AJAX ASP
AJAX yanada interaktiv ilovalar yaratish uchun ishlatiladi.
AJAX ASP misoli
Quyidagi misol foydalanuvchi kiritish maydoniga belgilar yozayotganda veb-sahifa veb-server bilan qanday aloqa qilishi mumkinligini ko‘rsatadi:
Misol
Start typing a name in the input field below:
Misol tushuntirilishi
Yuqoridagi misolda foydalanuvchi kiritish maydoniga belgi yozganda "showHint()" nomli funksiya bajariladi.
Funksiya onkeyup hodisasi orqali ishga tushadi.
Mana HTML kodi:
Misol
<html>
<head>
<script>
function showHint(str) {
if (str.length == 0) {
document.getElementById("txtHint").innerHTML = "";
return;
} else {
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("txtHint").innerHTML = this.responseText;
}
};
xmlhttp.open("GET", "gethint.asp?q=" + str, true);
xmlhttp.send();
}
}
</script>
</head>
<body>
<p><b>Start typing a name in the input field below:</b></p>
<form>
First name: <input type="text" onkeyup="showHint(this.value)">
</form>
<p>Suggestions: <span id="txtHint"></span></p>
</body>
</html>
O‘zingiz sinab ko‘ring »
Kod tushuntirilishi:
Avval kiritish maydoni bo‘shligini tekshiring (str.length == 0). Agar bo‘sh bo‘lsa, txtHint joy egasining tarkibini tozalang va funksiyadan chiqing.
Biroq kiritish maydoni bo‘sh bo‘lmasa, quyidagilarni bajaring:
- XMLHttpRequest obyektini yaratish
- Server javobi tayyor bo‘lganda bajariladigan funksiyani yaratish
- So‘rovni serverdagi ASP faylga (gethint.asp) yuborish
- E’tibor bering, q parametri qo‘shilgan: gethint.asp?q="+str
- str o‘zgaruvchisi kiritish maydonining tarkibini saqlaydi
ASP fayl - "gethint.asp"
ASP fayl ismlar massivini tekshiradi va mos keladigan ism(lar)ni brauzerga qaytaradi:
<%
response.expires=-1
dim a(30)
'Fill up array with names
a(1)="Anna"
a(2)="Brittany"
a(3)="Cinderella"
a(4)="Diana"
a(5)="Eva"
a(6)="Fiona"
a(7)="Gunda"
a(8)="Hege"
a(9)="Inga"
a(10)="Johanna"
a(11)="Kitty"
a(12)="Linda"
a(13)="Nina"
a(14)="Ophelia"
a(15)="Petunia"
a(16)="Amanda"
a(17)="Raquel"
a(18)="Cindy"
a(19)="Doris"
a(20)="Eve"
a(21)="Evita"
a(22)="Sunniva"
a(23)="Tove"
a(24)="Unni"
a(25)="Violet"
a(26)="Liza"
a(27)="Elizabeth"
a(28)="Ellen"
a(29)="Wenche"
a(30)="Vicky"
'get the q parameter from URL
q=ucase(request.querystring("q"))
'lookup all hints from array if length of q>0
if len(q)>0 then
hint=""
for i=1 to 30
if q=ucase(mid(a(i),1,len(q))) then
if hint="" then
hint=a(i)
else
hint=hint & " , " & a(i)
end if
end if
next
end if
'Output "no suggestion" if no hint were found
'or output the correct values
if hint="" then
response.write("no suggestion")
else
response.write(hint)
end if
%>
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