Allow only numbers in an input field

Question

I want to know how to restrict the input field numbers and just ignore the letters, I found it but the method of "int" does not exist, or rather "int" does not exist. I Program in C #

 GUI.Label(new Rect(positionX, positionY, _W, _H), "Epaisseur (mm):");
                 stringToEditH = GUI.TextField (new Rect (positionX, positionY+_H, _W/3f, 20f), num.ToString(), 3);
                 
                 int temp = 0;
                 if (int.TryParse(stringToEditH, temp))
                 {
                     num = Mathf.Clamp(0, temp);
                 }
                 else if (text == "") num = 0;

Answer 1

Best Answer

Answer by jahroy · Dec 08, 2011 at 12:20 AM

It's very easy if you want to use a regex:

I don't usually use C#, but a quick look at the documentation makes me think it would look like this:

/* define a pattern: everything but 0-9 */

Regex rgx = new Regex("[^0-9]");

/ replace all non-numeric characters with an empty string /

stringToEditH = rgx.Replace(stringToEditH, "");

You might have to fiddle with it, but that's the idea....

------------

If you don't want to use a regex, you could do it yourself like this:

function stripNonNumerics ( inputString : String ) : String { var theResult : String = "";

 for ( var i = 0; i &lt; inputString.length; i ++ ) {

     var theString : String = inputString.Substring(i, 1);
     var tempInt   : int;

     if ( int.TryParse(theString, tempInt) ) {
         theResult += theString;
     }
 }

 return theResult;

}

There are probably a few better ways to do it, but that seems to work for me.

That's in UnityScript... it will probably be easier in C# where you can use chars!!

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Kalu · Dec 08, 2011 at 12:24 AM 0

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The type or namespace name `Regex' could not be found. :s

Kalu · Dec 08, 2011 at 12:31 AM 0

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using System.Text.RegularExpressions;

Perfect! Thx.

jahroy · Dec 08, 2011 at 12:32 AM 0

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You have to add the Regex library if you want to use its functions.

I believe you need to add the following to the top of your script:

 using System.Text.RegularExpressions;

... or something like that.

That's why I said if you want to use a regex.

If you don't want to include that library (but get the same result) you can use the second example I gave.

Allow only numbers in an input field

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