common/ajax.js


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/**
 * part of Hachette
 * Wrapping XMLHttpRequest into a Promise.
 *
 * Copyright (C) 2021 Wojtek Kosior
 * Redistribution terms are gathered in the `copyright' file.
 */

function ajax_callback()
{
    if (this.readyState == 4)
	this.resolve_callback(this);
}

function initiate_ajax_request(resolve, reject, method, url)
{
    const xhttp = new XMLHttpRequest();
    xhttp.resolve_callback = resolve;
    xhttp.onreadystatechange = ajax_callback;
    xhttp.open(method, url, true);
    try {
	xhttp.send();
    } catch(e) {
	console.log(e);
	setTimeout(reject, 0);
    }
}

function make_ajax_request(method, url)
{
    return new Promise((resolve, reject) =>
		       initiate_ajax_request(resolve, reject, method, url));
}

/*
 * EXPORTS_START
 * EXPORT make_ajax_request
 * EXPORTS_END
 */