avalon2
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an elegant efficient express mvvm framework
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<a href="../index.html">all files</a> / <a href="index.html">directives/</a> if.js
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<span class="strong">100% </span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { avalon, createAnchor } from '../seed/core'
avalon.directive('if', {
delay: true,
priority: 5,
init: function() {
this.placeholder = createAnchor('if')
var props = this.node.props
delete props['ms-if']
delete props[':if']
this.fragment = avalon.vdom(this.node, 'toHTML')
},
diff: function(newVal, oldVal) {
var n = !!newVal
if (oldVal === void 0 || n !== oldVal) {
this.value = n
return true
}
},
update: function(vdom, value) {
if (this.isShow === void 0 && value) {
continueScan(this, vdom)
return
}
this.isShow = value
var placeholder = this.placeholder
if (value) {
var p = placeholder.parentNode
continueScan(this, vdom)
p && p.replaceChild(vdom.dom, placeholder)
} else { //移除DOM
this.beforeDispose()
vdom.nodeValue = 'if'
vdom.nodeName = '#comment'
delete vdom.children
var dom = vdom.dom
var p = dom && dom.parentNode
vdom.dom = placeholder
if (p) {
p.replaceChild(placeholder, dom)
}
}
},
beforeDispose: function(){
if (this.innerRender) {
this.innerRender.dispose()
}
}
})
function continueScan(instance, vdom) {
var innerRender = instance.innerRender = avalon.scan(instance.fragment, instance.vm)
avalon.shadowCopy(vdom, innerRender.root)
delete vdom.nodeValue
}</pre></td></tr>
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Code coverage
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