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Support customElements #320
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kentcdodds
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testing-library:master
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hontas:pr/support-custom-elements
Jun 8, 2020
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,35 @@ | ||
const observed = ['value'] | ||
|
||
class CustomEl extends HTMLElement { | ||
static getObservedAttributes() { | ||
return observed | ||
} | ||
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constructor() { | ||
super() | ||
this.attachShadow({mode: 'open'}) | ||
this.shadowRoot.innerHTML = `<input>` | ||
this.$input = this.shadowRoot.querySelector('input') | ||
} | ||
|
||
connectedCallback() { | ||
observed.forEach(name => { | ||
this.render(name, this.getAttribute(name)) | ||
}) | ||
} | ||
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attributeChangedCallback(name, oldVal, newVal) { | ||
if (oldVal === newVal) return | ||
this.render(name, newVal) | ||
} | ||
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render(name, value) { | ||
if (value == null) { | ||
this.$input.removeAttribute(name) | ||
} else { | ||
this.$input.setAttribute(name, value) | ||
} | ||
} | ||
} | ||
|
||
customElements.define('custom-el', CustomEl) |
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Rather than complicating the
setup
function (especially for what will likely be only a very small number of tests that need it), let's just not use the setup function in the test and instead useaddListeners
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yea good idea! fixing...