How to fix Angular ‘TypeError: templateRef.createEmbeddedView is not a function’

Problem:

You encounter an error message like this:

ERROR TypeError: templateRef.createEmbeddedView is not a function
    at ViewContainerRef_.createEmbeddedView (core.js:11389)
    at NgIf._updateView (common.js:2843)
    at NgIf.set [as ngIfElse] (common.js:2815)
    at updateProp (core.js:12602)
    at checkAndUpdateDirectiveInline (core.js:12313)
    at checkAndUpdateNodeInline (core.js:13876)
    at checkAndUpdateNode (core.js:13819)
    at debugCheckAndUpdateNode (core.js:14712)
    at debugCheckDirectivesFn (core.js:14653)
    at Object.eval [as updateDirectives] (MyComponent.html:1)

in a component where you have a source code similar to this

<div *ngIf="myCondition ; else elseSection">
    <!-- ... -->
</div>
<div #elseSection>
    <!-- ... -->
</div>

Solution:

Whatever element you reference in the *ngIf else clause can’t be any arbitrary component, but it must be a ng-template.

In order to solve this, change <div #elseSection> to <ng-template #elseSection>. Note that using just <template> is deprecated since Angular4.

The resulting source code should look like this:

<div *ngIf="myCondition ; else elseSection">
    <!-- ... -->
</div>
<ng-template #elseSection>
    <!-- ... -->
</ng-template>

How to fix Angular ‘Cannot find control with unspecified name attribute’

Problem:

In your Angular2/4/5 application you see this error message:

Cannot find control with unspecified name attribute

Solution:

Look for a statement in the HTML angular template like this:

[formControl]="myCtrl"

The error message means that myCtrl can’t be found. Check if this variable is present in your class – it needs be a FormControl which you can import from @angular/forms:

import { FormControl } from '@angular/forms';

In my case, changing it to

[formControl]="myControl"

fixed the issue

How to fix Angular4/5/6 ‘No provider for ControlContainer’

Problem:

In your Angular2/4/5 application you’re getting the following error message:

No provider for ControlContainer ("<div class="recall-container mat-elevation-z8">

Solution:

You have not added the @angular/forms FormsModule to your module’s import list.

Go to your app.module.ts and add this line to the imports:

import { FormsModule } from '@angular/forms';

and look for a line like this in your module definition:

imports: [ /* several import modules may be listed here */ ],

and add FormsModule like this (if there are already imports, add FormsModule to the list):

imports: [ FormsModule ],

How to use query string parameters in NodeJS request

Problem:

You’re using the request library in order to make a HTTP GET request:

const request = require("request")

request.get("http://localhost:8000", function(err, response, body) {
    console.log(err, body);
})

Now you’re trying to add query parameters to the request. For this example, we’ll assume that you want to add one parameter: foo=bar

Solution:

You can use the qs parameter like this:

const request = require("request")

request.get({url: "http://localhost:8000", qs: {"foo": "bar"}}, function(err, response, body) {
    console.log(err, body);
})

Note that just adding a qs parameter to request.get won’t work, you need to have a dictionary as first argument that contains at least {"url": <your URL>, "qs": {<one or multiple query parameters>}}

Credits to Daniel at StackOverflow

Disabling SSL certificate checking in unirest (NodeJS)

Problem:

You want to make a HTTP request with unirest like this:

const unirest = require('unirest');
unirest.get("https://mydomain.net").end(console.log)

but you encounter the following error:

{ error: 
   { Error: unable to verify the first certificate
       at TLSSocket.<anonymous> (_tls_wrap.js:1088:38)
       at emitNone (events.js:86:13)
       at TLSSocket.emit (events.js:188:7)
       at TLSSocket._finishInit (_tls_wrap.js:610:8)
       at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:440:38) code: 'UNABLE_TO_VERIFY_LEAF_SIGNATURE' } }

 Solution:

You can work around this problem by using strictSSL(false) like this:

const unirest = require('unirest');

unirest.get("https://mydomain.net")
.strictSSL(false)
.end(console.log)

Note however that this might have negative effects on the security of your application as this request will be vulnerable to man-in-the-middle attacks.