Lightning Component Attribute (aura:attribute) are like member variables on a class in Apex. <aura:attribute>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.
Full Answer
What are component attributes in Salesforce?
Component attributes are like member variables on a class in Apex. They are typed fields that are set on a specific instance of a component, and can be referenced from within the component's markup using an expression syntax.
How do you make a lightning component more accessible?
One critical piece of accessibility is the use of the title attribute. Screen readers read title attribute values to a user. When you consume a Lightning web component with a title attribute, always specify a value. For example, the lightning-button component has a title attribute.
How do I get and set values in a lightning-button?
When using a lightning-button component, you write: The component defines the ARIA attributes as public properties, and uses fields to get and set the public properties. The component JavaScript uses the camel-case attribute mappings to get and set the values in lightning-button.js.
How do I get the HTML output of a lightning component?
When you consume a Lightning web component with a title attribute, always specify a value. For example, the lightning-button component has a title attribute. That template creates HTML output like the following for the screen reader to read out “Log In” to the user.
What attribute mappings does lightning button use?
The component JavaScript uses the camel-case attribut e mappings to get and set the values in lightning-button.js.
How to link ARIA attributes?
Currently, linking IDs and ARIA attributes requires you to bind the values in a callback on the custom event that’s dispatched in renderedCallback(). To get the rendered ID value on the div element, retrieve it in renderedCallback(). The aria-labelledby attribute is manually set using setAttribute() because it doesn’t support dynamic values.
When you take control of an attribute by exposing it as a public property, the attribute no longer appears in the?
When you take control of an attribute by exposing it as a public property, the attribute no longer appears in the HTML output by default. To pass the value through to the rendered HTML as an attribute (to reflect the property), define a getter and setter for the property and call the setAttribute() method.
How to prevent a consumer from changing an attribute's value?
To prevent a consumer from changing an attribute’s value, simply return a string. This example always returns "button" for the role value.
Do ARIA attributes have to be linked?
IDs and ARIA attributes in the same template are linked automatically. If attributes are in different templates, you must link them manually.
Can you assign ARIA attributes to HTML?
You can assign ARIA attributes to id attributes in your HTML template. In a component’s template file, id values must be unique so that screen readers can associate ARIA attributes such as aria-describedby, aria-details, and aria-owns with their corresponding elements.
How to set value of inherited attribute?
To set the value of an inherited attribute, use the <aura:set> tag. Setting the body content is equivalent to wrapping that free markup inside <aura:set attribute="body">. Since the body attribute has this special behavior, you can omit <aura:set attribute="body">.
How to access component body in JavaScript?
To access a component body in JavaScript, use component.get ( "v.body").