aurelia-getter-throttle
v1.0.5
Published
Throttle getter to make Aurelia rendering efficient
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aurelia-getter-throttle
Throttle getter to make Aurelia rendering efficient.
If you use a getter property multiple times in html template, Aurelia will call the getter multiple times even within one rendering cycle, no matter whether you use computedFrom or dirty-check properties.
The behaviour is costly if your getter is not cheap to run.
This getterThrottle
decorator works for both computedFrom and dirty-check properties, reduces the number of calls (Aurelia calls and your calls) to one for every rendering cycle.
Usage:
npm i aurelia-getter-throttle # or yarn add aurelia-getter-throttle
import {getterThrottle} from 'aurelia-getter-throttle';
export class YourComponent {
// the order of decorators doesn't matter,
// you can place getterThrottle above or below computedFrom
@computedFrom('one', 'two')
@getterThrottle()
get foo() {
// ...
}
// for dirty-check property
@getterThrottle()
get bar() {
// ...
}
// the default dirty-check runs every 120ms.
// you can effectively make it longer, without altering Aurelia core behaviour.
@getterThrottle(500)
get bar() {
// ...
}
}
But be careful with the cached value:
@getterThrottle()
get hasError() {
return !!this.errors;
}
someLogic() {
this.errors = null;
// hasError is false and cached
if (this.hasError) {}
// ...
this.errors = something;
// hasError is still false, as it's cached.
// you'd better check this.errors directly.
if (this.hasError) {}
}