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PHP - AJAX ? PHP

PHP - AJAX? PHP

AJAX? ?? ??? ??????? ??? ? ?????.

AJAX PHP ??

?? ????? ???? ?? ??? ??? ??? ? ? ???? ? ??? ???? ??? ?????.

QQ圖片20161010101254.png

?? ?? - HTML ???

? ???? ???? ??? ???? "showHint()" ??? ?????. ? ??? "onkeyup" ???? ?? ?????:

<html>
<head>
<script>
function showHint(str)
{
         if (str.length==0)
         {
                 document.getElementById("txtHint").innerHTML="";
                 return;
         }
         if (window.XMLHttpRequest)
         {
                 // IE7+, Firefox, Chrome, Opera, Safari 瀏覽器執(zhí)行的代碼
                 xmlhttp=new XMLHttpRequest();
         }
         else
         {       
                 //IE6, IE5 瀏覽器執(zhí)行的代碼
                 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
         }
         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>在輸入框中輸入一個姓名:</b></p>
<form>
姓名: <input type="text" onkeyup="showHint(this.value)">
</form>
<p>返回值: <span id="txtHint"></span></p>
 
</body>
</html>

?? ?? ??:

?? ??? ?? ?? ??(str.length==0) ? ??? txtHint ?? ???? ????. ??? ???? ??? ?????.

?? ??? ?? ?? ??? showHint()? ?? ??? ?????.

·?? XMLHttpRequest ?? ??

·??? ??? ???????

·?????? ?? ??? ?? ???

·???URL ?? ??? ????(q)? ?????(?? ??? ?? ??).

PHP ??

??? JavaScript? ?? ???? ?? ???? "gethint.php"?? ??? PHP ?????.

"gethint.php"? ?? ??? ?? ??? ???? ?? ??? ????? ?????.

<?php
// 將姓名填充到數組中
$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";
 
//從請求URL地址中獲取 q 參數
$q=$_GET["q"];
 
//查找是否由匹配值, 如果 q>0
if (strlen($q) > 0)
{
         $hint="";
         for($i=0; $i<count($a); $i++)
         {
                 if (strtolower($q)==strtolower(substr($a[$i],0,strlen($q))))
                 {
                          if ($hint=="")
                          {
                                   $hint=$a[$i];
                          }
                          else
                          {
                                   $hint=$hint." , ".$a[$i];
                          }
                 }
         }
}
 
// 如果沒有匹配值設置輸出為 "no suggestion"
if ($hint == "")
{
         $response="no suggestion";
}
else
{
         $response=$hint;
}
 
//輸出返回值
echo $response;
?>

??: JavaScript? ???? ??? ??(?: strlen($q ) > ; 0),

1. JavaScript?? ?? ??? ???? ??? ????.

2. ???? ??? ??? ?? ???? "?? ??"?? ?????.

3. ???? ??? ?? ?? ???? ?? ???? ?? ???? ?????.

4. "txtHint" ?? ???? ??? ????.

PHP Ajax ?? ??? ?? ?? ??

??? ??? ??? ?? ???? ?? ?? PHP Ajax ??? ? ?? ?? ??? ??? ???.


???? ??
||
<html> <head> <script> function showHint(str) { if (str.length==0) { document.getElementById("txtHint").innerHTML=""; return; } if (window.XMLHttpRequest) { // IE7+, Firefox, Chrome, Opera, Safari 瀏覽器執(zhí)行的代碼 xmlhttp=new XMLHttpRequest(); } else { //IE6, IE5 瀏覽器執(zhí)行的代碼 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } 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>在輸入框中輸入一個姓名:</b></p> <form> 姓名: <input type="text" onkeyup="showHint(this.value)"> </form> <p>返回值: <span id="txtHint"></span></p> </body> </html>