Angular js init ng-model from default values

Question

Say you have a form that has values loaded from database   How do you initialize ng-model   Example    lt input name  card description   ng-model  card description  value  Visa-4242  gt    In my controller   scope card is undefined initially   Is there a way besides doing something like this    scope card       description     myinput   val

User · Answer

If you can t rework your app to do what  blesh suggests  pull JSON data down with  http or  resource and populate  scope   you can use ng-init instead    lt input name  card description   ng-model  card description  ng-init  card description  Visa-4242   gt    See also AngularJS - Value attribute on an input text box is ignored when there is a ng-model used

User · Answer

You can use a custom directive  with support to textarea  select  radio and checkbox   check out this blog post https   glaucocustodio github io 2014 10 20 init-ng-model-from-form-fields-attributes

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This is an obviously lacking  but easily added fix for AngularJS   Just write a quick directive to set the model value from the input field    lt input name  card description   value  Visa-4242  ng-model  card description  ng-initial gt    Here s my version   var app   angular module  forms         app directive  ngInitial   function       return       restrict   A       controller            scope     element     attrs     parse   function  scope   element   attrs   parse            var getter  setter  val          val    attrs ngInitial     attrs value          getter    parse  attrs ngModel           setter   getter assign          setter  scope  val

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If you like Kevin Stone s approach above https   stackoverflow com a 17823590 584761 consider an easier approach by writing directives for specific tags such as  input      app directive  input   function   parse        return           restrict   E           require    ngModel           link  function  scope  element  attrs                if  attrs ngModel                    val   attrs value    element text                     parse attrs ngModel  assign scope  val                                        If you go this route you won t have to worry about adding ng-initial to every tag   It automatically sets the value of the model to the tag s value attribute   If you do not set the value attribute it will default to an empty string

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I have a simple approach  because i have some heavy validations and masks in my forms  So  i used jquery to get my value again and fire the event  change  to validations       myidelement   val  123        myidelement   trigger   change

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As others pointed out  it is not good practice to initialize data on views  Initializing data on Controllers  however  is recommended   see http   docs angularjs org guide controller   So you can write   lt input name  card description   ng-model  card description  gt    and   scope card     description   Visa-4242       http get   getCardInfo php   function data        scope card   data        This way the views do not contain data  and the controller initializes the value while the real values are being loaded

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Just added support for select element to  Ryan Montgomery  fix    lt select class  input-control  ng-model  regCompModel numberOfEmployeeId  ng-initial gt       lt option value  1af38656-a752-4a98-a827-004a0767a52d  gt  More than 500 lt  option gt       lt option value  233a2783-db42-4fdb-b191-0f97d2d9fd43  gt  Between 250 and 500 lt  option gt       lt option value  2bab0669-550c-4555-ae9f-1fdafdb872e5  gt  Between 100 and 250 lt  option gt       lt option value  d471e43b-196c-46e0-9b32-21e24e5469b4  gt  Between 50 and 100 lt  option gt       lt option value  ccdad63f-69be-449f-8b2c-25f844dd19c1  gt  Between 20 and 50 lt  option gt       lt option value  e00637a2-e3e8-4883-9e11-94e58af6e4b7  selected gt  Less then 20 lt  option gt   lt  select gt   app directive  ngInitial   function      return       restrict   A       controller     scope     element     attrs     parse   function   scope   element   attrs   parse            val    attrs sbInitial     attrs value     element val       element text           getter    parse  attrs ngModel          setter   getter assign         setter  scope  val

User · Answer

I tried what  Mark Rajcok suggested  Its working for String values  Visa-4242   Please refer this fiddle   From the fiddle   The same thing that is done in the fiddle can be done using ng-repeat  which everybody could recommend  But after reading the answer given by  Mark Rajcok  i just wanted to try the same for a form with array of profiles  Things work well untill i have the  scope profiles            code in the controller  If i remove this code  im getting errors  But in normal scenarios i cant print  scope profiles             as i print or echo html from the server  Will it be possible to execute the above  in a similar fashion as  Mark Rajcok did for the string values like  lt input name  card description   ng-model  card description  ng-init  card description  Visa-4242   gt   without having to echo the JavaScript part from the server

User · Answer

Here is a server-centric approach    lt html ng-app  project  gt       lt script src  http   ajax googleapis com ajax libs angularjs 1 2 23 angular min js  gt  lt  script gt       lt script gt             Create your module         var dependencies               var app   angular module  project   dependencies               Create a  defaults  service         app value  defaults      your server-side JSON here                  Create a controller that uses the service         app controller  PageController   function defaults   scope                   Populate your model with the service              scope card   defaults                   lt  script gt        lt body gt           lt div ng-controller  PageController  gt               lt  -- Bind with the standard ng-model approach -- gt               lt input type  text  ng-model  card description  gt           lt  div gt       lt  body gt   lt  html gt    It s the same basic idea as the more popular answers on this question  except  provide value registers a service that contains your default values    So  on the server  you could have something like         description   Visa-4242      And put it into your page via the server-side tech of your choice  Here s a Gist  https   gist github com exclsr c8c391d16319b2d31a43

User · Answer

This is a common mistake in new Angular applications  You don t want to write your values into your HTML on the server if you can avoid it  If fact  if you can get away from having your server render HTML entirely  all the better   Ideally  you want to send out your Angular HTML templates  then pull down your values via  http in JSON and put them in your scope   So if at all possible  do this   app controller  MyController   function  scope   http         http get   getCardInfo php   function data            scope card   data                lt input type  text  ng-model  card description    gt    If you absolutely MUST render your values into your HTML from your server  you could put them in a global variable and access them with  window   In the header of your page you d write out    lt head gt      lt script gt         window card     description   foo         lt  script gt   lt  head gt    And then in your controller you d get it like so   app controller  MyController   function  scope   window        scope card    window card        I hope that helps

User · Answer

You can also use within your HTML code  ng-init  card description   12345   It is not recommended by Angular  and as mentioned above you should use exclusively your controller    But it works

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If you have the init value in the URL like mypage id  then in the controller of the angular JS you can use location pathname to find the id and assign it to the model you want

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IMHO the best solution is the  Kevin Stone directive  but I had to upgrade it to work in every conditions  f e  select  textarea   and this one is working for sure       angular module  app   directive  ngInitial   function  parse            return               restrict   A               compile  function  element   attrs                    var initialValue    attrs value     element val                    return                       pre  function  scope   element   attrs                             parse  attrs ngModel  assign  scope  initialValue

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This one is a more generic version of the ideas mentioned above    It simply checks whether there is any value in the model  and if not  it sets the value to the model   JS   function defaultValueDirective         return           restrict   A           controller                  scope     attrs     parse               function   scope   attrs   parse                    var getter    parse  attrs ngModel                   var setter   getter assign                  var value   getter                    if  value     undefined    value     null                        var defaultValueGetter    parse  attrs defaultValue                       setter  scope  defaultValueGetter                                                         HTML  usage example     lt select class  form-control          ng-options  v for  i  v  in compressionMethods          ng-model  action parameters Method          default-value   LZMA2   gt  lt  select gt

[angularjs] Angular js init ng-model from default values

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