javascript - 使用 PHP MySQL 和 Java 进行动态下拉

Question

使用 mysql 插入查询在 PHP MySQL 和 AJAX 中完成动态下拉完美运行。

向MySQL表插入日期的代码

<?php
require('../conn/include.php');
require('quick.php');
$query="SELECT * FROM category";
$result=mysql_query($query);
$project=$_POST['project'];
$alttext=$_POST['alttext'];
$relation=$_POST['state'];;

if(isset($_FILES['image'])) {
    $errors=array();
    $allowed_ext=array('jpg','png','jpeg','JPG');
    $filename=$_FILES['image']['name'];
    $name=stripslashes($filename);
    $type=strtolower(end(explode('.',$filename)));
    $size=$_FILES['image']['size'];
    $file_tmp=$_FILES['image']['tmp_name'];

if(in_array($type,$allowed_ext) ===false) {
    $errors[]= "<span class=\"notification n-error\">Extenstion Not Allowed</span>";
}
if($size > 1048576) {
    $errors[]= "<span class=\"notification n-error\">File must be less then 2mb</span>";
}if(file_exists('../../images/a/gallery/'.$filename)) {
   $errors[]= "<span class=\"notification n-error\">File $filname Already Exists in directory</span>";

}if(empty($errors)) {
    if(move_uploaded_file($file_tmp, '../../images/a/gallery/'.$filename)) {
        $insert="Insert into `my`.gallery(name,alttext,project,relation)VALUE('$name','$alttext','$project','$relation')";
        //echo $insert;
        $que=mysql_query($insert);
    echo "<span class=\"notification n-success\">File $filname Uploaded Sucessfully</span>";
    header('Refresh:3; url:gallery.php');
    }
}else {
    foreach($errors as $error) {
        echo $error,'<br/>';    
    }
}
}

?>

AJAX代码

<script language="javascript" type="text/javascript">
function getXMLHTTP() { //function to return the xml http object
var xmlhttp=false;  
try{
    xmlhttp=new XMLHttpRequest();
}
catch(e)    {       
    try{            
        xmlhttp= new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch(e){
        try{
        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch(e1){
            xmlhttp=false;
        }
    }
}

return xmlhttp;
}
function getState(cate_id) {        
var strURL="findsect.php?country="+cate_id;
var req = getXMLHTTP();
if (req) {
    req.onreadystatechange = function() {
        if (req.readyState == 4) {
            // only if "OK"
            if (req.status == 200) {                        
                document.getElementById('statediv').innerHTML=req.responseText;

            } else {
                alert("Problem while using XMLHTTP:\n" + req.statusText);
            }
        }               
    }           
    req.open("GET", strURL, true);
    req.send(null);
}       
}
</script>

第二个下拉代码或 findsec.php

<?php 
$country=$_GET['country'];
$con = mysql_connect('localhost', 'root', ''); 
if (!$con) {
    die('Could not connect: ' . mysql_error());
}
mysql_select_db('my');
$query="SELECT * FROM gallery_section WHERE related='$country'";
$result=mysql_query($query);

?>
<select name="state" onchange="getCity(<?php echo $country?>,this.value)">
<option>Select State</option>
<?php while ($row=mysql_fetch_array($result)) { ?>
<option value="<?php echo $row['title']?>"><?php echo $row['title']?></option>
<?php } ?>
</select>

感谢 Nick Wilde 的帮助。

Answer 1

我假设您的意思是第二个下拉选项的值是多个单词。如果是这种情况，问题是您缺少引号；改用这个:

<?php while ($row=mysql_fetch_array($result)) { ?>
<option value="<?php echo $row['title']?>"><?php echo $row['title']?></option>
<?php } ?>
</select>

作为你的 findsec.php 的最后三行