加载新数据时删除d3火焰图

Question

最近我选择了一个项目，该项目上有d3-flame-graph，图形根据另一个组件上定义的过滤器显示。我的问题是，当使用新参数搜索时，我似乎无法清理以前的图表，我想知道是否有人能帮助我。基本上，我现在拥有的是，当我第一次进入页面时，加载组件，然后我有我的图表，当我搜索新日期时，我有加载组件，但除此之外，我仍然有以前的图表

我想我可以在const updateGraph上使用flamegraph().destroy()，但什么也没发生

import React, { FC, useEffect, useRef, useState, useCallback } from 'react'
import { useParams } from 'react-router-dom'
import moment from 'moment'
import * as d3 from 'd3'
import { flamegraph } from 'd3-flame-graph'
import Filters, { Filter } from '../../../../../../components/Filters'
import { getFlamegraph } from '../../../../../../services/flamegraph'
import { useQueryFilter } from '../../../../../../hooks/filters'
import FlamegraphPlaceholder from '../../../../../../components/Placeholders/Flamegraph'
import css from './flamegraph.module.css'
import ToastContainer, {
useToastContainerMessage,
} from '../../../../../../components/ToastContainer'
const defaultFilters = {
startDate: moment().subtract(1, 'month'),
endDate: moment(),
text: '',
limit: 10,
}
const getOffSet = (divElement: HTMLDivElement | null) => {
if (divElement !== null) {
const padding = 100
const minGraphHeight = 450
// ensure that the graph has a min height
return Math.max(
window.innerHeight - divElement.offsetTop - padding,
minGraphHeight
)
} else {
const fallBackNavigationHeight = 300
return window.innerHeight - fallBackNavigationHeight
}
}
const Flamegraph: FC = () => {
const [queryFilters, setQueryFilters] = useQueryFilter(defaultFilters)
const [fetching, setFetching] = useState(false)
const [graphData, setGraphData] = useState()
const {
messages: toastMessages,
addMessage: addMessageToContainer,
removeMessage: removeMessageFromContainer,
} = useToastContainerMessage()
const flameContainerRef = useRef<HTMLDivElement | null>(null)
const flameRef = useRef<HTMLDivElement | null>(null)
const graphRef = useRef<any>()
const graphDataRef = useRef<any>()
const timerRef = useRef<any>()
const { projectId, functionId } = useParams()
let [sourceId, sourceLine] = ['', '']
if (functionId) {
;[sourceId, sourceLine] = functionId.split(':')
}
const createGraph = () => {
if (flameContainerRef.current && flameRef.current) {
graphRef.current = flamegraph()
.width(flameContainerRef.current.offsetWidth)
.height(getOffSet(flameRef.current))
.cellHeight(30)
.tooltip(false)
.setColorMapper(function(d, originalColor) {
// Scale green component proportionally to box width (=> the wider the redder)
let greenHex = (192 - Math.round((d.x1 - d.x0) * 128)).toString(16)
return '#FF' + ('0' + greenHex).slice(-2) + '00'
})
}
}
const updateGraph = (newData: any) => {
setGraphData(newData)
graphDataRef.current = newData
if (graphRef.current) {
if (newData === null) {
graphRef.current.destroy()
graphRef.current = null
} else {
d3.select(flameRef.current)
.datum(newData)
.call(graphRef.current)
}
}
}
const fetchGraph = (filters: Filter) => {
setFetching(true)
getFlamegraph(
Number(projectId),
filters.startDate ? filters.startDate.unix() : 0,
filters.endDate ? filters.endDate.unix() : 0,
sourceId,
sourceLine
)
.then(graphData => {
if (!graphRef.current) {
createGraph()
}
updateGraph(graphData)
})
.catch(({ response }) => {
updateGraph(null)
if (response.data) {
addMessageToContainer(response.data.message, true)
}
})
.finally(() => {
setFetching(false)
})
}
const onResize = useCallback(() => {
clearTimeout(timerRef.current)
timerRef.current = setTimeout(() => {
if (graphRef.current && flameContainerRef.current) {
graphRef.current.width(flameContainerRef.current.offsetWidth)
d3.select(flameRef.current)
.datum(graphDataRef.current)
.call(graphRef.current)
}
}, 500)
}, [])
useEffect(() => {
fetchGraph(queryFilters)
window.addEventListener('resize', onResize)
return () => {
window.removeEventListener('resize', onResize)
}
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [])
const onChangeFilters = (filters: Filter) => {
setQueryFilters(filters)
fetchGraph(filters)
}
return (
<div className={css.host}>
<Filters
defaultValues={queryFilters}
searching={fetching}
onSearch={onChangeFilters}
/>
<div className={css.flameBox}>
<div className={css.flameContainer} ref={flameContainerRef}>
<div ref={flameRef} />
</div>
{fetching || !graphData ? (
<FlamegraphPlaceholder loading={fetching} />
) : null}
</div>
<ToastContainer
messages={toastMessages}
toastDismissed={removeMessageFromContainer}
/>
</div>
)
}
export default Flamegraph

Answer 1

首先，flamegraph()创建一个新的flamegraph实例，您需要使用graphref.current.destroy()。其次，你不想在数据已经加载时销毁它，而是在数据开始加载时销毁，对吧？因为这是一项需要时间的手术。

考虑以下内容：

const cleanGraph = () => {
if (graphref.current !== undefined) {
graphref.current.destroy()
}
}
const fetchGraph = (filters: Filter) => {
setFetching(true)
cleanGraph()
getFlamegraph(
Number(projectId),
filters.startDate ? filters.startDate.unix() : 0,
filters.endDate ? filters.endDate.unix() : 0,
sourceId,
sourceLine
)
...
}