How to include view partial specific styling in AngularJS

Question

What is the proper accepted way to use separate stylesheets for the various views my application uses   Currently I m placing a link element in the view partial s html at the top but I ve been told this is bad practice even though all modern browsers support it but I can see why it s frowned upon   The other possibility is placing the separate stylesheets in my index html s head but I would like it to only load the stylesheet if its view is being loaded in the name of performance   Is this bad practice since styling won t take effect until after the css is loaded form the server  leading to a quick flash of unformatted content in a slow browser  I have yet to witness this although I m testing it locally   Is there a way to load the CSS through the object passed to Angular s  routeProvider when   Thanks in advance

User · Answer

If you only need your CSS to be applied to one specific view  I m using this handy snippet inside my controller      body   addClass  mystate      scope  on   destroy   function          body   removeClass  mystate           This will add a class to my body tag when the state loads  and remove it when the state is destroyed  i e  someone changes pages   This solves my related problem of only needing CSS to be applied to one state in my application

User · Answer

tennisgent s solution is great  However  I think is a little limited   Modularity and Encapsulation in Angular goes beyond routes  Based on the way the web is moving towards component-based development  it is important to apply this in directives as well   As you already know  in Angular we can include templates  structure  and controllers  behavior  in pages and components  AngularCSS enables the last missing piece  attaching stylesheets  presentation    For a full solution I suggest using AngularCSS     Supports Angular s ngRoute  UI Router  directives  controllers and services   Doesn t required to have ng-app in the  lt html gt  tag  This is important when you have multiple apps running on the same page You can customize where the stylesheets are injected  head  body  custom selector  etc    Supports preloading  persisting and cache busting Supports media queries and optimizes page load via matchMedia API   https   github com door3 angular-css  Here are some examples   Routes     routeProvider      when   page1           templateUrl   page1 page1 html         controller   page1Ctrl            Now you can bind css to routes          css   page1 page1 css              when   page2           templateUrl   page2 page2 html         controller   page2Ctrl            You can also enable features like bust cache  persist and preload          css            href   page2 page2 css           bustCache  true                     when   page3           templateUrl   page3 page3 html         controller   page3Ctrl            This is how you can include multiple stylesheets          css    page3 page3 css   page3 page3-2 css               when   page4           templateUrl   page4 page4 html         controller   page4Ctrl         css                        href   page4 page4 css             persist  true                        href   page4 page4 mobile css                Media Query support via window matchMedia API              This will only add the stylesheet if the breakpoint matches              media   screen and  max-width   768px                          href   page4 page4 print css             media   print                              Directives  myApp directive  myDirective   function        return       restrict   E       templateUrl   my-directive my-directive html       css   my-directive my-directive css            Additionally  you can use the  css service for edge cases   myApp controller  pageCtrl   function   scope   css          Binds stylesheet s  to scope create destroy events  recommended over add remove     css bind        href   my-page my-page css        scope         Simply add stylesheet s     css add  my-page my-page css          Simply remove stylesheet s     css remove   my-page my-page css   my-page my-page2 css           Remove all stylesheets    css removeAll           You can read more about AngularCSS here   http   door3 com insights introducing-angularcss-css-demand-angularjs

User · Answer

use strict   angular module  app        run                          rootScope     state     stateParams               function  rootScope   state   stateParams                     rootScope  state    state                   rootScope  stateParams    stateParams                                     config                          stateProvider     urlRouterProvider               function  stateProvider   urlRouterProvider                  urlRouterProvider                  otherwise   app dashboard                 stateProvider                  state  app                         abstract  true                      url    app                       templateUrl   views layout html                                      state  app dashboard                         url    dashboard                       templateUrl   views dashboard html                       ncyBreadcrumb                            label   Dashboard                           description                                                resolve                            deps                                  ocLazyLoad                               function  ocLazyLoad                                    return  ocLazyLoad load                                       serie  true                                      files                                             lib jquery charts sparkline jquery sparkline js                                            lib jquery charts easypiechart jquery easypiechart js                                            lib jquery charts flot jquery flot js                                            lib jquery charts flot jquery flot resize js                                            lib jquery charts flot jquery flot pie js                                            lib jquery charts flot jquery flot tooltip js                                            lib jquery charts flot jquery flot orderBars js                                            app controllers dashboard js                                            app directives realtimechart js                                                                                                                                                                                              state  ram                         abstract  true                      url    ram                       templateUrl   views layout-ram html                                      state  ram dashboard                         url    dashboard                       templateUrl   views dashboard-ram html                       ncyBreadcrumb                            label   test                                             resolve                            deps                                  ocLazyLoad                               function  ocLazyLoad                                    return  ocLazyLoad load                                       serie  true                                      files                                             lib jquery charts sparkline jquery sparkline js                                            lib jquery charts easypiechart jquery easypiechart js                                            lib jquery charts flot jquery flot js                                            lib jquery charts flot jquery flot resize js                                            lib jquery charts flot jquery flot pie js                                            lib jquery charts flot jquery flot tooltip js                                            lib jquery charts flot jquery flot orderBars js                                            app controllers dashboard js                                            app directives realtimechart js

User · Answer

Awesome  thank you   Just had to make a few adjustments to get it working with ui-router       var app   app    angular module  app             app directive  head      rootScope     compile     state   function   rootScope   compile   state         return           restrict   E           link  function   scope  elem  attrs  ctrls                 var html     lt link rel  stylesheet  ng-repeat   routeCtrl  cssUrl  in routeStyles  ng-href    cssUrl      gt                var el    compile html   scope              elem append el                scope routeStyles                    function applyStyles state  action                    var sheets   state   state css   null                  if  state parent                        var parentState    state get state parent                      applyStyles parentState  action                                     if  sheets                        if   Array isArray sheets                             sheets    sheets                                             angular forEach sheets  function  sheet                            action sheet                                                                         rootScope  on   stateChangeStart   function  event  toState  toParams  fromState  fromParams                     applyStyles fromState  function sheet                        delete  scope routeStyles sheet                       console log   gt  gt  remove  gt  gt     sheet                                        applyStyles toState  function sheet                         scope routeStyles sheet    sheet                      console log   gt  gt  add  gt  gt     sheet

User · Answer

sz3  funny enough today I had to do exactly what you were trying to achieve   load a specific CSS file only when a user access  a specific page  So I used the solution above   But I am here to answer your last question   where exactly should I put the code  Any ideas    You were right including the code into the resolve  but you need to change a bit the format   Take a look at the code below    when   home       title  Home -     siteName    bodyClass   home     templateUrl  function params        return  views home html          controler   homeCtrl     resolve        style   function             check if already exists first - note ID used on link element            could also track within scope object         if   angular element  link mobile   length           angular element  head   append   lt link id  home  href  home css  rel  stylesheet  gt                            I ve just tested and it s working fine  it injects the html and it loads my  home css  only when I hit the   home  route   Full explanation can be found here  but basically resolve  should get an object in the format        key    string or function        You can name the  key  anything you like - in my case I called  style    Then for the value you have two options    If it s a string  then it is an alias for a service  If it s function  then it is injected and the return value is treated as the dependency    The main point here is that the code inside the function is going to be executed before before the controller is instantiated and the  routeChangeSuccess event is fired   Hope that helps

User · Answer

Could append a new stylesheet to head within  routeProvider  For simplicity am using a string but could create new link element also  or create a service for stylesheets     check if already exists first - note ID used on link element      could also track within scope object   if   angular element  link myViewName   length       angular element  head   append   lt link id  myViewName  href  myViewName css  rel  stylesheet  gt         Biggest benefit of prelaoding in page is any background images will already exist  and less lieklyhood of FOUC

User · Answer

I know this question is old now  but after doing a ton of research on various solutions to this problem  I think I may have come up with a better solution   UPDATE 1  Since posting this answer  I have added all of this code to a simple service that I have posted to GitHub   The repo is located here   Feel free to check it out for more info  UPDATE 2  This answer is great if all you need is a lightweight solution for pulling in stylesheets for your routes  If you want a more complete solution for managing on-demand stylesheets throughout your application  you may want to checkout Door3 s AngularCSS project  It provides much more fine-grained functionality   In case anyone in the future is interested  here s what I came up with  1   Create a custom directive for the  lt head gt  element  app directive  head      rootScope    compile       function  rootScope   compile           return               restrict   E               link  function scope  elem                   var html     lt link rel  quot stylesheet quot  ng-repeat  quot  routeCtrl  cssUrl  in routeStyles quot  ng-href  quot   cssUrl   quot    gt                    elem append  compile html  scope                    scope routeStyles                        rootScope  on   routeChangeStart   function  e  next  current                        if current  amp  amp  current   route  amp  amp  current   route css                           if  angular isArray current   route css                                current   route css    current   route css                                                     angular forEach current   route css  function sheet                               delete scope routeStyles sheet                                                                         if next  amp  amp  next   route  amp  amp  next   route css                           if  angular isArray next   route css                                next   route css    next   route css                                                     angular forEach next   route css  function sheet                               scope routeStyles sheet    sheet                                                                                                            This directive does the following things   It compiles  using  compile  an html string that creates a set of  lt link   gt  tags for every item in the scope routeStyles object using ng-repeat and ng-href  It appends that compiled set of  lt link   gt  elements to the  lt head gt  tag  It then uses the  rootScope to listen for   routeChangeStart  events   For every   routeChangeStart  event  it grabs the  quot current quot    route object  the route that the user is about to leave  and removes its partial-specific css file s  from the  lt head gt  tag   It also grabs the  quot next quot    route object  the route that the user is about to go to  and adds any of its partial-specific css file s  to the  lt head gt  tag  And the ng-repeat part of the compiled  lt link   gt  tag handles all of the adding and removing of the page-specific stylesheets based on what gets added to or removed from the scope routeStyles object   Note  this requires that your ng-app attribute is on the  lt html gt  element  not on  lt body gt  or anything inside of  lt html gt   2  Specify which stylesheets belong to which routes using the  routeProvider  app config    routeProvider   function  routeProvider        routeProvider          when   some route 1                 templateUrl   partials partial1 html                controller   Partial1Ctrl               css   css partial1 css                      when   some route 2                 templateUrl   partials partial2 html               controller   Partial2Ctrl                      when   some route 3                 templateUrl   partials partial3 html               controller   Partial3Ctrl               css    css partial3 1 css   css partial3 2 css                    This config adds a custom css property to the object that is used to setup each page s route   That object gets passed to each   routeChangeStart  event as    route   So when listening to the   routeChangeStart  event  we can grab the css property that we specified and append remove those  lt link   gt  tags as needed   Note that specifying a css property on the route is completely optional  as it was omitted from the   some route 2  example  If the route doesn t have a css property  the  lt head gt  directive will simply do nothing for that route   Note also that you can even have multiple page-specific stylesheets per route  as in the   some route 3  example above  where the css property is an array of relative paths to the stylesheets needed for that route  3  You re done Those two things setup everything that was needed and it does it  in my opinion  with the cleanest code possible  Hope that helps someone else who might be struggling with this issue as much as I was

[css] How to include view/partial specific styling in AngularJS

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