JS form validation encyclopedia_form effects

1. Only numbers and English can be entered:

2. Only numbers can be entered:
< ;input onkeyup="value=value.replace(/[^/d]/g,'') " onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^/ d]/g,''))" ID="Text2" NAME="Text2">
3. Only full-width input is possible:

4. Only Chinese characters can be input:

--------------------------------------------- ----------------------------------------
Verify illegal characters, sql
function vdf()
{
var i,j,name,value,message,length,type,a=vdf.arguments,cb_name;
for (i=0; i{
if (a[i].indexOf('#')!=-1)
{
name=fob(a[i]. substr(0,a[i].indexOf('#')));
cb_name=fob(a[i].substr((a[i].indexOf('#') 1),a[i ].length));
}
else
{
name=fob(a[i]); // Control name
}
message=a[i 1]; // Prompt message
type=a[i 2]; // Type
if (type!="r_time")
{
value=name.value.replace(/ /g, " "); // Control value
}
else
{
value=name.value;
}
}
---------- -------------------------------------------------- ------------------
// =============== Determine whether the check box is selected====== =========== //
if (type=="r_cb")
{
e=document.forms(0).elements;
var flag=false ;
for (i=0;i{
if (e[i]!=cb_name)
{
if (e[i].checked ==true)
{
flag=true;
break;
}
}
if (i==e.length-1)
{
break ;
}
}
if (flag==false)
{
alert(message "!/n"); //The prompt that appears when it is empty
return false;
}
}
// =============== Determine whether the drop-down box is selected ================ / /
if (type=="r_sl")
{
if (name.selected==false)
{
alert(message "!/n"); //Empty The prompt that appears when
return false;
}
}
// =============== Judgment that it cannot be empty ======= ========= //
if (type=="r")
{
if (value=="") // Determine whether it is empty
{
alert(message "!/n"); //The prompt that appears when it is empty
name.focus();
name.select();
return false;
}
}
// =============== Cannot be empty, but does not get focus ================ //
if (type=="o_r")
{
if (value=="") // Determine whether it is empty
{
alert(message "!/n"); / / Prompt that appears when it is empty
return false;
}
}
// =============== Only Chinese can be entered ===== =========== //
if (type=="r_china")
{
if (value.search(/^[/u4e00-/u9fa5] $/) ==-1)
{
alert(message "!/n"); // The judgment cannot be empty
name.focus();
name.select();
return false;
}
}
// =============== Cannot be empty, must be a number or character. ========== ====== //
if (type=="r_num_char")
{
if (value=="")
{
alert(message "!/n" ); //The prompt that appears when it is empty
name.focus();
name.select();
return false;
}
if (value.search(/^[ 0-9a-zA-Z] $/)==-1)
{
alert(message "!/n"); //The prompt that appears when it is empty
name.focus();
name.select();
return false;
}
}
// =============== Can be empty, not empty When, fill in the number ================ //
if (type=="num")
{
if (value.search(/^[ 0-9] $/)==-1 && value!="")
{
alert(message "!/n"); // The judgment cannot be empty
name.focus();
name.select();
return false;
}
}
// =============== cannot be empty, must be a number Judgment ================ //
if (type=="r_num")
{
if (value=="")
{
alert(message "!/n");
name.focus();
name.select();
return false;
}
if (value.search( /^[0-9] $/)==-1)
{
alert(message "!/n"); // The judgment cannot be empty
name.focus();
name.select();
return false;
}
}
// ===============Must enter a number less than n==== ============ //
if (type.indexOf("r_num{
length=type.substring((type.indexOf ('if (value=="") // Prompt for empty
{
alert(message "!/n");
name.focus();
name.select();
return false;
}
if (value.search(/^[0-9 ] $/)==-1) // Not made of numbers
{
alert(message "!/n");
name.focus();
name.select() ;
return false;
}
if (value.length>length) // Limit the length of the number
{
alert(message "!/n");
name.focus();
name.select();
return false;
}
}
// ===============Must enter a number greater than n================ //
if (type .indexOf("r_num>")!=-1)
{
length=type.substring((type.indexOf('>') 1),type.length); // Get the back of rnif (value=="") // Prompt for empty
{
alert(message "!/n");
name.focus();
name .select();
return false;
}
if (value.search(/^[0-9] $/)==-1) // Not made of numbers
{
alert(message "!/n");
name.focus();
name.select();
return false;
}
if (value.length{
alert(message "!/n");
name.focus();
name.select();
return false ;
}
}
// ===============Must enter a number between a-b ============= === //
if (type.indexOf("r_num#")!=-1)
{
length=type.substr((type.indexOf('>' ) 1),type.length);
length=length.substr(0,length.lastIndexOf("-"));
length1=type.substring((type.indexOf('-') 1) ,type.length) // Get the number after rnif (value=="") // Prompt for empty
{
alert(message "!/n");
name.focus();
name.select();
return false;
}
if (value.search(/^[0-9] $/)==-1) // Not a reminder made of numbers
{
alert(message "!/n");
name.focus();
name.select();
return false;
}
if (value.lengthlength1) // Limit the length of the number
{
alert(message "!/n");
name. focus();
name.select();
return false;
}
}
// =============== cannot be empty , must be of float type================ //
if (type=="r_float")
{
if (value=="")
{
alert(message "!/n");
name.focus();
name.select();
return false;
}
if ( value.search(/^[0-9] $/)!=-1 || value.search(/^([0-9] )|([0-9] /.[0-9]*)| ([0-9]*/.[0-9] )$/)!=-1)
{
return true;
}
else
{
alert( message "!/n"); // The judgment cannot be empty
name.focus();
name.select();
return false;
}
}
/ / =============== To determine the email, you do not have to enter ================ //
if (type.indexOf(" email")!=-1)
{
if (name.value!="")
{
if (value.search(/^[_/.a-z0-9] @[a-z0-9] [/.][a-z0-9]{2,}$/i)==-1)
{
alert(message "!/n");
name.focus();
name.select();
return false;
}
}
}
// ========== =====To determine email, be sure to enter================ //
if (type.indexOf("r_email")!=-1)
{
if (name.value=="")
{
alert(message "!/n");
name.focus();
name.select();
return false;
}
if (value.search(/^[_/.a-z0-9] @[a-z0-9] [/.][a-z0-9]{2 ,}$/i)==-1)
{
alert(message "!/n");
name.focus();
name.select();
return false;
}
}
// =============== Determine the date, such as 2000-12-20============ ===== //
if (type=="r_date")
{
flag=true;
getdate=value;
if (getdate.search(/^[0 -9]{4}-(0[1-9]|[1-9]|1[0-2])-((0[1-9]|[1-9])|1[0-9 ]|2[0-9]|3[0-1])$/)==-1) // Correct when judging the input format
{
flag=false;
}
else
{
var year=getdate.substr(0,getdate.indexOf('-')) // Get the year
// The following operation is to get the month
var transition_month=getdate.substr(0, getdate.lastIndexOf('-'));
var month=transition_month.substr(transition_month.lastIndexOf('-') 1,transition_month.length);
if (month.indexOf('0')== 0)
{
month=month.substr(1,month.length);
}
// The following operation is to obtain the date
var day=getdate.substr(getdate.lastIndexOf(' -') 1,getdate.length);
if (day.indexOf('0')==0)
{
day=day.substr(1,day.length);
}
//alert(month);
//alert(day)
//return false;
if ((month==4 || month==6 || month==9 || month==11) && (day>30)) // The dates in 4, 6, 9 and 11 months cannot exceed 30
{
flag=false;
}
if (month= =2) // Determine February
{
if (LeapYear(year))
{
if (day>29 || day}
else
{
if (day>28 || day}
}
else
{
flag=true ;
}
}
if (flag==false)
{
alert(message "!/n"); //The prompt that appears when it is empty
name.focus ();
name.select();
return false;
}
}
1. Length limit
<script> <BR>function test() <BR> { <BR>if(document.a.b.value.length>50) <BR>{ <BR>alert("Cannot exceed 50 characters!"); <BR>document.a.b.focus(); <BR>return false; <BR>} <BR>} <BR></script>

2. Can only be Chinese characters

3." It can only be in English


4. Can only be numbers


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

8. Twice Are the input passwords the same?

"input2">

<script> <BR>function check () <BR>{ <BR>with(document.all){ <BR>if(input1.value!=input2.value) <BR>{ <BR>alert("false") <BR>input1.value = ""; <BR>input2.value = ""; <BR>} <BR>else document.forms[0].submit(); <BR>} <BR>} <BR></script>
That’s enough :)
It’s cool to block the right click
oncontextmenu="return false" ondragstart="return false" onselectstart="return false"
Add to body
Two
2.1 Table Single item cannot be empty

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

2.3 Form items can only be numbers and "_", which are used for phone/bank account verification and can be extended to domain name registration, etc.
> ;
2.4 Form item input value/length limit
> ;
2.5 Chinese/English/numeric/email address validity judgment
> ;
2.6 Limit the characters that cannot be entered in form items

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

2. How to determine whether it is a character
---- ----------------------------------
if (/[^/x00-/xff]/ g.test(s)) alert("Contains Chinese characters");
else alert("All characters");
3. How to judge whether it contains Chinese 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: String to be checked
//Return value: 0: Not 1: Yes
function chkemail(a)
{ 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. Number format verification
---------------------------------------
//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 there are characters that are not Number
return 0;
}
}
//The description is 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 some characters are illegal
return 0;
}
}
//Explanation is legal
return 1;
}
7. Function to determine whether the input is Chinese
-------------------------- ------------------
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
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