how to hide a component if all sub-components are hidden ngIf












1















For example consider the code:



<div *ngIf="-------NOTEMPTY-------">

  Parent

  <div *ngFor = 'let child of offsprings'>

    <div name="c1" *ngIf="conditions[child.name]">

      Child0

    </div>

  </div>

</div>


I want Parent division's ngIf to be false if all its child divisions' ngIf are false.



Note : It is not possible to me to collect all the child conditions in the ts file.






javascript angular typescript ngif







share|improve this question

























  • offsprings.every(c => !c.condition)

    – bugs
    Nov 21 '18 at 10:13
















1















For example consider the code:



<div *ngIf="-------NOTEMPTY-------">

  Parent

  <div *ngFor = 'let child of offsprings'>

    <div name="c1" *ngIf="conditions[child.name]">

      Child0

    </div>

  </div>

</div>


I want Parent division's ngIf to be false if all its child divisions' ngIf are false.



Note : It is not possible to me to collect all the child conditions in the ts file.






javascript angular typescript ngif







share|improve this question

























  • offsprings.every(c => !c.condition)

    – bugs
    Nov 21 '18 at 10:13














1












1








1








For example consider the code:



<div *ngIf="-------NOTEMPTY-------">

  Parent

  <div *ngFor = 'let child of offsprings'>

    <div name="c1" *ngIf="conditions[child.name]">

      Child0

    </div>

  </div>

</div>


I want Parent division's ngIf to be false if all its child divisions' ngIf are false.



Note : It is not possible to me to collect all the child conditions in the ts file.






javascript angular typescript ngif







share|improve this question
















For example consider the code:



<div *ngIf="-------NOTEMPTY-------">

  Parent

  <div *ngFor = 'let child of offsprings'>

    <div name="c1" *ngIf="conditions[child.name]">

      Child0

    </div>

  </div>

</div>


I want Parent division's ngIf to be false if all its child divisions' ngIf are false.



Note : It is not possible to me to collect all the child conditions in the ts file.






javascript angular typescript ngif




javascript angular typescript ngif






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 21 '18 at 10:46

























asked Nov 21 '18 at 10:10







user8401765




















  • offsprings.every(c => !c.condition)

    – bugs
    Nov 21 '18 at 10:13



















  • offsprings.every(c => !c.condition)

    – bugs
    Nov 21 '18 at 10:13

















offsprings.every(c => !c.condition)

– bugs
Nov 21 '18 at 10:13





offsprings.every(c => !c.condition)

– bugs
Nov 21 '18 at 10:13












2 Answers
2






active

oldest

votes


















1














Try adding in the Parent *ngIf condition 



!offsprings.every(child => !conditions[child.name]);





share|improve this answer


























  • Edited the answer to search the condition in the conditions map

    – Nil Llisterri
    Nov 21 '18 at 11:00



















0














Used a function call as *ngIf = checkIfExists() on parent.



<div *ngIf="checkIfExists()">

  Parent with children existing

  <div *ngFor = 'let child of offsprings'>

    <div name="c1" *ngIf="conditions[child.name]">

      Child0 {{conditions[child.name]}}

    </div>

  </div>

</div>


Function For Parent ngIf:
Appraoch is to traverse every element of offsprings array,
and check if conditions[child.name] exists.



checkIfExists() {

  let ifDefined: boolean;

    this.offsprings.forEach(e=> {

      if (this.conditions[e.name]) {

        ifDefined = true;

      } 

    });

    return ifDefined;

}


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    2 Answers
    2






    active

    oldest

    votes








    2 Answers
    2






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    1














    Try adding in the Parent *ngIf condition 



    !offsprings.every(child => !conditions[child.name]);





    share|improve this answer


























    • Edited the answer to search the condition in the conditions map

      – Nil Llisterri
      Nov 21 '18 at 11:00
















    1














    Try adding in the Parent *ngIf condition 



    !offsprings.every(child => !conditions[child.name]);





    share|improve this answer


























    • Edited the answer to search the condition in the conditions map

      – Nil Llisterri
      Nov 21 '18 at 11:00














    1












    1








    1







    Try adding in the Parent *ngIf condition 



    !offsprings.every(child => !conditions[child.name]);





    share|improve this answer















    Try adding in the Parent *ngIf condition 



    !offsprings.every(child => !conditions[child.name]);






    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited Nov 21 '18 at 10:56

























    answered Nov 21 '18 at 10:13









    Nil LlisterriNil Llisterri

    452516




    452516













    • Edited the answer to search the condition in the conditions map

      – Nil Llisterri
      Nov 21 '18 at 11:00



















    • Edited the answer to search the condition in the conditions map

      – Nil Llisterri
      Nov 21 '18 at 11:00

















    Edited the answer to search the condition in the conditions map

    – Nil Llisterri
    Nov 21 '18 at 11:00





    Edited the answer to search the condition in the conditions map

    – Nil Llisterri
    Nov 21 '18 at 11:00













    0














    Used a function call as *ngIf = checkIfExists() on parent.



    <div *ngIf="checkIfExists()">
    
  Parent with children existing
    
  <div *ngFor = 'let child of offsprings'>
    
    <div name="c1" *ngIf="conditions[child.name]">
    
      Child0 {{conditions[child.name]}}
    
    </div>
    
  </div>
    
</div>


    Function For Parent ngIf:
    Appraoch is to traverse every element of offsprings array,
    and check if conditions[child.name] exists.



    checkIfExists() {
    
  let ifDefined: boolean;
    
    this.offsprings.forEach(e=> {
    
      if (this.conditions[e.name]) {
    
        ifDefined = true;
    
      } 
    
    });
    
    return ifDefined;
    
}


    StackBlitz Working Demo






    share|improve this answer




























      0














      Used a function call as *ngIf = checkIfExists() on parent.



      <div *ngIf="checkIfExists()">
      
  Parent with children existing
      
  <div *ngFor = 'let child of offsprings'>
      
    <div name="c1" *ngIf="conditions[child.name]">
      
      Child0 {{conditions[child.name]}}
      
    </div>
      
  </div>
      
</div>


      Function For Parent ngIf:
      Appraoch is to traverse every element of offsprings array,
      and check if conditions[child.name] exists.



      checkIfExists() {
      
  let ifDefined: boolean;
      
    this.offsprings.forEach(e=> {
      
      if (this.conditions[e.name]) {
      
        ifDefined = true;
      
      } 
      
    });
      
    return ifDefined;
      
}


      StackBlitz Working Demo






      share|improve this answer


























        0












        0








        0







        Used a function call as *ngIf = checkIfExists() on parent.



        <div *ngIf="checkIfExists()">
        
  Parent with children existing
        
  <div *ngFor = 'let child of offsprings'>
        
    <div name="c1" *ngIf="conditions[child.name]">
        
      Child0 {{conditions[child.name]}}
        
    </div>
        
  </div>
        
</div>


        Function For Parent ngIf:
        Appraoch is to traverse every element of offsprings array,
        and check if conditions[child.name] exists.



        checkIfExists() {
        
  let ifDefined: boolean;
        
    this.offsprings.forEach(e=> {
        
      if (this.conditions[e.name]) {
        
        ifDefined = true;
        
      } 
        
    });
        
    return ifDefined;
        
}


        StackBlitz Working Demo






        share|improve this answer













        Used a function call as *ngIf = checkIfExists() on parent.



        <div *ngIf="checkIfExists()">
        
  Parent with children existing
        
  <div *ngFor = 'let child of offsprings'>
        
    <div name="c1" *ngIf="conditions[child.name]">
        
      Child0 {{conditions[child.name]}}
        
    </div>
        
  </div>
        
</div>


        Function For Parent ngIf:
        Appraoch is to traverse every element of offsprings array,
        and check if conditions[child.name] exists.



        checkIfExists() {
        
  let ifDefined: boolean;
        
    this.offsprings.forEach(e=> {
        
      if (this.conditions[e.name]) {
        
        ifDefined = true;
        
      } 
        
    });
        
    return ifDefined;
        
}


        StackBlitz Working Demo







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Nov 21 '18 at 11:41









        Abhishek KumarAbhishek Kumar

        1,214417




        1,214417






























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