angular

问题 With RxJS Observables within Angular this.myService.getEmp(personEmpId).subscribe( result => { this.personName = result.person_name; }, error => { console.log("EE:",error); } ); How can I test if my subscription to this service returns a NULL result, i.e. no record was found at all? I tried adding the error part but this did not fire the console message. At the moment, I seem to be getting the following error message: ERROR TypeError: "result is null" 回答1: You can add a filter before

问题 I've been trying to find this answer for a while now, but I, as a new person to RxJS and Angular (2+), am looking for a way to combine the results of two HTTP GET calls. Once one call has finished, a new call has to be done based on that result. The result of the first call will be combined with the second call. Preferably in a property which has an object as type. I have been playing with mergeMap , switchMap and concatMap . According to the documentation and guides these functions should do

问题 Angular 2,4 formbuilder setvalue() is not working as expected when used on dropdown selects. I have the following dropdown select that gets populated with Github organizations: <select name="org" formControlName="organizations"> <option *ngFor="let org of organizations" [ngValue]="org">{{org.organization.login}}</option> </select> Here is the javascript code that sets the Github organization that should be selected. this.pipelineForm = fb.group({ name:'', organizations:'', repos: '', branches

问题 Angular 2,4 formbuilder setvalue() is not working as expected when used on dropdown selects. I have the following dropdown select that gets populated with Github organizations: <select name="org" formControlName="organizations"> <option *ngFor="let org of organizations" [ngValue]="org">{{org.organization.login}}</option> </select> Here is the javascript code that sets the Github organization that should be selected. this.pipelineForm = fb.group({ name:'', organizations:'', repos: '', branches

问题 Let's say you have the following structure: shopping-carts (collection) - shopping-cart 1(doc) -- dateCreated (field) -- items (collection) - shopping-cart 2(doc -- dateCreated -- items . . . So, how would we go about getting the entire shopping-cart(doc) as an ShoppingCart object that we defined as export interface ShoppingCart { items: ShoppingCartItem[] dateCreated: string } afs.doc('shopping-cart/id').valueChanges() only returns the dateCreated afs.doc('shopping-cart/id').collection(

问题 I have a project that I've been working with for quite some time and it has built and compiled (and still does on a different machine) for months. Now, when I run the command npm install it runs as normal, but at the end of the process, it builds out tons of .cmd files (and another accompanying file) in the root folder of my project. when I run ng serve i get the error: Unknown browser query basedir=$(dirname "$(echo "$0" | sed -e 's,\\,/,g')") I'm completely stumped as to how to get my

问题 How can i flash cell in table that changed its value? <tr *ngFor="#product of products" (click)="onSelect(product)"> <td>{{product.productName}}</td> <td>{{product.price}}</td> </tr> in component i have input for products : @Input() products:Array<ProductModel>; and there is a test timer in parent component that change random product`s price every 3 seconds: var timer = Observable.timer(2000, 3000); timer.subscribe(t => this._changeRandomProduct()); private _changeRandomProduct() { var

问题 I'll start this question from notion that I've seen a similar question on StackOverflow , but that question had only answer for the difference . What I'm asking is what should I use depending on situation and what drawbacks one or another method may have . I know that detectChanges runs immediate change detection cycle on an element and its children, meanwhile markForCheck only marks current element and its ancestors as dirty and that they should be checked on the next change detection cycle.

问题 I am trying to find how to use the Google Sheets API in Angular. There is no reference to Angular on the documentation page. I have tried this and it doesn't seem to be working. Can someone direct me on how I can use the Google Sheets API inside of my Angular application? I am currently using Angular 8 回答1: I made an Angular library exactly for this use case! With ng-google-sheets-db you can load data from Google Sheets in a breeze. You may check out the Stackblitz example app. Installation

问题 I am trying to find how to use the Google Sheets API in Angular. There is no reference to Angular on the documentation page. I have tried this and it doesn't seem to be working. Can someone direct me on how I can use the Google Sheets API inside of my Angular application? I am currently using Angular 8 回答1: I made an Angular library exactly for this use case! With ng-google-sheets-db you can load data from Google Sheets in a breeze. You may check out the Stackblitz example app. Installation