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I've been working with developing a stand-alone app in lightning. In trying to adhere to the look and feel I'm following the html layed out in https://www.lightningdesignsystem.com/components/tabs. Sorry if this is a newb question how do I manipulate the class of the <a> being clicked to .slds-active and it's corresponding <div> to .slds-show , and then remove any other existing <a> with the .slds-active and change the <div> to .sld.slds-hide?  I've seen something similiar with javascript on a visualforce page but I wanted to follow the component design structure. Surely someone has done this as it seems pretty standard navigation. Currently my component has

<div class="slds-tabs--default">
 <ul class="slds-tabs--default__nav" role="tablist">
   <li class="slds-tabs--default__item slds-text-heading--label slds-active" title="Item One" role="presentation">
   <a class="slds-tabs--default__link" href="#void" role="tab" tabindex="0" aria-selected="true" aria-controls="tab-default-1" data-data="tab-default-1__item"  onclick="{!c.selectTab}" id="tab-default-1__item">New Checklists</a>
        </li>
  <li class="slds-tabs--default__item slds-text-heading--label" title="Item Two" role="presentation">
            <a class="slds-tabs--default__link" href="#void" role="tab" tabindex="-1" aria-selected="false" aria-controls="tab-default-2" data-data="tab-default-2__item" onclick="{!c.selectTab}" id="tab-default-2__item">Existing Checklist</a>
        </li>
      </ul>
      <div id="tab-default-1" class="slds-tabs--default__content slds-show" role="tabpanel" aria-labelledby="tab-default-1__item">
        <h2>Item One Content</h2>
      </div>
      <div id="tab-default-2" class="slds-tabs--default__content slds-hide" role="tabpanel" aria-labelledby="tab-default-2__item">
        <h2>Item Two Content</h2>
      </div>

    </div>

I have the onClick="{!c.selectTab}" which goes to my js controller. Below

selectTab : function(component, event, helper){
    	var activeTab;
        activeTab = event.target.getAttribute("id");
        //var result = component.find("tab-default-1__item");
        //alert(result);
  
    },

I see the event.target.getAttribute gives me the value of the onclick id. I can get the value and can then tell which tab was clicked, but then how do I 

1. Change the class value of that Id?
2. Change the class value of other id's?

I've been trying to use various javascript  functions like find but nothing seems to be working. Can someone point me to which functions I should be using to find id(DOMS) on a component and which functions can be used to set vairous attributes?  I didn't find anything in the lightning dev guide but will keep looking. Any help is appreciated.
 

Hi Developers,

Can anyone help me on this issue, I have a Child object that has a Lookup to Parent. I wrote the below apex class and the trigger on child, such that the count of Child records should be shown on each Parent record. I have a number field on the Parent which should be update as per the Trigger.

It works fine except in one scenario, it does not consider the existing Child records on the Parent, hence it shows incorrect count on the Parent record. It works perfect if I add the new Child records. I heard that Batch Apex can resolve this issue, I am not sure how Batch Apex is related here to resolve the isssue. Can I get some guidance here to proceed further.


Any help on this is much appreciated.
Thank you.

Apex Class:

public class ChildCountHelper{
    
    //List<Parent__c> parentList = [select id, child_count__c, (select id from child__r) from Parent__c where id in :parentIDSet];
    
    public List<ID> conList= new List<ID>();
    
    public static void handleBeforeInsert(List<Child__c> childList){
        Set<ID> parentIDSet = new Set<ID>();
        
        for(Child__c childRec: childList){
     
            parentIDSet.add(childRec.Parent__c);
            
        }
        
        Map<ID, Parent__c> parentMap = new map<ID, parent__c>([select id, child_count__c from Parent__c where id in :parentIDSet]);
        for(Child__c childRec: childList){
            if(parentMap.get(childRec.Parent__c).child_count__c == null){
                parentMap.get(childRec.Parent__c).child_count__c = 0;
            }
            parentMap.get(childRec.Parent__c).child_count__c ++;
        }
        update parentMap.values();
    }
    
    public static void handleBeforeUpdate(List<Child__c> newChildList, List<Child__c> oldChildList){
        Set<ID> parentIDSet = new Set<ID>();
        Map<ID, ID> oldChildMap = new Map<ID, ID>();
        
        for(Child__c childRec: newChildList){
            parentIDSet.add(childRec.Parent__c);
        }
        
        for(Child__c childRec: oldChildList){
            parentIDSet.add(childRec.Parent__c);
            oldChildMap.put(childRec.Id, childRec.Parent__c);
        }
        
        Map<ID, Parent__c> parentMap = new map<ID, parent__c>([select id, child_count__c from Parent__c where id in :parentIDSet]);
        for(Child__c childRec: newChildList)
       {
        /*if(ChildRec.Parent__c!=null){  */
            if(parentMap.get(childRec.Parent__c).child_count__c == null){
                parentMap.get(childRec.Parent__c).child_count__c = 0;
            }
           // }
            if(childRec.Parent__c != oldChildMap.get(childRec.id)){
                if(oldChildMap.get(childRec.id) == null && childRec.Parent__c != null){
                    parentMap.get(childRec.Parent__c).child_count__c ++;
                }else if(oldChildMap.get(childRec.id) != null && childRec.Parent__c == null){
                    parentMap.get(oldChildMap.get(childRec.id)).child_count__c --;
                }else if(oldChildMap.get(childRec.id) != null && childRec.Parent__c != null){
                    parentMap.get(oldChildMap.get(childRec.id)).child_count__c --;
                    parentMap.get(childRec.Parent__c).child_count__c ++;
                }
            }
            
        }
        update parentMap.values();
    }
    
    public static void handleBeforeDelete(List<Child__c> childList){
        Set<ID> parentIDSet = new Set<ID>();
        for(Child__c childRec: childList){
            parentIDSet.add(childRec.Parent__c);
        }
        
        Map<ID, Parent__c> parentMap = new map<ID, parent__c>([select id, child_count__c from Parent__c where id in :parentIDSet]);
        for(Child__c childRec: childList){
            if(parentMap.get(childRec.Parent__c).child_count__c == null){
                parentMap.get(childRec.Parent__c).child_count__c = 0;
            }
            parentMap.get(childRec.Parent__c).child_count__c --;
        }
        update parentMap.values();
    }
    
    public static void handleBeforeUnDelete(List<Child__c> childList){
        Set<ID> parentIDSet = new Set<ID>();
        for(Child__c childRec: childList){
            parentIDSet.add(childRec.Parent__c);
        }
        
        Map<ID, Parent__c> parentMap = new map<ID, parent__c>([select id, child_count__c from Parent__c where id in :parentIDSet]);
        for(Child__c childRec: childList){
            if(parentMap.get(childRec.Parent__c).child_count__c == null){
                parentMap.get(childRec.Parent__c).child_count__c = 0;
            }
            parentMap.get(childRec.Parent__c).child_count__c ++;
        }
        update parentMap.values();
    }

}




Trigger:


trigger ChildTrigger on Child__c (before insert, after update, after delete, after undelete) {
    if (Trigger.isInsert) {
        ChildCountHelper.handleBeforeInsert((List<Child__c>)Trigger.NEW);
    }else if (Trigger.isUpdate) {
        ChildCountHelper.handleBeforeUpdate((List<Child__c>)Trigger.NEW, (List<Child__c>)Trigger.OLD);
    }else if (Trigger.isDelete) {
        ChildCountHelper.handleBeforeDelete((List<Child__c>)Trigger.OLD);
    }else if (Trigger.isUndelete) {
        ChildCountHelper.handleBeforeUnDelete((List<Child__c>)Trigger.NEW);
    }
}