server/core/js/maintenance-check.js

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JavaScript
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// Check every 20 seconds via status.php if maintenance is over
window.setInterval(checkStatus, 20000);
function checkStatus() {
var request = new XMLHttpRequest();
var ocroot = location.pathname.substr(
0, location.pathname.indexOf('index.php')
);
request.open("GET", ocroot+'status.php', true);
request.send();
request.onreadystatechange = function() {
if (request.readyState === 4) {
var response = request.responseText;
var responseobj = JSON.parse(response);
if (responseobj.maintenance === 'false') {
window.location.reload();
}
}
};
}