How to create data binding between component values?
When you add a component in markup, you can use an expression to initialize attribute values in the component based on attribute values of the container component. There are two forms of expression syntax, which exhibit different behaviors for data binding between the components.
How to bind child component to parent component?
Consider a c:parent component that has a parentAttr attribute. c:parent contains a c:child component with a childAttr attribute that’s initialized to the value of the parentAttr attribute.
How to bind two components in Lightning aura?
When you instantiate the wrapped component in the wrapper component, initialize the attribute value instead of initializing the attribute in the wrapped component’s client-side controller. Now, let’s update the code to use a bound expression instead. Change this line in c:parentExpr: In the Developer Console, click Update Preview for c:exprApp.
When to use bi-directional data binding between components?
Bi-directional data binding is expensive for performance and it can create hard-to-debug errors due to the propagation of data changes through nested components. We recommend using the {#expression} syntax instead when you pass an expression from a parent component to a child component unless you require bi-directional data binding.
How does data binding between components work in Salesforce?
However, change handlers in the parent aren’t notified. The same behavior applies for changes in the parent propagating to the child. Data updates in either component are reflected through bidirectional data binding in both components.
When to use a bound expression in a component?
You can configure a component to automatically invoke a change handler, which is a client-side controller action, when a value in one of the component’s attributes changes. When you use a bound expression, a change in the attribute in the parent or child component triggers the change handler in both components.
How does data binding work in razor component?
Razor components provide data binding features via an HTML element attribute named @bind with a field, property, or Razor expression value. The following example binds an element to the currentValue field and an element to the CurrentValue property: When one of the elements loses focus, its bound field or property is updated.
How to create custom binding in ASP.NET Core?
C# get and set accessors can be used to create custom binding format behavior, as the following DecimalBinding component demonstrates. The component binds a positive or negative decimal with up to three decimal places to an element by way of a string property ( DecimalValue ).