How to handle errors when using dynamic Custom Labels referencing?

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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 errror:

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?

Answer

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’.

Attribution
Source : Link , Question Author : dika90 , Answer Author : dino ursic

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