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Runs accessibility checking against loaded page
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.icu/scripts/383641/702363/ARIA%20Favlets.js
// ARIA favlet via http://www.manateeroad.com/favelets/revealariaCheck.js
var ariaCheck = {
start: function(myDocument){
//Instead of window. for global
//we use aA. so that we don't have
//variables that might get mixed in
//with site-level js
var aA=[];
// counting
aA.foundCount = 0;
//for id of added spans
//so we can removed them
aA.idi=0;
//for frames outside domain
//so we can report them
aA.framemsg='';
aA.fi=0;
// for landmark outline styles
// so we can keep switching them
// even through frames
aA.cx=-1;
aA.bx=-1;
aA.wx=-1;
//might as well have these here too
aA.c=['#800000','#000080','#006D00','#800080','#202020'];
aA.b=['solid','dotted','dashed','double','solid','double'];
aA.w=['2','2','2','4','3','6'];
//recursive through frames
aA = ariaCheck.checkFrames(myDocument,aA);
//reporting
ariaCheck.provideMessage(aA);
},
checkFrames: function(myDocument,aA){
//run ariaCheck.aria123 check for current document which might
//have frames or aria or both
aA = ariaCheck.aria123(myDocument,aA);
//run ariaCheck.checkFrames for each frame's document if there
//are any frames
var frametypes=['frame','iframe','ilayer'];
for (var x=0;x<frametypes.length;x++) {
var myframes=myDocument.getElementsByTagName(frametypes[x]);
for (var y=0;y<myframes.length;y++) {
try {
//alert('in try');
ariaCheck.checkFrames(myframes[y].contentWindow.document,aA);
} catch(e) {
//errors are stored in aA too
aA.framemsg=aA.framemsg + '\n' + myframes[y].src;
aA.fi=aA.fi + 1;
}
}
}
return aA;
},
provideMessage: function(aA) {
var pl, pl1, pl2;
if(aA.foundCount!=1){
pl='s';
pl1='are indicated by';
pl2='were';
} else {
pl='';
pl1='is indicated by an';
pl2='was';
}
var m = [
'No ARIA attributes were found.',
'No aria attributes were found and by that we mean no roles, no tabindex of -1, and no attributes starting with ariaCheck.',
'No, no ARIA attributes here.',
'Not a single aria attribute was found - not one!',
'Nope, no aria attributes here either! The spec isnt even final yet, you know.'
];
var mx = Math.floor(Math.random()*5);
if(aA.foundCount==0) {
alert(m[mx]);
} else {
alert(aA.foundCount + ' element' + pl + ' with ARIA ' + pl2 + ' found and ' + pl1 + ' h6 heading' + pl + '.');
}
// alert(alertmessage);
},
inArray: function(arr, obj) {
for(var i=0; i<arr.length; i++) {
if (arr[i] == obj) return true;
}
return false;
},
aria123: function(mydocument,aA){
if (mydocument == null) {
return;
}
//create object just to check length of the properties array
var jt_generic_obj = mydocument.createElement('var');
var ie7 = false;
if (jt_generic_obj.attributes.length > 0) {
ie7 = true;
}
//changes as we add things
var eLive;
if (mydocument.all) {
// ie
eLive = mydocument.all;
// .attributes does not work til 2
} else {
eLive = mydocument.getElementsByTagName('*');
}
//static (e won't change - don't use eLive while editing page)
var e = [];
for (var ij=0; ij<eLive.length;ij++) {
e[ij] = eLive[ij];
}
for (var i = 0; i < e.length; i++) {
// EACH OBJECT
//remove anything added last time favelet ran
var myExpress1 = /ariastAdded.*/;
if (((ie7 && e[i].attributes && e[i].attributes.id.specified) || (!(ie7) && e[i].hasAttribute('id'))) && myExpress1.test(e[i].getAttribute('id'))) {
e[i].parentNode.removeChild(e[i]);
continue;
}
//original favelet code from revealARIA
var myText = 'Found: ';
/*
// Check for role
// ie7 cannot do this
if ((!(ie7) && e[i].hasAttribute('role'))) {
myRole=e[i].getAttribute('role');
myText = myText + ' role="' + myRole + '" ';
}
*/
//Check for aria- attributes
if (e[i].attributes) {
for (var x = 0; x < e[i].attributes.length; x++) {
var myA = e[i].attributes[x].nodeName.toLowerCase();
//alert(myA + ' is ' + e[i].getAttribute(myA) );
var myExpress = /ariaCheck.*/;
// ie7 if below is only needed when
// ie8 immitates ie7 - as then the aria attributes are in
// the ie7-style list of empty attributes
if ((!ie7 || (ie7 && e[i].attributes[x].specified)) && ((myExpress.test(myA) && e[i].getAttribute(myA)!=null) || (myA=='tabindex' && e[i].getAttribute(myA)=='-1') ||
(myA=='role' && e[i].getAttribute(myA)!=null))) {
myText = myText + ' ' + myA + '="' + e[i].getAttribute(myA) + '"';
//check for items with ids
var value_is_id_attributes = ['aria-controls','aria-describedby','aria-flowto','aria-labelledby','aria-labeledby','aria-owns','aria-activedescendant'];
// all can have a list of ids, except aria-activedescendant
if (ariaCheck.inArray(value_is_id_attributes,myA)) {
//report on the attribute
//get array of ids
var id_array = e[i].getAttribute(myA).split(' ');
for (var mapi=0;mapi<id_array.length;mapi++) {
//var myAid=e[i].getAttribute(myA);
var myAid=id_array[mapi];
//alert(mydocument.getElementById(myAid));
if (mydocument.getElementById(myAid) != undefined && mydocument.getElementById(myAid) != null) {
//get object
var myIdTarget=mydocument.getElementById(myAid);
var myTextNode2 = mydocument.createTextNode('<'+myIdTarget.tagName.toLowerCase()+' id="'+myAid+'">');
//create message
var mySpan2 = mydocument.createElement('h6');
mySpan2.setAttribute('id', ('ariastAddedid' + i));
//style message
mySpan2.style.color='navy';
mySpan2.style.fontSize='small';
mySpan2.style.fontWeight='bold';
mySpan2.style.backgroundColor='#f5deb3';
mySpan2.style.margin='0';
mySpan2.style.padding='2px';
//append attribute info
mySpan2.appendChild(myTextNode2);
//place message for id's object
var firstthing = myIdTarget.childNodes[0];
if (firstthing == undefined) {firstthing = null;}
myIdTarget.insertBefore(mySpan2,firstthing);
} else {
myText = myText+' [NO ID MATCH] ';
}
}
}
}
}
}
//Results per element
if (myText != 'Found: ') {
aA.foundCount++;
//get color
aA.cx=(aA.cx+1)%5;
//get border
aA.bx=(aA.bx+1)%6;
//get width
aA.wx=(aA.wx+1)%6;
//outline
e[i].style.border=aA.w[aA.wx] + 'px ' + aA.b[aA.bx] + ' ' + aA.c[aA.cx];
e[i].style.marginTop='0';
//create message
var mySpan = document.createElement('h6');
mySpan.setAttribute('id', ('ariastAdded' + i));
var myTextNode = document.createTextNode(myText);
mySpan.appendChild(myTextNode);
//style message
mySpan.style.color=aA.c[aA.cx];
mySpan.style.fontSize='small';
mySpan.style.backgroundColor='#f5deb3';
mySpan.style.border=aA.w[aA.wx] + 'px ' + aA.b[aA.bx] + ' ' + aA.c[aA.cx];
mySpan.style.borderBottom='0';
mySpan.style.padding='2px';
mySpan.style.margin='0px';
mySpan.style.clear='left';
if (e[i].clientWidth && (e[i].clientWidth > 72)) {
mySpan.style.width=e[i].clientWidth - 4 + 'px';
}
// place message just before element it is about
e[i].parentNode.insertBefore(mySpan,e[i]);
//create end message
var myEnd = document.createElement('div');
myEnd.setAttribute('id', ('ariastAddedend' + i));
var myEndTextNode = document.createTextNode('END Element');
myEnd.appendChild(myEndTextNode);
//style end message offscreen
myEnd.style.position='fixed';
myEnd.style.left='-199px';
myEnd.style.top='auto';
myEnd.width='1px';
myEnd.height='1px';
myEnd.overflow='hidden';
// place end message just after element it is about
e[i].parentNode.insertBefore(myEnd,e[i].nextSibling);
}
}
// close going through each object
//Return argument array
return aA;
}
};
//Feb 21, 2013
//the main code from the quick and dirty favelet that used
//to be revealariaCheck.js has been copied into the framework of
//the Landmarks favelet, so it can go through frames & reuse other features
//Marks targets of every WAI-ARIA id reference, even when they are in lists