Detecting Back Button Hash Change in URL

Question

I just set up my new homepage at http   ritter vg   I m using jQuery  but very minimally  It loads all the pages using AJAX - I have it set up to allow bookmarking by detecting the hash in the URL        general functions  function getUrl u          return u     html       function loadURL u               get getUrl u   function r                       main   html r                               allows bookmarking  var hash   new String document location  indexOf        if hash  gt  0           page   new String document location  substring hash   1         if page length  gt  1          loadURL page         else         loadURL  news        else       loadURL  news      But I can t get the back and forward buttons to work     Is there a way to detect when the back button has been pressed  or detect when the hash changes  without using a setInterval loop   When I tried those with  2 and 1 second timeouts  it pegged my CPU

User · Accepted Answer

Use the jQuery hashchange event plugin instead  Regarding your full ajax navigation  try to have SEO friendly ajax  Otherwise your pages shown nothing in browsers with JavaScript limitations

User · Answer

I do the following  if you want to use it then paste it in some where and set your handler code in locationHashChanged qs  where commented  and then call changeHashValue hashQuery  every time you load an ajax request   Its not a quick-fix answer and there are none  so you will need to think about it and pass sensible hashQuery args  ie a 1 amp b 2  to changeHashValue hashQuery  and then cater for each combination of said args in your locationHashChanged qs  callback         Add code below     function locationHashChanged qs      var q   parseQs qs        ADD SOME CODE HERE TO LOAD YOUR PAGE ELEMS AS PER q         YOU SHOULD CATER FOR EACH hashQuery ATTRS COMBINATION       THAT IS PASSED TO changeHashValue hashQuery        CALL THIS FROM YOUR AJAX LOAD CODE EACH LOAD     function changeHashValue hashQuery      stopHashListener      hashValue       hashQuery    location hash   hashQuery    startHashListener          AND DONT WORRY ABOUT ANYTHING BELOW     function checkIfHashChanged       var hashQuery   getHashQuery      if  hashQuery    hashValue      return    hashValue   hashQuery    locationHashChanged hashQuery      function parseQs qs      var q         var pairs   qs split   amp       for  var idx in pairs        var arg   pairs idx  split           q arg 0     arg 1         return q     function startHashListener       hashListener   setInterval checkIfHashChanged  1000      function stopHashListener       if  hashListener    null      clearInterval hashListener     hashListener   null     function getHashQuery       return location hash replace               var hashListener   null  var hashValue           getHashQuery    startHashListener

User · Answer

Try simple  amp  lightweight PathJS lib   Simple example   Path map    page   to function        alert  page

User · Answer

I do the following  if you want to use it then paste it in some where and set your handler code in locationHashChanged qs  where commented  and then call changeHashValue hashQuery  every time you load an ajax request   Its not a quick-fix answer and there are none  so you will need to think about it and pass sensible hashQuery args  ie a 1 amp b 2  to changeHashValue hashQuery  and then cater for each combination of said args in your locationHashChanged qs  callback         Add code below     function locationHashChanged qs      var q   parseQs qs        ADD SOME CODE HERE TO LOAD YOUR PAGE ELEMS AS PER q         YOU SHOULD CATER FOR EACH hashQuery ATTRS COMBINATION       THAT IS PASSED TO changeHashValue hashQuery        CALL THIS FROM YOUR AJAX LOAD CODE EACH LOAD     function changeHashValue hashQuery      stopHashListener      hashValue       hashQuery    location hash   hashQuery    startHashListener          AND DONT WORRY ABOUT ANYTHING BELOW     function checkIfHashChanged       var hashQuery   getHashQuery      if  hashQuery    hashValue      return    hashValue   hashQuery    locationHashChanged hashQuery      function parseQs qs      var q         var pairs   qs split   amp       for  var idx in pairs        var arg   pairs idx  split           q arg 0     arg 1         return q     function startHashListener       hashListener   setInterval checkIfHashChanged  1000      function stopHashListener       if  hashListener    null      clearInterval hashListener     hashListener   null     function getHashQuery       return location hash replace               var hashListener   null  var hashValue           getHashQuery    startHashListener

User · Answer

jQuery BBQ  Back Button  amp  Query Library   A high quality hash-based browser history plugin and very much up-to-date  Jan 26  2010  as of this writing  jQuery 1 4 1

User · Answer

The answers here are all quite old   In the HTML5 world  you should the use onpopstate event   window onpopstate   function event        alert  location      document location      state      JSON stringify event state         Or   window addEventListener  popstate   function event        alert  location      document location      state      JSON stringify event state          The latter snippet allows multiple event handlers to exist  whereas the former will replace any existing handler which may cause hard-to-find bugs

User · Answer

HTML5 has included a much better solution than using hashchange which is the HTML5 State Management APIs - https   developer mozilla org en DOM Manipulating the browser history - they allow you to change the url of the page  without needing to use hashes   Though the HTML5 State Functionality is only available to HTML5 Browsers  So you probably want to use something like History js which provides a backwards compatible experience to HTML4 Browsers  via hashes  but still supports data and titles as well as the replaceState functionality    You can read more about it here  https   github com browserstate History js

User · Answer

Another great implementation is balupton s jQuery History which will use the native onhashchange event if it is supported by the browser  if not it will use an iframe or interval appropriately for the browser to ensure all the expected functionality is successfully emulated  It also provides a nice interface to bind to certain states   Another project worth noting as well is jQuery Ajaxy which is pretty much an extension for jQuery History to add ajax to the mix  As when you start using ajax with hashes it get s quite complicated

User · Answer

The answers here are all quite old   In the HTML5 world  you should the use onpopstate event   window onpopstate   function event        alert  location      document location      state      JSON stringify event state         Or   window addEventListener  popstate   function event        alert  location      document location      state      JSON stringify event state          The latter snippet allows multiple event handlers to exist  whereas the former will replace any existing handler which may cause hard-to-find bugs

User · Answer

Another great implementation is balupton s jQuery History which will use the native onhashchange event if it is supported by the browser  if not it will use an iframe or interval appropriately for the browser to ensure all the expected functionality is successfully emulated  It also provides a nice interface to bind to certain states   Another project worth noting as well is jQuery Ajaxy which is pretty much an extension for jQuery History to add ajax to the mix  As when you start using ajax with hashes it get s quite complicated

User · Answer

jQuery BBQ  Back Button  amp  Query Library   A high quality hash-based browser history plugin and very much up-to-date  Jan 26  2010  as of this writing  jQuery 1 4 1

User · Answer

HTML5 has included a much better solution than using hashchange which is the HTML5 State Management APIs - https   developer mozilla org en DOM Manipulating the browser history - they allow you to change the url of the page  without needing to use hashes   Though the HTML5 State Functionality is only available to HTML5 Browsers  So you probably want to use something like History js which provides a backwards compatible experience to HTML4 Browsers  via hashes  but still supports data and titles as well as the replaceState functionality    You can read more about it here  https   github com browserstate History js

User · Answer

Try simple  amp  lightweight PathJS lib   Simple example   Path map    page   to function        alert  page

[javascript] Detecting Back Button/Hash Change in URL

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