Is there anything like IsNumeric?

AntonMuerte

I'm just wondering if there's anything like the function IsNumeric in Visual Basic?  I just want to check that what is entered in a text entry box is actually a number and not letters.

TheMadExile

No, but you could do something like this:


window.isNumeric = function (obj) {
switch (typeof obj) {
case "boolean":
/* FALL-THROUGH */
case "object":
return false;
case "string":
obj = Number(obj);
break;
}
return isFinite(obj) && !isNaN(obj);
};


The code will handle any type passed to it.  Returns true for actual numbers and numeric strings, that aren't also NaN or Infinity, and false for anything else.

AntonMuerte

Would I create a script, and then call that with something like

<<if $buyhp.isNumeric = true>>

or have I got it wrong?

I've just tried it and when I put it in Twine (using SugarCube) using a <<textbox $buyhp "">> it's constantly referring false.  If I'm cpmpletely wrong I'm still trying to work out how Javascript works in Twine

TheMadExile

You'd put that in a script-tagged passage, yes.  Usage would be:


<<if isNumeric($buyhp)>>


However, that function is already in SugarCube's Util library, so you could simply use that one if you wanted.  Usage would be:


<<if Util.isNumeric($buyhp)>>


Additionally:

AntonMuerte wrote:

using a <<textbox $buyhp "">>

Unless you're doing something like symbolic reference (I doubt you are), then in SugarCube, per the docs, you must quote the name of the data $variable that you're passing into <<textbox>> (or <<checkbox>> or <<radiobutton>>).  For example:


// OK
<<textbox "$buyhp" "">>

// WRONG
<<textbox $buyhp "">>


If you don't quote the $variable, then the macro processor will dereference it and pass its value to <<textbox>>, which isn't what you want.

AntonMuerte

Works perfect.  I suppose for simplicities sake I'll use the one built into SugarCube.  Sorry for not mentioning I was using SugarCube before  :-[

I did have $buyhp in the quotes, that was just a typo because I didn't cut and paste.