I'm trying to update the label for a lightning component based on if a field is populated or not. I've tried a ton of things, and so far nothing is working (only the else statement is appearing):

<aura:attribute name="opportunity" type="Opportunity"/>
<aura:if isTrue="{or(v.opportunity.sample_id__c == null, v.opportunity.sample_id__c == '')}">
    <ui:button label="Create Sample" press="{!c.generateSampleWindow}"/>
<aura:set attribute="else">
    <ui:button label="View Sample" press="{!c.generateSampleWindow}"/>

I've also tried simply isTrue="{!v.opportunity.sample_id__c}", but also doesn't work.


2 Answers 2


You are missing the bang (!)

Do it like this:

<aura:if isTrue="{! or(v.opportunity.sample_id__c == null, v.opportunity.sample_id__c == '')}">

Also, to just check that the isTrue statement is set up properly, try defining and new attribute, say testBoolean to verify everything is working as it should (which, as you mentioned in the comments, it is not). Ie:

<aura:attribute name="testBoolean" type="Boolean" default="true"/>
<aura:if isTrue="{!v.testBoolean}">
    <div>It works!!</div>

Also, as mentioned in other answers, you can simplify your expression a lot and just calculate the value of the label.

Good luck!

  • Unfortunately this did not work, but I appreciate the response (and it seems like it should work... not sure why it isn't). Dec 8, 2017 at 20:00
  • What you need to do is check for case sensitivity, the name, the data in the name. Use a console print statement or an alert or the Javascript debugger if you can. Basically that syntax is correct, which says that something else is not. Dec 8, 2017 at 21:49

And instead of using the aura:if you can simply use the ternary inside the label of the button like this and yes you also have to fix the binding issue using !:

<aura:attribute name="opportunity" type="Opportunity"/>

label="{!(empty(v.opportunity.sample_id__c)? 'Create Sample': 'View Sample')}"

And to check for null and '', You can use the empty method.

  • Thank you for the response, unfortunately this did not work either. Dec 8, 2017 at 20:01
  • The syntax is correct, you just need to correct the attribute name. And also do share how you make it work. Dec 9, 2017 at 2:57

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