Alert for unsaved changes in form

Question

I want to write Jquery code in master file, so that if there if user changes page and there is any unsaved changes user should get alert. I got one answer from this: link

Answer 1

Why not simply bind the event to the change callback?

$(":input").change(function()
{
    $(window).unbind('unload').bind('unload',function()
    {
        alert('unsaved changes on the page');
    });
});

As an added bonus, you can use confirm and select the last element that triggered the change event:

$(":input").change(function()
{
    $(window).unbind('unload').bind('unload',(function(elem)
    {//elem holds reference to changed element
        return function(e)
        {//get the event object:
            e = e || window.event;
            if (confirm('unsaved changes on the page\nDo you wish to save them first?'))
            {
                elem.focus();//select element
                return false;//in jQuery this stops the event from completeing
            }
        }
    }($(this)));//passed elem here, I passed it as a jQ object, so elem.focus() works
    //pass it as , then you'll have to do $(elem).focus(); or write pure JS
});

If you have some save button, make sure that that unbinds the unload event, though:

$('#save').click(function()
{
    $(window).unbind('unload');
    //rest of your code here
});