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"version": "0.5.3", + "version": "0.6.0", "description": "A low-code library that simplifies the creation of native DOM elements/components using small wrappers and tweaks.", "author": "Jan Andrle ", "license": "MIT", @@ -63,7 +63,7 @@ }, { "path": "./signals.js", - "limit": "8 kB", + "limit": "8.5 kB", "gzip": false }, { @@ -73,7 +73,7 @@ }, { "path": "./examples/components/webComponent.js", - "limit": "12kb", + "limit": "12.5 kB", "gzip": false } ], diff --git a/src/signals-lib.js b/src/signals-lib.js index 25545fb..dccc154 100644 --- a/src/signals-lib.js +++ b/src/signals-lib.js @@ -8,7 +8,9 @@ export function isSignal(candidate){ const stack_watch= []; /** * ### `WeakMap>>` - * The `Set` is in the form of `[ source, ...depended signals (DSs) ]`. When the DS is cleaned it is removed from DSs, if remains only one (`source`) it is cleared too. + * The `Set` is in the form of `[ source, ...depended signals (DSs) ]`. + * When the DS is cleaned (`S.clear`) it is removed from DSs, + * if remains only one (`source`) it is cleared too. * ### `WeakMap` * This is used for revesed deps, the `function` is also key for `deps`. * @type {WeakMap>|function>} @@ -62,18 +64,34 @@ S.symbols= { }; import { on } from "./events.js"; import { scope } from "./dom.js"; +const key_attributes= "__dde_attributes"; S.attribute= function(name, initial= undefined){ - const { host }= scope; - const value= host() && host().hasAttribute(name) ? host().getAttribute(name) : initial; - const ac= new AbortController(); - const out= S(value, { - [S.symbols.onclear](){ ac.abort(); } + const out= S(initial); + scope.host(element=> { + if(element instanceof HTMLElement){ + if(element.hasAttribute(name)) out(element.getAttribute(name)); + } else { + if(element.hasAttributeNS(null, name)) out(element.getAttributeNS(null, name)); + } + if(element[key_attributes]){ + element[key_attributes][name]= out; + return; + } + element[key_attributes]= { [name]: out }; + on.attributeChanged(function attributeChangeToSignal({ detail }){ + /*! This maps attributes to signals (`S.attribute`). + * Investigate `__dde_attributes` key of the element.*/ + const [ name, value ]= detail; + const curr= element[key_attributes][name]; + if(curr) curr(value); + })(element); + on.disconnected(function(){ + /*! This removes all signals mapped to attributes (`S.attribute`). + * Investigate `__dde_attributes` key of the element.*/ + S.clear(...Object.values(element[key_attributes])); + })(element); + return element; }); - scope.host(on.attributeChanged(function attributeChangeToSignal({ detail }){ - const [ name_c, value ]= detail; - if(name_c!==name) return; - out(value); - }, { signal: ac.signal })); return out; }; S.clear= function(...signals){ @@ -182,11 +200,16 @@ function toSignal(signal, value, actions){ Reflect.deleteProperty(actions, ocs); } const { host }= scope; - signal[mark]= { - value, actions, onclear, host, - listeners: new Set(), - defined: new SignalDefined() - }; + Reflect.defineProperty(signal, mark, { + value: { + value, actions, onclear, host, + listeners: new Set(), + defined: new SignalDefined() + }, + enumerable: false, + writable: false, + configurable: true + }); signal.toJSON= ()=> signal(); Object.setPrototypeOf(signal[mark], protoSigal); return signal;