Js verification Overview

Keywords: js verification form Daquan, use JS to control form submission, javascript to submit form:
Directory:
1: js string length limit, determination character length, js restriction input, restriction not input, textarea length limit
2.: js judges Chinese characters, determines whether Chinese characters are needed, and can only input Chinese Characters
3: js determines whether the input is in English. Only English can be entered.
4: javascript can only enter numbers, determine numbers, verify numbers, detect numbers, determine whether they are numbers, and only enter numbers
5: Only English characters and numbers can be entered
6: js email verification, js judgment email, mailbox/mailbox format Verification
7: js character filtering, blocking keywords
8: js password verification and password Determination
2.1: js is not empty, empty, or not an object. The judgment is empty. The judgment is not empty.
2.2: compare whether the values of two form items are the same
2.3: The form can only contain numbers and "_",
2.4: Number/length limit entered for Form Items
2.5: Chinese/English/number/email address legality judgment
2.6: Restrict characters that cannot be entered for Form Items
2.7 form User Control
2.8: Common verification functions for form text fields

1. length limit
<Script>
Function test ()
{
If (document. a. B. value. length> 50)
{
Alert ("cannot exceed 50 characters! ");
Document. a. B. focus ();
Return false;
}
}
</Script>
<Form name = a onsubmit = "return test ()">
<Textarea name = "B" cols = "40" wrap = "VIRTUAL" rows = "6"> </textarea>
<Input type = "submit" name = "Submit" value = "check">
</Form>

2. Only Chinese characters are allowed
<Input onkeyup = "value ="/oblog/value. replace (/[^ \ u4E00-\ u9FA5]/g, '')">

3. "English only
<Script language = javascript>
Function onlyEng ()
{
If (! (Event. keyCode> = 65 & event. keyCode <= 90 ))
Event. returnvalue = false;
}
</Script>

<Input onkeydown = "onlyEng ();">

4. Only numbers are allowed.
<Script language = javascript>
Function onlyNum ()
{
If (! (Event. keyCode> = 48 & event. keyCode <= 57) | (event. keyCode> = 96 & event. keyCode <= 105 )))
// Consider the numeric keys on the keypad
Event. returnvalue = false;
}
</Script>

<Input onkeydown = "onlyNum ();">

5. Only English characters and numbers are allowed.
<Input onkeyup = "value ="/oblog/value. replace (/[\ W]/g, "'') "onbeforepaste =" clipboardData. setData ('text', clipboardData. getData ('text '). replace (/[^ \ d]/g, '')">

6. Verify the fuel tank format
<Script language = javascript RUNAT = Server>
Function isEmail (strEmail ){
If (strEmail. search (/^ \ w + (-\ w +) | (\. \ w +) * \ @ [A-Za-z0-9] + ((\. |-) [A-Za-z0-9] + )*\. [A-Za-z0-9] + $ /)! =-1)
Return true;
Else

Alert ("oh ");
}
</SCRIPT>
<Input type = text onblur = isEmail (this. value)>

7. Shielding keywords (here, shielding ***** and ****)
<Script language = "javascript1.2">
Function test (){
If (. b. value. indexOf ("***") = 0) | (. b. value. indexOf ("***") = 0 )){
Alert (":)");
A. B. focus ();
Return false ;}
}
</Script>
<Form name = a onsubmit = "return test ()">
<Input type = text name = B>
<Input type = "submit" name = "Submit" value = "check">
</Form>

8. Whether the two passwords are the same
<Form method = post action = "">
<Input type = "password" id = "input1">
<Input type = "password" id = "input2">
<Input type = "button" value = "test" onclick = "check ()">
</FORM>
<Script>
Function check ()
{
With (document. all ){
If (input1.value! = Input2.value)
{
Alert ("false ")
Input1.value = "";
Input2.value = "";
}
Else document. forms [0]. submit ();

}
}
</Script>
Enough :)
Blocking right-click is cool
Oncontextmenu = "return false" ondragstart = "return false" onselectstart = "return false"
Add to body

II

2.1 Form items cannot be blank

<Script language = "javascript">
<! --
Function CheckForm ()
{
If (document. form. name. value. length = 0 ){
Alert ("enter your name! ");
Document. form. name. focus ();
Return false;
}
Return true;
}
-->
</Script>

2.2 compare whether the values of the two form items are the same

<Script language = "javascript">
<! --
Function CheckForm ()
If (document. form. PWD. value! = Document. form. PWD_Again.value ){
Alert ("the password you entered twice is different! Enter again .");
Document. ADDUser. PWD. focus ();
Return false;
}

Return true;
}
-->
</Script>

2.3 form items can only be numbers and "_", used for phone/Bank Account Verification, and can be extended to domain name registration.

<Script language = "javascript">
<! --
Function isNumber (String)
{
Var Letters = "1234567890-"; // you can add input values by yourself.
Var I;
Var c;
If (String. charAt (0) = '-')
Return false;
If (String. charAt (String. length-1) = '-')
Return false;
For (I = 0; I <String. length; I ++)
{
C = String. charAt (I );
If (Letters. indexOf (c) <0)
Return false;
}
Return true;
}
Function CheckForm ()
{
If (! IsNumber (document. form. TEL. value )){
Alert ("your phone number is invalid! ");
Document. form. TEL. focus ();
Return false;
}
Return true;
}
-->

</Script>

2.4 form entry input value/length limit

<Script language = "javascript">
<! --
Function CheckForm ()
{
If (document. form. count. value> 100 | document. form. count. value <1)
{
Alert ("the input value cannot be less than zero or greater than 100! ");
Document. form. count. focus ();
Return false;
}
If (document. form. MESSAGE. value. length <10)
{
Alert ("the input text is less than 10! ");
Document. form. MESSAGE. focus ();
Return false;
}
Return true;
}
// -->
</Script>

2.5 Determination of validity of Chinese/English/numbers/email addresses

<Script language = "javascript">
<! --

Function isEnglish (name) // english value detection
{
If (name. length = 0)
Return false;
For (I = 0; I <name. length; I ++ ){
If (name. charCodeAt (I)> 128)

Return false;
}
Return true;
}

Function isChinese (name) // Chinese value detection
{
If (name. length = 0)
Return false;
For (I = 0; I <name. length; I ++ ){
If (name. charCodeAt (I)> 128)
Return true;
}
Return false;
}

Function isMail (name) // E-mail value detection
{
If (! IsEnglish (name ))
Return false;
I = name. indexOf ("");
J = name dot lastIndexOf ("");
If (I =-1)
Return false;
If (I! = J)
Return false;
If (I = name dot length)
Return false;
Return true;
}

Function isNumber (name) // value detection
{
If (name. length = 0)
Return false;
For (I = 0; I <name. length; I ++ ){

If (name. charAt (I) <"0" | name. charAt (I)> "9 ")
Return false;
}
Return true;
}

Function CheckForm ()
{
If (! IsMail (form. Email. value )){
Alert ("your email is invalid! ");
Form. Email. focus ();
Return false;
}
If (! IsEnglish (form. name. value )){
Alert ("the English name is invalid! ");
Form. name. focus ();
Return false;
}
If (! IsChinese (form. cnname. value )){
Alert ("invalid Chinese name! ");
Form. cnname. focus ();
Return false;
}
If (! IsNumber (form. PublicZipCode. value )){
Alert ("the zip code is invalid! ");
Form. PublicZipCode. focus ();
Return false;
}
Return true;
}
// -->
</SCRIPT>

2.6 restrict characters that cannot be entered for Form Items

<Script language = "javascript">

<! --

Function contain (str, charset) // string contains the test function
{
Var I;
For (I = 0; I <charset. length; I ++)
If (str. indexOf (charset. charAt (I)> = 0)
Return true;
Return false;
}

Function CheckForm ()
{
If (contain (document. form. NAME. value, "% \ (\)> <") | (contain (document. form. MESSAGE. value, "% \ (\)> <")))
{
Alert ("illegal characters entered ");
Document. form. NAME. focus ();
Return false;
}
Return true;
}
// -->
</Script>

1. check whether a string is composed of digits.
---------------------------------------
<Script language = "Javascript"> <! --
Function checkNum (str) {return str. match (/\ D/) = null}
Alert (checkNum ("1232142141 "))
Alert (checkNum ("123214214a1 "))
// --> </Script>

2. How to determine whether it is a character
---------------------------------------
If (/[^ \ x00-\ xff]/g. test (s) alert ("containing Chinese characters ");
Else alert ("All characters ");

4. Email format Verification
---------------------------------------
// Function name: chkemail
// Function Description: Check whether the Email Address is used
// Parameter description: the string to be checked
// Return value: 0: Not 1: Yes
Function chkemail ()
{Var I = a. length;
Var temp = a. indexOf ('@');
Var tempd = a. indexOf ('.');
If (temp> 1 ){
If (I-temp)> 3 ){
If (I-tempd)> 0 ){
Return 1;
}

}
}
Return 0;
}

5. digit format Verification
---------------------------------------
// Function name: fucCheckNUM
// Function Description: Check whether it is a number
// Parameter description: number to be checked
// Return value: 1 is a number, and 0 is not a number
Function fucCheckNUM (NUM)
{
Var I, j, strTemp;
StrTemp = "0123456789 ";
If (NUM. length = 0)
Return 0
For (I = 0; I <NUM. length; I ++)
{
J = strTemp. indexOf (NUM. charAt (I ));

If (j =-1)
{
// It indicates that the character is not a number.
Return 0;
}
}
// The description is a number.
Return 1;
}

6. Phone Number Format Verification
---------------------------------------
// Function name: fucCheckTEL
// Function Description: Check whether the phone number is used
// Parameter description: the string to be checked
// Return value: 1 is valid, 0 is invalid
Function fucCheckTEL (TEL)
{
Var I, j, strTemp;
StrTemp = "0123456789 -()#";
For (I = 0; I <TEL. length; I ++)
{
J = strTemp. indexOf (TEL. charAt (I ));
If (j =-1)
{
// The specified character is invalid.
Return 0;
}
}
// Valid description
Return 1;
}

7. functions that determine whether the input is Chinese
---------------------------------------
Function ischinese (s ){

Var ret = true;
For (var I = 0; I <s. length; I ++)
Ret = ret & (s. charCodeAt (I) >= 10000 );
Return ret;
}

8. Comprehensive function for determining the legality of user input
---------------------------------------
<Script language = "javascript">
// Limit the start of the number of characters
// M is the user input, and n is the number of digits to be limited
Function issmall (m, n)
{
If (m <n) & (m> 0 ))
{
Return (false );
}
Else
{Return (true );}
}

9. Determine if the password is consistent
---------------------------------------
Function issame (str1, str2)
{
If (str1 = str2)
{Return (true );}
Else
{Return (false );}
}

10. Determine whether the user name is a hyphen (/) with numbers or letters
---------------------------------------
Function notchinese (str ){
Var reg =/[^ A-Za-z0-9 _]/g
If (reg. test (str )){

Return (false );
} Else {
Return (true );}
}