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How to use Promise in Lightning Component?
Promises execute their resolve and reject functions asynchronously so the code is outside the Lightning event loop and normal rendering lifecycle. If the resolve or reject code makes any calls to the Lightning Component framework, such as setting a component attribute, use $A. getCallback() to wrap the code.
What is Promise in salesforce?
Promises simplify code by handling the success or failure of asynchronous calls and allowing operations to be chained together. For the most part, promises are usually used for callouts to get data or do an operation on data (CRUD, etc) or do some other operation through apex or the Force.com platform.
What is Promise in lwc?
Promise in LWC works the same as it does in the simple JavaScript file. Promises is essentially a replacement for callback methods in JavaScript. If there are callbacks inside a callback and so on, it produces the issue known as Callback Hell. The solution to this is nothing but the Promise.
How are components attributes used in Lightning app?
Lightning Components attributes are used to: Pass information from one component to another component. Pass information from an app to a component. Pass information from an url query string to an app. Hold information that is dynamically changed (eg: through javascript) and which is dynamically referenced within an app or component.
Why do we use V in Lightning components?
Because “v” represents the view, which is built by a set of attributes. Also, we will be able of reading and manipulating the attribute values through javascript. The properties name and type are compulsory for an attribute. Optionally we can indicate a description, a default value and if the attribute is required.
How to add attribute to lightning component in apex?
Lightning Component Attribute (aura:attribute) are like member variables on a class in Apex. tag is used to add an attribute to the lightning component and Salesforce lightning App. Each attribute must have “name” and “type“. To make attribute as required use required=”true” in the tag.
When to use whom attribute in Lightning aura?
In this case we’ve got an attribute named whom of type String. If no value is specified, it defaults to “world”. Though not a strict requirement, tags are usually the first things listed in a component’s markup, as it provides an easy way to read the component’s shape at a glance.