Question

我想问。如何在单击刷新按钮后再次启动计时器？这是我的代码：

session_start();
$result2 = mysql_query("SELECT * FROM test WHERE testNum='$testnum'");
$rec2 = mysql_fetch_array($result2);

<script language="JavaScript">
var hoursleft = <?php echo $rec2['testDurationHour'];?>;
var minutesleft = <?php echo $rec2['testDurationMin'];?>; 
var secondsleft = 0;

end = new Date();
end.setMinutes(end.getMinutes()+minutesleft);
end.setSeconds(end.getSeconds()+secondsleft);

function cd(){
now = new Date();
diff = end - now;
diff = new Date(diff);
var sec = diff.getSeconds();
var min = diff.getMinutes();
var hr = diff.getHours()-1;

if (min < 10){ 
min = "0" + min;
}
if (sec < 10){
sec = "0" + sec;
}
if(now >= end){
window.alert("Time is up. Press OK to continue."); 
document.forms[0].submit();
}
else
{
document.getElementById("cdtime").innerHTML =  min + ":" + sec;
setTimeout("cd()", 10); 
}
}
window.onload = cd;

如何在用户点击刷新按钮后再次启动计时器？

Answer 1

我知道这是一个快速而肮脏的答案。但我认为这已经足够了。

您可以使用会话检查正在进行的测试编号，因此每当测试页面刷新相同的测试编号时，剩余的小时和分钟设置为0（这将阻止您的时间重新开始），如果没有（您的测试页面未刷新）您可以使用数据库中的必要值填充它。注意：我对其他代码使用“added”，在我对代码进行一些修改时使用“modified”。见下文。

session_start();

// added
$hoursLeft = 0;
$minutesLeft = 0;

$result2 = mysql_query("SELECT * FROM test WHERE testNum='$testnum'");
$rec2 = mysql_fetch_array($result2);

// added
if(!isset($_SESSION['testnum']) || $_SESSION['testnum'] <> $testnum) { 
    $_SESSION['testnum'] = $testnum;
    $hoursLeft = $rec2['testDurationHour'];
    $minutesLeft = $rec2['testDurationMin'];
} else {
    $msg = "It seems you've been refreshing your page and it's prohibited. Press OK to continue";
}

<script language="JavaScript">
// modified
var hoursleft = <?php echo $hoursLeft ?>;

// modified
var minutesleft = <?php echo $minutesLeft ?>; 
var secondsleft = 0;

end = new Date();
end.setMinutes(end.getMinutes()+minutesleft);
end.setSeconds(end.getSeconds()+secondsleft);

function cd(){
    now = new Date();
    diff = end - now;
    diff = new Date(diff);
    var sec = diff.getSeconds();
    var min = diff.getMinutes();
    var hr = diff.getHours()-1;

    if (min < 10) { 
        min = "0" + min;
    }
    if (sec < 10) {
        sec = "0" + sec;
    }
    if(now >= end) {
        // modified
        var msg = <?php if (isset($msg)) echo '"'.$msg.'"'; else echo '"'."Time is up. Press OK to continue.".'"'; ?>;
        window.alert(msg); 
        document.forms[0].submit();
    }
    else {
        document.getElementById("cdtime").innerHTML =  min + ":" + sec;
        setTimeout("cd()", 10); 
    }
}
window.onload = cd;

如何在点击刷新按钮后再次启动计时器？

1 个答案: