PHP Ajax搜索示例

PHP Ajax搜索

搜索界面search.html

<!DOCTYPE html>
<html>
<head>
        <meta charset="UTF-8">
        <style>
                span {
                        color: green;
                }
        </style>

        <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", "php_ajax.php?q=" + str, true);
                xmlhttp.send();
            }
        }
        </script>

</head>
<body>

<p><b>搜索您最喜欢的教程:</b></p>

<form>
        <input type = "text" onkeyup = "showHint(this.value)">
</form>

<p>课程的名字: <span id="txtHint"></span></p>

</body>
</html>

上面的代码打开一个文件，名字叫做php_ajax.php，使用GET方法，所以我们需要创建一个文件，在同一目录中名为php_ajax.php的名称，将输出将id为txtHint的元素中。

处理脚本php_ajax.php

<?php
// 这些数据在真实的案例中 一般从数据库查询出来
$a[] = "Android";
$a[] = "B 语言";
$a[] = "C 语言";
$a[] = "D 语言";
$a[] = "euphoria";
$a[] = "F#";
$a[] = "GWT";
$a[] = "HTML5";
$a[] = "ibatis";
$a[] = "Java";
$a[] = "K 语言";
$a[] = "Lisp";
$a[] = "Microsoft technologies";
$a[] = "Networking";
$a[] = "Open Source";
$a[] = "Prototype";
$a[] = "QC";
$a[] = "Restful web services";
$a[] = "Scrum";
$a[] = "Testing";
$a[] = "UML";
$a[] = "VB Script";
$a[] = "Web Technologies";
$a[] = "Xerox Technology";
$a[] = "YQL";
$a[] = "ZOPL";

$q = $_REQUEST["q"];
$hint = "";

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";
                        }
                }
        }
}
echo $hint === "" ? "请你输入合法的教程名字" : $hint;
?>

搜索效果如下图所示