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I have two attribute in lightning component. one is List and second is Integer attribute and I want to pass dynamic value of list.

< aura:attribute name = "index" type ="Integer" />

< aura:attribute name = "DataList" type ="List" />  

< c:myChild_CMP obj="{!v.DataList[index]}" /> 

//getting Error here
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You can't access a dynamic element this way. Instead, you could write another attribute and use that as the value to bind to:

<aura:attribute name="indexData" type="Object" />
<aura:handler name="change" value="{!v.index}" action="{!updateIndexData}" />
<aura:handler name="change" value="{!v.DataList}" action="{!updateIndexData}" />
...
<c:myChild_CMP obj="{!v.indexData}" />

updateIndexData: function(component, event, helper) {
    var dataList = component.get("v.DataList"),
        index = component.get("v.index"),
        data = dataList && index >= 0? dataList[index]: null;
    component.set("v.indexData", data);
},

  • I want to get dynamic value of DataList on component level, because I have some input data which I have to store in the DataList. Is there any way to access the DataList directly in component using index ? – user2202077 Jul 15 at 8:38
  • @user2202077 Yes, but you cannot. You will need to use either aura:iteration, an attribute as shown here, or something else. – sfdcfox Jul 15 at 8:41
  • @user2202077 As long as they're all in the same namespace, this solution should work, I believe, and other solutions, such as using aura:iteration, should also work. Or, come up with an entirely different solution. The point is, you can't access an index dynamically. Your question is itself an x-y problem. Accessing a dynamic index directly is impossible. – sfdcfox Jul 15 at 9:07

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