/^[.-_a-za-z0-9]+@ ([-_a-za-z0-9]+\.) +[a-za-z0-9]{2,3}$/;
var Strvalue=object.value;
if (Strvalue.match (pattern) ==null) {
Alert ("Email is not valid, please fill in again!") ");
Object.focus ();
return false;
}else{
return true;
}
}
Go to the empty partition function
function Jtrim (str) {
var i = 0;
var len = str.length;
if (str = = "") return (str);
j = len-1;
Flagbegin = true;
Flagend = true;
while (Flagbegin = = True & i< len) {
if (Str.charat (i) = = "") {
i=i+1;
Flagbegin=true;
}else{
Flagbegin=false;
}
}
while (flagend== True & j>=0) {
if (Str.charat (j) = "") {
J=j-1;
Flagend=true;
}else{
Flagend=false;
}
}
if (i > J) return ("")
Trimstr = str.substring (i,j+1);
return trimstr;
}
Function Name: JTRIMCN
Feature Description: Remove the space before and after the string [including Chinese spaces]
Parameter description: str the string to manipulate
Return value: A string that has been removed before and after spaces [including Chinese spaces]
function JTRIMCN (str) {
var i = 0;
if (str = NULL | | | str = undefined) {
Return "";
}
var len = str.length;
if (str = = "") {
return (str);
}
j = len-1;
Flagbegin = true;
Flagend = true;
while (Flagbegin = = True & i< len) {
if (Str.charat (i) = = "" | | Str.charat (i) = = "") {
i=i+1;
Flagbegin=true;
}else{
Flagbegin=false;
}
}
while (flagend== True & j>=0) {
if (Str.charat (j) = = "" | | Str.charat (j) = = "") {
J=j-1;
Flagend=true;
}else{
Flagend=false;
}
}
if (i > J) {
Return ("")
}
var trimstr = str.substring (i,j+1);
return trimstr;
}
0-9,A-Z,A-Z Specification character judgment
function Ischar (STR) {
var Regu = "^ ([0-9a-za-z]+) $";
var re = new RegExp (Regu);
if (Str.search (re)!=-1) {
return true;
}
return false;
}
Judge whether the number
function Isnum (STR) {
var Regu = "^ ([0-9]+) $";
var re = new RegExp (Regu);
if (Str.search (re)!=-1)
return true;
{
return false;
}
}
Function Name: Funcisnotempty
Feature Description: Check whether the string is empty
Parameter description: str string
Return value: true: null false: null
function Funcisnotempty (str) {
var s =/\s/;
if (str==null) {
return false;
}
return S.test (str);
}
Function Name: fucchecklength
Function Description: Check whether the form meets the specified length
Parameter description: ObjValue The value of the form object to check
Name object names
Minlen Minimum Length
MaxLen Maximum Length
return value: TRUE (compliant) or false (inconsistent)
function FUCCHECKLENGTHB (ObjValue, Minlen, MaxLen)
{
var i,sum;
sum=0;
var strtemp = ObjValue;
for (i=0;i<strtemp.length;i++)
{
if ((Strtemp.charcodeat (i) >=0) & (Strtemp.charcodeat (i) <=255))
sum=sum+1;
Else
sum=sum+2;
}
if (Sum<=maxlen & sum >= minlen)
{
return true;
}
Else
{
return false;
}
}
SDate1 and SDate2 are the 2002-12-18 format
function Fundatediff (sDate1, SDate2) {
var adate, oDate1, ODate2, idays;
Adate = Sdate1.split ("-");
Convert to 12-18-2002 format
oDate1 = new Date (adate[1] + '-' + adate[2] + '-' + adate[0 ');
Adate = Sdate2.split ("-");
ODate2 = new Date (adate[1] + '-' + adate[2] + '-' + adate[0 ');
Converts the difference in milliseconds to days
Idays = parseint (Math.Abs (odate1-odate2)/1000/60/60/24);
If the start time is less than the end time
if (SDate1 > SDate2)
{
Return ( -1 * idays);
}
return idays;
}
Detect if e-mail is legal
function Funccheckemail (strvalue)
{
var pattern =/^[.-_a-za-z0-9]+@ ([-_a-za-z0-9]+\.) +[a-za-z0-9]{2,3}$/;
if (Strvalue.match (pattern) ==null) {
return false;
}else{
return true;
}
}
Function Name: fuccheckmaxlength
Function Description: Check whether the form meets the specified length
Parameter description: ObjValue The value of the form object to check
Name Object value
MaxLen Maximum Length
return value: TRUE (compliant) or false (inconsistent)
function Fuccheckmaxlength (ObjValue, MaxLen)
{
Return FUCCHECKLENGTHB (objvalue, 0, MaxLen);
}
Function Name: fuccheckmaxlength
Function Description: Check the value of the specified object to meet the prescribed length
Parameter description: ObjValue The value of the form object to check
Name Object
MaxLen Maximum Length
return value: TRUE (compliant) or false (inconsistent)
function fuccheckobjmaxlength (obj, maxlen)
{
if (obj = = null) {
return false;
}
Return FUCCHECKLENGTHB (obj.value, 0, MaxLen);
}
Function Name: Funccheckinvalidchar
Function Description: Determine whether the specified field has illegal characters <>
Parameter description: obj to check the form object
return value: True (not) or false (with)
function Funccheckinvalidchar (obj)
{
if (obj = null | | obj.value== "")
{
return true;
}
alert (Obj.value);
var pattern =/[<>]/;
if (Pattern.test (Obj.value)) {
return false;
}else{
return true;
}
}
/**
* Determines whether the maximum length of the object for the specified ID is correct
* Param:objid Object ID
* MaxLength Maximum length
* Return:true correct, false incorrect
*/
function lengthmaxcheckmsg (ObjID, MaxLength, objname, Needfocus, showmsg) {
Personal information check
var obj = document.getElementById (ObjID);
if (!fuccheckobjmaxlength (obj, maxLength)) {
if (showmsg = null | | showmsg== "") {
Alert (objname + "can only enter" + (MAXLENGTH/2) + "kanji (or" + maxLength + "English digit)");
} else {
alert (showmsg);
}
if (Needfocus) {
Obj.focus ();
}
return false;
}
return true;
}
/**
* Determine if the object of the specified ID contains illegal characters
* Param:objid Object ID
* Name of the ObjName object
* Whether the needfocus need to set the focus
* ShowMsg the error message displayed
* Return:true correct, false incorrect
*/
function invalidcharcheckmsg (ObjID, Objname,needfocus, showmsg) {
Personal information check
var obj = document.getElementById (ObjID);
if (!funccheckinvalidchar (obj)) {
if (showmsg = null | | showmsg== "") {
Alert (objname + ' cannot contain "<" or ">");
} else {
alert (showmsg);
}
if (Needfocus) {
Obj.focus ();
}
return false;
}
return true;
}
/**
* Determine if the object of the specified ID is empty
* Param:objid Object ID
* Name of the ObjName object
* Whether the needfocus need to set the focus
* ShowMsg the error message displayed
* Return:true is not NULL, FALSE is NULL
*/
function emptycheckmsg (ObjID, Objname,needfocus, showmsg) {
Personal information check
var obj = document.getElementById (ObjID);
if (!funcisnotempty (Obj.value)) {
if (showmsg = null | | showmsg== "") {
Alert (objname + ' cannot be empty!) ');
} else {
alert (showmsg);
}
if (Needfocus) {
Obj.focus ();
}
return false;
}
return true;
}
/* Date Calculation function
* Date 2007-01-01
* CNT 1 Or-1
* Return 2007-01-02
*/
function getDate (date, CNT) {
if (date.length!=10) {
Return "";
}
var Datearray = Date.split ("-")
if (datearray==null) {
Return "";
}
var temdate = new Date (datearray[0], datearray[1]-1, datearray[2]);
var newdate = DATE.UTC (Temdate.getyear (), Temdate.getmonth (), Temdate.getdate ())
Newdate = Newdate + (cnt*24*60*60*1000);
Newdate = new Date (newdate);
var month = Newdate.getmonth () +1;
var day = Newdate.getdate ();
if (number (month) <10)
month = "0" +month;
if (number (day) <10)
Day = "0" +day;
var retdate = newdate.getyear () + "-" + month + "-" + day;
return retdate;
}