Angularjs - ng-cloak ng-show elements blink

Question

I have an issue in angular js with directive class ng-cloak or ng-show   Chrome works fine  but Firefox is causing blink of elements with ng-cloak or ng-show  IMHO it s caused by the converting ng-cloak ng-show to style  display  none    probably the Firefox javascript compiler is little bit slower  so the elements appears for a while and then hide   Example    lt ul ng-show  foo    null  ng-cloak gt    lt  ul gt

User · Answer

I couldn t get any of these methods to work  so I eventually did the following  For the element you want initially hidden    lt div  lt  --   -- gt  style  display  none   ng-style  style  gt    Then in your controller  add this at or near the top    scope style     display   block       This way  the element is initially hidden  and only shows when the controller code has actually run   You can tune the placement to your needs  perhaps adding some logic  In my case  I switch to a login path if not currently logged in  and didn t want my interface flickering beforehand  so I set  scope style after the logged-in check

User · Answer

I m using ionic framework  adding css style might not work for certain circumstances  you can try using ng-if instead of ng-show   ng-hide  ref  https   books google com my books id - 5 CwAAQBAJ amp pg PA138 amp lpg PA138 amp dq ng-show hide flickering in ios amp source bl amp ots m2Turk8DFh amp sig 8hNiWx26euGR2k WeyaVzdixJ8k amp hl en amp sa X amp redir esc y v onepage amp q ng-show 20hide 20flickering 20in 20ios amp f false

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In addition to other answers  if you find the flash of template code to still be occuring it is likely you have your scripts at the bottom of the page and that means that the ng-cloak directive straight up will not work  You can either move your scripts to the head or create a CSS rule   The docs say  For the best result  the angular js script must be loaded in the head section of the html document  alternatively  the css rule above must be included in the external stylesheet of the application    Now  it doesn t have to be an external stylesheet but just in a  element in the head    lt style type  text css  gt     ng-cloak       display  none  important       lt  style gt    source  https   docs angularjs org api ng directive ngCloak

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I personally decided to use the ng-class attribute rather than the ng-show  I ve had a lot more success going this route especially for pop-up windows that are always not shown by default    What used to be  lt div class  options-modal  ng-show  showOptions  gt  lt  div gt   is now   lt div class  options-modal  ng-class    show   isPrintModalShown   gt   with the CSS for the options-modal class being display  none by default  The show class contains the display block CSS

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I had a problem where a  lt div ng-show  expression  gt  would be initially visible for a fraction of a second  even though  expression  was initially false  before the ng-show directive got a chance to run   The solution I used was to manually add the  ng-hide  class  as in  lt div ng-show  expression  ng-hide gt   to make sure it started initially hidden  The ng-show directive will add remove the ng-hide class as necessary after that

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There s actually two separate problems that can cause the flicker issue and you could be facing either one or both of these    Problem 1  ng-cloak is applied too late  This issue is solved as descibed in many of the answers on this page is to make sure AngularJS is loaded in the head  See ngCloak doc      For the best result  angular js script must be loaded in the head   section of the html file  alternatively  the css rule  above  must be   included in the external stylesheet of the application    Problem 2  ng-cloak is removed too soon   This issue is most likely to occur when you have a lot of CSS on your page with rules cascading over one another and the deeper layers of CSS flash up before the top layer is applied    The jQuery solutions in answers involving adding style  display none  to your element do solve this issue so long as the style is removed late enough  in fact these solutions solve both problems   However  if you prefer not to add styles directly to your HTML you can achieve the same results using ng-show   Starting with the example from the question    lt ul ng-show  foo    null  ng-cloak gt    lt  ul gt    Add an additional ng-show rule to your element    lt ul ng-show  isPageFullyLoaded  amp  amp   foo    null   ng-cloak gt    lt  ul gt     You need to keep ng-cloak to avoid problem 1    Then in your app run set isPageFullyLoaded   app run    rootScope   function   rootScope         rootScope  safeApply   function  fn             rootScope isPageFullyLoaded   true               Be aware that depending on exactly what you re doing  app run may or may not be the best place to set isPageFullyLoaded  The important thing is to make sure that isPageFullyLoaded gets set to true after whatever it is you don t want to flicker is ready to be revealed to the user   It sounds like Problem 1 is the problem the OP is hitting  but others are finding that solution does not work or only partially works because they are hitting Problem 2 instead or as well      Important Note  Be sure to apply solutions to both ng-cloak being applied too late AND removed to soon  Solving only one of these problems may not relieve the symptoms

User · Answer

Make sure AngularJS is included in the head of the HTML   See ngCloak doc      For the best result  angular js script must be loaded in the head   section of the html file  alternatively  the css rule  above  must be   included in the external stylesheet of the application

User · Answer

I tried the ng-cloak solution above but it still has intermittent issues with Firefox  The only workaround that worked for me is to delay the loading of the form until Angular is fully loaded   I simply added ng-init in the app and use ng-if at the form side to check if the variable I set is already loaded    lt div ng-app  myApp  ng-init  loaded  yes   gt       lt form ng-if  loaded length  gt  0  gt         lt  --all my elements here-- gt      lt  form gt   lt  div gt

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I tried every solution posted here and still got flickering in Firefox   If it helps anyone  I solved it by adding style  display  none   to the main content div  then using jQuery  I was already using it on the page      main-div-id   show    once everything was loaded after getting data from the server

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In addition to the accepted answer if you re using an alternative method of triggering ng-cloak     You may also wish to add some additional specificities to your CSS LESS    ng  cloak    ng-cloak    data-ng-cloak    x-ng-cloak    ng-cloak   x-ng-cloak   ng-hide       display  none  important

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We ran into this problem at our company and solved it by adding  display  none  to the CSS styling for those flickering ng-show elements  We didn t have to use ng-cloak at all  Unlike others in this thread  we experienced this issue in Safari but not Firefox or Chrome -- possibly due to Safari s lazy repaint bug in iOS7

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I actually found the suggestion from Rick Strahl s Web Log fixed my issue perfectly  as I still had the odd issue with ng-cloak blinking raw   code   at times  especially while running Firebug    The nuclear option  Hiding the Content manually  Using the explicit CSS is the best choice  so the following shouldn   t ever be necessary  But I   ll mention it here as it gives some insight how you can hide show content manually on load for other frameworks or in your own markup based templates   Before I figured out that I could explicitly embed the CSS style into the page  I had tried to figure out why ng-cloak wasn   t doing its job  After wasting an hour getting nowhere I finally decided to just manually hide and show the container  The idea is simple     initially hide the container  then show it once Angular has done its initial processing and removal of the template markup from the page   You can manually hide the content and make it visible after Angular has gotten control  To do this I used    lt div id  mainContainer  class  mainContainer boxshadow      ng-app  app  style  display none  gt    Notice the display  none style that explicitly hides the element initially on the page   Then once Angular has run its initialization and effectively processed the template markup on the page you can show the content  For Angular this    ready    event is the app run   function   app run  function   rootScope   location  cellService                    mainContainer   show                  This effectively removes the display none style and the content displays  By the time app run   fires the DOM is ready to displayed with filled data or at least empty data     Angular has gotten control

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Though the documentation doesn t mention it  it might not be enough to add the display  none  rule to your CSS   In cases where you are loading angular js in the body or templates aren t compiled soon enough  use the ng-cloak directive and include the following in your CSS         Allow angular js to be loaded in body  hiding cloaked elements until    templates compile   The  important is important given that there may be    other selectors that are more specific or come later and might alter display         ng  cloak    ng-cloak    ng-cloak     display  none  important      As mentioned in the comment  the  important is important   For example  if you have the following markup   lt ul class  nav  gt     lt li gt  lt a href   foo  ng-cloak gt   bar   lt  a gt  lt  li gt   lt  ul gt    and you happen to be using bootstrap css  the following selector is more specific for your ng-cloak ed element   nav  gt  li  gt  a     display  block      So if you include a rule with simply display  none   Bootstrap s rule will take precedence and the display will be set to block  so you ll see the flicker before the template compiles

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AS from the above discussion    ng-cloak                    display  none                  is the perfect way to solve the Problem

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For what it s worth  I had a similar issue ng-cloak not working  It may be worth checking your app site with cache enabled to reuse source files to see if that helps   With my run-in with flickering  I was testing with DevTools open and cache disabled  Leaving the panel closed with caching enabled fixed my issue

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I m using ng-show in a directive to show and hide popups    lt div class       ng-show  showPopup  gt    None of the above worked for me  and using ng-if instead of ng-show would be an overkill  That would imply removing and adding the whole popup content into the DOM at every single click  Instead I added an ng-if into the same element to make sure it doesn t show at the document load    lt div class       ng-show  showPopup  ng-if  popupReady  gt    Afterwards I added the initialization into the controller responsible of this directive with a timeout    timeout function           scope popupReady   true        This way I eliminated the flickering issue and avoided the costly operation of DOM insertion at every single click  This came at an expense of using two scope variables for the same purpose instead of one  but so far this is definitely the best option

User · Answer

you d better reference angular document  becuase the version 1 4 9  has update to below that make it could support data-ng-cloak directive     ng  cloak    ng-cloak    data-ng-cloak    x-ng-cloak    ng-cloak   x-ng-cloak     display  none  important

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Keeping the below statements in head tag fixed this issue   lt style type  text css  gt       ng  cloak    ng-cloak    data-ng-cloak    x-ng-cloak    ng-cloak   x-ng-cloak       display  none  important     lt  style gt    official documentation

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I ve never had much luck using ngCloak   I still get flickering despite everything mentioned above   The only surefire way to avoid flicking is to put your content in a template and include the template   In a SPA  the only HTML that will get evaluated before being compiled by Angular is your main index html page     Just take everything inside the body and stick it in a separate file and then    lt ng-include src   views indexMain html   gt  lt  ng-include gt    You should never get any flickering that way as Angular will compile the template before adding it to the DOM

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I would would wrap the  lt ul gt  with a  lt div ng-cloak gt

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None of the solutions listed above worked for me  I then decided to look at the actual function and realised that when     scope watch     was fired  it was putting a value in the name field which was not meant to be the case  So in the code I set and oldValue and newValue then   scope  watch  model value   function newValue  oldValue    if  newValue     oldValue    validateValue newValue           Essentially when scope watch is fired in this case  AngularJS monitors the changes to the name variable  model value

User · Answer

It s better to use ng-if instead of ng-show  ng-if  completely removes and recreates the element in the DOM and helps to avoid ng-shows blinking

User · Answer

Try to turn off the Firebug  I m serious  This helps in my case   Apply accepted answer and then make sure that Firebug in your Firefox is turned off  press F12 then turn off Firebug for this page - small button in upper right corner

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ngBind and ngBindTemplate are alternatives that do not require CSS    lt div ng-show  foo    null  ng-cloak gt   name   lt  div gt    lt  -- requires CSS -- gt   lt div ng-show  foo    null  ng-bind  name  gt  lt  div gt   lt div ng-show  foo    null  ng-bind-template  name     name    gt  lt  div gt

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I tried all of the answers above and nothing worked   Using ionic to develop a hybrid app and was trying to make an error message not flicker   I ended up solving my issue by adding an ng-hide class to my element   My div already has ng-show to show the element when there is an error   Adding ng-hide set the div to not display before angular is loaded   No ng-cloak or adding angular to the head necessary

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Avoid line break   lt meta http-equiv  Content-Security-Policy               content   default-src  FOO      script-src  FOO       style-src   FOO    font-src  FOO    gt    Works with Firefox 45 0 1   lt meta http-equiv  Content-Security-Policy               content      default-src  FOO      script-src  FOO       style-src   FOO      font-src  FOO    gt

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I had a similar issue and found out that if you have a class that contains transitions  the element will blink  I tried to add ng-cloak without success  but by removing the transition the button stopped blinking   I m using ionic framework and the button-outline has this transition   button-outline     -webkit-transition  opacity  1s    transition  opacity  1s      Simply overwrite the class to remove the transition and the button will stop blinking   Update  Again on ionic there is a flicker when using ng-show ng-hide  Adding the following CSS resolves it    ng-hide-add   ng-hide-remove     display  none  important      Source  http   forum ionicframework com t beta-14-ng-hide-show 14270 9

User · Answer

Tried ng-cloak but still brief blinks  Below code rid them completely    lt body style  display none   ng-style    display   block    gt

User · Answer

As mentioned in the documentation  you should add a rule to your CSS to hide it based on the ng-cloak attribute    ng  cloak    ng-cloak    ng-cloak       display  none      We use similar tricks on the  Built with Angular  site  which you can view the source of on Github  https   github com angular builtwith angularjs org  Hope that helps

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