4cd4fd28
 郭伟龙
feat: 初始化项目
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/**
* Not type checking this file because flow doesn't like attaching
* properties to Elements.
*/
import { isTextInputType } from 'web/util/element'
import { looseEqual, looseIndexOf } from 'shared/util'
import { mergeVNodeHook } from 'core/vdom/helpers/index'
import { warn, isIE9, isIE, isEdge } from 'core/util/index'
/* istanbul ignore if */
if (isIE9) {
// http://www.matts411.com/post/internet-explorer-9-oninput/
document.addEventListener('selectionchange', () => {
const el = document.activeElement
// @ts-expect-error
if (el && el.vmodel) {
trigger(el, 'input')
}
})
}
const directive = {
inserted(el, binding, vnode, oldVnode) {
if (vnode.tag === 'select') {
// #6903
if (oldVnode.elm && !oldVnode.elm._vOptions) {
mergeVNodeHook(vnode, 'postpatch', () => {
directive.componentUpdated(el, binding, vnode)
})
} else {
setSelected(el, binding, vnode.context)
}
el._vOptions = [].map.call(el.options, getValue)
} else if (vnode.tag === 'textarea' || isTextInputType(el.type)) {
el._vModifiers = binding.modifiers
if (!binding.modifiers.lazy) {
el.addEventListener('compositionstart', onCompositionStart)
el.addEventListener('compositionend', onCompositionEnd)
// Safari < 10.2 & UIWebView doesn't fire compositionend when
// switching focus before confirming composition choice
// this also fixes the issue where some browsers e.g. iOS Chrome
// fires "change" instead of "input" on autocomplete.
el.addEventListener('change', onCompositionEnd)
/* istanbul ignore if */
if (isIE9) {
el.vmodel = true
}
}
}
},
componentUpdated(el, binding, vnode) {
if (vnode.tag === 'select') {
setSelected(el, binding, vnode.context)
// in case the options rendered by v-for have changed,
// it's possible that the value is out-of-sync with the rendered options.
// detect such cases and filter out values that no longer has a matching
// option in the DOM.
const prevOptions = el._vOptions
const curOptions = (el._vOptions = [].map.call(el.options, getValue))
if (curOptions.some((o, i) => !looseEqual(o, prevOptions[i]))) {
// trigger change event if
// no matching option found for at least one value
const needReset = el.multiple
? binding.value.some(v => hasNoMatchingOption(v, curOptions))
: binding.value !== binding.oldValue &&
hasNoMatchingOption(binding.value, curOptions)
if (needReset) {
trigger(el, 'change')
}
}
}
}
}
function setSelected(el, binding, vm) {
actuallySetSelected(el, binding, vm)
/* istanbul ignore if */
if (isIE || isEdge) {
setTimeout(() => {
actuallySetSelected(el, binding, vm)
}, 0)
}
}
function actuallySetSelected(el, binding, vm) {
const value = binding.value
const isMultiple = el.multiple
if (isMultiple && !Array.isArray(value)) {
__DEV__ &&
warn(
`<select multiple v-model="${binding.expression}"> ` +
`expects an Array value for its binding, but got ${Object.prototype.toString
.call(value)
.slice(8, -1)}`,
vm
)
return
}
let selected, option
for (let i = 0, l = el.options.length; i < l; i++) {
option = el.options[i]
if (isMultiple) {
selected = looseIndexOf(value, getValue(option)) > -1
if (option.selected !== selected) {
option.selected = selected
}
} else {
if (looseEqual(getValue(option), value)) {
if (el.selectedIndex !== i) {
el.selectedIndex = i
}
return
}
}
}
if (!isMultiple) {
el.selectedIndex = -1
}
}
function hasNoMatchingOption(value, options) {
return options.every(o => !looseEqual(o, value))
}
function getValue(option) {
return '_value' in option ? option._value : option.value
}
function onCompositionStart(e) {
e.target.composing = true
}
function onCompositionEnd(e) {
// prevent triggering an input event for no reason
if (!e.target.composing) return
e.target.composing = false
trigger(e.target, 'input')
}
function trigger(el, type) {
const e = document.createEvent('HTMLEvents')
e.initEvent(type, true, true)
el.dispatchEvent(e)
}
export default directive
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