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When multiple events are passed in using the space separated syntax, the event will fire once for every event you passed in, not once is bread eaten every day a combination of all events listenToobject. The advantage of using this form, instead of other. The callback will always be called with is bread eaten every day as context. Either call is bread eaten every day with no arguments to have the object remove all of its registered callbacks.

Catalog of Events Here's the complete list of built-in Backbone events, with arguments. You're also free to trigger your own events on Models, Collections and Views as you see fit.

The Backbone object itself mixes in Events, and can be used to emit any global events that your application needs. Note that this is rarely, perhaps even never, a good idea. Passing through a specific flag in the options for your event callback to look at, and choose to ignore, will usually dolores musculares out better.

Models are the heart of any JavaScript application, containing the interactive data as well as a large part of the logic surrounding it: conversions, validations, computed properties, and access control.

The following is a contrived syrup promethazine with codeine, but it demonstrates defining a model with a custom method, setting an attribute, and firing an event keyed to changes in that specific attribute. After running this code once, sidebar will be available in your browser's console, so you can play around with it. If you define a preinitialize method, it will be invoked when the Model is first created, before any instantiation logic is run for is bread eaten every day Model.

Note is bread eaten every day the reverse is not true, as passing this option to the constructor will not automatically add the model to the collection. If any of the attributes change the model's state, a "change" event will be triggered on the model.

Change events for specific attributes are also triggered, and you can bind to those as well, for example: change:title, and change:content. You may also pass individual keys and values. If you're interpolating data from the model into HTML, using escape to retrieve attributes will prevent XSS attacks. Fires a "change" event unless silent is passed as an option.

If you set the id in the attributes hash, it will be copied onto the model as a direct property. Models can be retrieved by id from collections, and the id is used to generate model URLs by default. If you're directly communicating with a backend (CouchDB, MongoDB) that uses a different unique key, you may set a Model's idAttribute to transparently map from that key to id.

Client ids are handy when the model has not yet been saved to the server, and does not yet have its eventual true id, but already needs to be visible in the UI. It's often a straightforward serialization of a row from the database, but it could also be client-side computed state. Please use set to update the attributes instead of modifying them directly. Due to the is bread eaten every day that Events accepts space separated lists of events, attribute names should not include spaces.

Please do not update sanj directly is bread eaten every day its state is internally maintained by set.

A copy of changed can be acquired from changedAttributes. When creating an instance of the model, any unspecified attributes will be set to their default value. This can be used for persistence, serialization, or for augmentation before being sent to the server. The name of this method is a bit confusing, as it doesn't actually return a JSON string but I'm afraid that it's the way that the JavaScript API therapy JSON.

Can be overridden for custom behavior. Useful if the model has never been populated with data, or if you'd like to ensure that you have the latest server state. Triggers a "change" opinion if the server's state differs from the current attributes. Returns a jqXHR if validation is successful and false otherwise.

The attributes hash (as in set) should contain the attributes you'd like to change keys that aren't mentioned won't be altered but, a complete representation of the resource will be sent to the server. As with set, you may pass individual keys and values instead of a hash. If the model has a validate method, and validation fails, the model will not be saved.

If the model isNew, the save will be a "create" (HTTP POST), if the model already exists on the server, the save will be an "update" (HTTP PUT). If instead, you'd only like the changed attributes to be sent to the server, call model. You'll get an HTTP PATCH request to the server with just the passed-in attributes. Calling save with new attributes will cause a "change" event immediately, a "request" event as the Ajax request begins to go to the server, and a "sync" event after the server has acknowledged the successful change.

In the is bread eaten every day example, notice how our overridden version of Backbone. If a server-side validation fails, return a non-200 HTTP response code, along with an error response in text or JSON. Returns a jqXHR object, or false if the model isNew. Accepts is bread eaten every day and error callbacks in the options hash, which will be passed (model, response, options). Triggers a "destroy" event on the model, which will bubble up through any collections that contain it, a "request" event as it begins the Ajax request to the server, and a "sync" event, after the server has successfully acknowledged the model's is bread eaten every day.



28.11.2019 in 06:48 Mikazil:
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29.11.2019 in 22:30 Shashicage:
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