Ajax functions

gistfile1.txt

/* Start Ajax */
let getHttpRequest = function () {
    let httpRequest = false;

    httpRequest = new XMLHttpRequest();

    if (!httpRequest) {
        alert('Abandon :( Impossible de créer une instance XMLHTTP');
        return false;
    }
    return httpRequest
}
let AjaxPOST = function (form, url) {
    return new Promise(function (resolve, reject) {
        let httpRequest = getHttpRequest()
        httpRequest.onload = function () {
            if (httpRequest.status === 200) {
            // document.querySelector('#result').innerHTML = httpRequest.responseText
            resolve(httpRequest.responseText)
        } else {
            reject(new Error());
        }
        }
        httpRequest.onerror = function () {
            if (httpRequest.status === 200)
                reject(new Error('Error'))

        }

        httpRequest.open('POST', url, true)
        let data = new FormData(form)

        httpRequest.send(data)
    })
}
let AjaxGET = function (url) {
    var ajax
    let httpRequest = getHttpRequest()
    httpRequest.onload = function () 
    {
        if (httpRequest.status === 200) 
        {
        // document.querySelector('#result').innerHTML = httpRequest.responseText
        ajax = JSON.parse(httpRequest.responseText) 
        } 
        else 
        {
        ajax = new Error();
        }
    }
    httpRequest.onerror = function () 
    {
        if (httpRequest.status === 200)
            ajax = new Error('Error')

    }

    httpRequest.open('GET', url, false)

    httpRequest.send()
    return ajax
}
let AjaxDELETE = function (url) {
    return new Promise(function (resolve, reject) {
        let httpRequest = getHttpRequest()
        httpRequest.onload = function () {
            if (httpRequest.status === 200) {
                // document.querySelector('#result').innerHTML = httpRequest.responseText
                resolve(httpRequest.responseText)
            } else {
                reject(new Error());
            }
        }
        httpRequest.onerror = function () {
            if (httpRequest.status === 200)
                reject(new Error('Error'))

        }

        httpRequest.open('DELETE', url, true)
        httpRequest.send()
    })
}
/* End Ajax */