[英]function to empty array doesn't work inside then()
以下是我从表单中添加数据的代码,当它捕获this.error的值时,该变量没有给出任何值。 我的代码行有问题吗?
saveContact: async function() {
this.errors = [];
if (this.name && this.phone) {
this.loading = !this.loading;
await addDoc(collection(db, "users"), {
id: this.id,
name: this.name,
phone: this.phone
}).then(() => {
this.name = ""
this.phone = ""
// This empty errors not working
this.errors = [];
}).catch((error) => {
this.error = error
});
}
if (!this.name) this.errors.push("name");
if (!this.phone) this.errors.push("phone");
}
this.error首先用于容纳将要发生的错误,然后如果firebase中的addDoc()函数成功,则then(), this.error = []变量被清空,这样错误消失,但不起作用。
由于您等待承诺,并且在this.phone
您正在清除this.name
和this.phone
- 等待承诺之后的代码将看到this.name
和this.phone
为空
添加注释以在您的代码中进行解释
saveContact: async function() {
this.errors = []; // you clear the errors
if (this.name && this.phone) {
this.loading = !this.loading;
await addDoc(collection(db, "users"), {
id: this.id,
name: this.name,
phone: this.phone
}).then(() => {
this.name = ""; // you empty the name
this.phone = ""; // you empty the phone
// This empty errors not working
this.errors = []; // you clear the errors for no reason
}).catch((error) => {
this.error = error
});
}
// here, name and phone will be empty, because you cleared them in the .then
if (!this.name) this.errors.push("name");
if (!this.phone) this.errors.push("phone");
}
一个修复 - else
最后一个代码块
saveContact: async function () {
this.errors = [];
if (this.name && this.phone) {
this.loading = !this.loading;
await addDoc(collection(db, "users"), {
id: this.id,
name: this.name,
phone: this.phone
}).then(() => {
this.name = "";
this.phone = "";
}).catch((error) => {
this.error = error
});
} else {
if (!this.name)
this.errors.push("name");
if (!this.phone)
this.errors.push("phone");
}
}
更好的修复,以及使用 async/await 的更好方法
saveContact: async function () {
this.errors = []; // you clear the errors
if (this.name && this.phone) {
this.loading = !this.loading;
try {
await addDoc(collection(db, "users"), {
id: this.id,
name: this.name,
phone: this.phone
});
this.name = "";
this.phone = "";
} catch {
this.error = error;
}
} else {
if (!this.name)
this.errors.push("name");
if (!this.phone)
this.errors.push("phone");
}
}
您可以尝试将“this”存储为某个变量
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