Can't sum variables

[londres9b]

I have this code which retrives the anchor value from the url.
(www.example.com/page#topic1 > gives 'topic1' )

var anchorValue;
var url = document.location;
var strippedUrl = url.toString().split("#");
if(strippedUrl.length > 1)
anchorvalue = strippedUrl[1];

I want to do a very simple thing, add, for example '10' to the anchorvalue variable.

So if we have www.example.com/page#20 the anchorvalue gives '20' and I want to increment that value in '10' so that I get '30'.

var anval = anchorvalue;
var sumvalue = [B]10[/B];
var newanchorvalue = anval + sumvalue;

But that gives 2010 and not 30!

How can I achieve what I want ?

Thanks in advance.

[Dormilich]

I have this code which retrives the anchor value from the url.

window.location.hash

?

But that gives 2010 and not 30!

How can I achieve what I want ?

that gives 2010 because the + operator performes both addition and string concatenation. if the first operand is a string, it will do concatenation, if it is a number, it will do addition. thus you have to cast your variable to a number, of which different ways are possible:
- use the Number constructor Number(val)
- use a mathematical operation val * 1 or val - 0
- use a conversion function parseInt()/parseFloat()

[londres9b]

window.location .hash gives #anchor and I want just anchor ...

I know why it gives 2010 but as I know very little of Javascript, I can't make anchorvalue a number.

[Dormilich]

window.location .hash gives #anchor and I want just anchor ...

I assume, you are able to remove the first character, ain’t you?

I can't make anchorvalue a number.

I told you how to do that

[londres9b]

I got it, I multiplied the var by 1, like you suggested.

Thank you very much :D

Here's the code:

var anchorValue;
var url = document.location;
var strippedUrl = url.toString().split("#");
if(strippedUrl.length > 1)
anchorvalue = strippedUrl[1];

[B]var anchorNumber = anchorvalue * 1;
 
var increment = 10;

var result = anchorNumber+increment;
[/B]

[Dormilich]

you could also have switched increment and anchorNumber, since increment is already a number.

PS.

var anchorValue = window.location.hash.substr(1);

[londres9b]

I assume, you are able to remove the first character, ain’t you?

Why? I know very little of JavaScript..

var anchorNumber = window.location.hash.substr(1);

Thanks :)

you could also have switched increment and anchorNumber, since increment is already a number.

Like this right?

var anchorNumber = anchorvalue * 1;
var result = anchorNumber+10;

[Dormilich]

Like this right?

nope. (remember what I said about the type of the first operand)

var result = 10 + anchorNumber;

[londres9b]

Ok,

Many Thanks.