当前使用ajax的时间不起作用

current time using ajax not working

本文关键字:时间 不起作用 ajax      更新时间:2023-09-26

我正在尝试在我的网页上实现一个动态的当前时间,显示小时、分钟和秒。我正在使用Ajax,但这似乎不起作用。

此外,我正在使用Symfony框架。

在身体里,我得了

<body onload="showCurrentTime()">

在此之前:

<script type="text/javascript" src="/js/curr_time.js"></script>

curr_time.js

//Once the document is loaded, execute the showCurrentTIme function
//This is the AJAX function that displays the current time on the screen.
$(document).ready(function(){ showCurrentTime(); });    
function showCurrentTime() {
    //Call the current time web service,
    //grab the time off the server, and apply it to the 
    //end-user client after waiting for the document to load
    $(document).ready(function() {
        //Make the call to the XML web service
        $.get("currentDateTime.php", function(currentDateTime) {
            //Format the time returned by the server
            var time = [ $("hour", currentDateTime).text(), 
            ":", 
            $("min", currentDateTime).text() ];
            //Determine how many milliseconds to will wait until 
            //the time needs to be refreshed again
            var refresh = [(60 - $("sec", currentDateTime).text()) * 1000 ];
            //Display the time on the end-user client
            $("#currentTime").html(time.join(''));
            //Set a timer so that the time on the end-user client updates 
            // in sync with the server time to display the true current time
            setTimeout('showCurrentTime()', refresh);
        });
    });
}

在同一个文件夹中,我有一个PHP文件currentDateTime.PHP

<?php
#Need to specify that this is an XML document in order for it to work with AJAX
header('Content-Type: text/xml');
#Set variables equal to each part of the date and time
$year = date("Y"); 
$mon = date("m");
$mday = date("d");
$hour = date("H");
$min = date("i");
$sec = date("s");
#Create the XML document of the current date and time
echo '<?xml version="1.0" encoding="UTF-8"?>' . "'n";
echo '<currentDateTime>' . "'n";
echo "'t" . '<year>' . $year . '</year>' . "'n";
echo "'t" . '<month>' . $mon . '</month>' . "'n";
echo "'t" . '<day>' . $mday . '</day>' . "'n";
echo "'t" . '<hour>' . $hour . '</hour>' . "'n";
echo "'t" . '<min>' . $min . '</min>' . "'n";
echo "'t" . '<sec>' . $sec . '</sec>' . "'n";
echo '</currentDateTime>' . "'n";
?>

在体内,

<p id="currentTime">--:--</p>

很长一段时间以来,我一直在努力寻找错误,但没有成功。。。

发布的showCurrentTime()函数只做一件事:设置$(document).ready()处理程序。您想从文档就绪(您已经在做了)中调用它,而不是在函数中设置另一个处理程序。只需从函数内部清除多余的$(document).ready()内容,如下所示:

function showCurrentTime() {
   $(document).ready(function() {  // DELETE THIS LINE
       //Make the call to the XML web service
       $.get("currentDateTime.php", function(currentDateTime) {
           // rest of your function goes here...
       });
   });  // DELETE THIS LINE
} 

我确信这是主要问题。

第二个问题是,当您创建refresh变量时,您要将其分配给一个具有一个元素的数组,而不是一个数字。拆下方括号。

此外,在JS文件中有这一行:

$(document).ready(function(){ showCurrentTime(); });

HTML中加载的正文:

<body onload="showCurrentTime()">

是多余的。选择一个(最好是JS文件中的那个)。