[英]How to wait for Firebase storage image upload, then run next function
我正在尝试编写一个函数,将多个图像上传到 Firebase,保存返回给对象的 URL,然后将该对象上传到我的 Cloud Firestore。 我对 async/await 或 promises 并没有真正的了解,所以如果有人能提供帮助,我将不胜感激。
基本上,我希望uploadImages()
完成运行,然后运行uploadData()
,其中saveIssue()
在提交表单时被触发。
这是我正在使用的内容:
saveIssue() {
this.uploadImages();
this.uploadData();
},
uploadData() {
let self = this;
db.collection("issues")
.add(self.issue)
.then(docRef => {
self.$router.push({
name: "ReportPage",
params: { issueId: docRef.id }
});
})
.catch(error => {
console.error(error);
});
},
uploadImages() {
const storageRef = storage.ref();
let self = this;
this.imagePreviews.forEach(image => {
let imageName = uuidv1();
let fileExt = image.fileName.split(".").pop();
let uploadTask = storageRef
.child(`images/${imageName}.${fileExt}`)
.putString(image.base64String, "data_url");
uploadTask.on("state_changed", {
error: error => {
console.error(error);
},
complete: () => {
uploadTask.snapshot.ref.getDownloadURL().then(downloadURL => {
self.issue.images.push(downloadURL);
});
}
});
});
},
您必须使用承诺,如解释here 。 您可以重写代码以支持异步等待,因为 firebase 支持它开箱即用,但一开始它可以是这样的:
async saveIssue() { await this.uploadImages(); await this.uploadData(); }, uploadData() { return new Promise((resolve, reject) => { let self = this; db.collection("issues") .add(self.issue) .then(docRef => { self.$router.push({ name: "ReportPage", params: { issueId: docRef.id } }); resolve(); }) .catch(error => { console.error(error); reject(error); }); }) }, uploadImages() { return new Promise((resolve, reject) => { const storageRef = storage.ref(); let self = this; this.imagePreviews.forEach(image => { let imageName = uuidv1(); let fileExt = image.fileName.split(".").pop(); let uploadTask = storageRef .child(`images/${imageName}.${fileExt}`) .putString(image.base64String, "data_url"); uploadTask.on("state_changed", { error: error => { console.error(error); reject(error); }, complete: () => { uploadTask.snapshot.ref.getDownloadURL().then(downloadURL => { self.issue.images.push(downloadURL); resolve(); }); } }); }); }) },
好的,我根据@AlexBrohshtut 的回答找到了一个解决方案。 我仍然有一个问题,第一个循环完成将允许等待继续,下面的代码似乎解决了这个问题。 如果有人有更简洁的答案,很高兴更新! (我充其量只是中级...)
saveIssue() {
Promise.all(
this.imagePreviews.map(async image => {
return await this.uploadImages(image);
})
).then(() => {
this.uploadData();
});
},
uploadData() {
let self = this;
db.collection("issues")
.add(self.issue)
.then(docRef => {
self.$router.push({
name: "ReportPage",
params: {
issueId: docRef.id
}
});
})
.catch(error => {
console.error(error);
});
},
uploadImages(image) {
const storageRef = storage.ref();
let self = this;
return new Promise((resolve, reject) => {
let imageName = uuidv1();
let fileExt = image.fileName.split(".").pop();
let uploadTask = storageRef
.child(`images/${imageName}.${fileExt}`)
.putString(image.base64String, "data_url");
uploadTask.on("state_changed", {
error: error => {
console.error(error);
reject(error);
},
complete: () => {
uploadTask.snapshot.ref.getDownloadURL().then(downloadURL => {
self.issue.images.push(downloadURL);
resolve();
});
}
});
});
}
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