Can Angular 1.* ng-repeat function with Set and Map new objects?
Is there a roadmap to implement this integration?
Can Angular 1.* ng-repeat function with Set and Map new objects?
Is there a roadmap to implement this integration?
Angular utilizes the for..in operator internally to loop through non-array objects. Check out the source link for proof. However, collections like Map and Set require the use of for..of for iteration. Therefore, these collections cannot be used directly with ng-repeat without additional conversions.
The upcoming Angular 2 will support ES6 features and will also include the for..of syntax for looping. Refer to angular 2 docs for more information.
I attempted to connect a Map to ng-repeat in Angular 2, but even with *ngFor="let item of items" it was not successful. I found a solution that worked for me:
/*
* An extension of the ES6 map that also allows binding to its array of values
*/
class BindableMap extends Map {
constructor(...args) {
super(...args);
this.bindableValues = [];
}
updateBindableValues() {
// Clear the array without creating a new one.
this.bindableValues.length = 0;
// Add all the new values
this.bindableValues.push(...Array.from(super.values()));
}
clear(...args) {
super.clear(...args);
this.updateBindableValues();
}
set(...args) {
super.set(...args);
this.updateBindableValues();
}
delete(...args) {
super.delete(...args);
this.updateBindableValues();
}
}
This allows you to use it in Angular 1.x as well with
ng-repeat="value in map.bindableValues"It's worth noting that this may not be the most efficient solution, as the bindable values are recreated on every map change. However, it suited my needs. Additionally, you can expand the BindableMap to bind to keys or key-value pairs if desired.
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