ng repeat repeats more times than array length

[Erivan junior]

Hello everybody,

i have a problem and i need your help!

for example i have a object 
$scope.values= [

{group :'a',  value:1 },

{group :'a',  value:2 },

{group :'b',  value:3 },

{group :'a',  value:4 },

]

and i use the ng-if to verify if i show the group

<div>
 ng-repeat=" val in values"

  <div ng-if="show(val.group)">  

     {{val.group}}

   </div>

   <div>  {{val.value}}</div>

 

</div>
and in controller i have function called show

var verifay = '';
$scope.show = function (val) {
  if(verify == val){

         return false;

  }else{

       verifay = val;

        return true;

  }
}

but this not work because de function show is called  more times than array length, anybody can help me?

[Sander Elias]

Hi Erivan,

This is not a problem with the ngRepeat. Its part of how angular works. You can't do what you are doing

in this way.

the ngIf will gets evaluated on every digest cycle. If there is a change in the models data anywhere, that

will cause a new digest cycle. You can't predict the number of evaluation cycles from within your own code.

If you use a function in a conditional directive (ngIf/ngSwitch/ngShow/ a few others) it must be a function

with no side effects and it needs to return the same result for the same argument every time. 

This is also known as a pure function.

If you build a plunker arround your problem, I can help you at a bit more if you want.

Does this answer your question?

Regards

Sander.

[Erivan junior]

Thanks Sander,

i use the $index for know when i have to "restart" my function.

more one time thank you!

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Atenciosamente,

Erivan Rodrigues Gonzaga Junior

[Erivan junior]

and i do this http://plnkr.co/edit/hpYkZzbAteskjJznJ1t3?p=preview