javascript - 使用未提交的表单关闭页面时询问确认

Question

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Answer 1

var warn_on_unload = false; //default false 


$('input,textarea,select').on('change', function () { 
  //making true when user types in , or select
    warn_on_unload = true;
});

$(window).bind('beforeunload', function(){
//warns user if not saving form and closing or browsing other page
    if(warn_on_unload)
    {
        return confirm('Leaving this page will cause any unsaved data to be lost.');
    }

});