attrs.js
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/* @flow */
import { extend } from 'shared/util'
import { isIE9 } from 'core/util/env'
import {
isBooleanAttr,
isEnumeratedAttr,
isXlink,
xlinkNS,
getXlinkProp,
isFalsyAttrValue
} from 'web/util/index'
function updateAttrs (oldVnode: VNodeWithData, vnode: VNodeWithData) {
if (!oldVnode.data.attrs && !vnode.data.attrs) {
return
}
let key, cur, old
const elm = vnode.elm
const oldAttrs = oldVnode.data.attrs || {}
let attrs: any = vnode.data.attrs || {}
// clone observed objects, as the user probably wants to mutate it
if (attrs.__ob__) {
attrs = vnode.data.attrs = extend({}, attrs)
}
for (key in attrs) {
cur = attrs[key]
old = oldAttrs[key]
if (old !== cur) {
setAttr(elm, key, cur)
}
}
// #4391: in IE9, setting type can reset value for input[type=radio]
/* istanbul ignore if */
if (isIE9 && attrs.value !== oldAttrs.value) {
setAttr(elm, 'value', attrs.value)
}
for (key in oldAttrs) {
if (attrs[key] == null) {
if (isXlink(key)) {
elm.removeAttributeNS(xlinkNS, getXlinkProp(key))
} else if (!isEnumeratedAttr(key)) {
elm.removeAttribute(key)
}
}
}
}
function setAttr (el: Element, key: string, value: any) {
if (isBooleanAttr(key)) {
// set attribute for blank value
// e.g. <option disabled>Select one</option>
if (isFalsyAttrValue(value)) {
el.removeAttribute(key)
} else {
el.setAttribute(key, key)
}
} else if (isEnumeratedAttr(key)) {
el.setAttribute(key, isFalsyAttrValue(value) || value === 'false' ? 'false' : 'true')
} else if (isXlink(key)) {
if (isFalsyAttrValue(value)) {
el.removeAttributeNS(xlinkNS, getXlinkProp(key))
} else {
el.setAttributeNS(xlinkNS, key, value)
}
} else {
if (isFalsyAttrValue(value)) {
el.removeAttribute(key)
} else {
el.setAttribute(key, value)
}
}
}
export default {
create: updateAttrs,
update: updateAttrs
}