JQuery diary 5.11Sizzle selector (5)

Set the variables and methods corresponding to the current document and document. setDocumentSizzlesetDocumentfunction (node) {varhasCompare. If node is Element, if the documentnode to which node belongs is Document, return nodenode as null.

// Set the variables and methods for the current document and document

SetDocument = Sizzle. setDocument = function (node) {var hasCompare, // If node is Element, the system returns the document to which node belongs. // If node is Document, the system returns the node when node is empty? Node. ownerDocument | node: preferredDoc, // windowparent = doc to which the document belongs. defaultView; // If no document and documentElement is available, returnif (doc = document | doc. nodeType! = 9 |! Doc.doc umentElement) {return document;} // Set the global document to the current docdocument = doc; docElem = doc.doc umentElement; // Support testsdocumentIsHTML =! IsXML (doc); // Support: IE> 8 // If iframe document is assigned to "document" variable and if iframe has been reloaded, // IE will throw "permission denied" error when accessing "document" variable, see jQuery #13936 // IE6-8 do not support the defaultView property so parent will be undefined/** if the iframe document has been specified and if iframe is overloaded * When the document variable is accessed, IE will throw "permission denied" Error * The IE6-8 does not support defaultView so pa The rent variable is undefined * // so you need to re-setDocument () when unload. // This judgment indicates that the current code is in the frame if (parent & parent! = Parent. top) {// IE11 does not have attachEvent, so all must suffer // reset entif (parent. addEventListener) {parent. addEventListener ("unload", function () {// not passed into your documentemediaworkflow Doc umentsetDocument () ;}, false) ;}else if (parent. attachEvent) {parent. attachEvent ("onunload", function () {setDocument () ;}}// some capability checks are added to support/* Attributes -------------------------------------------- -------------------------- * // Support: IE <8 // Verify that getAttribute really returns attributes and not properties (excluding IE8 booleans) // IE8 div. getAttribute ("className") will get classsupport. attributes = assert (function (div) {div. className = "I"; return! Div. getAttribute ("className") ;});/* getElement (s) By * alias * // Check if getElementsByTagName ("*") returns only elements // check whether getElementsByTagName only returns Element support. getElementsByTagName = assert (function (div) {div. appendChild (doc. createComment (""); return! Div. getElementsByTagName ("*"). length;}); // Check if getElementsByClassName can be trusted // Check whether getElementsByClassName can correctly handle multiple classes. getElementsByClassName = rnative. test (doc. getElementsByClassName) & assert (function (div) {div. innerHTML = ""; // Support: Safari <4 // Catch class over-cachingdiv.firstChild.className = "I"; // Support: Opera <10 // Catch gEBCN failure to find non-leading classes Return div. getElementsByClassName ("I "). length = 2;}); // Support: IE <10 // Check if getElementById returns elements by name // The broken getElementById methods don't pick up programatically-set names, // so use a roundabout getElementsByName test // check whether getElementById returns the support element based on the name. getById = assert (function (div) {docElem. appendChild (div ). id = expando; return! Doc. getElementsByName |! Doc. getElementsByName (expando ). length ;}); // ID find and filterif (support. getById) {Expr. find ["ID"] = function (id, context) {if (typeof context. getElementById! ==Strundefined & documentIsHTML) {var m = context. getElementById (id); // Check parentNode to catch when Blackberry 4.6 returns // nodes that are no longer in the document #6963 return m & m. parentNode? [M]: [] ;}}; Expr. filter ["ID"] = function (id) {// convert the Escape Character back to the string var attrId = id. replace (runescape, funescape); return function (elem) {return elem. getAttribute ("id") === attrId ;};};} else {// Support: IE6/7 // getElementById is not reliable as a find your cut // IE6, because the getElementById of 7 returns the element // Based on the name, the native getElementById method cannot be used to obtain the element //. Therefore, delete Expr. find ["ID"]; Expr. filter ["ID"] = function (id) {var attrId = Id. replace (runescape, funescape); return function (elem) {var node = typeof elem. getAttributeNode! = Strundefined & elem. getAttributeNode ("id"); return node & node. value === attrId ;};}/// Tag // getElementsByTagName whether only the Element Expr is returned. find ["TAG"] = support. getElementsByTagName? Function (tag, context) {if (typeof context. getElementsByTagName! = Strundefined) {return context. getElementsByTagName (tag) ;}: function (tag, context) {var elem, tmp = [], I = 0, results = context. getElementsByTagName (tag); // Filter out possible commentsif (tag = "*") {while (elem = results [I ++]) {if (elem. nodeType = 1) {tmp. push (elem) ;}} return tmp;} return results ;}; // ClassExpr. find ["CLASS"] = support. getElementsByClassName & function (classN Ame, context) {if (typeof context. getElementsByClassName! = Strundefined & documentIsHTML) {return context. getElementsByClassName (className) ;};/* QSA/matchesSelector extends * // QSA and matchesSelector support // matchesSelector (: active) reports false when true (IE9/Opera 11.5) rbuggyMatches = []; // qSa (: focus) reports false when true (Chrome 21) // We allow this because of a bug in IE8/9 that throws an error // whenever 'document. activeElement 'is accessed on an iframe // So, we allow: focus to pass through QSA all the time to avoid the IE error // See http://bugs.jquery.com/ticket/13378rbuggyQSA = []; If (support. qsa = rnative. test (doc. querySelectorAll) {// Build QSA regex // Regex strategy adopted from Diego Periniassert (function (div) {// Select is set to empty string on purpose // This is to test IE's treatment of not explicitly // setting a boolean content attribute, // since its presence shocould be enough // http://bugs.jquery.com/ticket/12359div.innerHTML =""; // Support: IE8, Opera 10-12 // Nothing shocould be selected when empty strings follow ^ = or $ = or * = if (div. querySelectorAll ("[t ^ =''] "). length) {rbuggyQSA. push ("[* ^ $] =" + whitespace + "*(?: ''| \" \ ")");} // Support: IE8 // Boolean attributes and "value" are not treated correctlyif (! Div. querySelectorAll ("[selected]"). length) {rbuggyQSA. push ("\ [" + whitespace + "*(?: Value | "+ booleans +") ");} // Webkit/Opera-: checked shoshould return selected option elements // http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked// IE8 throws error here and will not see later testsif (! Div. querySelectorAll (": checked "). length) {rbuggyQSA. push (": checked") ;}}); assert (function (div) {// Support: Windows 8 Native Apps // The type and name attributes are restricted. innerHTML assignmentvar input = doc. createElement ("input"); input. setAttribute ("type", "hidden"); div. appendChild (input ). setAttribute ("name", "D"); // Support: IE8 // Enforce case-sensitivity of name attributeif (Div. querySelectorAll ("[name = d]"). length) {rbuggyQSA. push ("name" + whitespace + "* [* ^ $ |! ~]? = ");} // FF 3.5-: enabled/: disabled and hidden elements (hidden elements are still enabled) // IE8 throws error here and will not see later testsif (! Div. querySelectorAll (": enabled "). length) {rbuggyQSA. push (": enabled", ": disabled");} // Opera 10-11 does not throw on post-comma invalid pseudo dosdiv. querySelectorAll ("*,: x"); rbuggyQSA. push (",. *: ") ;}) ;}if (support. matchesSelector = rnative. test (matches = docElem. webkitMatchesSelector | docElem. extends matchesselector | docElem. oMatchesSelector | docElem. msMatchesSelector) {assert (function (div) {// Check to see if it's possible to do matchesSelector // on a disconnected node (IE 9) support. disconnectedMatch = matches. call (div, "div"); // This shoshould fail with an exception // Gecko does not error, returns false insteadmatches. call (div, "[s! = '']: X"); rbuggyMatches. push ("! = ", Pseudo DoS) ;}) ;}rbuggyqsa = rbuggyQSA. length & new RegExp (rbuggyQSA. join ("|"); rbuggyMatches = rbuggyMatches. length & new RegExp (rbuggyMatches. join ("|");/* Contains ---------------------------------------------------------------------- */hasCompare = rnative. test (docElem. compareDocumentPosition); // Element contains another // Purposefully does not implement passive descendent // As in, Element does not contain itself // when the node contains itself, returns truecontains = hasCompare | rnative. test (docElem. contains )? Function (a, B) {// a is Document, and adown is HtmlElement. Others are avar adown = a. nodeType = 9? A.doc umentElement: a, // bup is the parent node of Node B. bup = B & B. parentNode; // (1) If a is the parent node of B, return true quickly. // (2) if B has a parent node and its parent node is Element // a contains B, the returned result is truereturn a === bup | !! (Bup & bup. nodeType = 1 & (adown. contains? // Contains is bup, But B is returned to avoid trueadown when contains are themselves. contains (bup): // Why & 16, please refer to the return value of compareDocumentPosition/* 000000 0 element consistent 000001 1 node in different documents (or one out of the document) 000010 2 node B before node A 000100 4 node A before Node B 001000 8 Node B contains node A010000 16 node A contains node B100000 32 browser private use */. compareDocumentPosition &. compareDocumentPosition (bup) & 16);}: // when no native method is available, iteration judge function (a, B) {if (B) {// an ancestor node of B ==== a indicates that a contains bwhile (B = B. p ArentNode) {if (B = a) {return true ;}} return false ;};/* Sorting condition * // Document order sortingsortOrder = hasCompare? Function (a, B) {// Flag for duplicate removalif (a = B) {hasDuplicate = true; return 0 ;} // Sort on method existence if only one input has compareDocumentPosition // if only one element has the sorting method. // node a has a sorting method to return-1, and Node B has a sorting method to return 1var compare =! A. compareDocumentPosition -! B. compareDocumentPosition; if (compare) {return compare;} // Calculate position if both inputs belong to the same document // compare = (. ownerDocument | a) === (B. ownerDocument | B )? A. compareDocumentPosition (B): // Otherwise we know they are disconnected1; // Disconnected nodes // If the node is no longer the same document or does not support separation and sorting and, B is no longer the same document if (compare & 1 | (! Support. sortDetached & B. compareDocumentPosition (a) === compare )) {// Choose the first element that is related to our preferred document // If node a is included in the current document, return-1if (a = doc |. ownerDocument === preferredDoc & contains (preferredDoc, a) {return-1;} // If node B is included in the current doucment, return 1if (B === doc | B. ownerDocument === preferredDoc & contains (preferredDoc, B) {return 1;} // Maintain original order // Keep original order return sortInput? (IndexOf. call (sortInput, a)-indexOf. call (sortInput, B): 0;} // compare // a returns-1 before B; otherwise, 1 return compare & 4? -1: 1;}: function (a, B) {// Exit early if the nodes are identicalif (a = B) {hasDuplicate = true; return 0 ;} var cur, I = 0, aup =. parentNode, bup = B. parentNode, ap = [a], bp = [B]; // Parentless nodes are either documents or disconnected // if (! Aup |! Bup) {// if a is a document, it means a first returns-1 // If B is a document, B first returns 1 // otherwise, if a has a parent node, B is disconnected and-1/is returned/ /otherwise, if B has a parent node and a is disconnected, return 1 // If a and B are both disconnected, use the indexOf method return a = doc? -1: B = doc? 1: aup? -1: bup? 1: sortInput? (IndexOf. call (sortInput, a)-indexOf. call (sortInput, B): 0; // If the nodes are siblings, we can do a quick check // the father is a, using siblingCheck (a, B) method Quick check} else if (aup === bup) {return siblingCheck (a, B );} // Otherwise we need full lists of their ancestors for comparison // Otherwise, traverse the entire ancestor cur = a; while (cur = cur. parentNode) {// Add all the ancestors of a to the stack ap. unshift (cur);} cur = B; while (cur = cur. parentNode )) {// Put all the ancestors of B into the stack bp. unshift (cur);} // Walk down the tree looking for a discrepancy // If the ancestor of the same layer is a while (ap [I] === bp [I]) {I ++;} return I? // Do a sibling check if the nodes have a common ancestor // compare the position of siblingCheck (ap [I], bp [I]): // Otherwise nodes in our document sort firstap [I] === preferredDoc? -1: bp [I] === preferredDoc? 1: 0;}; // return documentreturn doc ;};