JavaScript form validation encyclopedia-JS Tutorial-php.cn

2. Can only be Chinese characters

3. Only Can it be in English

;=96&&event.keyCode<=105)))

//Consider the numeric keys on the small keyboard

event.returnvalue=false;

}

5. Only in English Characters and numbers

6. Verify email format

7. Block keywords ( *** and **** are blocked here)

<script> function test() { if((a.b.value.indexOf ("***") == 0)||(a.b.value.indexOf ( "****") == 0)){ alert(":)");a.b.focus();return false;}}</script>

8. Are the passwords entered twice the same?

2.5 Chinese/English/numeric/email address validity judgment

<SCRIPT>  </SCRIPT>

2.6 Limit the characters that cannot be entered in the form item

1. Check whether a string consists entirely of numbers
------------- ---------------------------

& lt; script & gt; & lt;!-
Function Checknum (STR) {Return Str.match ( +
---------------------------------------
if (/[^x00-xff]/ g.test(s)) alert("Contains Chinese characters");
else alert("All characters"); --------------------------
if (escape(str).indexOf("%u")!=-1) alert("Contains Chinese characters ");
else alert("All characters");

4. Email format verification
----------------------------- -----------
//Function name: chkemail
//Function introduction: Check whether it is an Email Address
//Parameter description: The string to be checked
//Return value: 0: not 1 ：Yes
function chkemail(a)

{ var i=a.length;

//Function name: fucCheckNUM

//Function introduction: Check whether it is a number
//Parameter description: The number to be checked
//Return value: 1 means it is a number, 0 means it is not a number
function fucCheckNUM(NUM)

{

var i,j,strTemp;
strTemp="0123456789";
if (NUM.length== 0)
return 0
for (i=0;i{
j=strTemp.indexOf(NUM.charAt(i) );
if (j==-1)
{
//Indicates that the character is not a number
return 0;
}
}
//Indicates that it is a number
return 1;
}

6. Phone number format verification
---------------------------------------------
// Function name: fucCheckTEL
//Function introduction: Check whether it is a phone number
//Parameter description: The string to be checked
//Return value: 1 is legal, 0 is illegal
function fucCheckTEL(TEL)
{
var i,j,strTemp;
strTemp="0123456789-()# ";
for (i=0;i{
j=strTemp.indexOf(TEL.charAt(i));
if (j==-1)
{
//Indicates that the characters are illegal
return 0;
}
}
//Indicates that it is legal www.2cto.com
return 1;
}

7. Determine whether the input is a Chinese function
---------------------------------------------
function ischinese(s) {
var ret=true;
for(var i=0;iret=ret && (s.charCodeAt(i)>=10000);
return ret;
}

8 . Comprehensive function to judge the legality of user input
------------------------------------------------ -
<script> //Start by limiting the number of digits to be entered //m is user input, 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 whether the passwords are entered consistently ------------ -------------------------- function issame(str1,str2) { if (str1==str2) {return(true );} else {return(false);} } 10. Determine whether the user name is a numeric letter underline --------------------- ------------------ function notchinese(str){ var reg=/[^A-Za-z0-9_]/g if (reg.test(str )){ return (false); }else{ return(true); } } 11. General verification function for form text field -------------------------- -------------------------- Function: Detect all input text that must be non-empty, such as name, account number, email address, etc. This check is now only for the text field. If you want to target other field objects in the form, you can change the judgment conditions. How to use: Add title text to the text field to be detected. The text is the prompt information. You want to prompt the Chinese name of the field to the user. For example, if you want to detect username html as follows <input title="Name">, of course, it is best to use a visual tool such as Dreamweaver to edit the domain. If you want to detect numeric type data, then unify the domain ID to sz. It is troublesome for JavaScript to determine the date type, so there is no program for date type verification. Experts can add. The program is relatively crude, I just provide an idea. Throw some bricks to attract good news! :) Oh, by the way, function calling method: < form> function dovalidate() { fm=document.forms[0] //Only detect one form, if there are multiple, you can change the judgment condition for (i=0;i<fm.length;i++) { //Detection and judgment conditions, which can be modified according to different types if(fm[i].tagName.toUpperCase()=="INPUT" &&fm[i]. type.toUpperCase()=="TEXT" && (fm[i].title!="")) if(fm[i].value="/blog/="")// { str_warn1= fm[i].title+"Can't be empty!"; alert(str_warn1); fm[i].focus(); return false; } if(fm[i].id.toUpperCase()== "SZ")//Digital verification fm[i] .focus(); return false; <script> <! -- function CheckForm() { if (document.form.name.value.length == 0) { alert("Please enter your name!"); document.form.name.focus(); return false; }return true;} --></script>

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

2.3 Form items can only be numbers and "_", used for phone/bank account verification, can be extended to domain name registration, etc.

2.4 Form item input value/length limit

2.5 Chinese/English/numeric/email address is legal Sex judgment

<SCRIPT>  </SCRIPT>

2.6 Limit the characters that cannot be entered in the form item