Slots Without Shadow Dom
by admin
index.js
| // Custom Template/Slot without Shadow DOM |
| // template refers to <template></template> |
| // context refers to stuff inside <your-custom-element> <span slot='bork'>🍭</span> </your-custom-element> |
| // overall flow of operation translates to YOUR-HTML = TEMPLATE(CONTEXT) |
| // a map of all <slot name='bork'> elements, where key is the name attribute, and value the <slot name='bork'> node; |
| consttemplate=newMap(Array.from(this.querySelectorAll('slot').values()).map(i=>[i.name,i])); |
| // an array of [[name, element]] where name is the slot attribute of html element <span slot='bork'>🍭</span> |
| constcontext=Array.from(this.querySelectorAll(':scope > *[slot]').values()).map(i=>[i.slot,i]); |
| console.log(context) |
| // traverse context, the list of elements with slot='*' property |
| // name is taken from context (see above) |
| // element is the thing we want to replace <slot> with |
| for(const[slotName,element]ofcontext){ |
| // slot is the <slot name='bork'> referenced by <span slot='bork'>🍭</span> inside your custom element |
| constslot=template.get(slotName); |
| // if template had the slot bork, replace the entire <slot name='bork'>*</slot> with <span slot='bork'>🍭</span> |
| if(slot)slot.parentElement.replaceChild(element,slot);// Syntax: replacedNode = parentNode.replaceChild(newChild, oldChild); |
| // remove the remove slot='bork' from <span slot='bork'>🍭</span> |
| // NOTE: THIS IS NON SPEC, YOU SHOULD COMMENT THIS OUT FOR FUTURE COMPAT |
| // element.removeAttribute('slot'); |
| } |
It would be handy, if we could choose between using shadow DOM and a simpler version without it. In the similar way we attach slots in connectedCallback, we could import the component itself into the the main document. Here is a very crude example of the custom element without shadowDOM.
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Slots Without Shadow Domain
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