AJAX PHP
AJAX yanada interaktiv ilovalar yaratish uchun ishlatiladi.
AJAX PHP misoli
Quyidagi misol foydalanuvchi kiritish maydoniga belgilar yozayotganda veb-sahifa veb-server bilan qanday aloqa qilishi mumkinligini ko‘rsatadi:
Misol
Quyidagi kiritish maydoniga ism yozishni boshlang:
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.php?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 PHP faylga (gethint.php) yuborish
- E’tibor bering, q parametri qo‘shilgan: gethint.php?q="+str
- str o‘zgaruvchisi kiritish maydonining tarkibini saqlaydi
PHP fayl - "gethint.php"
PHP fayl ismlar massivini tekshiradi va mos keladigan ism(lar)ni brauzerga qaytaradi:
<?php
// Array with names
$a[] = "Anna";
$a[] = "Brittany";
$a[] = "Cinderella";
$a[] = "Diana";
$a[] = "Eva";
$a[] = "Fiona";
$a[] = "Gunda";
$a[] = "Hege";
$a[] = "Inga";
$a[] = "Johanna";
$a[] = "Kitty";
$a[] = "Linda";
$a[] = "Nina";
$a[] = "Ophelia";
$a[] = "Petunia";
$a[] = "Amanda";
$a[] = "Raquel";
$a[] = "Cindy";
$a[] = "Doris";
$a[] = "Eve";
$a[] = "Evita";
$a[] = "Sunniva";
$a[] = "Tove";
$a[] = "Unni";
$a[] = "Violet";
$a[] = "Liza";
$a[] = "Elizabeth";
$a[] = "Ellen";
$a[] = "Wenche";
$a[] = "Vicky";
// get the q parameter from URL
$q = $_REQUEST["q"];
$hint = "";
// lookup all hints from array if $q is different from ""
if ($q !== "") {
$q = strtolower($q);
$len=strlen($q);
foreach($a as $name) {
if (stristr($q, substr($name, 0, $len))) {
if ($hint === "") {
$hint = $name;
} else {
$hint .= ", $name";
}
}
}
}
// Output "no suggestion" if no hint was found or output correct values
echo $hint === "" ? "no suggestion" : $hint;
?>
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