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cutting var

Wed, 05 Jun 2002 08:29:32 -0700

I know nothing of Java Script. I am customizing a program that allows users to modify java script in the program. I need to know if there is a way to cut the firt character in a varible I.E. if my varible was "0987878" how can I cut the "0"? Any help would be greatly appreciated.

Roger

Re: cutting var

Thu, 06 Jun 2002 23:18:40 -0700

: I know nothing of Java Script. I am customizing a program that allows users to modify java script in the program. I need to know if there is a way to cut the firt character in a varible I.E. if my varible was "0987878" how can I cut the "0"? Any help would be greatly appreciated.
:
: Roger
:

Hi there,

Try this...

var aString = "0987878";
var newString = "";

newString = aString.substring(1, aString.length);

This will remove the first character of anything inside aString and store the result in newString.

You could go one better and do this...

var aString = "0987878";

aString = aString.substring(1, aString.length);

This will overwrite the value of aString with the original value minus the first character!

Hope this helps!
Bradley q:)

Re: cutting var

Fri, 07 Jun 2002 06:16:30 -0700

Thanks for your responce... I found out only after I had posted that message the first character only needs to be stripped when it is zero, and sometimes there are more than one "0". I eventullay came to the following code which uses the same substring function. Although I suppose I could clean it up a bit and remove some varibles.

       if (strTemp.charAt(0) == "0"){
        	var newTerm
          	while (strTemp.charAt(0) == "0") {
          		newTerm = strTemp.substring(1, strTemp.length)
          		strTemp = newTerm;
	}

~rlc

Re: cutting var

Fri, 07 Jun 2002 08:23:08 -0700

Yes:

The first two lines of code are not necessary. What you do now is: first check if the first character is a 0 and then loop checking if the first character is a zero.
Also, you don't need to store it in newTerm first. See the changes:

  //      if (strTemp.charAt(0) == "0"){    These two lines are 
  //       	var newTerm                  obsolete 
           	while (strTemp.charAt(0) == "0") {
  //  Notice the change of newTerm to strTemp  
           		strTemp = strTemp.substring(1, strTemp.length)
  //         		strTemp = newTerm; You can delete this too then 
 	}

Of course, to make it even better, you could change the name of strTemp to a more useful name like phonenumber

:
: Thanks for your responce... I found out only after I had posted that message the first character only needs to be stripped when it is zero, and sometimes there are more than one "0". I eventullay came to the following code which uses the same substring function. Although I suppose I could clean it up a bit and remove some varibles.
:
:

:        if (strTemp.charAt(0) == "0"){
:         	var newTerm
:           	while (strTemp.charAt(0) == "0") {
:           		newTerm = strTemp.substring(1, strTemp.length)
:           		strTemp = newTerm;
: 	}
:

:
: ~rlc
:
:

Re: cutting var

Sat, 08 Jun 2002 07:06:07 -0700

Thanks, i did remove the extra var already. However, I couldn't remove the "if" loop. When I just used a "While" loop the script always checks the condition after it has run through the loop once. I.E. it would delete the first character no matter what, then look to see if "0" was first. The "if" loop checks before it runs and stopped this problem for me. I didn't see a way to do this with one loop, but if there is let me know.

~rlc

: Yes:
:
: The first two lines of code are not necessary. What you do now is: first check if the first character is a 0 and then loop checking if the first character is a zero.
: Also, you don't need to store it in newTerm first. See the changes:
:
:

:   //      if (strTemp.charAt(0) == "0"){    These two lines are 
:   //       	var newTerm                  obsolete 
:            	while (strTemp.charAt(0) == "0") {
:   //  Notice the change of newTerm to strTemp  
:            		strTemp = strTemp.substring(1, strTemp.length)
:   //         		strTemp = newTerm; You can delete this too then 
:  	}
:

:
: Of course, to make it even better, you could change the name of strTemp to a more useful name like phonenumber
:
: :
: : Thanks for your responce... I found out only after I had posted that message the first character only needs to be stripped when it is zero, and sometimes there are more than one "0". I eventullay came to the following code which uses the same substring function. Although I suppose I could clean it up a bit and remove some varibles.
: :
: :

: :        if (strTemp.charAt(0) == "0"){
: :         	var newTerm
: :           	while (strTemp.charAt(0) == "0") {
: :           		newTerm = strTemp.substring(1, strTemp.length)
: :           		strTemp = newTerm;
: : 	}
: :

: :
: : ~rlc
: :
: :
:
:

Re: cutting var

Sat, 08 Jun 2002 08:10:17 -0700

This message was edited by the compuchip at 2002-6-8 8:13:1

Well, maybe it is a difference between our computers, but this code works with me

 while (strTemp.charAt(0) == "0") {
  strTemp = strTemp.substring(1, strTemp.length)
 }

You may be confused with the following use of while, which ALWAYS removes the first character, no matter what:

 do {
  strTemp = strTemp.substring(1, strTemp.length)
 } while (strTemp.charAt(0) == "0");

I thought this was the same on every computer, but I'd be glad if anyone could confirm that.

(EDIT)
Addition: you don't need the {braces}, just like in C++. So you can even write

 while (strTemp.charAt(0) == "0") 
  strTemp = strTemp.substring(1, strTemp.length);

because the while-loop consists only of one statement.

: Thanks, i did remove the extra var already. However, I couldn't remove the "if" loop. When I just used a "While" loop the script always checks the condition after it has run through the loop once. I.E. it would delete the first character no matter what, then look to see if "0" was first. The "if" loop checks before it runs and stopped this problem for me. I didn't see a way to do this with one loop, but if there is let me know.
:
:
: ~rlc
:
:
:
: : Yes:
: :
: : The first two lines of code are not necessary. What you do now is: first check if the first character is a 0 and then loop checking if the first character is a zero.
: : Also, you don't need to store it in newTerm first. See the changes:
: :
: :

: :   //      if (strTemp.charAt(0) == "0"){    These two lines are 
: :   //       	var newTerm                  obsolete 
: :            	while (strTemp.charAt(0) == "0") {
: :   //  Notice the change of newTerm to strTemp  
: :            		strTemp = strTemp.substring(1, strTemp.length)
: :   //         		strTemp = newTerm; You can delete this too then 
: :  	}
: :

: :
: : Of course, to make it even better, you could change the name of strTemp to a more useful name like phonenumber
: :
: : :
: : : Thanks for your responce... I found out only after I had posted that message the first character only needs to be stripped when it is zero, and sometimes there are more than one "0". I eventullay came to the following code which uses the same substring function. Although I suppose I could clean it up a bit and remove some varibles.
: : :
: : :

: : :        if (strTemp.charAt(0) == "0"){
: : :         	var newTerm
: : :           	while (strTemp.charAt(0) == "0") {
: : :           		newTerm = strTemp.substring(1, strTemp.length)
: : :           		strTemp = newTerm;
: : : 	}
: : :

: : :
: : : ~rlc
: : :
: : :
: :
: :
:
:

Re: cutting var

Tue, 11 Jun 2002 17:42:15 -0700

Hi all,

Yep I've just confirmed that in IE6 on WinXP the code that compuchip suggested worked for me...

I just wrote a quick simple page to show it in action for you...


<html>
<head>
<script language="JavaScript">

function doIt() {
	var strTemp = document.a.strTemp.value;
	while (strTemp.charAt(0) == "0") {
		strTemp = strTemp.substring(1, strTemp.length)
	}
	document.a.strTemp.value = strTemp;
}

</script>
</head>
<body>
<form name="a">
<input type="text" name="strTemp" onChange="doIt();">
</form>
</body>
</html>

Cya
Bradley q:)

: This message was edited by the compuchip at 2002-6-8 8:13:1

: Well, maybe it is a difference between our computers, but this code works with me
:

:  while (strTemp.charAt(0) == "0") {
:   strTemp = strTemp.substring(1, strTemp.length)
:  }
:

:
: You may be confused with the following use of while, which ALWAYS removes the first character, no matter what:
:

:  do {
:   strTemp = strTemp.substring(1, strTemp.length)
:  } while (strTemp.charAt(0) == "0");
:

:
: I thought this was the same on every computer, but I'd be glad if anyone could confirm that.
:
: (EDIT)
: Addition: you don't need the {braces}, just like in C++. So you can even write
:

:  while (strTemp.charAt(0) == "0") 
:   strTemp = strTemp.substring(1, strTemp.length);
:

: because the while-loop consists only of one statement.
:
: : Thanks, i did remove the extra var already. However, I couldn't remove the "if" loop. When I just used a "While" loop the script always checks the condition after it has run through the loop once. I.E. it would delete the first character no matter what, then look to see if "0" was first. The "if" loop checks before it runs and stopped this problem for me. I didn't see a way to do this with one loop, but if there is let me know.
: :
: :
: : ~rlc
: :
: :
: :
: : : Yes:
: : :
: : : The first two lines of code are not necessary. What you do now is: first check if the first character is a 0 and then loop checking if the first character is a zero.
: : : Also, you don't need to store it in newTerm first. See the changes:
: : :
: : :

: : :   //      if (strTemp.charAt(0) == "0"){    These two lines are 
: : :   //       	var newTerm                  obsolete 
: : :            	while (strTemp.charAt(0) == "0") {
: : :   //  Notice the change of newTerm to strTemp  
: : :            		strTemp = strTemp.substring(1, strTemp.length)
: : :   //         		strTemp = newTerm; You can delete this too then 
: : :  	}
: : :

: : :
: : : Of course, to make it even better, you could change the name of strTemp to a more useful name like phonenumber
: : :
: : : :
: : : : Thanks for your responce... I found out only after I had posted that message the first character only needs to be stripped when it is zero, and sometimes there are more than one "0". I eventullay came to the following code which uses the same substring function. Although I suppose I could clean it up a bit and remove some varibles.
: : : :
: : : :

: : : :        if (strTemp.charAt(0) == "0"){
: : : :         	var newTerm
: : : :           	while (strTemp.charAt(0) == "0") {
: : : :           		newTerm = strTemp.substring(1, strTemp.length)
: : : :           		strTemp = newTerm;
: : : : 	}
: : : :

: : : :
: : : : ~rlc
: : : :
: : : :
: : :
: : :
: :
: :
:
:
:
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