我正在尝试创建一个下载资产列表的主题,该主题为每个资产发送动作,如果可能的话,使用主题主题?
{{1}}
文件似乎确实正在下载等。我可以控制台记录进度-尝试映射结果时,什么都不会触发。
这是因为我从订阅开始吗?
答案 0 :(得分:1)
可以像下面进一步简化它,并像downloadGuideAssets().subscribe()
一样使用它,您实际上并不需要主题
function downloadGuideAssets(){
return getAssetList().map((asset) => downloadAsset(asset))
}
function downloadAsset({id,src}){
return Observable.create(obs=>{
window.resolveLocalFileSystemURL(cordova.file.dataDirectory, dirEntry => {
dirEntry.getFile(src.substring(src.lastIndexOf('/')+1),{create:true, exclusive:false}, f => {
fetch(src).then(fetchProgress({onProgress(progress) {subject$.next({id,progress})}}))
.then(res => res.blob())
.then(blob =>
f.createWriter(writer => {
writer.onwriteend = ()=> obs.next({id,complete:true})
writer.write(blob)
}))
.catch(err => obs.error({id,error:err}))
}, err => obs.error({id,error:err}) )
})
})
}
答案 1 :(得分:0)
我最终只做了一个主题,就把它退了
function downloadGuideAssets(){
const subject$ = new Subject()
getAssetList().map((asset) => downloadAsset(asset,subject$))
return subject$.asObservable()
}
function downloadAsset({id,src},subject$){
window.resolveLocalFileSystemURL(cordova.file.dataDirectory, dirEntry => {
dirEntry.getFile(src.substring(src.lastIndexOf('/')+1),{create:true, exclusive:false}, f => {
fetch(src).then(fetchProgress({onProgress(progress) {subject$.next({id,progress})}}))
.then(res => res.blob())
.then(blob =>
f.createWriter(writer => {
writer.onwriteend = ()=> subject$.next({id,complete:true})
writer.write(blob)
}))
.catch(err => subject$.next({id,error:err}))
}, err => subject$.next({id,error:err}) )
})
}