Playing around with custom elements, I’m trying to get a click event fired depending on custom element attribute’s value. But using the attributeChangedCallback() method (along with the connectedCallback() method) I’m ending up with multiple event listeners. Why is the attributeChangedCallback() method always called twice and therefore adds two event listeners? How to avoid this? What would be best practice? Answer
Tag: custom-element
How do I implement Coloris npm package as a custom element?
I have been trying to implement an NPM called Coloris, to provide end-user color customization capability to a Wix website through a web component. From what I can see, the javascript isn’t working/executing. I’ve tried a few solutions for getting javascript to work in innerHTML, but they haven’t worked so far. This issue has stumped me for a week and
Why does customElements.upgrade appear to not upgrade this custom element?
I have a situation similar to the example below: from a template element, I clone a node tree containing custom elements. One custom element is passed data during initialization, represented here by the line infobox.setData(getData()). The function I use to pass the data (setData) is added by my custom class, so I make sure the custom element is upgraded before
What happens to child nodes if there is no “, but a shadow root
Consider this code: This will show »Test« within the browser. If the constructor is changed to: The »Test« disappears, since there is a shadow root now. If the constructor is furthermore changed to The »Test« appears again, since there is now a default slot for all child Nodes of <foo-bar> But what happens to the child nodes if there is
Initialisation of Custom Elements Inside Document Fragment
Consider this HTML template with two flat x-elements and one nested. How to initialise (fire constructor) all custom elements in cloned from fooTemplate document fragment without appending it to DOM, neither by extending built-in elements with is=”x-element”; either entire fragment. Note that script executes with defer attribute. Answer We can initialise template with this arrow function: Or with this method
How should I reference assets in angular custom element (Web Components)
I have created a web component and I referenced image from my asset folder in there as below on local everything is fine, I published my custom element to firebase host and javascript, css and asset folder already exist on my host. then I tried to use my web component in another html peage as below and served this via
Creating custom element without using class keyword
This is actually more a question about the object-orientation model in ES6. However I am going to use the creation of a new custom element as an example. So the new and shiny (as of today) method to create a new custom element is via customElements.define() which take in a tag name, a constructor, and options (which is optional) according