July 2018
Beginner to intermediate
458 pages
9h 58m
English
Content preview from Learning Salesforce Lightning Application Development
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<aura:iteration> – multiple items set
If you see the following warning message in the browser console, this occurs if your component sets the items attribute of an <aura:iteration> tag multiple times in the same rendering cycle:
"WARNING: [Performance degradation] markup://aura:iteration [id:5:0] in c:iterationMultipleItemsSet ["3:0"] had multiple items set in the same Aura cycle"
The following code shows how <indexentry content="events strategy: tag"> you can generate performance degradation when using aura:iteration.
<!--c:iterationMultipleItemsSet--><aura:component> <aura:attribute name="sports" type="List" default="[ 'Cricket', 'Tennis', 'Football' ]"/> <aura:handler name="init" value="{!this}" action="{!c.init}"/> <aura:iteration ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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