7 Trim() Equivalent Function In Flash Might Help Someone Else

April 7th, 2010 Ntt.cc

  

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In PHP we have a function called Trim() to remove characters from a string. However there are no the equivalent to PHP’s trim in Flash. But most time we need to trim a string with extra white space, so we can do only write this by ourselves. The following is 7 actionscript function which can do the same. They might help someone else. *If you know more please don’t hesitate to leave a comment.

1.

1. class Toolkit {
2.     public static function trim(str:String):String {
3.         var char:String;
4.         while ((char = str.charAt(0)) == chr(Key.SPACE) || char == chr(Key.TAB))
5.             str = str.substr(1);
6.         while ((char = str.charAt(str.length – 1)) == chr(Key.SPACE) || char == chr(Key.TAB))
7.             str = str.substr(0, str.length – 1);
8.         return str;
9.     }
10. }

2.

1. function trim(string) {
2. if (string.indexOf(" ") != -1) {
3. whiteIndex = string.indexOf(" ");
4. fst = string.slice(0, whiteIndex);
5. snd = string.slice(whiteIndex+1, string.length);
6. trim((fst+snd));
7. } else {
8. _root.noSpaces = string;
9. }
10. }

3.

1. function trim(str:String) :String {
2. if(str=="") return "";
3. var newStr:String;
4. var len:Number = str.length;
5. var s:Number = 0;
6. for(var i=0; i<len ; ++i) {
7. if(str.substr(i,1)==" ") s++;
8. else break;
9. }
10. newStr = str.slice(s);
11. s = 0;
12. for(var i=(len-1); i>-1; –i) {
13. if(str.substr(i,1)==" ") s–;
14. else break;
15. }
16. s = s==0? len : s;
17. newStr = newStr.slice(0,s);
18. return newStr;
19. }

4.

1. public function trim(str:String, char:String):String {
2.     return trimBack(trimFront(str, char), char);
3. }
4.  
5. public function trimFront(str:String, char:String):String {
6.     char = stringToCharacter(char);
7.     if (str.charAt(0) == char) {
8.         str = trimFront(str.substring(1), char);
9.     }
10.     return str;
11. }
12.  
13. public function trimBack(str:String, char:String):String {
14.     char = stringToCharacter(char);
15.     if (str.charAt(str.length - 1) == char) {
16.         str = trimBack(str.substring(0, str.length - 1), char);
17.     }
18.     return str;
19. }

5.

1. // parameters:
2. // matter, string to be trimmed
3. // returns:
4. // string, whitespaces removed from left side.
5. function ltrim(matter) {
6.     if ((matter.length>1) || (matter.length == 1 && matter.charCodeAt(0)>32 && matter.charCodeAt(0)<255)) {
7.         i = 0;
8.  
9.         while (i<matter.length && (matter.charCodeAt(i)<=32 || matter.charCodeAt(i)>=255)) {
10.             i++;
11.         }
12.  
13.         matter = matter.substring(i);
14.     } else {
15.         matter = "";
16.     }
17.     return matter;
18. }
19.  
20. // parameters:
21. // matter, string to be trimmed
22. // returns:
23. // string, whitespaces removed from right side.
24. function rtrim(matter) {
25.     if ((matter.length>1) || (matter.length == 1 && matter.charCodeAt(0)>32 && matter.charCodeAt(0)<255)) {
26.         i = matter.length-1;
27.  
28.        while (i>=0 && (matter.charCodeAt(i)<=32 || matter.charCodeAt(i)>=255)) {
29.             i–;
30.         }
31.         matter = matter.substring(0, i+1);
32.     } else {
33.         matter = "";
34.     }
35.  
36.     return matter;
37. }
38.  
39. // parameters:
40. // matter, string to be trimmed
41. // returns:
42. // string, whitespaces removed from both sides.
43.  
44. function trim(matter) {
45.     return ltrim(rtrim(matter));
46. }

6.

1. function LTrim(s:String):String {
2. var i=0;
3. while ((i<s.length) && (s.substr(i,1)==’ ‘)) i++;
4. return (s.substr(i,s.length-i));
5. }
6.  
7. function RTrim(s:String):String {
8. var i=s.length -1;
9.  
10. while ((i>0) && (s.substr(i,1)==’ ‘)) i–;
11.  
12. return (s.substr(0,i+1));
13. }
14.  
15. function Trim(s:String) {
16. return(LTrim(RTrim(s)));
17. }

7.

1. function trim( s:String ):String
2. {
3.   return s.replace( /^([\s|\t|\n]+)?(.*)([\s|\t|\n]+)?$/gm, "$2" );
4. }

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4 Responses to “7 Trim() Equivalent Function In Flash Might Help Someone Else”

1. Andy says:

   April 8, 2010 at 3:28 am

   What about just using StringUtil.trim()? It trims whitespace from the beginning and end of the string, and it’s build in. I just found it and used it this morning.

   Reply
2. Janes says:

   April 8, 2010 at 12:13 pm

   Package mx.utils
   Class public class StringUtil
   Inheritance StringUtil Inheritance Object

   Language Version: ActionScript 3.0
   Product Version: Flex 3
   Runtime Versions: Flash Player 9, AIR 1.1

   Reply
3. Hereisme says:

   April 8, 2010 at 6:12 pm

   how can i get a list of all child’s in a flex application ?

   Reply
4. Flash 7 Trim 方法(转载) says:

   April 21, 2010 at 3:50 pm

   [...] 原文：7 Trim 也曾为Trim纠结过。很久没浏览订阅了，今儿看到了。贴上。 1. [...]

   Reply