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KnockoutJS use Symbol for isObservableArray()

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the-djmaze 2024-02-11 14:44:47 +01:00
parent 5225b62a0a
commit 7ca5991041
3 changed files with 34 additions and 42 deletions
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10
vendors/knockout/src/subscribables/observableArray.js vendored
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@ -7,12 +7,12 @@ ko.observableArray = initialValues => {
return Object.setPrototypeOf(ko.observable(initialValues), ko.observableArray['fn']).extend({'trackArrayChanges':true});
};
//const IS_OBSERVABLE_ARRAY = Symbol('IS_OBSERVABLE_ARRAY');
const IS_OBSERVABLE_ARRAY = Symbol('IS_OBSERVABLE_ARRAY');
// Note that for browsers that don't support proto assignment, the
// inheritance chain is created manually in the ko.observableArray constructor
ko.observableArray['fn'] = Object.setPrototypeOf({
// [IS_OBSERVABLE_ARRAY]: 1,
[IS_OBSERVABLE_ARRAY]: 1,
'remove'(valueOrPredicate) {
var underlyingArray = this.peek();
var removed = false;
@ -63,11 +63,7 @@ Object.getOwnPropertyNames(Array.prototype).forEach(methodName => {
}
});
//ko.isObservableArray = obj => !!(obj && obj[IS_OBSERVABLE_ARRAY]);
ko.isObservableArray = instance =>
ko.isObservable(instance)
&& typeof instance["remove"] == "function"
&& typeof instance["push"] == "function";
ko.isObservableArray = obj => !!(obj && obj[IS_OBSERVABLE_ARRAY]);
ko.exportSymbol('observableArray', ko.observableArray);
ko.exportSymbol('isObservableArray', ko.isObservableArray);