The syntax for the Expression is {!expression}. The Expression syntax can be used inside the Component Markup. Let's take a look at the following table to see the syntax for Expressions in different scenarios:
| Expression Example | Syntax | Example Code |
| Expression to reference a value from an attribute | {!v.attributeName} |
<aura:component> <aura:attribute name="searchString" type="String" default="lighnting components"/> <p>{!v.searchString}</p></aura:component> |
| Expression for calling client-side controller actions | {!c.handleClick} |
<Lightning:button label="Framework Button" onclick="{!c.handleClick}"/>The client-side JavaScript controller will be as following({ handleClick : function(component, event) { }}) |
