Refresh php embedded in html [duplicate] - php

Question

What i want to do is, to show a message based on certain condition.
So, i will read the database after a given time continuously, and accordingly, show the message to the user.
But i want the message, to be updated only on a part of the page(lets say a DIV).
Any help would be appreciated !
Thanks !

Answer 1

This is possible using setInterval() and jQuery.load()
The below example will refresh a div with ID result with the content of another file every 5 seconds:
setInterval(function(){
$('#result').load('test.html');
}, 5000);

Answer 2

You need a ajax solution if you want to load data from your database and show it on your currently loaded page without page loading.
<script type="text/javascript" language="javascript" src=" JQUERY LIBRARY FILE PATH"></script>
<script type="text/javascript" language="javascript">
var init;
$(document).ready(function(){
init = window.setInterval('call()',5000);// 5000 is milisecond
});
function call(){
$.ajax({
url:'your server file name',
type:'post',
dataType:'html',
success:function(msg){
$('div#xyz').html(msg);// #xyz id of your div in which you want place result
},
error:function(){
alert('Error in loading...');
}
});
}
</script>

Answer 3

You can use setInterval if you want to make the request for content periodically and update the contents of your DIV with the AJAX response e.g.
setInterval(makeRequestAndPopulateDiv, "5000"); // 5 seconds
The setInterval() method will continue calling the function until clearInterval() is called.
If you are using a JS library you can update the DIV very easily e.g. in Prototype you can use replace on your div e.g.
$('yourDiv').replace('your new content');

Answer 4

I'm not suggesting that my method is the best, but what I generally do to deal with dynamic stuff that needs access to the database is the following method :
1- A server-side script that gets a message according to a given context, let's call it "contextmsg.php".
<?php
$ctx = intval($_POST["ctx"]);
$msg = getMessageFromDatabase($ctx); // get the message according to $ctx number
echo $msg;
?>
2- in your client-side page, with jquery :
var DIV_ID = "div-message";
var INTERVAL_IN_SECONDS = 5;
setInterval(function() {
updateMessage(currentContext)
}, INTERVAL_IN_SECONDS*1000);
function updateMessage(ctx) {
_e(DIV_ID).innerHTML = getMessage(ctx);
}
function getMessage(ctx) {
var msg = null;
$.ajax({
type: "post",
url: "contextmsg.php",
data: {
"ctx": ctx
},
success: function(data) {
msg = data.responseText;
},
dataType: "json"
});
return msg;
}
function _e(id) {
return document.getElementById(id);
}
Hope this helps :)