JS Classic Source: Generic JavaScript script function library

javascript|js| Function | Scripting JavaScript can play a big role in web programming by writing some of the most common features into JavaScript libraries.

Save the following code as Common.js

Class Library Features:

　　1.Trim (str)--Remove the spaces on either side of the string

　　2.XMLEncode (str)--XML encoding of strings

　　3.ShowLabel (STR,STR)--Mouse prompt function (display character, prompt character)

You can set the font, color, size, and hint background color, border, and so on for the text displayed

　　4.IsEmpty (obj)--Verifying that the input box is empty

　　5.IsInt (Objstr,sign,zero)--verifies if it is an integer, a positive integer, a negative integer, and whether it includes 0

　　6.IsFloat (Objstr,sign,zero)--Verify that the floating-point number, positive floating-point, negative floating-point, and whether to include 0

　　7.IsEnLetter (objstr,size)--Verify if 26 letters, small capitalization

The source code is as follows:

/*

Name: Common.js

Function: Generic JavaScript script function library

Including:

1.Trim (str)--Remove the spaces on either side of the string

2.XMLEncode (str)--XML encoding of strings

3.ShowLabel (STR,STR)--Mouse prompt function (display character, prompt character)

4.IsEmpty (obj)--Verifying that the input box is empty

5.IsInt (Objstr,sign,zero)--Verifying whether an integer

6.IsFloat (Objstr,sign,zero)--Verify that it is a floating-point number

7.IsEnLetter (objstr,size)--Verify that it is 26 letters

*/

/* String operation

Trim (String): Remove spaces on both sides of a string

*/

/*

1. LTrim (String): Removing space on the left

*/

function LTrim (str)

{

var whitespace = new String ("\t\n\r");

var s = new String (str);

if (Whitespace.indexof (S.charat (0))!=-1)

{

var j=0, i = s.length;

while (J < i && Whitespace.indexof (S.charat (j))!=-1)

{

j + +;

}

s = s.substring (j, I);

}

return s;

}

/*

2. RTrim (String): Remove the space on the right

*/

function RTrim (str)

{

var whitespace = new String ("\t\n\r");

var s = new String (str);

if (Whitespace.indexof (S.charat (s.length-1))!=-1)

{

var i = s.length-1;

while (i >= 0 && whitespace.indexof (s.charat (i))!=-1)

{

i--;

}

s = s.substring (0, i+1);

}

return s;

}

/*

3. Trim (String): Remove before and after spaces

*/

function Trim (str)

{

Return RTrim (LTrim (str));

}

/*

Xmlencode (String): XML Encoding of strings

*/

function Xmlencode (str)

{

Str=trim (str);

Str=str.replace ("&", "&");

Str=str.replace ("<", "<");

Str=str.replace (">", ">");

Str=str.replace ("'", "" ");

Str=str.replace ("\" "," "");

return str;

}

/*

Validating class functions

*/

function IsEmpty (obj)

{

Obj=document.getelementsbyname (obj). Item (0);

if (Trim (obj.value) = "")

{

Alert ("field cannot be empty.) ");

if (Obj.disabled==false && obj.readonly==false)

{

Obj.focus ();

}

}

}

/*

Isint (String,string,int or string):(test string, + or-or empty,empty or 0)

Function: To determine whether an integer, positive integer, negative integer, positive integer +0, negative integer +0

*/

function Isint (Objstr,sign,zero)

{

var reg;

var Bolzero;

if (Trim (OBJSTR) = "")

{

return false;

}

Else

{

Objstr=objstr.tostring ();

}

if ((sign==null) | | (Trim (sign) = ""))

{

Sign= "+-";

}

if ((zero==null) | | (Trim (zero) = "")

{

Bolzero=false;

}

Else

{

Zero=zero.tostring ();

if (zero== "0")

{

Bolzero=true;

}

Else

{

Alert ("Check for 0 parameters, only (empty, 0)");

}

}

Switch (sign)

{

Case "+-":

Integer

reg=/(^-?| ^\+?) \d+$/;

Break

Case "+":

if (!bolzero)

{

Positive integer

Reg=/^\+? [0-9]*[1-9][0-9]*$/;

}

Else

{

Positive integer +0

reg=/^\+?\d+$/;

Reg=/^\+? [0-9]*[0-9][0-9]*$/;

}

Break

Case "-":

if (!bolzero)

{

Negative integer

reg=/^-[0-9]*[1-9][0-9]*$/;

}

Else

{

Negative integer +0

reg=/^-\d+$/;

reg=/^-[0-9]*[0-9][0-9]*$/;

}

Break

Default

Alert ("Check symbol parameters, only (empty, +,-)");

return false;

Break

}

var r=objstr.match (REG);

if (r==null)

{

return false;

}

Else

{

return true;

}

}

/*

Isfloat (String,string,int or string):(test string, + or-or empty,empty or 0)

Function: To determine whether it is floating point number, positive floating-point number, negative floating-point number, positive floating-point number +0, negative float +0

*/

function Isfloat (Objstr,sign,zero)

{

var reg;

var Bolzero;

if (Trim (OBJSTR) = "")

{

return false;

}

Else

{

Objstr=objstr.tostring ();

}

if ((sign==null) | | (Trim (sign) = ""))

{

Sign= "+-";

}

if ((zero==null) | | (Trim (zero) = "")

{

Bolzero=false;

}

Else

{

Zero=zero.tostring ();

if (zero== "0")

{

Bolzero=true;

}

Else

{

Alert ("Check for 0 parameters, only (empty, 0)");

}

}

Switch (sign)

{

Case "+-":

Floating point numbers

reg=/^ ((-?| \+?) \d+) (\.\d+) $/;

Break

Case "+":

if (!bolzero)

{

Positive floating-point numbers

Reg=/^\+? ([0-9]+\. [0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\. [0-9]+) | ([0-9]*[1-9][0-9]*)] $/;

}

Else

{

Positive floating-point number +0

Reg=/^\+?\d+ (\.\d+) $/;

}

Break

Case "-":

if (!bolzero)

{

Negative floating-point numbers

reg=/^-([0-9]+\.[ 0-9]*[1-9][0-9]*) | ([0-9]*[1-9][0-9]*\. [0-9]+) | ([0-9]*[1-9][0-9]*)] $/;

}

Else

{

Negative floating-point number +0

reg=/^ (-\d+ (\.\d+)?) | (0+ (\.0+)) $/;

}

Break

Default

Alert ("Check symbol parameters, only (empty, +,-)");

return false;

Break

}

var r=objstr.match (REG);

if (r==null)

{

return false;

}

Else

{

return true;

}

}