Question

当我的计时器计数为00:00:00时 alert('Get Result')按钮或提交表单

我甚至无法在response.php中发出警报消息。

这是我从数据库中选择持续时间的地方

while($row=mysqli_fetch_array($res))
{
    $duration=$row["duration"];
}

$_SESSION["duration"]=$duration;
$_SESSION["start_time"]=date("Y-m-d H:i:s");

$end_time=$end_time=date('Y-m-d H:i:s', strtotime('+'.$_SESSION["duration"].'minutes',strtotime($_SESSION["start_time"])));

$_SESSION["end_time"]=$end_time;

这是response.php

<?php
session_start();

$from_time1=date('Y-m-d H:i:s');
$to_time1=$_SESSION["end_time"];
$timefirst=strtotime($from_time1);
$timesecond=strtotime($to_time1);

$differenceinseconds=$timesecond-$timefirst;
if($differenceinseconds<0){
    // This is for when timer smaller then 0 then = 00:00:00
    $differenceinseconds=0;
    echo "TIME UP<br>";
//I try to alert a simple message here, and dint work. Why is this happen
}
echo gmdate("H:i:s",$differenceinseconds);

?>

这是测验页面中的javascript

<script type="text/javascript">
    var x =setInterval(test,1000);

    function test()
    {
        var xmlhttp=new XMLHttpRequest();
        xmlhttp.open("GET","response.php",false);
        xmlhttp.send(null);
        document.getElementById("response").innerHTML=xmlhttp.responseText;
    }
</script>

显示计时器标签

<div id=response class=timer style=font-size:30px></div>

表单名称和按钮

<form name=myfm method=post action=quizz.php>
    <input type=submit name=submit value='Get Result'>

Answer 1

您的PHP应该只获得时间上的差异。这意味着PHP将始终输出HH:mm:ss的格式，而不会输出其他文本或值，您可以在JavaScript中获得该格式。除非使用编码数组，否则确保输出始终相同，这意味着您可以设计代码以期望始终发送的值。

$differenceinseconds = $timesecond - $timefirst;
if ($differenceinseconds < 0){
    $differenceinseconds = 0;
}
echo gmdate("H:i:s", $differenceinseconds);

您可以在JavaScript中获取值之后再检查该值，因为您现在知道response.php所打印的唯一内容就是时间，格式为HH:mm:sss。

function test() {
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.open("GET", "response.php", false);
    xmlhttp.send(null);
    var response = xmlhttp.responseText;

    document.getElementById("response").innerHTML = response;
    if (response == "00:00:00") {
        alert("Time's up!");
    }
}

如果您也要提交表单，请在条件submit()内添加if (response == "00:00:00") {。

document.getElementsByName('myfm')[0].submit();

当倒数计时器= 0时，提醒按钮或提交表单

1 个答案: