Question

我需要根据用户的第一个下拉选项填充下拉列表，但在我到达目前为止，我只是尝试使用预选的团队填充一个，以确保我首先获得该部分。但是使用这个代码，我得到了我的第一个团队名称下拉列表，但接下来是一个空文本字段，我似乎无法显示和填充第二个下拉列表。我是html和php的新手，我很确定我错过了一些简单的东西。非常感谢任何帮助，如果我能更清楚地了解我的问题，请告诉我。感谢。

<!DOCTYPE html>
<html>
<head><style>
</style></head>
<body>
<form>
<select name="teams">
                    <option value="Atlanta Hawks ">Atlanta Hawks</option>
                    <option value="Boston Celtics ">Boston Celtics</option>
                    <option value="Charlotte Bobcats ">Charlotte Bobcats</option>
                    <option value="Chicago Bulls ">Chicago Bulls</option>
                    <option value="Cleveland Cavaliers ">Cleveland Cavaliers</option>
                    <option value="Dallas Mavericks ">Dallas Mavericks</option>
                    <option value="Denver Nuggets">Denver Nuggets</option>
                    <option value="Detroit Pistons ">Detroit Pistons</option>
                    <option value="Golden State Warriors">Golden State Warriors</option>
                    <option value="Houston Rockets ">Houston Rockets </option>
                    <option value="Indiana Pacers ">Indiana Pacers </option>
                    <option value="LA Clippers ">LA Clippers</option>
                    <option value="LA Lakers ">LA Lakers</option>
                    <option value="Memphis Grizzlies ">Memphis Grizzlies</option>
                    <option value="Miami Heat">Miami Heat</option>
                    <option value="Milwaukee Bucks ">Milwaukee Bucks</option>
                    <option value="Minnesota Timberwolves ">Minnesota Timberwolves</option>
                    <option value="New Jersey Nets">New Jersey Nets</option>
                    <option value="New Orleans Hornets ">New Orleans Hornets</option>
                    <option value="New York Knicks ">New York Knicks</option>
                    <option value="Oklahoma City Thunder ">Oklahoma City Thunder</option>
                    <option value="Orlando Magic ">Orlando Magic</option>
                    <option value="Philadelphia Sixers ">Philadelphia Sixers </option>
                    <option value="Phoenix Suns ">Phoenix Suns</option>
                    <option value="Portland Trail Blazers ">Portland Trail Blazers</option>
                    <option value="Sacramento Kings ">Sacramento Kings</option>
                    <option value="San Antonio Spurs ">San Antonio Spurs</option>
                    <option value="Toronto Raptors ">Toronto Raptors</option>
                    <option value="Utah Jazz">Utah Jazz</option>
                    <option value="Washington Wizards ">Washington Wizards</option>


</select>
<input type="text" name="team">
<?php

$con=mysqli_connect("localhost","nbastakm_josh","ateam","nbastakm_Stats"); 
if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql = "SELECT fname, lname FROM PlayerRegSeason WHERE team='NYK' and year='2009'";

$result = mysqli_query($con,$sql);
if (!$result) {
    printf("Error: %s\n", mysqli_error($con));
    exit();
}
$playermenu = "
<p><label>Players</label></p>
<select name='players' id='players'>";

while($row=mysqli_fetch_array($result)){
$playermenu = "<option>".$row['lname']."</option>";
}
$playermenu = "</select>";
echo $playermenu;
mysqli_close($con);

?>

</form>


</body>
</html>

Answer 1

使用点来连接字符串：

while($row=mysqli_fetch_array($result)){
  $playermenu .= "<option>".$row['lname']."</option>";
}
$playermenu .= "</select>";

Answer 2

无法重新发送到服务器，无法使用客户端选项。你需要：

AJAX，
第二页（向导中的第2步）你可以检查＆＃34;团队＆＃34;或
您可以在更换团队后使用javascript重新加载页面

试图从php中的sql查询填充下拉框

2 个答案: