AngularJS - Binding radio buttons to models with boolean values

Question

I am having a problem binding radio buttons to an object whose properties have boolean values  I am trying to display exam questions retrieved from a  resource   HTML    lt label data-ng-repeat  choice in question choices  gt     lt input type  radio  name  response  data-ng-model  choice isUserAnswer  value  true    gt      choice text    lt  label gt    JS    scope question         questionText   This is a test question        choices                 id  1              text   Choice 1               isUserAnswer  false                          id  2              text   Choice 2               isUserAnswer  true                          id  3              text   Choice 3               isUserAnswer  false                    With this example object  the  isUserAnswer  true  property does not cause the radio button to be selected  If I encapsulate the boolean values in quotes  it works   JS    scope question         questionText   This is a test question        choices                 id  1              text   Choice 1               isUserAnswer   false                           id  2              text   Choice 2               isUserAnswer   true                           id  3              text   Choice 3               isUserAnswer   false                     Unfortunately my REST service treats that property as a boolean and it will be difficult to change the JSON serialization to encapsulate those values in quotes  Is there another way to set up the model binding without changing the structure of my model   Here s the jsFiddle showing non-working and working objects

User · Answer

lt label class  rate-hit  gt        lt input type  radio  ng-model  st result  ng-value  true  ng-checked  st result  gt       Hit   lt  label gt    amp nbsp  amp nbsp    lt label class  rate-miss  gt        lt input type  radio  ng-model  st result  ng-value  false  ng-checked   st result  gt       Miss   lt  label gt

User · Answer

The way your radios are set up in the fiddle - sharing the same model - will cause only the last group to show a checked radio if you decide to quote all of the truthy values   A more solid approach will involve giving the individual groups their own model  and set the value as a unique attribute of the radios  such as the id    scope radioMod   1   scope radioMod2   2    Here is a representation of the new html    lt label data-ng-repeat  choice2 in question2 choices  gt               lt input type  radio  name  response2  data-ng-model  radioMod2  value    choice2 id     gt                    choice2 text            lt  label gt    And a fiddle

User · Answer

That s an odd approach with isUserAnswer   Are you really going to send all three choices back to the server where it will loop through each one checking for isUserAnswer    true   If so  you can try this   http   jsfiddle net hgxjv 4   HTML    lt input type  radio  name  response  value  true  ng-click  setChoiceForQuestion question1  choice    gt    JavaScript    scope setChoiceForQuestion   function  q  c        angular forEach q choices  function  c            c isUserAnswer   false               c isUserAnswer   true       Alternatively  I d recommend changing your tack   http   jsfiddle net hgxjv 5    lt input type  radio  name  response  value    choice id    ng-model  question1 userChoiceId   gt    That way you can just send   question1 userChoiceId   back to the server

User · Answer

if you are using boolean variable to bind the radio button  please refer below sample code   lt div ng-repeat  book in books  gt    lt input type  radio  ng-checked  book selected    ng-click  function  event   gt                           lt  div gt

User · Answer

The correct approach in Angularjs is to use ng-value for non-string values of models   Modify your code like this    lt label data-ng-repeat  choice in question choices  gt     lt input type  radio  name  response  data-ng-model  choice isUserAnswer  data-ng-value  true    gt      choice text    lt  label gt    Ref  Straight from the horse s mouth

User · Answer

I tried changing value  true  to ng-value  true   and it seems to work    lt input type  radio  name  response2  data-ng-model  choice isUserAnswer  ng-value  true    gt   Also  to get both inputs to work in your example  you d have to give different name to each input -- e g  response should become response1 and response2

User · Answer

You might take a look at this   https   github com michaelmoussa ng-boolean-radio   This guy wrote a custom directive to get around the issue that  true  and  false  are strings  not booleans

[angularjs] AngularJS - Binding radio buttons to models with boolean values

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