加載網頁時,我得到這個錯誤:錯誤使用下拉菜單(HTML)當選擇MySQL查詢
注意:未定義指數:bandselection在 /public/sites/www.transport-dealer.com /commercialequipmentfinder/index.php 上線203
說明:未定義指數:bandselection2在 /public/sites/www.transport-dealer.com/commercialequipmentfinder/index.php 線204上
當我按下提交,它會顯示正確的數據,反正是有,以確保已被過濾,並顯示在表格的「seleccted」部分數據
HTML:
<form method="post" action="index.php">
<label>
<select name="bandselection" id="bandselection">
<option value="1990" selected="selected">1990</option>
<option value="2006">2006</option>
<option value="2005">2005</option>
<option value="2004">2004</option>
</select>
<select name="bandselection2" id="bandselection2">
<option value="2015" selected="selected">2015</option>
<option value="2006">2006</option>
<option value="2005">2005</option>
<option value="2004">2004</option>
</select>
</label>
<label>
<input type="submit" name="Submit" value="Submit" />
</label>
</form>
PHP:
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$bandselection = $_POST['bandselection'];
$bandselection2 = $_POST['bandselection2'];
$sql = "SELECT ID, link, link_image, modelyear, brand, city, price, description, country, type FROM semi_trailer_curtainsider WHERE modelyear BETWEEN '" . $bandselection ."' AND '" . $bandselection2 ."' AND brand = 'Samro'";
在初始頁面加載你的'$ _POST'變量沒有設置,這會導致問題。將該節置於'if(isset($ _ POST ['bandselection'])){...}'來防止警告。 – Sean
嗨,非常感謝:)這真的很有幫助,很抱歉,我無法找到其他相同的帖子。我不知道如何正確地說出這個問題 –