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Activity › Forums › Salesforce® Discussions › What are Local and Global ids with respect to Salesforce Lightning Component?

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  • shariq

    Member
    September 23, 2018 at 11:19 PM

    Component IDs
    A component has two types of IDs: a local ID and a global ID. You can retrieve a component using its local ID in your JavaScript code. A global ID can be useful to differentiate between multiple instances of a component or for debugging purposes.

    Local IDs
    A local ID is an ID that is only scoped to the component. A local ID is often unique but it’s not required to be unique.
    Create a local ID by using the aura:id attribute. For example:
    Find the button component by calling cmp.find(“button1”) in your client-side controller, where cmp is a reference to the component containing the button.

    Global IDs
    Every component has a unique globalId, which is the generated runtime-unique ID of the component instance. A global ID (1) is not guaranteed to be the same beyond the lifetime of a component, so it should never be relied on. A global ID can be useful to differentiate between multiple instances of a component or for debugging purposes.

  • Parul

    Member
    September 23, 2018 at 11:32 PM

    Every component has a unique globalId, which is the generated run=me-­‐unique  ID of the component instance.

    • A  global  ID is not guaranteed to be the same beyond the life=me of a component, so it should never be relied on.
    • To create a unique ID for an HTML element, use the globalId as a prefix or suffix for the element.
    • Use  the  getGlobalId() function in JavaScript to get a component's global  ID.
    • Get a component from its global ID.

    <div  id="{!globalId  +  '_footer'}"></div>
    var  cmp  =  $A.getComponent(globalId);
    var  globalId  =  cmp.getGlobalId();

  • Avnish Yadav

    Member
    September 25, 2018 at 6:17 AM

    Hello,

    A component has two types of IDs: a local ID and a global ID.
    You can retrieve a component using its local ID in your JavaScript code.
    A global ID can be useful to differentiate between multiple instances of a component or for debugging purposes.
    Local ID is created by using the aura:id attribute.
    example
    To find the local ID for a component in JavaScript, use cmp.getLocalId()
    Every component has a unique globalId, which is the generated runtime-unique ID of the component instance.
    A global ID is not guaranteed to be the same beyond the lifetime of a component, so it should never be relied on

    Thanks

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