x-http-client/lib/http/addTimeoutListener.js

An http client to simplify sending requests (HTTP & JSONP) in the browser.

/**
 * Add timeout event listener on the XHR object.
 *
 * @param {XMLHttpRequest} xhr The XHR to add timeout event listener.
 * @param {number} timeout The time to wait in milliseconds.
 * @param {() => void} listener The timeout callback.
 * @returns {() => void)} Returns a function to remove the timeout event listener.
 */
function addTimeoutListener(xhr, timeout, listener) {
    var timeoutId = null;
    var supportTimeout = 'timeout' in xhr && 'ontimeout' in xhr;

    if (supportTimeout) {
        xhr.timeout = timeout;
        xhr.ontimeout = listener;
    } else {
        timeoutId = setTimeout(listener, timeout);
    }

    // Call this function to remove timeout event listener
    function clearTimeoutEvent() {
        if (xhr) {
            if (timeoutId === null) {
                xhr.ontimeout = null;
            } else {
                clearTimeout(timeoutId);
            }
            xhr = null;
            listener = null;
        }
    }

    return clearTimeoutEvent;
}

module.exports = addTimeoutListener;