@webcomponents/custom-elements
Version:
HTML Custom Elements Polyfill
109 lines (83 loc) • 3.13 kB
HTML
<html>
<head>
<title>Element#removeAttributeNS</title>
<script>
(window.customElements = window.customElements || {}).forcePolyfill = true;
</script>
<script src="../../../../es6-promise/dist/es6-promise.auto.min.js"></script>
<script src="../../../../web-component-tester/browser.js"></script>
<script src="../../../custom-elements.min.js"></script>
</head>
<body>
<script>
// In older browsers, `Element#getAttributeNS` may return the empty string
// instead of null if the attribute does not exist. For details, see;
// https://developer.mozilla.org/en-US/docs/Web/API/Element/getAttributeNS#Notes
const NON_EXISTANT_VALUE = document.body.getAttributeNS('NO_SUCH_NS', 'attr');
function generateLocalName() {
return 'test-element-' + Math.random().toString(32).substring(2);
}
function defineWithLocalName(localName, observedAttributes) {
customElements.define(localName, class extends HTMLElement {
static get observedAttributes() { return observedAttributes; }
constructor() {
super();
this.constructed = true;
this.connectedCallbackCount = 0;
this.disconnectedCallbackCount = 0;
this.attrCallbackArgs = [];
}
connectedCallback() {
this.connectedCallbackCount++;
}
disconnectedCallback() {
this.disconnectedCallbackCount++;
}
attributeChangedCallback(name, oldValue, newValue, namespace) {
this.attrCallbackArgs.push(Array.prototype.slice.apply(arguments));
}
});
}
suite('Removing an unset attribute.', function() {
let localName;
setup(function() {
localName = generateLocalName();
defineWithLocalName(localName, ['attr']);
});
test('Removing an attribute with no value (null) does not trigger a callback.', function() {
const element = document.createElement(localName);
element.removeAttributeNS('ns', 'attr');
assert.equal(element.attrCallbackArgs.length, 0);
});
});
suite('Removing a set attribute.', function() {
let localName1;
let localName2;
setup(function() {
localName1 = generateLocalName();
defineWithLocalName(localName1, []);
localName2 = generateLocalName();
defineWithLocalName(localName2, ['attr']);
});
test('Removing an unobserved value does not trigger a callback.', function() {
const element = document.createElement(localName1);
assert.equal(element.attrCallbackArgs.length, 0);
element.setAttributeNS('ns', 'attr', 'abc');
assert.equal(element.attrCallbackArgs.length, 0);
element.removeAttributeNS('ns', 'attr');
assert.equal(element.attrCallbackArgs.length, 0);
});
test('Removing an observed attribute triggers a callback.', function() {
const element = document.createElement(localName2);
assert.equal(element.attrCallbackArgs.length, 0);
element.setAttributeNS('ns', 'attr', 'abc');
assert.equal(element.attrCallbackArgs.length, 1);
element.removeAttributeNS('ns', 'attr');
assert.equal(element.attrCallbackArgs.length, 2);
assert.deepEqual(element.attrCallbackArgs[1], ['attr', 'abc', NON_EXISTANT_VALUE, 'ns']);
});
});
</script>
</body>
</html>