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copied!<pre><code>package Utility { import flash.events.Event; import flashx.textLayout.operations.PasteOperation; import spark.components.TextInput; import spark.events.TextOperationEvent; /** * This is a text input component that can only input numbers. * A number means a real number. * @author Cheng Liang * @version 0.0.1 */ public class NumberInput extends TextInput { [Bindable("numberChange")] /** * Sets number as input value. */ public function set number(value : Number) : void { var s : String = value.toString(); if(text != s) { text = s; dispatchEvent(new Event("numberChange")); } } public function get number() : Number { return Number(text); } public function NumberInput() { super(); this.addEventListener(TextOperationEvent.CHANGE, onTextChange); } protected function onTextChange(event : TextOperationEvent) : void { if (event.operation is PasteOperation) { TextInput(event.currentTarget).text=''; } if(text == "" || text.length == 1) { return; } /* To allow single (.) */ var idx : int = text.indexOf(".", 0); if(idx >= 0) { text = text.substring(0, idx + 1) + text.substring(idx + 1).replace(".", ""); } /* To allow single (-) only at the 1st position*/ if(text.lastIndexOf("-")==0) text ='-'+ text.substring(1); else if(text.lastIndexOf("-")>0) { if(text.charAt(0)=='-') text ='-'+ text.substring(1).replace("-", ""); else text =text.replace("-", ""); } var arr:Array = TextInput(event.currentTarget).text.split("."); try{ if(arr[1] && String(arr[1]).length > 2){ TextInput(event.currentTarget).text = arr[0]+"."+String(arr[1]).slice(0,2); } }catch(err:Error){} this.selectRange((text.length), (text.length)); } } } </code></pre>

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