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JS How to verify the mailbox, telephone, digital, postcode

Source: Internet
Author: User
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JS verification of the mailbox, telephone, digital, postcode HTML code:

<TITLE>JS Verification of mobile email </title>
<body>

The code is as follows Copy Code
<script language= "javascript" type= "Text/javascript" >
string.prototype.isnull=testnull;//to determine if it is empty
string.prototype.number=testnumber;//to judge numbers, only integers
string.prototype.doublenumber=testdoublenumber;//to judge the number, can be decimal
string.prototype.zip=testzip;//to judge the postal code format
string.prototype.phone=testphonenumber;//to determine the telephone number, fax format
string.prototype.email=testemail;//to judge the mailbox format
To determine if NULL, NULL to put back true
function Testnull ()
{
if (This.replace (^s*) | ( s*$)/g), ""). Length<=0)
{
Reurn true; is empty
}
Else
{
return false; is not empty
}
}



1. Determines whether a number is a number and returns True

The code is as follows Copy Code
function Testnumber ()
{
if (!this.isnull)
{
for (i=0;i<this.length;i++)
{
if (This.charat (i) < "0" | | this.charat (i) > "9")
{
return false;
}
}
return true;
}
Else
{
return true;
}
}



2. To determine the postal code format, return true correctly

The code is as follows Copy Code
function Textzip ()
{
if (!this.isnull)
{
if (this.length!=6)
{
return False
}
Else
{
var restel=/^[0-9]+$/;
if (!restel.test (this))
{
return false;
}
}
}
return true;
}

To determine the phone number, fax format, correctly put back true

The code is as follows Copy Code
function Testphonenumber ()
{
if (!this.isnull ())
{
var reg=/(^[0-9]{3,4}-[0-9]{7,8}-[0-9]{3-4$}) | (^[0-9]{3,4}-[0-9]{7-8}$) | (^[0-9]{7-8}-[0-9]{3,4}$) | (^[0-9]{7,15}$)/;
if (!reg.test (this))
{
return false;
}
return true;
}
Else
{
return true;
}
}



Determine e-mail format and return true in good form

The code is as follows Copy Code
function Testemail ()
{
if (!this.isnull ())
{
if (This.search (/^) ([-_a-za-z0-9.] +) @ ([_a-za-z0-9]+.) +[a-za-z0-9]{2,3}$/)!=-1)
{
return true;
}
return false;
}
Else
{
return true;
}
}

Determines whether a number, can be a decimal, and returns true in the correct format

The code is as follows Copy Code
function Testdoublenumber ()
{
var pointcount=0; Define a variable decimal point with an initial value of 0
for (Var i=0;i<this.length;i++)
{
if (This.charat (i) < "0" | | This.charat (i) > "9") &&this.charat (i)!= "."
{
return false;
}
Else
{
if (This.charat (i) = = '. ') pointcount++;
}
}
if (pointcount>1)
{
return false;
}
else if (Pointcount==1&&this.trim (). Length==1)//Judge the decimal point is only 1 digits, and the length is 1, there is only a small points, of course, return false
{
return false;
}
return true;
}
</body>

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Related Keywords:
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