XPath misollari
Keling, bir nechta misollarni ko‘rib chiqib, XPath’ning asosiy sintaksisini o‘rganishga harakat qilamiz.
Misol uchun XML hujjat
Quyidagi misollarda biz quyidagi XML hujjatdan foydalanamiz.
"books.xml":
<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
<book category="cooking">
<title lang="en">Everyday Italian</title>
<author>Giada De Laurentiis</author>
<year>2005</year>
<price>30.00</price>
</book>
<book category="children">
<title lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
<book category="web">
<title lang="en">XQuery Kick Start</title>
<author>James McGovern</author>
<author>Per Bothner</author>
<author>Kurt Cagle</author>
<author>James Linn</author>
<author>Vaidyanathan Nagarajan</author>
<year>2003</year>
<price>49.99</price>
</book>
<book category="web">
<title lang="en">Learning XML</title>
<author>Erik T. Ray</author>
<year>2003</year>
<price>39.95</price>
</book>
</bookstore>"books.xml" faylini brauzeringizda ko‘ring.
XML hujjatni yuklash
XML hujjatlarni yuklash uchun XMLHttpRequest obyektidan foydalanish barcha zamonaviy brauzerlarda qo‘llab-quvvatlanadi.
var xmlhttp = new XMLHttpRequest();
Tugunlarni tanlash
Afsuski, turli brauzerlarda XPath bilan ishlashning turli usullari mavjud.
Chrome, Firefox, Edge, Opera va Safari tugunlarni tanlash uchun evaluate() metodidan foydalanadi:
xmlDoc.evaluate(xpath, xmlDoc, null, XPathResult.ANY_TYPE,null);Internet Explorer tugunni tanlash uchun selectNodes() metodidan foydalanadi:
xmlDoc.selectNodes(xpath);Misollarimizga ko‘pchilik asosiy brauzerlarda ishlashi kerak bo‘lgan kodni kiritganmiz.
Barcha sarlavhalarni tanlash
Quyidagi misol barcha title tugunlarini tanlaydi:
Birinchi kitobning sarlavhasini tanlash
Quyidagi misol bookstore elementi ostidagi birinchi book tugunining sarlavhasini (title) tanlaydi:
Barcha narxlarni tanlash
Quyidagi misol barcha price tugunlaridagi matnni tanlaydi:
price>35 bo‘lgan price tugunlarini tanlash
Quyidagi misol narxi 35 dan yuqori bo‘lgan barcha price tugunlarini tanlaydi:
price>35 bo‘lgan title tugunlarini tanlash
Quyidagi misol narxi 35 dan yuqori bo‘lgan barcha title tugunlarini tanlaydi:
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