checkbox.js

dojo-0.3.0-ajax开 源 项 目

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.require("dojo.widget.Checkbox");
dojo.provide("dojo.widget.html.Checkbox");

// FIXME: the input doesn't get taken out of the tab list (i think)
// FIXME: the image doesn't get into the tab list (needs to steal the tabindex value from the input)

dojo.widget.html.Checkbox = function(){
	dojo.widget.HtmlWidget.call(this);
}

dojo.inherits(dojo.widget.html.Checkbox, dojo.widget.HtmlWidget);

dojo.lang.extend(dojo.widget.html.Checkbox, {
	widgetType: "Checkbox",

	_testImg: null,

	_events: [
		"onclick",
		"onfocus",
		"onblur",
		"onselect",
		"onchange",
		"onclick",
		"ondblclick",
		"onmousedown",
		"onmouseup",
		"onmouseover",
		"onmousemove",
		"onmouseout",
		"onkeypress",
		"onkeydown",
		"onkeyup"
	],

	srcOn: dojo.uri.dojoUri('src/widget/templates/check_on.gif'),
	srcOff: dojo.uri.dojoUri('src/widget/templates/check_off.gif'),

	fillInTemplate: function(){

		// FIXME: if images are disabled, we DON'T want to swap out the element
		// we can use the usual 'load image to check' trick
		// i don't know what image we can check yet, so we'll skip this for now...

		// this._testImg = document.createElement("img");
		// document.body.appendChild(this._testImg);
		// this._testImg.src = "spacer.gif?cachebust=" + new Date().valueOf();
		// dojo.connect(this._testImg, 'onload', this, 'onImagesLoaded');

		this.onImagesLoaded();
	},

	onImagesLoaded: function(){

		// FIXME: if we actually check for loading images, remove the thing here
		// document.body.removeChild(this._testImg);

		// 'hide' the checkbox
		this.domNode.style.position = "absolute";
		this.domNode.style.left = "-9000px";

		// create a replacement image
		this.imgNode = document.createElement("img");
		dojo.html.addClass(this.imgNode, "dojoHtmlCheckbox");
		this.updateImgSrc();
		dojo.event.connect(this.imgNode, 'onclick', this, 'onClick');
		dojo.event.connect(this.domNode, 'onchange', this, 'onChange');
		this.domNode.parentNode.insertBefore(this.imgNode, this.domNode.nextSibling)

		// real ugly - make sure the image has all the events that the checkbox did
		for(var i=0; i<this._events.length; i++){
			if(this.domNode[this._events[i]]){
				dojo.event.connect(	this.imgNode, this._events[i], 
									this.domNode[this._events[i]]);
			}
		}
	},

	onClick: function(){

		this.domNode.checked = !this.domNode.checked ? true : false;
		this.updateImgSrc();
	},

	onChange: function(){

		this.updateImgSrc();
	},

	updateImgSrc: function(){

		this.imgNode.src = this.domNode.checked ? this.srcOn : this.srcOff;
	}
});