textfield.js

Ext JS是一个创建丰富互联网应用程序的跨浏览器的JavaScrip库。它包含：高效率

                    }, this, {single:true});
                }
            }, 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.mon(this.el, 'keypress', this.filterKeys, this);
        }
        if(this.grow){
        	this.mon(this.el, 'keyup', this.onKeyUpBuffered, this, {buffer: 50});
			this.mon(this.el, 'click', this.autoSize, this);
        }
        if(this.enableKeyEvents){
        	this.mon(this.el, 'keyup', this.onKeyUp, this);
        	this.mon(this.el, 'keydown', this.onKeyDown, this);
        	this.mon(this.el, 'keypress', this.onKeyPress, this);
        }
    },

    processValue : function(value){
        if(this.stripCharsRe){
            var newValue = value.replace(this.stripCharsRe, '');
            if(newValue !== value){
                this.setRawValue(newValue);
                return newValue;
            }
        }
        return value;
    },

    filterValidation : function(e){
        if(!e.isNavKeyPress()){
            this.validationTask.delay(this.validationDelay);
        }
    },
    
    //private
    onDisable: function(){
        Ext.form.TextField.superclass.onDisable.call(this);
        if(Ext.isIE){
            this.el.dom.unselectable = 'on';
        }
    },
    
    //private
    onEnable: function(){
        Ext.form.TextField.superclass.onEnable.call(this);
        if(Ext.isIE){
            this.el.dom.unselectable = '';
        }
    },

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

    // private
    onKeyUp : function(e){
        this.fireEvent('keyup', this, e);
    },

    // private
    onKeyDown : function(e){
        this.fireEvent('keydown', this, e);
    },

    // private
    onKeyPress : function(e){
        this.fireEvent('keypress', this, e);
    },

    /**
     * Resets the current field value to the originally-loaded value and clears any validation messages.
     * Also adds <tt><b>{@link #emptyText}</b></tt> and <tt><b>{@link #emptyClass}</b></tt> 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.hasFocus){
            this.setRawValue(this.emptyText);
            this.el.addClass(this.emptyClass);
        }
    },

    // private
    preFocus : function(){
        if(this.emptyText){
            if(this.el.dom.value == 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){
        if(e.ctrlKey){
            return;
        }
        var k = e.getKey();
        if(Ext.isGecko && (e.isNavKeyPress() || k == e.BACKSPACE || (k == e.DELETE && e.button == -1))){
            return;
        }
        var c = e.getCharCode(), cc = String.fromCharCode(c);
        if(!Ext.isGecko && e.isSpecialKey() && !cc){
            return;
        }
        if(!this.maskRe.test(cc)){
            e.stopEvent();
        }
    },

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

    /**
     * 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(Ext.isFunction(this.validator)){
            var msg = this.validator(value);
            if(msg !== true){
                this.markInvalid(msg);
                return false;
            }
        }
        if(this.vtype){
            var vt = Ext.form.VTypes;
            if(!vt[this.vtype](value, this)){
                this.markInvalid(this.vtypeText || vt[this.vtype +'Text']);
                return false;
            }
        }
        if(this.regex && !this.regex.test(value)){
            this.markInvalid(this.regexText);
            return false;
        }
        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;
        }
        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();
        var doFocus = false;
        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", end-v.length);
                range.select();
            }
            doFocus = Ext.isGecko || Ext.isOpera;
        }else{
            doFocus = true;
        }
        if(doFocus){
            this.focus();
        }
    },

    /**
     * Automatically grows the field to accomodate the width of the text up to the maximum field width allowed.
     * This only takes effect if <tt><b>{@link #grow}</b> = true</tt>, and fires the {@link #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;
        var d = document.createElement('div');
        d.appendChild(document.createTextNode(v));
        v = d.innerHTML;
        d = null;
        Ext.removeNode(d);
        v += "&#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);
    },
	
	onDestroy: function(){
		if(this.validationTask){
			this.validationTask.cancel();
			this.validationTask = null;
		}
		Ext.form.TextField.superclass.onDestroy.call(this);
	}
});
Ext.reg('textfield', Ext.form.TextField);