# TextField.js

    /**
     * @class Ext.form.TextField
     * @extends Ext.form.Field
     * Basic text field.  Can be used as a direct replacement for traditional text inputs, or as the base
     * class for more sophisticated input controls (like {@link Ext.form.TextArea} and {@link Ext.form.ComboBox}).
     * @constructor
     * Creates a new TextField
     * @param {Object} config Configuration options
     */
    Ext.form.TextField = function(config){
        Ext.form.TextField.superclass.constructor.call(this, config);
        this.addEvents({
            /**
             * @event autosize
             * Fires when the autosize function is triggered.  The field may or may not have actually changed size
             * according to the default logic, but this event provides a hook for the developer to apply additional
             * logic at runtime to resize the field if needed.
    	     * @param {Ext.form.Field} this This text field
    	     * @param {Number} width The new field width
    	     */
            autosize : true
        });
    };

    Ext.extend(Ext.form.TextField, Ext.form.Field,  {
        /**
         * @cfg {Boolean} grow True if this field should automatically grow and shrink to its content
         */
        grow : false,
        /**
         * @cfg {Number} growMin The minimum width to allow when grow = true (defaults to 30)
         */
        growMin : 30,
        /**
         * @cfg {Number} growMax The maximum width to allow when grow = true (defaults to 800)
         */
        growMax : 800,
        /**
         * @cfg {String} vtype A validation type name as defined in {@link Ext.form.VTypes} (defaults to null)
         */
        vtype : null,
        /**
         * @cfg {String} maskRe An input mask regular expression that will be used to filter keystrokes that don't match (defaults to null)
         */
        maskRe : null,
        /**
         * @cfg {Boolean} disableKeyFilter True to disable input keystroke filtering (defaults to false)
         */
        disableKeyFilter : false,
        /**
         * @cfg {Boolean} allowBlank False to validate that the value length > 0 (defaults to true)
         */
        allowBlank : true,
        /**
         * @cfg {Number} minLength Minimum input field length required (defaults to 0)
         */
        minLength : 0,
        /**
         * @cfg {Number} maxLength Maximum input field length allowed (defaults to Number.MAX_VALUE)
         */
        maxLength : Number.MAX_VALUE,
        /**
         * @cfg {String} minLengthText Error text to display if the minimum length validation fails (defaults to "The minimum length for this field is {minLength}")
         */
        minLengthText : "The minimum length for this field is {0}",
        /**
         * @cfg {String} maxLengthText Error text to display if the maximum length validation fails (defaults to "The maximum length for this field is {maxLength}")
         */
        maxLengthText : "The maximum length for this field is {0}",
        /**
         * @cfg {Boolean} selectOnFocus True to automatically select any existing field text when the field receives input focus (defaults to false)
         */
        selectOnFocus : false,
        /**
         * @cfg {String} blankText Error text to display if the allow blank validation fails (defaults to "This field is required")
         */
        blankText : "This field is required",
        /**
         * @cfg {Function} validator A custom validation function to be called during field validation (defaults to null).
         * If available, this function will be called only after the basic validators all return true, and will be passed the
         * current field value and expected to return boolean true if the value is valid or a string error message if invalid.
         */
        validator : null,
        /**
         * @cfg {RegExp} regex A JavaScript RegExp object to be tested against the field value during validation (defaults to null).
         * If available, this regex will be evaluated only after the basic validators all return true, and will be passed the
         * current field value.  If the test fails, the field will be marked invalid using {@link #regexText}.
         */
        regex : null,
        /**
         * @cfg {String} regexText The error text to display if {@link #regex} is used and the test fails during validation (defaults to "")
         */
        regexText : "",
        /**
         * @cfg {String} emptyText The default text to display in an empty field (defaults to null).
         */
        emptyText : null,
        /**
         * @cfg {String} emptyClass The CSS class to apply to an empty field to style the {@link #emptyText} (defaults to
         * 'x-form-empty-field').  This class is automatically added and removed as needed depending on the current field value.
         */
        emptyClass : 'x-form-empty-field',

        // private
        initEvents : function(){
            Ext.form.TextField.superclass.initEvents.call(this);
            if(this.validationEvent == 'keyup'){
                this.validationTask = new Ext.util.DelayedTask(this.validate, this);
                this.el.on('keyup', this.filterValidation, this);
            }
            else if(this.validationEvent !== false){
                this.el.on(this.validationEvent, this.validate, this, {buffer: this.validationDelay});
            }
            if(this.selectOnFocus || this.emptyText){
                this.on("focus", this.preFocus, this);
                if(this.emptyText){
                    this.on('blur', this.postBlur, this);
                    this.applyEmptyText();
                }
            }
            if(this.maskRe || (this.vtype && this.disableKeyFilter !== true && (this.maskRe = Ext.form.VTypes[this.vtype+'Mask']))){
                this.el.on("keypress", this.filterKeys, this);
            }
            if(this.grow){
                this.el.on("keyup", this.onKeyUp,  this, {buffer:50});
                this.el.on("click", this.autoSize,  this);
            }
        },

        filterValidation : function(e){
            if(!e.isNavKeyPress()){
                this.validationTask.delay(this.validationDelay);
            }
        },

        // private
        onKeyUp : function(e){
            if(!e.isNavKeyPress()){
                this.autoSize();
            }
        },

        /**
         * Resets the current field value to the originally-loaded value and clears any validation messages.
         * Also adds emptyText and emptyClass if the original value was blank.
         */
        reset : function(){
            Ext.form.TextField.superclass.reset.call(this);
            this.applyEmptyText();
        },

        applyEmptyText : function(){
            if(this.rendered && this.emptyText && this.getRawValue().length < 1){
                this.setRawValue(this.emptyText);
                this.el.addClass(this.emptyClass);
            }
        },

        // private
        preFocus : function(){
            if(this.emptyText){
                if(this.getRawValue() == this.emptyText){
                    this.setRawValue('');
                }
                this.el.removeClass(this.emptyClass);
            }
            if(this.selectOnFocus){
                this.el.dom.select();
            }
        },

        // private
        postBlur : function(){
            this.applyEmptyText();
        },

        // private
        filterKeys : function(e){
            var k = e.getKey();
            if(!Ext.isIE && (e.isNavKeyPress() || k == e.BACKSPACE || (k == e.DELETE && e.button == -1))){
                return;
            }
            var c = e.getCharCode();
            if(!this.maskRe.test(String.fromCharCode(c) || '')){
                e.stopEvent();
            }
        },

        setValue : function(v){
            if(this.emptyText && v !== undefined && v !== null && v !== ''){
                this.el.removeClass(this.emptyClass);
            }
            Ext.form.TextField.superclass.setValue.apply(this, arguments);
        },

        /**
         * Validates a value according to the field's validation rules and marks the field as invalid
         * if the validation fails
         * @param {Mixed} value The value to validate
         * @return {Boolean} True if the value is valid, else false
         */
        validateValue : function(value){
            if(value.length < 1 || value === this.emptyText){ // if it's blank
                 if(this.allowBlank){
                     this.clearInvalid();
                     return true;
                 }else{
                     this.markInvalid(this.blankText);
                     return false;
                 }
            }
            if(value.length < this.minLength){
                this.markInvalid(String.format(this.minLengthText, this.minLength));
                return false;
            }
            if(value.length > this.maxLength){
                this.markInvalid(String.format(this.maxLengthText, this.maxLength));
                return false;
            }
            if(this.vtype){
                var vt = Ext.form.VTypes;
                if(!vt[this.vtype](value)){
                    this.markInvalid(this.vtypeText || vt[this.vtype +'Text']);
                    return false;
                }
            }
            if(typeof this.validator == "function"){
                var msg = this.validator(value);
                if(msg !== true){
                    this.markInvalid(msg);
                    return false;
                }
            }
            if(this.regex && !this.regex.test(value)){
                this.markInvalid(this.regexText);
                return false;
            }
            return true;
        },

        /**
         * Selects text in this field
         * @param {Number} start (optional) The index where the selection should start (defaults to 0)
         * @param {Number} end (optional) The index where the selection should end (defaults to the text length)
         */
        selectText : function(start, end){
            var v = this.getRawValue();
            if(v.length > 0){
                start = start === undefined ? 0 : start;
                end = end === undefined ? v.length : end;
                var d = this.el.dom;
                if(d.setSelectionRange){
                    d.setSelectionRange(start, end);
                }else if(d.createTextRange){
                    var range = d.createTextRange();
                    range.moveStart("character", start);
                    range.moveEnd("character", v.length-end);
                    range.select();
                }
            }
        },

        /**
         * Automatically grows the field to accomodate the width of the text up to the maximum field width allowed.
         * This only takes effect if grow = true and fires the autosize event.
         */
        autoSize : function(){
            if(!this.grow || !this.rendered){
                return;
            }
            if(!this.metrics){
                this.metrics = Ext.util.TextMetrics.createInstance(this.el);
            }
            var el = this.el;
            var v = el.dom.value + "&#160;";
            var w = Math.min(this.growMax, Math.max(this.metrics.getWidth(v) + /* add extra padding */ 10, this.growMin));
            this.el.setWidth(w);
            this.fireEvent("autosize", this, w);
        }
    });

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