[SalesForce] Unable to access packaged custom labels from outside the managed package

I am able access the custom labels created in my org, using Apex, but not the custom labels from a managed package installed in my org. The documentation does not have a specific example to access namespaced custom labels in Apex. I am developing lightning components in a developer edition org (not scratch org).

I have tried the following ways:

System.Label.namespace.CustomLabelName
System.Label.namespace__CustomLabelName
Label.namespace.CustomLabelName
Label.namespace__CustomLabelName

and got the following error message:

External string does not exist: CustomLabelName

https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/labels_apex.htm

Has anybody been able to access packaged custom labels from outside the package?

Best Answer

As noted in the comments...

The correct syntax is System.Label.Namespace.CustomLabelName.

This also requires the managed CustomLabel to have protected set to false so the subscriber org can access it.

Related Solutions

[SalesForce] Can’t retrieve custom labels from community since Winter 17 Release

I've contacted Salesforce support and here is what I got so far :

I have investigated and replicated this issue on my Winter'17 Dev Org. I found that the custom label displays properly if the user language is same as that of the custom label language.

If we change the language of user to some other language than that of the custom label, we get this error.

This behavior is not happening in Summer'16 Org. Another thing I have tested is that when translation settings are turned on, it seems that the error doesn't happen.

I am escalating this further for Tier 3 attention. In the meantime, the workaround would be to make sure custom label and user language is same.

EDIT 09-22 : update from SF Support

I have got an update from Tier 3 that this is a bug that has been acknowledged by R&D. They are working on priority to release a fix which should get done by next week (safe harbor).

EDIT 09-29 : fix released

Salesforce seemed to have released the fix for that. My instance is working fine now.

[SalesForce] Lightning components: Custom label translation not working in managed package

My current workaround for this is to add a server side action (custom labels work in apex) that would return a map of all the custom labels used in the component and then set it as an attribute of type "Map". (You need to reference all custom labels anyway in order to include them in a managed package)

bottleneck: You have to make sure you load labels before doing anything else. If you have nested structure of your components and you load labels only once in the root component -> you have to manage loading of custom labels to insure the labels attribute is accessed only when it's populated.

Apex controller:

@AuraEnabled
public static Map<String,String> getCustomLabelMap(){
    Map<String,String> customLabelMap = new Map<String, String>();
    customLabelMap.put('MyCustomLabel1',Label.MyCustomLabel1);
    customLabelMap.put('MyCustomLabel2',Label.MyCustomLabel2);
    return customLabelMap;
}

Lightning Component:

<aura:handler name="init" value="{!this}" action="{!c.doInit}"/>
<aura:attribute name="LABEL" type="Map" access="private"/>

<lightning:button label="{!v.LABEL.MyCustomLabel1}" onclick="{!c.myFunction}" />

Lightning Component Controller:

({
    doInit: function (component, event, helper) {
        var action = component.get("c.getCustomLabelMap");
        action.setCallback(this, function (response) {
                var LABEL = response.getReturnValue();
                component.set("v.LABEL",LABEL);
        });
        $A.enqueueAction(action);
    },
    myFunction: function () {
        //myFunction
    }
})