AngularJS How to run additional code after AngularJS has rendered a template

Question

I have an Angular template in the DOM   When my controller gets new data from a service  it updates the model in the  scope  and re-renders the template   All good so far   The issue is that I need to also do some extra work after the template has been re-rendered and is in the DOM  in this case a jQuery plugin    It seems like there should be an event to listen to  such as AfterRender  but I can t find any such thing   Maybe a directive would be a way to go  but it seemed to fire too early as well   Here is a jsFiddle outlining my problem  Fiddle-AngularIssue     UPDATE     Based on helpful comments  I ve accordingly switched to a directive to handle DOM manipulation  and implemented a model  watch inside the directive   However  I still am having the same base issue  the code inside of the  watch event fires before the template has been compiled and inserted into the DOM  therefore  the jquery plugin is always evaluating an empty table   Interestingly  if I remove the async call the whole thing works fine  so that s a step in the right direction   Here is my updated Fiddle to reflect these changes  http   jsfiddle net uNREn 12

User · Answer

i ve had to do this quite often  i have a directive and need to do some jquery stuff after model stuff is fully loaded into the DOM  so i put my logic in the link  function of the directive and wrap the code in a setTimeout function              1   the setTimout will fire after the DOM is loaded and 1 milisecond is the shortest amount of time after DOM is loaded before code would execute  this seems to work for me but i do wish angular raised an event once a template was done loading so that directives used by that template could do jquery stuff and access DOM elements  hope this helps

User · Answer

You can also create a directive that runs your code in the link function   See that stackoverflow reply

User · Answer

I came with a pretty simple solution  I m not sure whether it is the correct way to do it but it works in a practical sense  Let s directly watch what we want to be rendered  For example in a directive that includes some ng-repeats  I would watch out for the length of text  you may have other things   of paragraphs or the whole html  The directive will be like this    directive  myDirective    function           use strict       return            link  function  scope  element  attrs                scope  watch function                   var whole p length   0                 var ps   element find  p                    for  var i 0 i lt ps length i                         if  ps i  innerHTML    undefined                           continue                                           whole p length   ps i  innerHTML length                                      it could be this too   whole p length   element 0  innerHTML length  but my test showed that the above method is a bit faster                 console log whole p length                   return whole p length                 function  value                         Code you want to be run after rendering changes                                  NOTE that the code actually runs after rendering changes rather complete rendering  But I guess in most cases you can handle the situations whenever rendering changes happen  Also you could think of comparing this ps length  or any other measure  with your model if you want to run your code only once after rendering completed  I appreciate any thoughts comments on this

User · Answer

First  the right place to mess with rendering are directives  My advice would be to wrap DOM manipulating jQuery plugins by directives like this one   I had the same problem and came up with this snippet  It uses  watch and  evalAsync to ensure your code runs after directives like ng-repeat have been resolved and templates like    value    got rendered   app directive  name   function         return           link  function  scope  element  attrs                   Trigger when number of children changes                 including by directives like ng-repeat             var watch    scope  watch function                     return element children   length                 function                        Wait for templates to render                  scope  evalAsync function                            Finally  directives are evaluated                        and templates are renderer here                     var children   element children                        console log children                                                               Hope this can help you prevent some struggle

User · Answer

This post is old  but I change your code to   scope  watch  assignments   function  value     I change here   var val   value    null                if  val      element dataTable   bDestroy   true              see jsfiddle   I hope it helps you

User · Answer

Following Misko s advice  if you want async operation  then instead of  timeout    which doesn t work    timeout function       scope assignmentsLoaded data      1000     use  evalAsync    which does work    scope  evalAsync function      scope assignmentsLoaded data          Fiddle   I also added a  remove row of data  link that will modify  scope assignments  simulating a change to the data model -- to show that changing the data works   The Runtime section of the Conceptual Overview page explains that evalAsync should be used when you need something to occur outside the current stack frame  but before the browser renders    Guessing here     current stack frame  probably includes Angular DOM updates    Use  timeout if you need something to occur after the browser renders   However  as you already found out  I don t think there is any need for async operation here

User · Answer

Neither  scope  evalAsync   or  timeout fn  0  worked reliably for me    I had to combine the two  I made a directive and also put a priority higher than the default value for good measure  Here s a directive for it  Note I use ngInject to inject dependencies    app directive  postrenderAction   postrenderAction        ngInject    function postrenderAction  timeout               Directive Interface        Defines base properties for the directive      var directive             restrict   A           priority  101          link  link            return directive              Link Function        Provides functionality for the directive during the DOM building data binding stage      function link scope  element  attrs             timeout function                 scope  evalAsync attrs postrenderAction              0             To call the directive  you would do this    lt div postrender-action  functionToRun    gt  lt  div gt    If you want to call it after an ng-repeat is done running  I added an empty span in my ng-repeat and ng-if   last     lt li ng-repeat  item in list  gt       lt  -- Do stuff with list -- gt                lt  -- Fire function after the last element is rendered -- gt       lt span ng-if   last  postrender-action   ctrl postRender    gt  lt  span gt   lt  li gt

User · Answer

You can use the  jQuery Passthrough  module of the angular-ui utils  I successfully binded a jQuery touch carousel plugin to some images that I retrieve async from a web service and render them with ng-repeat

User · Answer

Finally i found the solution  i was using a REST service to update my collection  In order to convert datatable jquery is the follow code    scope  watchCollection   conferences   function  old  nuew             if  old     nuew   return               dataTablex    dataTable   fnDestroy             timeout function                           dataTablex    dataTable

User · Answer

I think you are looking for  evalAsync http   docs angularjs org api ng  rootScope Scope  evalAsync

User · Answer

I have found the simplest  cheap and cheerful  solution is simply add an empty span with ng-show    someFunctionThatAlwaysReturnsZeroOrNothing    to the end of the last element rendered   This function will be run when to check if the span element should be displayed   Execute any other code in this function   I realize this is not the most elegant way to do things  however  it works for me     I had a similar situation  though slightly reversed where I needed to remove a loading indicator when an animation began  on mobile devices angular was initializing much faster than the animation to be displayed  and using an ng-cloak was insufficient as the loading indicator was removed well before any real data was displayed   In this case I just added the my return 0 function to the first rendered element  and in that function flipped the var that hides the loading indicator   of course I added an ng-hide to the loading indicator triggered by this function

User · Answer

In some scenarios where you update a service and redirect to a new view page  and then your directive gets loaded before your services are updated then you can use  rootScope  broadcast if your  watch or  timeout fails  View   lt service-history log  log  data-ng-repeat  log in requiedData  gt  lt  service-history gt    Controller  app controller  MyController     scope    rootScope   function  scope   rootScope         scope  on   viewContentLoaded   function             SomeSerive getHistory   then function data                scope requiedData   data              rootScope  broadcast  history-updation                             Directive  app directive  serviceHistory   function         return           restrict   E           replace  true          scope               log                         link  function  scope  element  attrs                function updateHistory                    if log                         do something                                             rootScope  on  history-updation   updateHistory

[javascript] AngularJS: How to run additional code after AngularJS has rendered a template?

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