In Knockout, bindings are implemented internally using dependentObservables, so you can actually use a plain function in place of a dependentObservable in your bindings. The binding will run your function inside of a dependentObservable, so any observables that have their value accessed will create a dependency (your binding will fire again when it changes). Here … Read more
It sounds like you were on the right track. You basically want to do the equivalent of: click: function() { return true; }, clickBubble: false OR This could be done in a custom binding like: ko.bindingHandlers.stopBubble = { init: function(element) { ko.utils.registerEventHandler(element, “click”, function(event) { event.cancelBubble = true; if (event.stopPropagation) { event.stopPropagation(); } }); } … Read more
An alternative that does not rely on the order that the fields are bound is to have the binding set an id property on the data itself, which would need to be an observable. ko.bindingHandlers.uniqueId = { init: function(element, valueAccessor) { var value = valueAccessor(); value.id = value.id || ko.bindingHandlers.uniqueId.prefix + (++ko.bindingHandlers.uniqueId.counter); element.id = value.id; … Read more
You can’t call something on the entire viewModel, but on an individual observable you can call myObservable.valueHasMutated() to notify subscribers that they should re-evaluate. This is generally not necessary in KO, as you mentioned.
There are a few directions that you could go with this one. One option is to call ko.applyBindings with distinct view models against separate DOM elements like: var viewModelA = { name: “Bob” }; var viewModelB = { price: 50 }; ko.applyBindings(viewModelA, document.getElementById(“aContainer”)); ko.applyBindings(viewModelB, document.getElementById(“bContainer”)); http://jsfiddle.net/9abgxn8k/ In this case, you would want to make sure … Read more
ko.cleanNode is used internally by Knockout to clean up data/computeds that it created related to the element. It does not remove any event handlers added by bindings or necessarily understand if a binding made changes to the DOM. This can definitely cause problems like having multiple handlers attached to an element when it is subsequently … Read more