Created
June 19, 2017 22:42
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Fixing Quasar Infinite Scroll Component
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<template> | |
<div class="q-infinite-scroll"> | |
<div ref="content" class="q-infinite-scroll-content"> | |
<slot></slot> | |
</div> | |
<div class="q-infinite-scroll-message" v-show="fetching"> | |
<slot name="message"></slot> | |
</div> | |
</div> | |
</template> | |
<script> | |
// import { height, offset } from '../../quasar/quasar.es6' | |
// import { debounce } from '../../quasar/quasar.es6' | |
// import { getScrollTarget } from '../../quasar/quasar.es6' | |
function viewport () { | |
let | |
e = window, | |
a = 'inner'; | |
if (!('innerWidth' in window)) { | |
a = 'client'; | |
e = document.documentElement || document.body; | |
} | |
return { | |
width: e[a + 'Width'], | |
height: e[a + 'Height'] | |
} | |
} | |
function height (el) { | |
if (el === window) { | |
return viewport().height | |
} | |
return parseFloat(window.getComputedStyle(el).getPropertyValue('height'), 10) | |
} | |
let now = Date.now; | |
function debounce (fn, wait = 250, immediate) { | |
let | |
timeout, params, context, timestamp, result, | |
later = () => { | |
let last = now() - timestamp; | |
if (last < wait && last >= 0) { | |
timeout = setTimeout(later, wait - last); | |
} | |
else { | |
timeout = null; | |
if (!immediate) { | |
result = fn.apply(context, params); | |
if (!timeout) { | |
context = params = null; | |
} | |
} | |
} | |
}; | |
return function (...args) { | |
var callNow = immediate && !timeout; | |
context = this; | |
timestamp = now(); | |
params = args; | |
if (!timeout) { | |
timeout = setTimeout(later, wait); | |
} | |
if (callNow) { | |
result = fn.apply(context, args); | |
context = params = null; | |
} | |
return result | |
} | |
} | |
function getScrollTarget (el) { | |
return el.closest('.layout-view,.scroll') || window | |
} | |
function offset (el) { | |
if (el === window) { | |
return {top: 0, left: 0} | |
} | |
let {top, left} = el.getBoundingClientRect(); | |
return {top, left} | |
} | |
export default { | |
name: 'fixInfiniteScroll', | |
props: { | |
handler: { | |
type: Function, | |
required: true | |
}, | |
inline: Boolean, | |
offset: { | |
type: Number, | |
default: 0 | |
} | |
}, | |
data () { | |
return { | |
index: 0, | |
fetching: false, | |
working: true | |
} | |
}, | |
methods: { | |
poll () { | |
if (this.fetching || !this.working) { | |
return | |
} | |
let | |
containerHeight = height(this.scrollContainer), | |
containerBottom = offset(this.scrollContainer).top + containerHeight, | |
triggerPosition = offset(this.element).top + height(this.element) - (this.offset || containerHeight) | |
if (triggerPosition < containerBottom) { | |
this.loadMore() | |
} | |
}, | |
loadMore () { | |
if (this.fetching || !this.working) { | |
return | |
} | |
this.index+=2 | |
this.fetching = true | |
this.handler("quasar", "vuejs") | |
}, | |
reset () { | |
this.index = 0 | |
}, | |
resume () { | |
this.working = true | |
this.scrollContainer.addEventListener('scroll', this.poll) | |
this.poll() | |
}, | |
stop () { | |
this.working = false | |
this.fetching = false | |
this.scrollContainer.removeEventListener('scroll', this.poll) | |
} | |
}, | |
mounted () { | |
this.$nextTick(() => { | |
this.poll = debounce(this.poll, 50) | |
this.element = this.$refs.content | |
this.scrollContainer = this.inline ? this.$el : getScrollTarget(this.$el) | |
if (this.working) { | |
this.scrollContainer.addEventListener('scroll', this.poll) | |
} | |
this.poll() | |
}) | |
}, | |
beforeDestroy () { | |
this.scrollContainer.removeEventListener('scroll', this.poll) | |
} | |
} | |
</script> |
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