2015年12月15日 星期二

php 與 ajax 傳值

直接看範例

ajax.html 
<!DOCTYPE html>
<html>
<head>
<meta charset="utf8">
<script>
function showHint(str) {
     if (str.length == 0) {
         document.getElementById("txtHint").innerHTML = "";
         return;
     } else {
         var xmlhttp = new XMLHttpRequest();
         xmlhttp.onreadystatechange = function() {
             if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                 document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
             }
         }
         xmlhttp.open("GET", "gethint.php?q="+str, true);
         xmlhttp.send();
     }
}
</script>
</head>
<body>

<p><b>請輸入要查詢名字:</b></p>
<form>
姓名: <input type="text" onkeyup="showHint(this.value)">
</form>
<p>提示建議: <span id="txtHint"></span></p>
</body>
</html>

gethint.php

 <?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 === "" ? "找不到" : $hint;
?>


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