a11y.js
上传用户:kimgenplus
上传日期:2016-06-05
资源大小:20877k
文件大小:2k
- /*
- 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.provide("dojo.a11y");
- dojo.require("dojo.uri.*");
- dojo.require("dojo.html.common");
- dojo.a11y = {imgPath:dojo.uri.moduleUri("dojo.widget", "templates/images"), doAccessibleCheck:true, accessible:null, checkAccessible:function () {
- if (this.accessible === null) {
- this.accessible = false;
- if (this.doAccessibleCheck == true) {
- this.accessible = this.testAccessible();
- }
- }
- return this.accessible;
- }, testAccessible:function () {
- this.accessible = false;
- if (dojo.render.html.ie || dojo.render.html.mozilla) {
- var div = document.createElement("div");
- div.style.backgroundImage = "url("" + this.imgPath + "/tab_close.gif")";
- dojo.body().appendChild(div);
- var bkImg = null;
- if (window.getComputedStyle) {
- var cStyle = getComputedStyle(div, "");
- bkImg = cStyle.getPropertyValue("background-image");
- } else {
- bkImg = div.currentStyle.backgroundImage;
- }
- var bUseImgElem = false;
- if (bkImg != null && (bkImg == "none" || bkImg == "url(invalid-url:)")) {
- this.accessible = true;
- }
- dojo.body().removeChild(div);
- }
- return this.accessible;
- }, setCheckAccessible:function (bTest) {
- this.doAccessibleCheck = bTest;
- }, setAccessibleMode:function () {
- if (this.accessible === null) {
- if (this.checkAccessible()) {
- dojo.render.html.prefixes.unshift("a11y");
- }
- }
- return this.accessible;
- }};