Finding specific elements

gistfile1.txt

/*IE8+*/

function findElem(elem, va, arg, str){	

    var el = document.getElementsByTagName(elem),
    len = el.length;
	
    while (len--) {
	
        // document.body["getAttribute"].call(elementToUseInstead, arg1, arg2, arg3)
        // document.body["getAttribute"].apply(elementToUseInstead, [arg1, arg2, arg3])
        if (document.body[va].call(el[len], arg) === str) {
            return el[len];
        }

    }
};

//Demo
findElem('type of element', 'method', 'attribute', 'value');
			
// Real world use
findElem('form', 'getAttribute', 'data-target', 'value')