String remove last ; semicolon

[DH]

I am not to familar with JavaScript and would like to:

1.) test if a string ends with a semicolon ;
2.) if string ends in semicolon ; then remove the semicolon ;

Original String:
email1@domain.com; email2@domain.com;

I would like to end up with the following string:
email1@domain.com; email2@domain.com

Does anyone have an example or source code they could post.

Thank you!

DH

 

[tsuji]

Just for a bit of fun with regexp.
[tt]
var s="email1@domain.com; email2@domain.com;"
var b=/;$/.test(s); //return true if end with ; false if not.
var t=s.replace(/;$/,""); //by itself always elim ; at the end if any
[/tt]
You sure can do as well with string functions like substring(), indexOf() etc.

 

[DH]

tsuji thanks for the help!

Can I ask you one more question...

I create a variable for the value of a textbox like so:

var emailString = document.Form1.txtEmail.value;

I would like to test the variable to see if the variable ends with a semicolon and if not concatenate a semicolon to the variable

I can accomplish this in asp.net/vb.net but I don't use JavaScript much and am getting stuck.

Once this is solved I can add the ; to the string when needed and remove it when needed.

Thanks again!

DH

 

[theniteowl]

Here you go. I set this up as a function so you can pass a value to it to have it tested and have that value returned. If there is a semicolon on the end it gets removed from the returned string and if not it returns the original string.

function checkstr(mystr){
var outstr = ((mystr.charAt(mystr.length-1,1) == ";") ? mystr.substring(0,mystr.length-1) : mystr);
return outstr;
}

alert(checkstr("ABCDEFGH;"));

This is a short way to do it but is not the clearest to understand. It uses a conditional operator to do the compare. The variable outstr will get the output.
First it uses mystr.charAt(mystr.length-1,1) which checks a single character starting at the last character in the string and tests if it is == ";". If this test is true then the operand after the ? is used, if it is false the operand after the : is used.
The second operand grabs the string starting at position 0 up to the end of the string minus 1 character.


Paranoid? ME?? WHO WANTS TO KNOW????

 

[theniteowl]

Damn, tsuji beat me. tsuji, go to bed it's late.

On second thought, never mind, "I" will go to bed instead.

Paranoid? ME?? WHO WANTS TO KNOW????

 

[tsuji]

Maybe something like this. [1] To add...
[tt]
if (!/;$/.test(emailString)) {emailString+=";"}
[/tt]
[2] To elim...
[tt]
if (/;$/.test(emailString)) {
emailString=emailString.replace(/;$/,"")
}[/tt]

 

[tsuji]

theniteowl, me go to bed already? I think I get up late! Take care.