e711257fa2
Utility wrapper for tracking Polymer element properties updates.
Usage example:
``` js
Gerrit.install(plugin => {
plugin.getDomHook('change-view').onAttached(element => {
if (!element.content) { return; }
plugin.attributeHelper(element.content)
.get('change')
.then(change => {
// Is executed once on switching to change view.
});
});
plugin.getDomHook('reply-text').onAttached(element => {
if (!element.content) { return; }
plugin.attributeHelper(element.content)
.bind('text', replyText => {
// Is called every time reply text changes.
});
});
});
```
Change-Id: Ia95364df58489f71ea1fd591a160b73ac1d60e96
98 lines
2.7 KiB
HTML
98 lines
2.7 KiB
HTML
<!DOCTYPE html>
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<!--
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Copyright (C) 2017 The Android Open Source Project
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
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<title>gr-attribute-helper</title>
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<script src="../../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
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<script src="../../../bower_components/web-component-tester/browser.js"></script>
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<link rel="import" href="../../../test/common-test-setup.html"/>
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<link rel="import" href="gr-attribute-helper.html"/>
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<script>void(0);</script>
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<dom-element id="some-element">
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<script>
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Polymer({
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is: 'some-element',
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properties: {
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fooBar: {
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type: Object,
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notify: true,
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},
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},
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});
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</script>
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</dom-element>
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<test-fixture id="basic">
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<template>
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<some-element></some-element>
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</template>
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</test-fixture>
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<script>
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suite('gr-attribute-helper tests', () => {
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let element;
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let instance;
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let sandbox;
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setup(() => {
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sandbox = sinon.sandbox.create();
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element = fixture('basic');
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instance = new GrAttributeHelper(element);
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});
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teardown(() => {
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sandbox.restore();
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});
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test('resolved on value change from undefined', () => {
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const promise = instance.get('fooBar').then(value => {
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assert.equal(value, 'foo! bar!');
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});
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element.fooBar = 'foo! bar!';
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return promise;
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});
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test('resolves to current attribute value', () => {
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element.fooBar = 'foo-foo-bar';
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const promise = instance.get('fooBar').then(value => {
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assert.equal(value, 'foo-foo-bar');
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});
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element.fooBar = 'no bar';
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return promise;
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});
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test('bind', () => {
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const stub = sandbox.stub();
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element.fooBar = 'bar foo';
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const unbind = instance.bind('fooBar', stub);
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element.fooBar = 'partridge in a foo tree';
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element.fooBar = 'five gold bars';
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assert.equal(stub.callCount, 3);
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assert.deepEqual(stub.args[0], ['bar foo']);
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assert.deepEqual(stub.args[1], ['partridge in a foo tree']);
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assert.deepEqual(stub.args[2], ['five gold bars']);
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stub.reset();
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unbind();
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instance.fooBar = 'ladies dancing';
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assert.isFalse(stub.called);
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});
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});
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</script>
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