{"id":799,"date":"2010-10-01T11:48:25","date_gmt":"2010-10-01T11:48:25","guid":{"rendered":"http:\/\/enjoyasp.net\/?p=799"},"modified":"2010-10-01T11:48:25","modified_gmt":"2010-10-01T11:48:25","slug":"ajax-xpath","status":"publish","type":"post","link":"https:\/\/enjoyasp.net\/index.php\/2010\/10\/01\/ajax-xpath\/","title":{"rendered":"ajax-Xpath"},"content":{"rendered":"

xml\u65b9\u5f0f\u5728\u67e5\u8be2\u67d0\u4e00\u7ed3\u70b9\u65f6\u4e0d\u592a\u65b9\u4fbf\uff0c\u800cXpath\u63d0\u4f9b\u4e86\u5728XML\u6587\u6863\u4e2d\u67e5\u627e\u4efb\u610f\u8282\u70b9\u7684\u89e3\u51b3\u65b9\u6848<\/p>\n

XPath\u8868\u8fbe\u5f0f\u7531\u4e24\u90e8\u5206\u6240\u7ec4\u6210\uff1a\u4e0a\u4e0b\u6587\u8282\u70b9\u548c\u9009\u62e9\u6a21\u5f0f\u3002<\/p>\n

book[@isbn=’0471777781′] \u5728book\u7ed3\u70b9\u6240\u6709\u5b50\u7ed3\u70b9\u4e2d\u67e5\u627eisbn\u5c5e\u6027\u4e3a’0471777781’\u7684\u4f5c\u8005\u5143\u7d20<\/p>\n

1\uff0cIE\u4e2d\u7684XPath<\/strong><\/p>\n

?? ??? ?\u5fae\u8f6f\u901a\u8fc7\u4e24\u79cd\u65b9\u6cd5\u6765\u5b9e\u73b0\u57fa\u4e8eXPath\u8868\u8fbe\u5f0f\u7684\u8282\u70b9\u9009\u62e9\u3002<\/p>\n

?? ??? ??? ?????? \uff081\uff09selectSingleNode()? \u5b83\u5c06\u8fd4\u56de\u5339\u914d\u8868\u8fbe\u5f0f\u7684\u7b2c\u4e00\u4e2a\u8282\u70b9
\n?? ??? ??? ??? ??? ??? ?? var oFirstAuthor = oXmlDom.documentElement.selectSingleNode(“book\/author”);
\n???????????????? \u8fd4\u56de\u662fdocumentElement\u7684\u4e0a\u4e0b\u6587\u4e2d<book\/>\u5143\u7d20\u5b50\u8282\u70b9\u7684\u7b2c\u4e00\u4e2a<author\/>\u5143\u7d20<\/p>\n

?????????????????? \uff082\uff09selectNode() \u8fd4\u56de\u4e00\u4e2aNodeList\uff0c\u5b83\u662f\u6240\u6709\u4e0e\u8be5XPath\u8868\u8fbe\u5f0f\u5339\u914d\u7684\u8282\u70b9\u96c6\uff0c\u8981\u6ce8\u610f\u7684\u4e00\u70b9\u662f\u5982\u679c\u6587\u6863\u4e2d\u6ca1\u6709\u76f8\u5339\u914d\u7684\u5143\u7d20\uff0c\u90a3\u4e48\u8fd8\u662f\u4f1a\u8fd4\u56de\u4e00\u4e2aNodeList\uff0c\u53ea\u662f\u957f\u5ea6\u4e3a0\u3002\u56e0\u6b64\u5728\u4f7f\u7528NodeList\u524d\uff0c\u6700\u597d\u5148\u5224\u65ad\u5176\u957f\u5ea6\u662f\u5426\u5927\u4e8e0\uff1a
\n?
\n??????????? var cAuthors = oXmlDom.documentElement.selectNodes(“book\/author”);<\/p>\n

?? ??? ??? ??? ??? ?if (cAuthors.length > 0) {<\/p>\n

????? ??? ??? ??? ??? ? \/\/\u8fdb\u884c\u64cd\u4f5c<\/p>\n

?? ??? ??? ??? ??? ?}<\/p>\n

2\uff0c Firefox\u4e2d\u7684XPath
\n<\/strong><\/p>\n

????? Firefox\u7684\u5b9e\u73b0\u7248\u672c\u5141\u8bb8XPath\u8868\u8fbe\u5f0f\u4ee5\u76f8\u540c\u65b9\u5f0f\u5728HTML\u548cXML\u6587\u6863\u4e2d\u8fd0\u884c\u3002\u8fd9\u91cc\u6700\u4e3b\u8981\u7684\u5bf9\u8c61\u6709\u4e24\u4e2a\uff1aXPathEvaluator\u548cXPathResult\u3002<\/p>\n

XPathEveluator\u7c7b\u4f7f\u7528evaluate()\u65b9\u6cd5\u5bf9\u7ed9\u5b9a\u7684XPath\u8868\u8fbe\u5f0f\u8fdb\u884c\u6c42\u503c\uff0cevaluate()\u65b9\u6cd5\u5305\u542b\u4e94\u4e2a\u53c2\u6570\uff1a\u9700\u8981\u8ba1\u7b97\u7684XPath\u8868\u8fbe\u5f0f\u5b57\u7b26\u4e32\uff0c\u8868\u8fbe\u5f0f\u6267\u884c\u7684\u4e0a\u4e0b\u6587\u8282\u70b9\uff0c\u547d\u540d\u7a7a\u95f4\u89e3\u6790\u5668\uff08\u5904\u7406\u8868\u8fbe\u5f0f\u4e2d\u547d\u540d\u7a7a\u95f4\u7684\u51fd\u6570\uff09\uff0c\u7ed3\u679c\u7c7b\u578b\uff08\u5141\u8bb810\u79cd\u4e0d\u540c\u7684\u7ed3\u679c\u7c7b\u578b\uff09\u4ee5\u53ca\u5305\u542b\u7ed3\u679c\u7684XPathResult\u5bf9\u8c61\uff08\u5982\u679c\u53c2\u6570\u4e3anull\uff0c\u90a3\u4e48\u8fd4\u56de\u65b0\u7684XPathResult\u5bf9\u8c61\uff09\u3002<\/p>\n

var oEvaluator = new XPathEvaluator();<\/p>\n

var sXPath = “book\/author”;<\/p>\n

var oResult = oEvaluator.evaluate(sXPath,oXmlDom.documentElement,null,<\/p>\n

?????? XPathResult.ORDERED_NODE_ITERATOR_TYPE, null);<\/p>\n

?var aNodes = new Array;<\/p>\n

?if (oResult != null) {<\/p>\n

??? var oElement;<\/p>\n

??? while (oElement = oResult.iterateNext()) {<\/p>\n

?????? aNodes.push(oElement);<\/p>\n

??? }<\/p>\n

}<\/p>\n

evalute()\u65b9\u6cd5\u8fd4\u56de\u7684\u4e0d\u540c\u7ed3\u679c\u7c7b\u578b\uff1a<\/p>\n

q? XPathResult.ANY_TYPE\uff0c\u8fd4\u56de\u4e0d\u786e\u5b9a\u7c7b\u578b\u3002\u8be5\u65b9\u6cd5\u8fd4\u56de\u7684\u7c7b\u578b\u7531\u8868\u8fbe\u5f0f\u8ba1\u7b97\u7684\u7ed3\u679c\u51b3\u5b9a\u3002<\/p>\n

q? XPathResult.ANY_UNORDERED_NODE_TYPE\uff0c\u8fd4\u56de\u901a\u8fc7singleNodeValue\u5c5e\u6027\u8bbf\u95ee\u7684\u67d0\u4e2a\u8282\u70b9\u7684\u8282\u70b9\u96c6\u5408\uff0c\u5982\u679c\u6ca1\u6709\u5339\u914d\u7684\u8282\u70b9\uff0c\u90a3\u4e48\u8fd4\u56denull\u3002\u8fd4\u56de\u7684\u8282\u70b9\u96c6\u5408\u4e0d\u4e00\u5b9a\u6309\u51fa\u73b0\u7684\u987a\u5e8f\u6392\u5217\u3002<\/p>\n

q? XPathResult.BOOLEAN_TYPE\uff0c\u8fd4\u56de\u5e03\u5c14\u503c\u3002<\/p>\n

q? XPathResult.FIRST_ORDERED_NODE_TYPE\uff0c\u8fd4\u56de\u67d0\u4e2a\u8282\u70b9\u7684\u8282\u70b9\u96c6\u5408\u3002\u8be5\u8282\u70b9\u4f7f\u7528XPathResult\u7c7b\u7684singleNodeValue\u5c5e\u6027\u8bbf\u95ee\u3002\u8fd4\u56de\u7684\u8282\u70b9\u662f\u6587\u6863\u4e2d\u7b2c\u4e00\u4e2a\u51fa\u73b0\u7684\u8282\u70b9\u3002<\/p>\n

q? XPathResult.NUMBER_TYPE\uff0c\u8fd4\u56de\u6570\u5b57\u503c\u3002<\/p>\n

q? XPathResult.ORDERED_NODE_ITERATOR_TYPE\uff0c\u8fd4\u56de\u6587\u6863\u987a\u5e8f\u7684\u8282\u70b9\u96c6\u5408\uff08\u4f7f\u7528iterateNext()\u65b9\u6cd5\u904d\u5386\uff09\u3002\u56e0\u6b64\uff0c\u53ef\u4ee5\u5bb9\u6613\u5730\u8bbf\u95ee\u96c6\u5408\u4e2d\u6bcf\u4e2a\u72ec\u7acb\u7684\u8282\u70b9\u3002<\/p>\n

q? XPathResult.ORDERED_NODE_SNAPSHOT_TYPE\uff0c\u8fd4\u56de\u6587\u6863\u987a\u5e8f\u7684\u8282\u70b9\u96c6\u5408\uff08\u7ed3\u679c\u96c6\u5408\u7684\u5feb\u7167\uff09\u3002\u4efb\u4f55\u5bf9\u6587\u6863\u4e2d\u8282\u70b9\u7684\u4fee\u6539\u90fd\u4e0d\u5f71\u54cd\u7ed3\u679c\u3002<\/p>\n

q? XPathResult.STRING_TYPE\uff0c\u8fd4\u56de\u5b57\u7b26\u4e32\u503c\u3002<\/p>\n

q? XPathResult.UNORDERED_NODE_ITERATOR_TYPE\uff0c\u8fd4\u56de\u53ef\u4ee5\u904d\u5386\u7684\u8282\u70b9\u96c6\u5408\uff0c\u7136\u800c\uff0c\u8282\u70b9\u7684\u987a\u5e8f\u4e0e\u5176\u5728\u6587\u6863\u4e2d\u51fa\u73b0\u7684\u987a\u5e8f\u4e0d\u4e00\u5b9a\u4e00\u81f4\u3002<\/p>\n

q? XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE\uff0c\u8fd4\u56de\u65e0\u5e8f\u5feb\u7167\u8282\u70b9\u96c6\u5408\u3002\u4efb\u4f55\u5bf9\u6587\u6863\u4e2d\u8282\u70b9\u7684\u4fee\u6539\u90fd\u4e0d\u5f71\u54cd\u7ed3\u679c\u3002<\/p>\n

\u6700\u5e38\u7528\u7684\u7ed3\u679c\u7c7b\u578b\u662fXPathResult.ORDERED_NODE_ITERATOR_TYPE\uff1a<\/p>\n","protected":false},"excerpt":{"rendered":"

xml\u65b9\u5f0f\u5728\u67e5\u8be2\u67d0\u4e00\u7ed3\u70b9\u65f6\u4e0d\u592a\u65b9\u4fbf\uff0c\u800cXpath\u63d0\u4f9b\u4e86\u5728XML\u6587\u6863\u4e2d\u67e5\u627e\u4efb\u610f\u8282\u70b9\u7684\u89e3\u51b3\u65b9\u6848 XPath\u8868\u8fbe\u5f0f\u7531 […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[],"class_list":["post-799","post","type-post","status-publish","format-standard","hentry","category-ajax"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/799","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/comments?post=799"}],"version-history":[{"count":0,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/posts\/799\/revisions"}],"wp:attachment":[{"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/media?parent=799"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/categories?post=799"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/enjoyasp.net\/index.php\/wp-json\/wp\/v2\/tags?post=799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}