how to load data without page refresh using ajax - php

Question

Here is my code for loading data
$(document).ready(function() {
$.get('get-answers.php', {
project_question_id: <?=$project_question_id?>,
project_id: <?=$project_id?>
}, function(data) {
$('#dispaly-answers').append(data);
});
});
This code retrieves data from database and working fine. But problem here is that if I add new data on the database, this data doesn't show up without page refresh.
So I don’t want to refresh the page to get the data. It should be displayed once new data added to database.
Any suggestions on this issue?
P.S : I also tried .ajax(), didn’t work.
Here is my $.ajax() request
$(document).ready(function() {
$.ajax( {
type: "GET",
url: "get-answers.php",
data: { project_question_id: <?=$project_question_id?>,
project_id: <?=$project_id?>
},
cache: false,
success: function(data) {
$('#dispaly-answers').append(data);
},// success
})// ajax
});
Does the same as $.get()

Answer 1

If your goal is to refresh the page data without refreshing the page, you can put your code in an interval timer and let it auto refresh every x seconds, like below.
setInterval(getAnswer(), 1000);
note: setInterval fires again and again until you clear it, while setTimeout only fires once.

Answer 2

The Ajax-Function get only called once: In the moment the document is ready (fully loaded). You have to use setTimeout to create a timer, which calls the function every minute or whatever you want. Like this:
function getData() {
setTimeout(function(){
$.get('get-answers.php', {
project_question_id: <?=$project_question_id?>,
project_id: <?=$project_id?>
}, function(data) {
$('#dispaly-answers').append(data);
getData();
});
}, 3000);
}

Answer 3

Here is my final approach
$(document).ready(function() {
setInterval(function(){
$.ajax( {
type: "GET",
url: "get-answers.php",
data: { project_question_id: <?=$project_question_id?>,
project_id: <?=$project_id?>
},
cache: false,
success: function(data) {
$('#dispaly-answers').html(data);
},// success
})// ajax
}, 1000);
});
Without creating and calling function getData(), this code working fine. Also I have changed .append(data) to .html(data).
But still I'm not happy with my code because it is constantly retrieving data from database that makes data server busy.
Whatever I wanted to tasks has to be done and it is done.

Answer 4

Try this you just need to replace this file retrieve_query.php and this id query-div with yours.
setInterval(function(){
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
$('#query-div').html(this.responseText);
}
};
xmlhttp.open("GET","retrieve_query.php",true);
xmlhttp.send();
},1000);