我在函数中有这段代码:
this.apiService.fetchCategories(!this.cacheData).subscribe(
response => {
if(this._jsnValService.valCategories(response)) {
this.customerMap.categories = this.formatCategories(response["categories"]);
} else {
alert("Categories failed the schema validation. Please contact support if this happens again.");
}
},
error => {
this.notification.title = "Oops, there's a problem.";
this.notification.content = "Seems there's an issue getting the provider categories.";
this.notification.show("provider_categories_api");
}
);
它获取一些数据,然后对数据(if(this._jsnValService.valCategories(response)) {
)运行验证。
但是,我对数据的验证实际上也是异步的,因为它根据一个单独的json文件中的json模式验证它,因此它必须首先读取该文件。
我使用了承诺来读取文件内容,然后进行验证:
@Injectable()
export class ValidateJSONSchemaService {
constructor(private http: Http) {}
public valCategories(json) {
this._getSchema("./jsonSchema.categories.json").then((schema) => {
this._valSchema(json, schema);
});
};
private _valSchema(json, schema): any {
var ajv = new Ajv();
var valid = ajv.validate(schema, json);
if (!valid) {
console.log(ajv.errors);
return false;
} else {
console.log(valid);
return true;
};
};
private _getSchema(fileName): any {
return new Promise((resolve, reject) => {
this.http.get(fileName)
.map(this._extractData)
.catch(this._handleError)
.subscribe(schema => resolve(schema));
});
};
private _extractData(res: Response) {
let body = res.json();
return body.data || {};
};
如何编辑此问题中的顶部代码块以考虑if语句中的异步函数(if(this._jsnValService.valCategories(response)) {
)?
答案 0 :(得分:0)
如果您使用的是ES6,可以像这样使用async / await:
node
如果没有,你的函数fetchCategories应该返回一个promise或允许你传递一个回调来做这样的事情:
async function _validateCategories() {
this.apiService.fetchCategories(!this.cacheData).subscribe(
response => {
const valid = await this._jsnValService.valCategories(response)
if(valid) {
this.customerMap.categories = this.formatCategories(response["categories"]);
} else {
alert("Categories failed the schema validation. Please contact support if this happens again.");
}
},
error => {
this.notification.title = "Oops, there's a problem.";
this.notification.content = "Seems there's an issue getting the provider categories.";
this.notification.show("provider_categories_api");
}
);
}