dongtiao5094 2016-10-10 20:13
浏览 83
已采纳

如何在PHP中回显更新变量

Thanks for coming to try and help me solve my problem!

My problem is, I would like the display a variable on my page using PHP. This variable updates every second or so. I would like this to update on the page as the variable changes. I tried using a while loop but this just continuously prints the variable. I will warn you, I am not very PHP savvy, and you're probably going to have to explain your answer to me, A LOT. Sorry I didn't include any code samples.. I didn't really think it was needed for this question. If you would like me to provide some samples, I will though. Thanks for considering answering my question! :)

  • 写回答

2条回答 默认 最新

  • doucheng5209 2016-10-10 20:30
    关注

    You try to do something which is not so easy to implement with the basics of PHP. PHP is once generated on the server side and then gives the result to the client. (your browser). If you like to change the HTML Code dynamically you should take a look at JavaScript. This will allow you to make dynamic updates without reloading the page. (e.g. a user presses a button or a timer in your case):

    var i = 1;

// update site content every second
setInterval(function() {

  // get div with id example
  var myElement = document.getElementById('example');

  // count up by 1
  i++;

  // update content
  myElement.innerHTML = 'Zahl ' + i;

}, 1000);
    <html>

<head>
  <meta charset="UTF-8">
  <title>JavaScript test</title>
</head>

<body>
  <div id="example">Zahl 1</div>
</body>

</html>

    Now if you would like to run a PHP Script every second you need something else which is called AJAX. So for example if you would like to run hello.php every one second and set the result of it to the same div from before you need this code:

    var i = 1;

// update site content every second
setInterval(function() {

  // run function loadDoc every second
  loadDoc();

}, 1000);

function loadDoc() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    // get div with id example and update HTML
    document.getElementById("example").innerHTML = this.responseText;
  };
  xhttp.open("GET", "hello.php", true);
  xhttp.send();
}
    <html>

<head>
  <meta charset="UTF-8">
  <title>JavaScript test</title>
</head>

<body>
  <div id="example">Zahl 1</div>
</body>

</html>

    </div>
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)

报告相同问题？

悬赏问题

  • ¥15 网络科学导论，网络控制
  • ¥100 安卓tv程序连接SQLSERVER2008问题
  • ¥15 利用Sentinel-2和Landsat8做一个水库的长时序NDVI的对比，为什么Snetinel-2计算的结果最小值特别小，而Lansat8就很平均
  • ¥15 metadata提取的PDF元数据，如何转换为一个Excel
  • ¥15 关于arduino编程toCharArray()函数的使用
  • ¥100 vc++混合CEF采用CLR方式编译报错
  • ¥15 coze 的插件输入飞书多维表格 app_token 后一直显示错误，如何解决？
  • ¥15 vite+vue3+plyr播放本地public文件夹下视频无法加载
  • ¥15 c#逐行读取txt文本，但是每一行里面数据之间空格数量不同
  • ¥50 如何openEuler 22.03上安装配置drbd