In the markup of a lightning component I want to set this string a the value for a label-attribute:

"label {1}"

Let's take a lightning button as an example. But my question is unspecific and applies to any component and any string attribute. I also want to write it as an expression, to get the "...{1}" dynamically composed later. For the sake of simplicity I'm omitting that here.

Obviously this won't save

<lightning:button label="{! 'label {1}' }"  />   

So I've tried this

<lightning:button label="{! 'label &#123;1&#125;' }" />

But still I get an FIELD_INTEGRITY_EXCEPTION error while saving:

Cannot mix expression and literal string in attribute value, try rewriting like {!'foo' + v.bar}

This will save

<lightning:button label="{! 'label &#123;1' }" />

The only remaining problem is the &#125; which stands for a } right curly bracket. The parser is obviously recognizing the closing bracket as the end of the {!...} expression, while I want it to be part of the value.

Is there any way to feed such a right curly bracket character into an expression of an attribute value? Is there a way to escape it somehow?

  • 2
    Are you evaluating the expression? if not then you dont need {!}. And can directly use : <lightning:button label="label {1}" /> Commented Jan 29, 2019 at 17:32
  • else can you not have a string attribute and populate it via client side controller
    – Raul
    Commented Jan 29, 2019 at 17:37
  • @PranayJaiswal : yes, I need to evaluate the expression, because as said, it will become a dynamic value in the end...
    – Uwe Heim
    Commented Jan 29, 2019 at 19:07
  • @Raul : I know, but exactly this I would like to avoid
    – Uwe Heim
    Commented Jan 29, 2019 at 19:08
  • 1
    @javanoob PERFECT !!! this works. Post it as answer and I will accept it. Thanks so much!
    – Uwe Heim
    Commented Jan 30, 2019 at 15:06

1 Answer 1


You can replace } with unicode \u007D and it is working. I just tried.

<lightning:button label="{! 'label {1' + '\u007D'  }" />

Gives the output:

enter image description here

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