polymer_ajax_backed_model_behavior 0.0.2

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ajax-backed-model-behavior #

Pub Travis

A Dart Polymer behavior that provides a Polymer element with a model derived from an ajax request.

Usage #

First, make your model class implement AjaxBackedModel and its abstract method setFromJsonString. This method handles deserialization of JSON into an existing instance of the model.

Next, create a Polymer element that will utilize the model, by implementing AjaxBackedModelBehavior. The element must implement get modelInstance which returns an instance of the model class above.

With the above wiring, the polymer element gains additional attributes which simplify its use. For example:

<my-element auto-load ajax-url="http://mydomain/api/data.json"></my-element>

With the usage above, the json returned from data.json will be converted to the model object and assigned to the "ajaxModel" attribute when the element is readied. The element's html can reference model data as [[ajaxModel.myField]].

Attributes #

  • file 
  • result in the model being updated with the result of a new ajax 
  •  where it is not necessary to look up the model via ajax

Events #

AjaxBackedModelBehavior may fire the following three events

  • ajax-model-request, detail: String containing url
  • ajax-model-response, detail: AjaxBackedModel
  • ajax-model-error, detail: Map containing 'status' and 'statusText'

Changing the model attribute name #

If desired, the model attribute name can be changed from the default ("ajaxModel"). Override the method get modelName. See example.

Future improvements #

I would like to provide a @AjaxModel annotation, and create a transformer automatically provide the wiring described above.

Example #

The following code illustrates a simple example of a model and a custom Polymer element using it an ajax backed model.

class Country extends Object with AjaxBackedModel, JsProxy {

  @reflectable int id;
  @reflectable String name;


  setFromJsonString(String json) {
    id = o['id'];
    name = o['country'];

class CountryDetail extends PolymerElement with AjaxBackedModelBehavior {

  CountryDetail.created() : super.created();

  AjaxBackedModel get modelInstance => new Country();


An full example can be found in the example directory and run via pub serve example or viewed online

Testing #

To run on dartium (default): pub run test As usual, tests can be run on other platforms with -p<platform>

To run tests as javascript, the pub serve and test execution must be performed separately. Run pub serve test --port=8080 from one terminal and pub run test -pchrome --pub-serve=8080 from a second.

Note that tests are specifically blocked from running on Firefox currently in order to utilize Travis CI.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  polymer_ajax_backed_model_behavior: ^0.0.2

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:polymer_ajax_backed_model_behavior/polymer_ajax_backed_model_behavior.dart';
Version Uploaded Documentation Archive
0.0.2 Aug 31, 2016 Go to the documentation of polymer_ajax_backed_model_behavior 0.0.2 Download polymer_ajax_backed_model_behavior 0.0.2 archive
0.0.1 Aug 31, 2016 Go to the documentation of polymer_ajax_backed_model_behavior 0.0.1 Download polymer_ajax_backed_model_behavior 0.0.1 archive
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The package version is not analyzed, because it does not support Dart 2. Until this is resolved, the package will receive a health and maintenance score of 0.

Analysis issues and suggestions

Support Dart 2 in pubspec.yaml.

The SDK constraint in pubspec.yaml doesn't allow the Dart 2.0.0 release. For information about upgrading it to be Dart 2 compatible, please see https://www.dartlang.org/dart-2#migration.

Maintenance issues and suggestions

Make sure dartdoc successfully runs on your package's source files. (-10 points)

Dependencies were not resolved.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=1.13.0 <2.0.0