How to handle errors when using dynamic Custom Labels referencing?

Question

Any ideas how to prevent error when trying dynamically access label which doesn't exist? Check somehow whether it exists before referencing or maybe catch this error.

Here is my page:

    <apex:page Controller="MyController">
        <apex:outputText> {!$Label[label.labelName]} </apex:outputText>
    </apex:page>

And here is error:

Field $Label.myLabel does not exist. Check spelling
Error is in expression '{!$Label[label.labelName]}' in component <apex:repeat> in page pagename
Error evaluating dynamic reference 'myLabel'

Related topic: possible to access custom labels dynamically?

If the name of the label is something you solicit from the user, how about validating that at the time it is captured? Then if the label is deleted later, it's on their own head. — Matt and Neil
– Matt and Neil, Commented Jan 4, 2015 at 12:47
I tried Varun's APEX workaround in the question that was referenced by you. Unfortunately that doesn't work either, because when you input an invalid label via APEX, it throws an "Internal Salesforce Error" which cannot be caught. — Guy Clairbois
– Guy Clairbois, Commented Sep 30, 2016 at 12:05

dino ursic · Accepted Answer · 2014-01-15 14:51:06Z

0

Well, since you are already using labels as fields in the controller, why not simple render their value with a standard binding?

E.g. controller:

public class MyController
{
    public String mylabel1 {get; set;}
    public String mylabel2 {get; set;}

    public MyController()
    {
         mylabel1='label one';   
         mylabel2='label two';   
    }
}

VF page:

<apex:page Controller="MyController">
    <span> {!mylabel1} </span>
    <span> {!mylabel2} </span>
</apex:page>

Should you by any chance try to add a binding referencing a field which does not exist in the controller (e.g. mylabel3), you won't be able to save your changes as you will get Save error 'Unknown property'.

answered Jan 15, 2014 at 14:51

dino ursic

2,3431 gold badge16 silver badges21 bronze badges

4

This won't support all the features of labels, like overrides for managed packages, or language-specific translations that are automatically used based on use locale.

ca_peterson
– ca_peterson

2014-03-17 18:03:20 +00:00
Commented Mar 17, 2014 at 18:03
You can reference Labels in Apex as well. String foo = Label.myLabel;

ScottW
– ScottW

2014-09-16 19:35:57 +00:00
Commented Sep 16, 2014 at 19:35

Add a comment |

Jakub · Accepted Answer · 2025-04-12 21:01:52Z

Nowadays you can use Apex controller to get the value dynamically and catch the exception if the label doesn't exist:

Apex controller:

If you're not using a Namespace, set its value as null.

public class VFController {
    public String myLabel {
        get {
            try {
                myLabel = System.Label.get('Namespace', 'LabelName');
            } catch(System.InvalidParameterValueException exc) { // Label doesn't exist
                myLabel = 'DEFAULT_VALUE';
            } catch(Exception exc) {
                // something went really wrong, handle as you need...
            }

            return myLabel;
        }
        set;
    }
}

VF Page:

<apex:page controller="VFController">
    <apex:outputText> {!myLabel} </apex:outputText>
</apex:page>

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