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我想弄清楚當前頁面的php $ var是否可以傳遞給XMLHttpRequest2。被調用的文件位於/ assets/js目錄中的視圖（當前php頁面所在位置）的文件夾之外。我也使用CodeIgniter。嘗試傳遞$ user_id以在XMLHttpRequest2請求文件的側面使用SQL查詢。
publication_call.php（當前文件）
<form>
<input type="hidden" id="someid" value="<?= $idz ?>"/>
<?php
echo form_label('Validation: (Enter Publication keywords, Matches will appear in Dropdown >)');
echo form_label('Matching<br>Publications:');
?>
<select name="matched_pub" id="matched_pub"></select>
</form>
<script>
jQuery(function($){
//still want to bind the change event
$('#matched_pub').bind('change', function(){
$('#title').val($('#matched_pub option:selected').text());
});
$('#validation').keyup(function() {
showKeywords($('#validation').val());
document.getElementById('matched_pub').style.display='block';
});
});
</script>
<script>
function showKeywords(str)
{
if (document.getElementById("matched_pub")) {
if (str.length==0)
{
document.getElementById("matched_pub").innerHTML="";
document.getElementById("matched_pub").innerHTML=xmlhttp2.responseText;
return;
}
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp2=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp2=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp2.onreadystatechange=function()
{
if (xmlhttp2.readyState==4 && xmlhttp2.status==200)
{
document.getElementById("matched_pub").innerHTML=xmlhttp2.responseText;
}
}
xmlhttp2.open("GET","/assets/keywordsearch.php?b="+str,true);
xmlhttp2.send();
}
}
</script>
searchwords.php（請求/外部文件）
<?php
$user = 'root';
$pass = 'root';
$db = 'hey_there';
$host = 'localhost';
$conn = mysql_connect($host, $user, $pass);
$db_selected = mysql_select_db($db, $conn);
//trying to display special chars
mysql_query("set names 'utf8'");
if(!$db_selected) {
echo 'broke';
}
//echo 'db connected';
$q = $_GET["b"];
//explode and parse $q into all the fragments separated by spaces and do full text search +word1 +word2 +word3, this will ignore HTML tags as it ignores word order, will also solve the middle initial problem [db setup is not compatible with full text search, but can do likes per word, less efficient, but how it must be done]
$queryWords = explode(' ', $q);
//for services query, explode the query into words and search for each separately
$query = "SELECT DISTINCT(pub_title)
FROM teacher_publications
JOIN users ON teacher_publications.user_id = users.id
WHERE keywords IS NOT NULL
AND pub_title IS NOT NULL
AND teacher_publications.user_id = 103 <-- $var will go here
";
$queryServicesLoop = '';
$queryServicesEnd = ' ORDER BY pub_title ASC';
//loop through all words in string
foreach($queryWords as $queryWord) {
$queryServicesLoop .= " AND (keywords LIKE '%{$queryWord}%')";
}
$queryServices = $queryServices.$queryServicesLoop;
$queryServices = $queryServices.$queryServicesEnd;
$resultServices = mysql_query($queryServices);
$services ='';
if(mysql_num_rows($resultServices) > 0){
while($rowServices = mysql_fetch_assoc($resultServices)) {
$services .= '<option value="' . $rowServices['pub_title'] . '">' . $rowServices['pub_title'] . '</option>';
}
}
if(mysql_num_rows($resultServices) == 0)
{
echo '<option value="">Your search failed to find any matching results.</option>';
}
else
{
echo '' . $services . '';
}
/* ============== ================ 編輯代碼 ============================== */
publication_call.php（當前文件）
<input type="hidden" id="someid" value="<?= $user_id ?>"/>
<script>
function showKeywords(str)
{
if (document.getElementById("matched_pub")) {
if (str.length==0)
{
document.getElementById("someid");
document.getElementById("matched_pub").innerHTML="";
document.getElementById("matched_pub").innerHTML=xmlhttp2.responseText;
return;
}
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp2=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp2=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp2.onreadystatechange=function()
{
if (xmlhttp2.readyState==4 && xmlhttp2.status==200)
{
document.getElementById("matched_pub").innerHTML=xmlhttp2.responseText;
}
}
xmlhttp2.open("GET","/assets/keywordsearch.php?b="+str+"&user_id="+document.getElementById('someid'), true);
// xmlhttp2.open("GET","/assets/keywordsearch.php?b="+str,true);
xmlhttp2.send();
}
}
</script>
searchwords.php（請求/外部文件）
$usr = $_GET["user_id"];
$query = "SELECT DISTINCT(pub_title)
FROM teacher_publications
JOIN users ON teacher_publications.user_id = users.id
WHERE keywords IS NOT NULL
AND pub_title IS NOT NULL
AND teacher_publications.user_id = ".$usr."
「;
php在服務器上運行，javascript運行在客戶端上。 PHP不能發出ajax請求，它只能響應它們。你可以在頁面創建時嵌入任何你想要的東西，或者讓php響應ajax調用，但是你不能使用php來做一個xmlhttprequest（aka ajax）。 –