Question

document.all["" + object.getAttribute("EndDate", true) + ""].value;

does work in firefox but work in IE.

what is the alternative way other than the code above to work in multiple browsers?

Answer 1

If you want to get the element by it’s id use this form:

document.getElementById("elemen_id");

document.all isn’t cross browser.

If you want to get an element’s attribute use:

element.getAttribute("EndDate"); 

you don’t need the .value property for that.
The second parameter of getAttribute is not a boolean, rather an integer, and is only used in rare cases (like getting an element’s href in IE). If you want case-sensitivity use 1, but true here is a bit confusing of what you want to do.