Get all Attributes from a HTML element with Javascript/jQuery

If you just want the DOM attributes, it’s probably simpler to use the attributes node list on the element itself:

var el = document.getElementById("someId");
for (var i = 0, atts = el.attributes, n = atts.length, arr = []; i < n; i++){
    arr.push(atts[i].nodeName);
}

Note that this fills the array only with attribute names. If you need the attribute value, you can use the nodeValue property:

var nodes=[], values=[];
for (var att, i = 0, atts = el.attributes, n = atts.length; i < n; i++){
    att = atts[i];
    nodes.push(att.nodeName);
    values.push(att.nodeValue);
}