How do I get the Back Button to work with an AngularJS ui-router state machine

Question

I have implemented an angularjs single page application using ui-router    Originally I identified each state using a distinct url however this made for unfriendly  GUID packed urls   So I have now defined my site as a much simpler state-machine  The states are not identified by urls but are simply transitioned to as required  like this   Define Nested States  angular  module  app     ui router    config   stateProvider  - gt       stateProvider      state  main            templateUrl   main html          controller   mainCtrl          params    locationId         state  folder            templateUrl   folder html          parent   main          controller   folderCtrl          resolve              folder  apiService  - gt  apiService get   base folder  locationId    Transition to a Defined State   The ui-sref attrib transitions to the  folder  state  a ui-sref  folder  locationId    folder Id                 folder Name      This system works very well and I love its clean syntax  However  as I am not using urls the back button does not work    How do I keep my neat ui-router state-machine but enable the back button functionality

User · Answer

After testing different proposals  I found that the easiest way is often the best   If you use angular ui-router and that you need a button to go back best is this    lt button onclick  history back    gt Back lt  button gt    or   lt a onclick  history back   gt Back lt  a gt       Warning don t set the href or the path will be broken   Explanation  Suppose a standard management application  Search object -  View object -  Edit object  Using the angular solutions From this state       Search -  View -  Edit   To       Search -  View   Well that s what we wanted except if now you click the browser back button you ll be there again       Search -  View -  Edit   And that is not logical  However using the simple solution   lt a onclick  history back    gt  Back  lt  a gt    from       Search -  View -  Edit   after click on button       Search -  View   after click on browser back button       Search   Consistency is respected   -

User · Answer

browser s back forward button solution I encountered the same problem and I solved it using the popstate event from the  window object and ui-router s  state object  A popstate event is dispatched to the window every time the active history entry changes  The  stateChangeSuccess and  locationChangeSuccess events are not triggered on browser s button click even though the address bar indicates the new location  So  assuming you ve navigated from states main to folder to main again  when you hit back on the browser  you should be back to the folder route  The path is updated but the view is not and still displays whatever you have on main  try this   angular  module  app     ui router    run  state   window           window onpopstate   function event             var stateName    state current name              pathname    window location pathname split      1               routeParams           i e -  state params          console log  state current name  pathname       main    folder           if   state current name indexOf pathname      -1                   Optionally set option notify to false if you don t want                 to retrigger another  stateChangeStart event              state go                 state current name                 routeParams                 reload true  notify  false                                      back forward buttons should work smoothly after that   note  check browser compatibility for window onpopstate   to be sure

User · Answer

app run    window     rootScope    function   window     rootScope       rootScope goBack   function         window history back               lt a href     ng-click  goBack    gt Back lt  a gt

User · Answer

history back   and switch to previous state often give effect not that you want  For example  if you have form with tabs and each tab has own state  this  just switched previous tab selected  not return from form  In case nested states  you usually need so think about witch of parent states you want to rollback    This directive solves problem  angular module  app     ui-router-back      lt span ui-back  defaultState  gt  Go back  lt  span gt    It returns to state  that was active before button has displayed  Optional defaultState is state name that used when no previous state in memory  Also it restores scroll position  Code   class UiBackData       fromStateName  string      fromParams  any      fromStateScroll  number     interface IRootScope1 extends ng IScope       uiBackData  UiBackData     class UiBackDirective implements ng IDirective       uiBackDataSave  UiBackData       constructor private  state  angular ui IStateService          private  rootScope  IRootScope1          private  timeout  ng ITimeoutService               link  ng IDirectiveLinkFn    scope  element  attrs    gt            this uiBackDataSave   angular copy this  rootScope uiBackData            function parseStateRef ref  current                var preparsed   ref match    s           s      parsed              if  preparsed  ref   current         preparsed 1                     parsed   ref replace   n g       match            s                             if   parsed    parsed length     4                  throw new Error  Invalid state ref      ref                     let paramExpr   parsed 3     null              let copy   angular copy scope  eval paramExpr                return   state  parsed 1   paramExpr  copy                       element on  click    e    gt                e preventDefault                 if  this uiBackDataSave fromStateName                  this  state go this uiBackDataSave fromStateName  this uiBackDataSave fromParams                       then state   gt                               Override ui-router autoscroll                          this  timeout      gt                                  window  scrollTop this uiBackDataSave fromStateScroll                              500  false                                       else                   var r   parseStateRef   lt any gt attrs  uiBack  this  state current                   this  state go r state  r paramExpr                                         public static factory    ng IDirectiveFactory           const directive     state   rootScope   timeout    gt              new UiBackDirective  state   rootScope   timeout           directive  inject      state     rootScope     timeout            return directive           angular module  ui-router-back        directive  uiBack   UiBackDirective factory         run    rootScope             rootScope  IRootScope1    gt                  rootScope  on   stateChangeSuccess                    event  toState  toParams  fromState  fromParams    gt                        if   rootScope uiBackData    null                           rootScope uiBackData   new UiBackData                         rootScope uiBackData fromStateName   fromState name                       rootScope uiBackData fromStateScroll     window  scrollTop                         rootScope uiBackData fromParams   fromParams

User · Answer

Can be solved using a simple directive  go-back-history   this one is also closing window in case of no previous history   Directive usage   lt a data-go-back-history gt Previous State lt  a gt    Angular directive declaration   directive  goBackHistory      window   function   window        return           restrict   A           link  function  scope  elm  attrs                elm on  click   function   event                     event stopPropagation                    if   window history length                         window history back                      else                        window close                                                               Note  Working using ui-router or not

User · Answer

Note  The answers that suggest using variations of  window history back   have all missed a crucial part of the question  How to restore the application s state to the correct state-location as the history jumps  back forward refresh   With that in mind  please  read on     Yes  it is possible to have the browser back forward  history  and refresh whilst running a pure ui-router state-machine but it takes a bit of doing    You need several components    Unique URLs  The browser only enables the back forward buttons when you change urls  so you must generate a unique url per visited state  These urls need not contain any state information though  A Session Service  Each generated url is correlated to a particular state so you need a way to store your url-state pairs so that you can retrieve the state information after your angular app has been restarted by back   forward or refresh clicks  A State History  A simple dictionary of ui-router states keyed by unique url  If you can rely on HTML5 then you can use the HTML5 History API  but if  like me  you can t then you can implement it yourself in a few lines of code  see below   A Location Service  Finally  you need to be able manage both ui-router state changes  triggered internally by your code  and normal browser url changes typically triggered by the user clicking browser buttons or typing stuff into the browser bar  This can all get a bit tricky because it is easy to get confused about what triggered what    Here is my implementation of each of these requirements  I have bundled everything up into three services   The Session Service  class SessionService      setStorage  key  value  - gt          json    if value is undefined then null else JSON stringify value         sessionStorage setItem key  json      getStorage  key - gt          JSON parse sessionStorage getItem key      clear  - gt           setStorage key  null  for key of sessionStorage      stateHistory  value null  - gt           accessor  stateHistory   value        other properties goes here      accessor  name  value - gt          return  getStorage name unless value           setStorage name  value  angular  module  app Services   service  sessionService   SessionService   This is a wrapper for the javascript sessionStorage object  I have cut it down for clarity here  For a full explanation of this please see  How do I handle page refreshing with an AngularJS Single Page Application  The State History Service  class StateHistoryService       inject   sessionService       constructor   sessionService  - gt       set  key  state - gt          history    sessionService stateHistory                history key    state          sessionService stateHistory history      get  key - gt           sessionService stateHistory    key   angular  module  app Services   service  stateHistoryService   StateHistoryService   The StateHistoryService looks after the storage and retrieval of historical states keyed by generated  unique urls  It is really just a convenience wrapper for a dictionary style object   The State Location Service  class StateLocationService     preventCall          inject    location    state    stateHistoryService       constructor   location   state   stateHistoryService  - gt       locationChange  - gt          return if  preventCall pop  locationChange            entry    stateHistoryService get  location url           return unless entry           preventCall push  stateChange           state go entry name  entry params   location false       stateChange  - gt          return if  preventCall pop  stateChange            entry    name   state current name  params   state params           generate your site specific  unique url here         url        state params subscriptionUrl    Math guid   substr 0 8             stateHistoryService set url  entry          preventCall push  locationChange           location url url  angular  module  app Services   service  stateLocationService   StateLocationService   The StateLocationService handles two events    locationChange  This is called when the browsers location is changed  typically when the back forward refresh button is pressed or when the app first starts or when the user types in a url  If a state for the current location url exists in the StateHistoryService then it is used to restore the state via ui-router s  state go  stateChange  This is called when you move state internally  The current state s name and params  are stored in the StateHistoryService keyed by a generated url  This generated url can be anything you want  it may or may not identify the state in a human readable way  In my case I am using a state param plus a randomly generated sequence of digits derived from a guid  see foot for the guid generator snippet   The generated url is displayed in the browser bar and  crucially  added to the browser s internal history stack using  location url url  Its adding the url to the browser s history stack that enables the forward   back buttons    The big problem with this technique is that calling  location url url in the stateChange method will trigger the  locationChangeSuccess event and so call the locationChange method  Equally calling the  state go from locationChange will trigger the  stateChangeSuccess event and so the stateChange method  This gets very confusing and messes up the browser history no end   The solution is very simple  You can see the preventCall array being used as a stack  pop and push   Each time one of the methods is called it prevents the other method being called one-time-only  This technique does not interfere with the correct triggering of the   events and keeps everything straight   Now all we need to do is call the HistoryService methods at the appropriate time in the state transition life-cycle  This is done in the AngularJS Apps  run method  like this   Angular app run  angular  module  app     ui router    run   rootScope  stateLocationService  - gt        rootScope  on   stateChangeSuccess    event  toState  toParams  - gt          stateLocationService stateChange         rootScope  on   locationChangeSuccess   - gt          stateLocationService locationChange     Generate a Guid  Math guid   - gt      s4   - gt  Math floor  1   Math random      0x10000  toString 16  substring 1         s4     s4   -  s4   -  s4   -  s4   -  s4     s4     s4       With all this in place  the forward   back buttons and the refresh button all work as expected

User · Answer

If you are looking for the simplest  back  button  then you could set up a directive like so        directive  back   function factory  window          return           restrict      E           replace      true          transclude   true          templateUrl   wherever your template is located           link  function  scope  element  attrs              scope navBack   function                  window history back                                              Keep in mind this is a fairly unintelligent  back  button because it is using the browser s history  If you include it on your landing page  it will send a user back to any url they came from prior to landing on yours

User · Answer

The Back button wasn t working for me as well  but I figured out that the problem was that I had html content inside my main page  in the ui-view element   i e     lt div ui-view gt        lt h1 gt  Hey Kids   lt  h1 gt        lt  -- More content -- gt   lt  div gt    So I moved the content into a new  html file  and marked it as a template in the  js file with the routes    i e       state  parent mystuff             url    mystuff           controller   myStuffCtrl           templateUrl   myStuff html

[javascript] How do I get the Back Button to work with an AngularJS ui-router state machine?

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