Javascript 包含文件并每 30 秒刷新一次

Question

I have 3 files i refer to them as:

     $nowplaying = file_get_contents("/api/static/nowplaying");
$dj = file_get_contents("/api/static/dj");
$listeners = file_get_contents("/api/static/listeners");

I want to call them in my php file inside div tags by using

'.$dj.'
'.$nowplaying.'
'.$listeners.'

but the contents of the files i am pulling update every 30 seconds so I need to refresh the data shown without refreshing the page. I'm thinking javascript jquery may be the one but i'm not too familiar with it.

Many thanks!

Answer 1

If you have jQuery

setInterval(function(){
    $.get("/api/static/nowplaying",function(data){
        // Do something with data
    });
},30000);

with javascript kinda like

var request = new XMLHttpRequest();
setInterval(function(){
    request.open('GET', '/api/static/nowplaying', true);
    request.send();
},30000)

request.onload = function() {
    if (request.status >= 200 && request.status < 400) {
        // Success!
        var data = request.responseText;
    } else {
    // We reached our target server, but it returned an error

   }
};

Answer 2

Yes, I think using jquery/JavaScript is what you are looking for and its pretty simple. Just use the setInterval() method in JavaScript to have it repeatedly run a function on a schedule. Since you're rather new to this I'll try to make a simple example. The code below runs updateDiv() every 30 seconds.

<script type="text/javascript" src="//code.jquery.com/jquery-3.1.1.js">
</script>
  <script type='text/javascript'>

var myVar
function updateDiv(){
    clearInterval(myVar);

    alert('your code should go here');

    myVar = setInterval("updateDiv()", 30000);
}
$(document).ready(function(){
    myVar = setInterval("updateDiv()", 30000);
}); 

You can view this here: https://jsfiddle.net/jglazer63/h6q20dj9/1/