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More Knockout code to ES6
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djmaze
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commit
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22 changed files with 733 additions and 865 deletions
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@ -6,142 +6,141 @@
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ko.bindingHandlers = {};
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// Use an overridable method for retrieving binding handlers so that plugins may support dynamically created handlers
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ko['getBindingHandler'] = bindingKey => ko.bindingHandlers[bindingKey];
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var inheritParentVm = {};
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// The ko.bindingContext constructor is only called directly to create the root context. For child
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// contexts, use bindingContext.createChildContext or bindingContext.extend.
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ko.bindingContext = function(dataItemOrAccessor, parentContext, dataItemAlias, extendCallback, options) {
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ko.bindingContext = class {
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constructor(dataItemOrAccessor, parentContext, dataItemAlias, extendCallback, options)
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{
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// The binding context object includes static properties for the current, parent, and root view models.
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// If a view model is actually stored in an observable, the corresponding binding context object, and
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// any child contexts, must be updated when the view model is changed.
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function updateContext() {
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// Most of the time, the context will directly get a view model object, but if a function is given,
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// we call the function to retrieve the view model. If the function accesses any observables or returns
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// an observable, the dependency is tracked, and those observables can later cause the binding
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// context to be updated.
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var dataItemOrObservable = isFunc ? realDataItemOrAccessor() : realDataItemOrAccessor,
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dataItem = ko.utils.unwrapObservable(dataItemOrObservable);
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// The binding context object includes static properties for the current, parent, and root view models.
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// If a view model is actually stored in an observable, the corresponding binding context object, and
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// any child contexts, must be updated when the view model is changed.
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function updateContext() {
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// Most of the time, the context will directly get a view model object, but if a function is given,
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// we call the function to retrieve the view model. If the function accesses any observables or returns
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// an observable, the dependency is tracked, and those observables can later cause the binding
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// context to be updated.
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var dataItemOrObservable = isFunc ? realDataItemOrAccessor() : realDataItemOrAccessor,
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dataItem = ko.utils.unwrapObservable(dataItemOrObservable);
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if (parentContext) {
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// Copy $root and any custom properties from the parent context
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ko.utils.extend(self, parentContext);
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if (parentContext) {
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// Copy $root and any custom properties from the parent context
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ko.utils.extend(self, parentContext);
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// Copy Symbol properties
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if (contextAncestorBindingInfo in parentContext) {
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self[contextAncestorBindingInfo] = parentContext[contextAncestorBindingInfo];
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}
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} else {
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self['$parents'] = [];
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self['$root'] = dataItem;
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// Copy Symbol properties
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if (contextAncestorBindingInfo in parentContext) {
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self[contextAncestorBindingInfo] = parentContext[contextAncestorBindingInfo];
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// Export 'ko' in the binding context so it will be available in bindings and templates
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// even if 'ko' isn't exported as a global, such as when using an AMD loader.
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// See https://github.com/SteveSanderson/knockout/issues/490
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self['ko'] = ko;
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}
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self[contextSubscribable] = subscribable;
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if (shouldInheritData) {
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dataItem = self['$data'];
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} else {
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self['$rawData'] = dataItemOrObservable;
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self['$data'] = dataItem;
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}
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if (dataItemAlias)
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self[dataItemAlias] = dataItem;
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// The extendCallback function is provided when creating a child context or extending a context.
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// It handles the specific actions needed to finish setting up the binding context. Actions in this
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// function could also add dependencies to this binding context.
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if (extendCallback)
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extendCallback(self, parentContext, dataItem);
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// When a "parent" context is given and we don't already have a dependency on its context, register a dependency on it.
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// Thus whenever the parent context is updated, this context will also be updated.
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if (parentContext && parentContext[contextSubscribable] && !ko.dependencyDetection.computed().hasAncestorDependency(parentContext[contextSubscribable])) {
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parentContext[contextSubscribable]();
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}
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if (dataDependency) {
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self[contextDataDependency] = dataDependency;
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}
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return self['$data'];
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}
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var self = this,
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shouldInheritData = dataItemOrAccessor === inheritParentVm,
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realDataItemOrAccessor = shouldInheritData ? undefined : dataItemOrAccessor,
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isFunc = typeof(realDataItemOrAccessor) == "function" && !ko.isObservable(realDataItemOrAccessor),
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subscribable,
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dataDependency = options && options['dataDependency'];
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if (options && options['exportDependencies']) {
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// The "exportDependencies" option means that the calling code will track any dependencies and re-create
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// the binding context when they change.
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updateContext();
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} else {
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self['$parents'] = [];
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self['$root'] = dataItem;
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subscribable = ko.pureComputed(updateContext);
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subscribable.peek();
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// Export 'ko' in the binding context so it will be available in bindings and templates
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// even if 'ko' isn't exported as a global, such as when using an AMD loader.
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// See https://github.com/SteveSanderson/knockout/issues/490
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self['ko'] = ko;
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// At this point, the binding context has been initialized, and the "subscribable" computed observable is
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// subscribed to any observables that were accessed in the process. If there is nothing to track, the
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// computed will be inactive, and we can safely throw it away. If it's active, the computed is stored in
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// the context object.
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if (subscribable.isActive()) {
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// Always notify because even if the model ($data) hasn't changed, other context properties might have changed
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subscribable['equalityComparer'] = null;
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} else {
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self[contextSubscribable] = undefined;
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}
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}
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self[contextSubscribable] = subscribable;
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if (shouldInheritData) {
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dataItem = self['$data'];
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} else {
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self['$rawData'] = dataItemOrObservable;
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self['$data'] = dataItem;
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}
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if (dataItemAlias)
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self[dataItemAlias] = dataItem;
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// The extendCallback function is provided when creating a child context or extending a context.
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// It handles the specific actions needed to finish setting up the binding context. Actions in this
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// function could also add dependencies to this binding context.
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if (extendCallback)
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extendCallback(self, parentContext, dataItem);
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// When a "parent" context is given and we don't already have a dependency on its context, register a dependency on it.
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// Thus whenever the parent context is updated, this context will also be updated.
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if (parentContext && parentContext[contextSubscribable] && !ko.dependencyDetection.computed().hasAncestorDependency(parentContext[contextSubscribable])) {
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parentContext[contextSubscribable]();
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}
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if (dataDependency) {
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self[contextDataDependency] = dataDependency;
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}
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return self['$data'];
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}
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var self = this,
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shouldInheritData = dataItemOrAccessor === inheritParentVm,
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realDataItemOrAccessor = shouldInheritData ? undefined : dataItemOrAccessor,
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isFunc = typeof(realDataItemOrAccessor) == "function" && !ko.isObservable(realDataItemOrAccessor),
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subscribable,
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dataDependency = options && options['dataDependency'];
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if (options && options['exportDependencies']) {
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// The "exportDependencies" option means that the calling code will track any dependencies and re-create
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// the binding context when they change.
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updateContext();
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} else {
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subscribable = ko.pureComputed(updateContext);
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subscribable.peek();
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// At this point, the binding context has been initialized, and the "subscribable" computed observable is
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// subscribed to any observables that were accessed in the process. If there is nothing to track, the
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// computed will be inactive, and we can safely throw it away. If it's active, the computed is stored in
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// the context object.
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if (subscribable.isActive()) {
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// Always notify because even if the model ($data) hasn't changed, other context properties might have changed
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subscribable['equalityComparer'] = null;
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} else {
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self[contextSubscribable] = undefined;
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// Extend the binding context hierarchy with a new view model object. If the parent context is watching
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// any observables, the new child context will automatically get a dependency on the parent context.
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// But this does not mean that the $data value of the child context will also get updated. If the child
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// view model also depends on the parent view model, you must provide a function that returns the correct
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// view model on each update.
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'createChildContext'(dataItemOrAccessor, dataItemAlias, extendCallback, options) {
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if (!options && dataItemAlias && typeof dataItemAlias == "object") {
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options = dataItemAlias;
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dataItemAlias = options['as'];
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extendCallback = options['extend'];
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}
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}
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}
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// Extend the binding context hierarchy with a new view model object. If the parent context is watching
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// any observables, the new child context will automatically get a dependency on the parent context.
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// But this does not mean that the $data value of the child context will also get updated. If the child
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// view model also depends on the parent view model, you must provide a function that returns the correct
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// view model on each update.
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ko.bindingContext.prototype['createChildContext'] = function (dataItemOrAccessor, dataItemAlias, extendCallback, options) {
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if (!options && dataItemAlias && typeof dataItemAlias == "object") {
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options = dataItemAlias;
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dataItemAlias = options['as'];
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extendCallback = options['extend'];
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}
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if (dataItemAlias && options && options['noChildContext']) {
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var isFunc = typeof(dataItemOrAccessor) == "function" && !ko.isObservable(dataItemOrAccessor);
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return new ko.bindingContext(inheritParentVm, this, null, self => {
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if (extendCallback)
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extendCallback(self);
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self[dataItemAlias] = isFunc ? dataItemOrAccessor() : dataItemOrAccessor;
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}, options);
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}
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if (dataItemAlias && options && options['noChildContext']) {
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var isFunc = typeof(dataItemOrAccessor) == "function" && !ko.isObservable(dataItemOrAccessor);
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return new ko.bindingContext(inheritParentVm, this, null, self => {
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return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, (self, parentContext) => {
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// Extend the context hierarchy by setting the appropriate pointers
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self['$parentContext'] = parentContext;
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self['$parent'] = parentContext['$data'];
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self['$parents'] = (parentContext['$parents'] || []).slice(0);
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self['$parents'].unshift(self['$parent']);
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if (extendCallback)
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extendCallback(self);
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self[dataItemAlias] = isFunc ? dataItemOrAccessor() : dataItemOrAccessor;
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}, options);
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}
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return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, (self, parentContext) => {
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// Extend the context hierarchy by setting the appropriate pointers
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self['$parentContext'] = parentContext;
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self['$parent'] = parentContext['$data'];
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self['$parents'] = (parentContext['$parents'] || []).slice(0);
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self['$parents'].unshift(self['$parent']);
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if (extendCallback)
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extendCallback(self);
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}, options);
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};
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// Extend the binding context with new custom properties. This doesn't change the context hierarchy.
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// Similarly to "child" contexts, provide a function here to make sure that the correct values are set
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// when an observable view model is updated.
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ko.bindingContext.prototype['extend'] = function(properties, options) {
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return new ko.bindingContext(inheritParentVm, this, null, self =>
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ko.utils.extend(self, typeof(properties) == "function" ? properties(self) : properties)
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, options);
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// Extend the binding context with new custom properties. This doesn't change the context hierarchy.
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// Similarly to "child" contexts, provide a function here to make sure that the correct values are set
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// when an observable view model is updated.
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'extend'(properties, options) {
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return new ko.bindingContext(inheritParentVm, this, null, self =>
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ko.utils.extend(self, typeof(properties) == "function" ? properties(self) : properties)
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, options);
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}
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};
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var boundElementDomDataKey = ko.utils.domData.nextKey();
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@ -154,41 +153,44 @@
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asyncContext.notifyAncestor();
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}
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}
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function AsyncCompleteContext(node, bindingInfo, ancestorBindingInfo) {
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this.node = node;
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this.bindingInfo = bindingInfo;
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this.asyncDescendants = [];
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this.childrenComplete = false;
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if (!bindingInfo.asyncContext) {
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ko.utils.domNodeDisposal.addDisposeCallback(node, asyncContextDispose);
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class AsyncCompleteContext {
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constructor(node, bindingInfo, ancestorBindingInfo) {
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this.node = node;
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this.bindingInfo = bindingInfo;
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this.asyncDescendants = new Set;
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this.childrenComplete = false;
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if (!bindingInfo.asyncContext) {
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ko.utils.domNodeDisposal.addDisposeCallback(node, asyncContextDispose);
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}
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if (ancestorBindingInfo && ancestorBindingInfo.asyncContext) {
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ancestorBindingInfo.asyncContext.asyncDescendants.add(node);
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this.ancestorBindingInfo = ancestorBindingInfo;
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}
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}
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if (ancestorBindingInfo && ancestorBindingInfo.asyncContext) {
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ancestorBindingInfo.asyncContext.asyncDescendants.push(node);
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this.ancestorBindingInfo = ancestorBindingInfo;
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notifyAncestor() {
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if (this.ancestorBindingInfo && this.ancestorBindingInfo.asyncContext) {
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this.ancestorBindingInfo.asyncContext.descendantComplete(this.node);
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}
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}
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descendantComplete(node) {
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this.asyncDescendants.delete(node);
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if (!this.asyncDescendants.size && this.childrenComplete) {
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this.completeChildren();
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}
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}
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completeChildren() {
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this.childrenComplete = true;
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if (this.bindingInfo.asyncContext && !this.asyncDescendants.size) {
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this.bindingInfo.asyncContext = null;
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ko.utils.domNodeDisposal.removeDisposeCallback(this.node, asyncContextDispose);
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ko.bindingEvent.notify(this.node, ko.bindingEvent.descendantsComplete);
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this.notifyAncestor();
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}
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}
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}
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AsyncCompleteContext.prototype.notifyAncestor = function () {
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if (this.ancestorBindingInfo && this.ancestorBindingInfo.asyncContext) {
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this.ancestorBindingInfo.asyncContext.descendantComplete(this.node);
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}
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};
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AsyncCompleteContext.prototype.descendantComplete = function (node) {
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ko.utils.arrayRemoveItem(this.asyncDescendants, node);
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if (!this.asyncDescendants.length && this.childrenComplete) {
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this.completeChildren();
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}
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};
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AsyncCompleteContext.prototype.completeChildren = function () {
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this.childrenComplete = true;
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if (this.bindingInfo.asyncContext && !this.asyncDescendants.length) {
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this.bindingInfo.asyncContext = null;
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ko.utils.domNodeDisposal.removeDisposeCallback(this.node, asyncContextDispose);
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ko.bindingEvent.notify(this.node, ko.bindingEvent.descendantsComplete);
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this.notifyAncestor();
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}
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};
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ko.bindingEvent = {
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childrenComplete: "childrenComplete",
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@ -310,7 +312,7 @@
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cyclicDependencyStack = []; // Keeps track of a depth-search so that, if there's a cycle, we know which bindings caused it
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ko.utils.objectForEach(bindings, function pushBinding(bindingKey) {
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if (!bindingsConsidered[bindingKey]) {
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var binding = ko['getBindingHandler'](bindingKey);
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var binding = ko.bindingHandlers[bindingKey];
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if (binding) {
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// First add dependencies (if any) of the current binding
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if (binding['after']) {
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