I know that we cannot assign expressions to the aura : id. It should be hard coded string literal, as per the salesforce documentation. Also, we cannot use html Id, as document.getElementById is no more supported. I saw some posts related to this where it was suggested to dynamically create the component. But that go well with the below scenario. Is there any workaround for this ? Basically i have a checkbox and a text inside an iteration element, in a lightning component. when the checkbox is checked, i want to strike out the corresponding text. Below is the code snippet.

Component :

<aura:iteration items="{!v.somelist}" var="val"> 
   <input name="checkbox" type="checkbox" id="{!val.id}" onclick="{!c.somefunction}"/>
   <a id="{!val.id}"> some text </a>

Controller :

somefunction: function(component, event, helper) {
    var id = event.target.id;
    // is there a way, i can get the anchor tag element and add the css 
    class strikeText to it ?    


.THIS .strikeText{

Appreciate any help on this.

  • This statement we cannot use html Id, as document.getElementById is no more supported is not true. you can use document.getElementById and other supported DOM API in Lightnig component.
    – Praveen
    Sep 12, 2017 at 7:02
  • I get the undefined value when trying to access by document.getElementById. Post locker service, this does not seems to be working.
    – Yashmith
    Sep 12, 2017 at 7:09
  • Just now checked in my dev org. document.getElementById() works for me with locker in place.
    – Praveen
    Sep 12, 2017 at 7:19
  • Thats true Praveen, It does work. It was some problem with the id and i had to append another character to it, to get it work. Thanks.
    – Yashmith
    Sep 12, 2017 at 10:04

1 Answer 1


You can add custom html attributes to your checkbox. For example:

<input name="checkbox" type="checkbox" onclick="{!c.somefunction}" 
 data-anchorId="{!val.Id}" />

Then in your controller, you can use the document.getElementById() Javascript function to find the anchor depending on your custom attribute:

var anchorId = event.target.getAttribute("data-anchorId");
var anchor = document.getElementById(anchorId);
anchor.className += " strikeText";
  • Thanks for your response Martin. The DOM which i get by event.target is the checkbox element. However, i need to add the css class to the anchor tag, which has the value "Some Text". Any suggestions on this ?
    – Yashmith
    Sep 12, 2017 at 7:16
  • @Yashmith Sorry I didn't understand. I updated my answer. Sep 12, 2017 at 7:23

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