Lightning Components Developer’s Guide

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Working with Attribute Values in JavaScript

These are useful and common patterns for working with attribute values in JavaScript.

Example

In these examples, cmp is a reference to a component in your JavaScript code. It’s usually easy to get a reference to a component in JavaScript code.

Get an Attribute Value

To get the value of a component’s label attribute:

1var label = cmp.get("v.label");

Set an Attribute Value

To set the value of a component’s label attribute:

1cmp.set("v.label","This is a label");

Get a Boolean Attribute Value

To get the boolean value of a component’s myString attribute:

1var myString = $A.util.getBooleanValue(cmp.get("v.myString"));
For example, the following attribute returns true when passed into $A.util.getBooleanValue().
1<aura:attribute name="myString" type="String" default="my string"/>
If the attribute is of type Boolean, cmp.get("v.myBoolean") returns the boolean value and $A.util.getBooleanValue() is not needed.

Validate that an Attribute Value is Defined

To determine if a component’s label attribute is defined:

1var isDefined = !$A.util.isUndefined(cmp.get("v.label"));

Validate that an Attribute Value is Empty

To determine if a component’s label attribute is empty:

1var isEmpty = $A.util.isEmpty(cmp.get("v.label"));