我已尝试在stackoverflow中找到解决我问题的解决方案，但其中没有一个与我的问题相符。
我的问题是;
我if statement里面javascript if statement内有if statement弹出窗口。我希望我的javascript仅在if statement符合条件时显示弹出窗口1次。我尝试在<?php
if(isset($_POST['submit'])){
$reserve_stime = htmlentities($_POST['starttime']);
$reserve_etime = htmlentities($_POST['endtime']);
$reservedstime = "SELECT startmeetingtime, endmeetingtime
FROM meeting_room_reservation
WHERE room_reserve_session = '$varsession'
AND room_reserve_date = '$convardate'
AND room_id = $idroom";
$result7=mysql_query($reservedstime) or die("invalid query:".mysql_error());
while($row7=mysql_fetch_assoc(@$result7)){
$reservedstime2 = "SELECT timereserve_start_id
FROM timereserve_start
WHERE timereserve_start_id BETWEEN " . $row7['startmeetingtime'] . " AND " . $row7['endmeetingtime'] . "";
$result8=mysql_query($reservedstime2) or die("invalid query:".mysql_error());
while ($row8=mysql_fetch_assoc(@$result8)) {
$timealreadyreserved = $row8['timereserve_start_id'];
echo "<script type='text/javascript'>
for (i=$reserve_stime; i <= $reserve_etime ; i++){
if (i == $timealreadyreserved){
alert('Time is not Available');
break;
}
else{
//do nothing
}
}
</script>";
}
}
}
?>
内使用break，但它仍会显示一段时间的弹出窗口。
代码：
for我的朋友说，问题出现在do循环之前while break循环，这就是为什么弹出窗口仍会显示几次甚至已经放置{{1} } if statement
任何想法？ 谢谢， faizal
答案 0 :(得分：1)
您可以使用布尔变量（如$flag）来检查条件是否已满足，然后突破循环，如下所示：
// your code
while($row7=mysql_fetch_assoc(@$result7)){
$reservedstime2 = "SELECT timereserve_start_id
FROM timereserve_start
WHERE timereserve_start_id BETWEEN " . $row7['startmeetingtime'] . " AND " . $row7['endmeetingtime'] . "";
$result8=mysql_query($reservedstime2) or die("invalid query:".mysql_error());
$flag = false;
while($row8=mysql_fetch_assoc(@$result8)) {
$timealreadyreserved = $row8['timereserve_start_id'];
for ($i=$reserve_stime; $i <= $reserve_etime ; $i++){
if($i == $timealreadyreserved){
$flag = true;
?>
<script>alert("Time is not Available");</script>
<?php
break;
}
}
if($flag){
break;
}
}
if($flag){
break;
}
}
// your code
警告：不要在代码中混用javascript和php，就像在内部for循环中一样。
旁注：不要使用mysql_数据库扩展，它们在PHP 5.5.0中已弃用，并已在PHP 7.0.0中删除。请改用mysqli或PDO扩展程序。这是why you shouldn't use mysql_ functions。