Javascript string string manipulation package _javascript Tips

Core code:

Copy Code code as follows:

/**
* Jscript.string Package
* This package contains utility functions for working with strings.
*/
if (typeof JScript = = ' undefined ') {
JScript = function () {}
}
jscript.string = function () {}
/**
* This function searches a string for another string and returns a count
* How-many times the second string appears in the
* (returns the number of occurrences of a substring in a string)
* @param inStr the string to be searched.
* @param insearchstr The string to search for.
* @return the number of times Insearchstr appears in InStr,
* or 0 if INSTR or insearchstr is null or a blank string.
*/
Jscript.string.substrCount = function (InStr, insearchstr) {
if (inStr = null | | inStr = = "" | |
INSEARCHSTR = = NULL | | Insearchstr = = "") {
return 0;
}
var splitchars = Instr.split (INSEARCHSTR);
return splitchars.length-1;
}//End Substrcount ().
/**
* This function would take take an input string and either the strip any
* character that appears in a given list of characters, or'll strip any
* Character that does isn't appear in a given list of characters.
* (This function is used to mask or preserve characters in "incharlist", depending on the parameter "Instriporallow")
* @param inStr the string to strip characters.
* @param instriporallow either the value "strip" or "allow".
* @param incharlist This is either (a) the list of characters
* 'll be stripped from inStr (when instriporallow = =
* "Strip"), or (b) the list of characters that would
* Not being stripped from inStr (when instriporallow = =
"Allow".
* @return The value of inStr after characters have been
* Stripped as specified.
*/
Jscript.string.stripChars = function (InStr, Instriporallow, incharlist) {
if (inStr = null | | inStr = = "" | |
Incharlist = = NULL | | incharlist = "" | |
Instriporallow = = NULL | | Instriporallow = = "") {
Return "";
}
Instriporallow = Instriporallow.tolowercase ();
var outstr = "";
var i;
var J;
var Nextchar;
var Keepchar;
for (i = 0; i < instr.length; i++) {
Nextchar = Instr.substr (i, 1);
if (Instriporallow = = "Allow") {
Keepchar = false;
} else {
Keepchar = true;
}
for (j = 0; J < Incharlist.length; J + +) {
Checkchar = Incharlist.substr (j, 1);
if (Instriporallow = = "Allow" && nextchar = = Checkchar) {
Keepchar = true;
}
if (Instriporallow = "Strip" && Nextchar = = Checkchar) {
Keepchar = false;
}
}
if (Keepchar = = True) {
outstr = outstr + Nextchar;
}
}
return outstr;
}//End Stripchars ().
/**
* This function can check are a given string either only contains characters
* From a list, or does to contain any characters from a given list.
* (This function is used to determine whether Instring is a character in incharlist, or to make the opposite judgment, depending on the parameter infromexcept)
* @param instring the string to validate.
* @param incharlist A List of characters this is either (a)
* characters allowed in instring (when infromexcept
* is = = = "From_list") or (b) the only characters that
* cannot appear in instring while Infromexcept is
* = = = "Not_from_list").
* @param infromexcept is "from_list", then instring
* contain characters from incharlist. When it is
* "Not_from_list", then instring can contain any character
* except thos in incharlist.
* @return True If instring only contains valid characters,
* As listed in incharlist when infromexcept = =
* "From_list", false if not, or true if Instring does
* Not containt any of the characters listed in
* Incharlist when infromexcept = = "Not_from_list".
*/
Jscript.string.strContentValid = function (instring, incharlist, infromexcept) {
if (instring = null | | incharlist = NULL | | | infromexcept = NULL | |
instring = "" | | Incharlist = = "") {
return false;
}
Infromexcept = Infromexcept.tolowercase ();
var i;
if (infromexcept = = "From_list") {
for (i = 0; i < instring.length; i++) {
if (Incharlist.indexof (Instring.charat (i)) = = 1) {
return false;
}
}
return true;
}
if (infromexcept = = "Not_from_list") {
for (i = 0; i < instring.length; i++) {
if (Incharlist.indexof (Instring.charat (i))!=-1) {
return false;
}
}
return true;
}
}//End Strcontentvalid ().
/**
* This function replaces a given substring of a string (all occurances of
* It to is more precise) with a specified new substring. The substrings
* Can of course is single characters.
* (This function replaces the function of the string and replaces all inold in insrc with Innew)
* @param insrc The string to replace substring (s) in.
* @param inold the substring to replace.
* @param innew The new substring to insert.
* @return The value of INSRC with all occurances of Inold replaced
* with Innew.
*/
Jscript.string.replace = function (Insrc, Inold, innew) {
if (insrc = null | | insrc = = "" | | Inold = = NULL | | Inold = "" | |
Innew = = NULL | | Innew = = "") {
Return "";
}
while (Insrc.indexof (Inold) >-1) {
INSRC = Insrc.replace (Inold, innew);
}
return INSRC;
}//End replace ().
/**
* Function to trim whitespace from the beginning of a string.
* (remove white space characters from the left of the string)
* @param inStr the string to trim.
* @return The trimmed string, or null if NULL or a blank string was
* Passed in.
*/
Jscript.string.leftTrim = function (inStr) {
if (inStr = null | | inStr = = "") {
return null;
}
var J;
for (j = 0; Instr.charat (j) = = ""; J + +) {}
Return Instr.substring (J, Instr.length);
}//End Lefttrim ().
/**
* Function to trim whitespace from the end of a string.
* (in relation to the above function, remove whitespace characters from the right side of the string)
* @param inStr the string to trim.
* @return The trimmed string, or null if NULL or a blank string was
* Passed in.
*/
Jscript.string.rightTrim = function (inStr) {
if (inStr = null | | inStr = = "") {
return null;
}
var J;
for (j = instr.length-1; Instr.charat (j) = ""; j--) {}
Return instr.substring (0, J + 1);
}//End Righttrim ().
/**
* Function to trim whitespace from both ends of a string.
*
* @param inStr the string to trim.
* @return The trimmed string, or null if NULL or a blank string was
* Passed in.
*/
Jscript.string.fullTrim = function (inStr) {
if (inStr = null | | inStr = = "") {
Return "";
}
INSTR = This.lefttrim (INSTR);
INSTR = This.righttrim (INSTR);
return inStr;
}//End Fulltrim ().

Demo Area

<script> if (typeof jscript = = ' undefined ') {JScript = function () {}} jscript.string = function () {} JSCR Ipt.string.substrCount = function (InStr, insearchstr) {if (inStr = = NULL | | inStr = "" | | INSEARCHSTR = = NULL | | Insearchstr = = "") {return 0; var splitchars = Instr.split (INSEARCHSTR); return splitchars.length-1; }//End Substrcount (). Jscript.string.stripChars = function (InStr, Instriporallow, incharlist) {if (inStr = null | | inStr = "" | | Incharlist = = NULL | | incharlist = "" | | Instriporallow = = NULL | | Instriporallow = = "") {return ""; } Instriporallow = Instriporallow.tolowercase (); var outstr = ""; var i; var J; var Nextchar; var Keepchar; for (i = 0; i < instr.length i++) {Nextchar = Instr.substr (i, 1); if (Instriporallow = = "Allow") {Keepchar = false; else {Keepchar = true; for (j = 0; J < Incharlist.length J + +) {Checkchar = Incharlist.substr (j, 1); if (Instriporallow = = "Allow" && Nextchar == Checkchar) {Keepchar = true; } if (Instriporallow = "Strip" && Nextchar = = Checkchar) {Keepchar = false; } if (Keepchar = = true) {outstr = outstr + Nextchar; } return outstr; }//End Stripchars (). Jscript.string.strContentValid = function (instring, incharlist, infromexcept) {if (instring = null | | incharlist = NUL L | | Infromexcept = = NULL | | instring = "" | | Incharlist = = "") {return false; } infromexcept = Infromexcept.tolowercase (); var i; if (infromexcept = = "From_list") {for (i = 0; i < instring.length; i++) {if (Incharlist.indexof (i)) = =-1) {return false; } return true; } if (infromexcept = = "Not_from_list") {for (i = 0; i < instring.length; i++) {if Incharlist.indexof (Instring.cha RAt (i))!=-1 {return false; } return true; }//End Strcontentvalid (). Jscript.string.replace = function (Insrc, Inold, innew) {if (insrc = null | | insrc = "" | | Inold = = NULL | | Inold = "" | | Innew = = null | | Innew = = "") {return ""; while (Insrc.indexof (Inold) >-1) {insrc = Insrc.replace (Inold, innew); return INSRC; }//End replace (). Jscript.string.leftTrim = function (inStr) {if (inStr = null | | | inStr = = "") {return null; } var J; for (j = 0; Instr.charat (j) = = ""; J + +) {} return instr.substring (J, Instr.length); }//End Lefttrim (). Jscript.string.rightTrim = function (inStr) {if (inStr = null | | | inStr = = "") {return null; } var J; for (j = instr.length-1; Instr.charat (j) = ""; j--) {} return instr.substring (0, J + 1); }//End Righttrim (). Jscript.string.fullTrim = function (inStr) {if (inStr = null | | | inStr = = "") {return ""; } inStr = This.lefttrim (INSTR); INSTR = This.righttrim (INSTR); return inStr; }//End Fulltrim (). </script> <div id= "Jscript_string_div" >substrcount ()-count How many times the string "Wo" appears in the Str ing "how much wood would a woodchuck chuck if a woodchuck could chuck Wood" (5) <br><br>stripchars ()-strip the characters ' Aeio ' from the string "Denny Crane are cool!", then Strip all Char Acters EXCEPT ' Denycran ' <br><br>strcontentvalid ()-validate the string "12345" only contains numbers (t Rue), and then that's the string "abc123" does not contain the character B (false) <br><br>replace ()-replace " Wood "with" Metal ' in the string ' How much wood would a woodchuck chuck if a woodchuck could chuck Wood ' <br><b R>lefttrim ()-trim leading spaces from the string "  test" ('ll display length before (6) and after (4) &LT;BR&G T;<br>righttrim ()-trim trailing spaces from the string "test " (would display length before (6) and after (4)) <br><br>fulltrim ()-trim both leading and trailing spaces from the string "  test " ('ll display Length before (8) and after (4)) <br><br>breakline ()-break up the string "All work and no play makes Homer g o Crazy "into charactER chunks <br><br></div> <div id= "C_jquery_test" ></div>
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