I'm trying to change the icon of a lightning button icon but the image isn't changing however I see that the attribute is being updated.


2 Answers 2


setAttribute is for setting HTML attributes. For component attributes, use direct assignment:


If you use query selectors, just remember that if it's not an HTML component, use the direct assignment method.

  • 1
    Interesting, I did not know that! Dec 24, 2019 at 2:58

Using track variable is another way to go.

In the javascript controller

@track iconname = 'DefaultIconName';

  this.iconname = 'NewIconName';

In the html template file

<lightning-icon icon-name={iconname}></lightning-icon>
  • 1
    +1, but note: @track is no longer necessary for shallow references, such as a string variable in your answer. You only need to track objects and arrays if you want them to be reactive.
    – sfdcfox
    Feb 14, 2021 at 0:47

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