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我有一个结果页面,显示调查答案的图表。这些图表是通过执行 SQL 的 PHP 文件生成的。结果页面需要包含一些过滤,因此我尝试使用 AJAX 更新 SQL 以显示而不重新加载所述结果页面。

通过表格选择过滤器的类型;

<form name="sqlselector" action= "javascript" onsubmit"ajaxFunction('barscompleteCCC.php?     course=' + document.getElementById('course').value);">

<select name="course"> 
<option value="All">All</option>
<?php $result= mysql_query('SELECT * FROM tCourse'); ?> 
<?php while($row= mysql_fetch_assoc($result)) 
{ ?> 
    <option value="<?php echo htmlspecialchars($row['CourseID']);?>"> 
        <?php echo htmlspecialchars($row['CourseName']); ?> 
    </option> 
<?php 
} 
?> 
</select>
<input type="submit" value="Build">
</form>

阿贾克斯是:

ajaxConnection.onreadystatechange = ajaxReply; // whenever the ready state is changed
ajaxConnection.open('GET', url, true); // opens a request to server
ajaxConnection.send(null); // closes the request
// Now, the code waits unless the ready state changes.
// After every change ajaxReply() is executed

    return true;

} // end function ajaxFunction

function ajaxReply() { // your code's logic goes here
    if (ajaxConnection.readyState == 4) 
    { // 4 mean page loaded successfully
        if (ajaxConnection.status == 200) 
        { // 200 mean all is OK
            document.getElementById('course').innerHTML =   ajaxConnection.responseText;            
        } // end if
        else 
        { // if the status code is anything else (a rare case though)
            alert('Something weird occurred. HTTP error code ' + ajaxConnection.status.toString() + 'yoko.');
            return; // exit
        }
    } // end if

我想动态更改的变量位于 PHP 文件中:

session_start();
$course = $_GET['course'];

请,任何帮助将不胜感激。:-)

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