Internet Explorer issue with HTML5 form attribute for button element

Question

in HTML5, there is the form attribute. Basically

Answer 1

If you send form via ajax and use vanilla js, you can add inputs with "form" attribute like below:

function sendViaAjax(event, callback) {
    event.preventDefault();
    var form = event.target;
    var formId = form.id;
    var url = form.getAttribute('action');
    var method = form.getAttribute('method');
    var data = new FormData(form);
    if(isInternetExplorer() && formId) {
        var formInputs = document.querySelectorAll('input[form="'+formId+'"], textarea[form="'+formId+'"], select[form="'+formId+'"]');
        [].forEach.call(formInputs, function (el) {
            var inputName = el.getAttribute('name');
            data.append(inputName, el.value);
        });
    }
    var xhr = new XMLHttpRequest();
    xhr.open(method, url);
    xhr.onload = function () {
        // something
    };
    xhr.onerror = function () {
       // something
    };
    xhr.send(data);
}

function isInternetExplorer() {
    return (navigator.appName == 'Microsoft Internet Explorer' ||
        !!(navigator.userAgent.match(/Trident/) ||
            navigator.userAgent.match(/rv:11/)) ||
        (typeof $.browser !== "undefined" && $.browser.msie == 1));
}