# NumberField.js

    /**
     * @class Ext.form.NumberField
     * @extends Ext.form.TextField
     * Numeric text field that provides automatic keystroke filtering and numeric validation.
     * @constructor
     * Creates a new NumberField
     * @param {Object} config Configuration options
     */
    Ext.form.NumberField = Ext.extend(Ext.form.TextField,  {
        /**
         * @cfg {RegExp} stripCharsRe @hide
         */
    // holder
    /***
         * @cfg {RegExp} maskRe @hide
         */
    // holder
    /***
         * @cfg {String} fieldClass The default CSS class for the field (defaults to "x-form-field x-form-num-field")
         */
        fieldClass: "x-form-field x-form-num-field",
        /**
         * @cfg {Boolean} allowDecimals False to disallow decimal values (defaults to true)
         */
        allowDecimals : true,
        /**
         * @cfg {String} decimalSeparator Character(s) to allow as the decimal separator (defaults to '.')
         */
        decimalSeparator : ".",
        /**
         * @cfg {Number} decimalPrecision The maximum precision to display after the decimal separator (defaults to 2)
         */
        decimalPrecision : 2,
        /**
         * @cfg {Boolean} allowNegative False to prevent entering a negative sign (defaults to true)
         */
        allowNegative : true,
        /**
         * @cfg {Number} minValue The minimum allowed value (defaults to Number.NEGATIVE_INFINITY)
         */
        minValue : Number.NEGATIVE_INFINITY,
        /**
         * @cfg {Number} maxValue The maximum allowed value (defaults to Number.MAX_VALUE)
         */
        maxValue : Number.MAX_VALUE,
        /**
         * @cfg {String} minText Error text to display if the minimum value validation fails (defaults to "The minimum value for this field is {minValue}")
         */
        minText : "The minimum value for this field is {0}",
        /**
         * @cfg {String} maxText Error text to display if the maximum value validation fails (defaults to "The maximum value for this field is {maxValue}")
         */
        maxText : "The maximum value for this field is {0}",
        /**
         * @cfg {String} nanText Error text to display if the value is not a valid number.  For example, this can happen
         * if a valid character like '.' or '-' is left in the field with no number (defaults to "{value} is not a valid number")
         */
        nanText : "{0} is not a valid number",
        /**
         * @cfg {String} baseChars The base set of characters to evaluate as valid numbers (defaults to '0123456789').
         */
        baseChars : "0123456789",

        // private
        initEvents : function(){
            var allowed = this.baseChars + '';
            if (this.allowDecimals) {
                allowed += this.decimalSeparator;
            }
            if (this.allowNegative) {
                allowed += '-';
            }
            this.maskRe = new RegExp('[' + Ext.escapeRe(allowed) + ']');
            Ext.form.NumberField.superclass.initEvents.call(this);
        },

        // private
        validateValue : function(value){
            if(!Ext.form.NumberField.superclass.validateValue.call(this, value)){
                return false;
            }
            if(value.length < 1){ // if it's blank and textfield didn't flag it then it's valid
                 return true;
            }
            value = String(value).replace(this.decimalSeparator, ".");
            if(isNaN(value)){
                this.markInvalid(String.format(this.nanText, value));
                return false;
            }
            var num = this.parseValue(value);
            if(num < this.minValue){
                this.markInvalid(String.format(this.minText, this.minValue));
                return false;
            }
            if(num > this.maxValue){
                this.markInvalid(String.format(this.maxText, this.maxValue));
                return false;
            }
            return true;
        },

        getValue : function(){
            return this.fixPrecision(this.parseValue(Ext.form.NumberField.superclass.getValue.call(this)));
        },

        setValue : function(v){
        	v = typeof v == 'number' ? v : parseFloat(String(v).replace(this.decimalSeparator, "."));
            v = isNaN(v) ? '' : String(v).replace(".", this.decimalSeparator);
            Ext.form.NumberField.superclass.setValue.call(this, v);
        },

        // private
        parseValue : function(value){
            value = parseFloat(String(value).replace(this.decimalSeparator, "."));
            return isNaN(value) ? '' : value;
        },

        // private
        fixPrecision : function(value){
            var nan = isNaN(value);
            if(!this.allowDecimals || this.decimalPrecision == -1 || nan || !value){
               return nan ? '' : value;
            }
            return parseFloat(parseFloat(value).toFixed(this.decimalPrecision));
        },

        beforeBlur : function(){
            var v = this.parseValue(this.getRawValue());
            if(!Ext.isEmpty(v)){
                this.setValue(this.fixPrecision(v));
            }
        }
    });
    Ext.reg('numberfield', Ext.form.NumberField);

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