What is Ko Purecomputed?
What is Ko Purecomputed?
Pure computed observables, introduced in Knockout 3.2. 0, provide performance and memory benefits over regular computed observables for most applications. Reduces computation overhead by not re-calculating computed observables whose value isn’t being observed. …
Is computed an observable?
That’s where computed observables come in – these are functions that are dependent on one or more other observables, and will automatically update whenever any of these dependencies change. …
What is the difference between KnockoutJS and Angular JS?
Knockout is primarily used to control UI representation in lower complexity applications, whereas Angular is a JavaScript framework that is much better suited for large, complex enterprise applications. It provides not only UI binding, but also best practices for application structure, development and testing.
How do I dispose a node in knockout?
When constructing the computed observable, provide the node using the disposeWhenNodeIsRemoved option: If a binding includes a manual subscription, this can be set to dispose automatically by calling its disposeWhenNodeIsRemoved method: When removing an element, Knockout runs logic to clean up any data associated with the element.
How do I execute code when knockout removes an element?
To solve this issue, inside of a custom binding, Knockout provides an API that lets you execute code when the element is removed by Knockout. Typically, this removal happens as part of templating or control-flow bindings ( if, ifnot, with, foreach ).
How does knockout clean up external data?
Overriding the clean-up of external data When removing an element, Knockout runs logic to clean up any data associated with the element. As part of this logic, Knockout calls jQuery’s cleanData method if jQuery is loaded in your page. In advanced scenarios, you may want to prevent or customize how this data is removed in your application.
How does knockout remove data from a jQuery page?
As part of this logic, Knockout calls jQuery’s cleanData method if jQuery is loaded in your page. In advanced scenarios, you may want to prevent or customize how this data is removed in your application. Knockout exposes a function, ko.utils.domNodeDisposal.cleanExternalData (node), that can be overridden to support custom logic.
