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When creating custom labels, you can do the following in a Lightning component (Assuming salutation = "Hello, {0}"):

{!format($Label.mySection.salutation, v.name)}

What I would like to know, is how to do this in javascript instead? I know the standard process to get the label is:

$A.get("$Label.mySection.salutation");

The part I am having trouble with is how to populate the parameter in the label?

Thanks!

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2 Answers 2

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UPDATE

I now use the following function (taken from my comment on this answer):

format : function(string) { 
    var outerArguments = arguments; 
    return string.replace(
         /\{(\d+)\}/g, 
         function() { 
             return outerArguments[parseInt(arguments[1]) + 1]; 
          }
     ); 
}

ORIGINAL ANSWER

The release notes provided for the format function are much better than the actual documentation at this point: https://releasenotes.docs.salesforce.com/en-us/spring16/release-notes/rn_lightning_labels_dynamic_params.htm

You can use $A.util.format in JavaScript to get the same effect as {!format()}.

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  • Now I use: format: function(string) { var outerArguments = arguments; return string.replace(/\{(\d+)\}/g, function() { return outerArguments[parseInt(arguments[1]) + 1]; }); },
    – techbusinessman
    Commented Dec 18, 2017 at 22:05
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We cannot use $A.util.format as it was never exposed. Apparently they made an mistake exposing the documentation. But it would be a really nice feature to have :( here is the link.

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2
  • Currently only option is to use javascript replace() function
    – Ranga
    Commented Dec 14, 2017 at 14:04
  • Correct. I use this function now: format: function(string) { var outerArguments = arguments; return string.replace(/\{(\d+)\}/g, function() { return outerArguments[parseInt(arguments[1]) + 1]; }); },
    – techbusinessman
    Commented Dec 18, 2017 at 22:05

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