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attributes.ts
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attributes.ts
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import { VNode, VNodeData } from '../vnode'
import { Module } from './module'
export type Attrs = Record<string, string | number | boolean>
const xlinkNS = 'http://www.w3.org/1999/xlink'
const xmlNS = 'http://www.w3.org/XML/1998/namespace'
const colonChar = 58
const xChar = 120
function updateAttrs (oldVnode: VNode, vnode: VNode): void {
var key: string
var elm: Element = vnode.elm as Element
var oldAttrs = (oldVnode.data as VNodeData).attrs
var attrs = (vnode.data as VNodeData).attrs
if (!oldAttrs && !attrs) return
if (oldAttrs === attrs) return
oldAttrs = oldAttrs || {}
attrs = attrs || {}
// update modified attributes, add new attributes
for (key in attrs) {
const cur = attrs[key]
const old = oldAttrs[key]
if (old !== cur) {
if (cur === true) {
elm.setAttribute(key, '')
} else if (cur === false) {
elm.removeAttribute(key)
} else {
if (key.charCodeAt(0) !== xChar) {
elm.setAttribute(key, cur as any)
} else if (key.charCodeAt(3) === colonChar) {
// Assume xml namespace
elm.setAttributeNS(xmlNS, key, cur as any)
} else if (key.charCodeAt(5) === colonChar) {
// Assume xlink namespace
elm.setAttributeNS(xlinkNS, key, cur as any)
} else {
elm.setAttribute(key, cur as any)
}
}
}
}
// remove removed attributes
// use `in` operator since the previous `for` iteration uses it (.i.e. add even attributes with undefined value)
// the other option is to remove all attributes with value == undefined
for (key in oldAttrs) {
if (!(key in attrs)) {
elm.removeAttribute(key)
}
}
}
export const attributesModule: Module = { create: updateAttrs, update: updateAttrs }
export default attributesModule