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knockout.ratelimit_override.js
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knockout.ratelimit_override.js
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/**
* allow rateLimit observables to give functions immediately notify subscribers
* retains the rateLimit extender functionality while adding .force() and .forceVal() functions
* to the rateLimited observable to immediately notify value changes
*/
ko.extenders.rateLimit = (function (originalFunc) {
return function (target, options) {
var value = ko.utils.unwrapObservable(target());
target.notifyImmediately = target.notifySubscribers;
target.old_value = typeof value == 'object' ? ko.toJSON(value): value;
target.notifySubscribers = function() {
var value = ko.utils.unwrapObservable(target());
var compare_value = typeof value == 'object' ? ko.toJSON(value): value;
if(target.disableRateLimit || (target.old_value != compare_value && value != undefined)) {
target.notifyImmediately( value );
target.old_value = typeof value == 'object' ? ko.toJSON(value): value;
}
}
/**
* immediately notify changes
*/
target.force = function() {
var value = ko.utils.unwrapObservable(target());
target.clear();
if(target.old_value != value && value != undefined) {
target.notifyImmediately( value );
target.old_value = typeof value == 'object' ? ko.toJSON(value) : value;
}
}
/**
* load value and immediately notify changes
* @param {any} val value to be immediately loaded into observable and notified
*/
target.forceValue = function(val) {
target(val);
target.clear();
target.notifyImmediately( val );
target.old_value = typeof val == 'object' ? ko.toJSON(val) : val;
}
return originalFunc(target, options);
}
})(ko.extenders.rateLimit);