Copy Code code as follows:
/**
* Get Chinese and English characters
* @param {} str
* @return {}
*/
function LENGTHB (str) {
var p1 = new RegExp ('%u ... ', ' g ')
var P2 = new RegExp ('%. ', ' G ')
return Escape (str). replace (P1, '). Replace (P2, '). length
}
/**
* Filter all whitespace characters
* @param {Object} str
*/
function Jstrim (str) {
STR + + "";
while ((Str.charat (0) = = ") | | (Str.charat (0) = = '??? ') || (Escape (Str.charat (0)) = = '%u3000 ')
str = str.substring (1, str.length);
while ((Str.charat (str.length-1) = = ") | | (Str.charat (str.length-1) = '??? ') || (Escape (Str.charat (str.length-1)) = = '%u3000 ')
str = str.substring (0, str.length-1);
return str;
}
/**
* Filter Intermediate string and multiple spaces
* @param {Object} inputstring
*/
function Trim (inputstring) {
if (typeof inputstring!= "string") {
return inputstring;
}
var retvalue = inputstring;
var ch = retvalue.substring (0, 1);
while (ch = = "") {
Check the space at the beginning of the string
RetValue = retvalue.substring (1, retvalue.length);
ch = retvalue.substring (0, 1);
}
ch = retvalue.substring (retvalue.length-1, retvalue.length);
while (ch = = "") {
Check for spaces in end of string
RetValue = retvalue.substring (0, retvalue.length-1);
ch = retvalue.substring (retvalue.length-1, retvalue.length);
}
while (Retvalue.indexof ("")!=-1) {
Make multiple contiguous spaces in the middle of text into a single space
RetValue = retvalue.substring (0, Retvalue.indexof ("")) + retvalue.substring (Retvalue.indexof ("") + 1, retValue.length) ;
}
return retvalue;
}
/**
* Filter the string, specify the filter content, and if the content is empty, the default filter ' ~!@#$%^&* ()-+.
* @param {Object} str
* @param {Object} filterstr
*
* @return contains filtered content, returns True, otherwise returns false;
*/
function Filterstr (str, FILTERSTR) {
Filterstr = Filterstr = = ""? " ~!@#$%^&* ()-+.\ "": filterstr
var ch;
var i;
var temp;
var error = false;//Returns True when illegal characters are included
for (i = 0; I <= (filterstr.length-1); i++) {
ch = filterstr.charat (i);
temp = str.indexof (CH);
if (temp!=-1) {
Error = TRUE;
Break
}
}
return error;
}
/**
* Filter the specified content string
* @param {Object} str check string
* @param {Object} filterstr filter string, the content is empty, the default filter ' ~!@#$%^&* ()-+. '
* @param {Object} alertstr Popup Dialog content
* @param {Object} idstr error returns a typo segment ID
*/
function Isfilterstr (str, FILTERSTR, ALERTSTR, idstr) {
Alertstr = "Sorry, you enter" + Alertstr + "does not contain" + filterstr + "illegal character";
if (Filterstr (str, FILTERSTR))
This. Alertandrfalse (Alertstr, IDSTR);
}
/**
* Check whether the URL
* @param {} Str_url
* @param {} alertstr popup field contents
* @param {} idstr cursor positioned field id<b> can only receive id</b>
* @return {Boolean} <b> not </b> URL returns false;
*/
function Isurl (Str_url, Alertstr, idstr) {//Verify URL
Alertstr = alertstr + "incorrectly formatted!";
var Strregex = "^ (HTTPS|HTTP|FTP|RTSP|MMS)?:/ /)" +
"? ([0-9a-z_!~* ' (). &=+$%-]+:)? [0-9a-z_!~* ' (). &=+$%-]+@)? " user@ of FTP
+
"([0-9]{1,3}\.) {3} [0-9] {1,3} "//IP form of URL-199.194.52.184
+
"|"//Allow IP and domain (domains)
+
"([0-9a-z_!~* ' ()-]+\.) * "//Domain name-www."
+
"([0-9a-z][0-9a-z-]{0,61})?" [0-9a-z]\.] Level two domain name
+
[a-z]{2,6}]///the domain-. com or. Museum
+
"(: [0-9]{1,4}]?"//Port-: 80
+
"((/?)|" A slash isn ' t required if there is no file name
+
"(/[0-9a-z_!~* ' ().;?: @&=+$,%#-]+) +/?" $";
var re = new RegExp (Strregex);
if (!re.test (Str_url))
This. Alertandrfalse (Alertstr, IDSTR);
}
/**
* Check to see if email
* @param {} str
* @param {} alertstr popup field contents
* @param {} idstr cursor positioned field id<b> can only receive id</b>
* @return {Boolean} <b> not </b> e-mail returns false;
*/
function Isemail (str, ALERTSTR, IDSTR) {
Alertstr = alertstr + "incorrectly formatted!";
var re =/^ ([a-za-z0-9]+[_|\-|\.]?) *[a-za-z0-9]+@ ([a-za-z0-9]+[_|\-|\.]?) *[a-za-z0-9]+\. [A-za-z] {2,3}$/;
if (!re.test (str))
This. Alertandrfalse (Alertstr, IDSTR);
}
/**
* Check whether it is a number
* @param {} str
* @param {} alertstr popup field contents
* @param {} idstr cursor positioned field id<b> can only receive id</b>
* @return {Boolean} <b> not </b> number returns false;
*/
function Isnum (str, ALERTSTR, IDSTR) {
Alertstr = Alertstr + "should be made up of numbers!";
var re =/^[\d]+$/
if (!re.test (str))
This. Alertandrfalse (Alertstr, IDSTR);
}
/**
* Check whether the value is within a given range <br>
* @param {} str_num
* @param {} Morelen should be greater than or equal to the value
* @param {} Lesslen should be less than or equal to the value
* @param {} alertstr popup field contents
* @param {} idstr cursor positioned field id<b> can only receive id</b>
* @return {Boolean} <b> is less than the minimum value or greater than the maximum value </b> number returns false;
*/
function Israngenum (Str_num, Morelen, Lesslen, Alertstr, idstr) {
Isnum (Str_num, Alertstr, IDSTR);
if (Morelen!= "") {
Alertstr = Alertstr + "value can not be less than" + Morelen;
if (Str_num < Morelen)
This. Alertandrfalse (Alertstr, IDSTR);
}
if (Lesslen!= "") {
Alertstr = Alertstr + "Value cannot be greater than" + Lesslen;
if (Str_num > Lesslen)
This. Alertandrfalse (Alertstr, IDSTR);
}
if (Morelen = = "" && Lesslen = "")
This. Alertandrfalse ("No maximum minimum length is defined!", idstr);
}
/**
* Check for qualified strings (case-insensitive) <br>
* 6 to 20 bits in length, and is a string composed of a-z0-9_
* @param {} str check string
* @param {} alertstr popup field contents
* @param {} idstr cursor positioned field id<b> can only receive id</b>
* @return {Boolean} <b> not </b> "6 to 20 bits in length and a-z0-9_" returns false;
*/
function islicit (str, ALERTSTR, IDSTR) {
Alertstr = "Sorry," + Alertstr + "cannot be empty and can only be composed of 6 to 20 bits from 0 to 9 A to Z underline!";
var re =/^[_0-9a-za-z]{6,20}$/
if (!re.test (str))
This. Alertandrfalse (Alertstr, IDSTR);
}
/**
* Check whether two strings are equal
* @param {} str1 First string
* @param {} str2 Second string
* @param {} alertstr popup field contents
* @param {} idstr cursor positioned field id<b> can only receive id</b>
* @return {Boolean} string is not equal returns false;
*/
function Isstrequals (str1, str2, Alertstr, idstr) {
Alertstr = "two times" + Alertstr + "inconsistent!";
if (str1!= str2)
This. Alertandrfalse (Alertstr, IDSTR);
}
/**
* Check whether the string is within a given length (Chinese characters are calculated in 2 bytes) <br>
*
* @param {} str checked characters
* @param {} Morelen should be greater than or equal to the length
* @param {} Lesslen should be less than or equal to the length
* @param {} alertstr popup field contents
* @param {} idstr cursor positioned field id<b> can only receive id</b>
* @return {Boolean} <b> less than minimum length or greater than maximum length </b> number returns false;
*/
function Isrange (str, Morelen, Lesslen, Alertstr, idstr) {
var strLen = LENGTHB (str);
if (Morelen!= "") {
Alertstr = Alertstr + "should be greater than or equal to" + Morelen + "byte length!";
if (StrLen < Morelen)
This. Alertandrfalse (Alertstr, IDSTR);
}
if (Lesslen!= "") {
Alertstr = Alertstr + "should be less than or equal to" + Lesslen + "byte length!";
if (StrLen > Lesslen)
This. Alertandrfalse (Alertstr, IDSTR);
}
if (Morelen = = "" && Lesslen = "")
This. Alertandrfalse ("No maximum minimum length is defined!", idstr);
}
/**
* Check whether the string is less than the given length range (Chinese characters are calculated in 2 bytes) <br>
* @param {} str string
* @param {} Lesslen less than or equal to length
* @param {} alertstr popup field contents
* @param {} idstr cursor positioned field id<b> can only receive id</b>
* @return {Boolean} <b> greater than the given length </b> number returns false;
*/
function isless (str, Lesslen, ALERTSTR, idstr) {
Isrange (str, "", Lesslen, Alertstr, IDSTR);
}
/**
* Check the character is not empty
* @param {} str
* @param {} alertstr popup field contents
* @param {} idstr cursor positioned field id<b> can only receive id</b>
* @return {Boolean} <b> character is null </b> returns false;
*/
function IsEmpty (str, ALERTSTR, IDSTR) {
Alertstr = Alertstr + "cannot be empty!";
if (str = "")
This. Alertandrfalse (Alertstr, IDSTR);
}
/**
* Pop-up warning box, and positioning to the wrong section of the typo
* @param {} alertstr pop-up warning box content
* @param {} idstr return field focus
* @return {Boolean} returns false
*/
function Alertandrfalse (ALERTSTR, idstr) {
alert (ALERTSTR);
document.getElementById (IDSTR). focus ();
Throw "Valueerr";
}
JavaScript Document
Call Example
function Checkform () {
try {
var title = Trim (document.getElementById (' title ')); Article title
IsEmpty (title, "article title", "title");/NOT NULL
Isless (title,100, "article title", "title");//title should be less than 100 characters in length
Isfilterstr (title, "~"!@#$%^&* ()-=_+[]{}|\\; ': \ ",./<>?", "article title", "title")//title not allowed to contain these illegal characters
} catch (Err) {
if (err = = "Valueerr")
return false;
}
}
