Substring Helper Function in HTML not working | Community
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montezh2001
Level 4
September 8, 2025
Solved

Substring Helper Function in HTML not working

  • September 8, 2025
  • 1 reply
  • 245 views

Hello, 

 

I have the following code in my HTML I'm trying to use. This code looks for a Campaign Name attribute and applies the corresponding couponID. However, when I try to save this code, I get an "invalid helper substr" error. 

 

{{#each profile._*********.walletInfo.couponDetails as |coupon|}} {%#if contains(coupon.campaignName,"NA_EM_2025_Coupon_Launch" ) %} {% substr(coupon.couponId,38) %} {%else%} No Valid Coupon Available {%/if%}{{/each}}
 
Please advise
 
Best answer by SatheeskannaK

@montezh2001 the substr function is missing the syntax. try along these lines,

{{#each profile._*********.walletInfo.couponDetails as |coupon|}}
{%#if contains(coupon.campaignName,"NA_EM_2025_Coupon_Launch") %}
{%= substr(coupon.couponId,0,2) %}
{%else%} No Valid Coupon Available {%/if%}
{{/each}}

 

1 reply

SatheeskannaK
Community Advisor
SatheeskannaKCommunity AdvisorAccepted solution
Community Advisor
September 8, 2025

@montezh2001 the substr function is missing the syntax. try along these lines,

{{#each profile._*********.walletInfo.couponDetails as |coupon|}}
{%#if contains(coupon.campaignName,"NA_EM_2025_Coupon_Launch") %}
{%= substr(coupon.couponId,0,2) %}
{%else%} No Valid Coupon Available {%/if%}
{{/each}}

 

Thanks, Sathees
M
MontexHo
Level 2
September 8, 2025

Thank you @satheeskannak .

 

This worked, despite the documentation stating having the ending index is an option. 

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