Confirmation before closing of tab browser

Question

How to ask confirmation from user before he leaves the page as in gmail   I searched for this question in various places  but all that they mention is the use of javascript window unload  amp  window onbeforeunload  Also it doesn t work in chrome most of the times as it gets blocked

User · Answer

Simply  function goodbye e            if  e  e   window event            e cancelBubble is supported by IE - this will kill the bubbling process          e cancelBubble   true          e returnValue    You sure you want to leave      This is displayed on the dialog            e stopPropagation works in Firefox          if  e stopPropagation                e stopPropagation                e preventDefault                    window onbeforeunload goodbye

User · Answer

If you want to ask based on condition   var ask   true window onbeforeunload   function  e        if  ask  return null     e   e    window event        old browsers     if  e   e returnValue    Sure           safari  chrome chrome ignores text      return  Sure

User · Answer

I read comments on answer set as Okay  Most of the user are asking that the button and some links click should be allowed  Here one more line is added to the existing code that will work    lt script type  text javascript  gt    var hook   true    window onbeforeunload   function         if  hook           return  Did you save your stuff               function unhook         hook false         Call unhook   onClick for button and links which you want to allow  E g    lt a href     onClick  unhook    gt This link will allow navigation lt  a gt

User · Answer

Try this    lt script gt      window onbeforeunload   function e           return  Dialog text here            lt  script gt    more info here MDN

User · Answer

Try this    lt script gt  window onbeforeunload   function  e        e   e    window event          For IE and Firefox prior to version 4     if  e            e returnValue    Sure                  For Safari     return  Sure        lt  script gt    Here is a working jsFiddle

User · Answer

The shortest solution for the year 2020  for those happy people who don t need to support IE   Tested in Chrome  Firefox  Safari   function onBeforeUnload e        if  thereAreUnsavedChanges              e preventDefault            e returnValue               return             delete e  returnValue       window addEventListener  beforeunload   onBeforeUnload     Actually no one modern browser  Chrome  Firefox  Safari  displays the  return value  as a question to user  Instead they show their own confirmation text  it depends on browser   But we still need to return some  even empty  string to trigger that confirmation on Chrome   More explanations see on MDN here and here

[javascript] Confirmation before closing of tab/browser

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