Question 41388 in PHP Question posted in
Official manual can be found here.

Can I read a txt file every few seconds and display its contents through html? – PHP

I have a txt file that updates with new data every few seconds. It is stored and generated locally on a raspberry pi, which will also act as the server.

I want its contents to be added to and html code for displaying.

It should update without manual reloading of the page.

Is there a way to do this? Maybe with AJAX, PHP, or something along those lines?

Don’t have to find/write any code for me, as I understand that it would be rather time consuming. just point me in the right direction so I can learn how to do it.

Tags:

2

Answers


  1. 0

    You could do this using an API endpoint and an ajax call on the client.
    I sketched up some code for you.
    I made the endpoint url /url/to/api.php – you would change this to match the server setup on the pi.

    You would also need to host a HTML file that has some javascript code that polls your api every few seconds. I set it to do this every 5th second, using setInterval.

    <script>
// The client code (javascript) - should be placed right before the </body> tag
(async () => {
    setInterval(async () => {
        const data = await fetch("/url/to/api.php").then(response => response.text());
        document.getElementById("#htmlElementWithThisId").innerHTML(data);
    }, 5000);
})()
</script>

// In the html you have to have an element with the id: "htmlElementWithThisId" - this is where the content will be displayed

<div id="htmlElementWithThisId"></div>

    Finally in the api.php file you would read your file and "echo" the contents of your file on every request

    Login or Signup to reply.
  2. 0

    you can use jQuery,$.ajax ,$.post or $.get

    or can also use XMLHttpRequest for javascript (old but gold)

    and for php use readFile (server-side no need for API)

    little story may help

    once i used arduino with wifi module

    i collected the data using the arduino, after that i passed it to esp8266 (the wifi modle) and i posted to my site using GET methode
    like
    http://mySite.lo/?firstVar=myFirstVar&secondVar=mySecondVar
    and the server took the GET data from the URL

    update:
    the refresh of page

    for php it’s header("refresh: 3;")

    for js write setInterval(location.reload(),3000)

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search