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Empire Burlesque
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| bet | 1/3 | | Sana | 01.04.2024 | | Hajmi | 3.41 Mb. | | #184609 |
Bog'liq 6-10 (1) (2)
6. LABORATORIYA ISHI
Mavzu: AJAX asosida tarmoq dasturini yaratish
Ishning maqsadi:
Java dasturlash XMLHttpRequest obyektidan foydalanib AJAX asosida tarmoq dasturini yaratish.
Topshiriq:
Talaba laboratoriya ishi uchun shaxsiy topshiriq oladi. Bu topshiriq bo‘yicha talaba AJAX asosida tarmoq dasturini yaratadi. Har bir talaba uchun shaxsiy topshiriq beriladi.
Nazariy qism:
AJAX (Asinxron JavaScript va XML) bu ko‘plab veb-texnologiyalardan foydalangan holda klient tomonida asinxron veb-ilovalarni yaratuvchi vositalar to‘plami. Ajax yordamida veb-ilovalar sahifasining ko‘rinishi va ishiga xalaqit bermasdan ma’lumotni serverdan (fonda) asinxron ravishda yuborishi va qabul qilishi mumkin. Ajax veb-sahifalar tarkibini dinamik ravishda butun sahifani qayta yuklamasdan o‘zgartirishga imkon beradi.
AJAX imkoniyatlari:
Sahifani qayta yuklamasdan veb-sahifani yangilash
Sahifa yuklangandan so‘ng serverdan ma’lumotlarni so‘rash
Sahifa yuklangandan so‘ng serverdan ma’lumotlarni qabul qilish
Serverga ma’lumotlarni orqa fonda yuborish
6.1- rasm. AJA XMLHttpRequest obyekti.
Barcha zamonaviy brauzerlar XMLHttpRequest obyektini qo‘llab-quvvatlaydi.
Fonda veb-server bilan ma’lumot almashish uchun XMLHttpRequest obyektidan foydalanish mumkin. Bu shuni anglatadiki, butun sahifani qayta yuklamasdan, veb-sahifaning qismlarini yangilash mumkin.
var xhttp = new XMLHttpRequest();
Xning ishlashi
6.2- rasm. Ajax texnologiyasi asosida Veb ilova
6.1- jadval
XMLHttpRequest obyekt metodlari
Metod
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Tavsifi
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new XMLHttpRequest()
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Creates a new XMLHttpRequest object
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abort()
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Cancels the current request
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getAllResponseHeaders()
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Returns header information
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getResponseHeader()
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Returns specific header information
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open(method, url, async, user, psw)
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Specifies the request
method: the request type GET or POST
url: the file location
async: true (asynchronous) or false (synchronous)
user: optional user name
psw: optional password
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send()
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Sends the request to the server
Used for GET requests
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send(string)
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Sends the request to the server.
Used for POST requests
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setRequestHeader()
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Adds a label/value pair to the header to be sent
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Serverga so‘rov jo‘natish:
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
xhttp.open("POST", "demo_post.asp", true);
xhttp.send();
xhttp.open("POST", "ajax_test.asp", true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.send("fname=Henry&lname=Ford");
xhttp.open("GET", "ajax_info.txt", false);
xhttp.send();
6.2- jadval
Server javobi
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