ANGULAR 15 - How to find component by selector?

The process of finding an Angular component by selector in later versions should be quite similar to the earlier versions.


In Angular, you can use `ViewContainerRef` and `ComponentFactoryResolver` to dynamically create and find components by their selector. Here's a general approach:


1. **Import Required Modules**:

   Ensure you have imported the necessary modules in your component where you want to find the component.


   ```typescript

   import { ComponentFactoryResolver, ViewContainerRef } from '@angular/core';

   ```


2. **Component Creation**:

   To create a component dynamically, you can use the `ComponentFactoryResolver`. Here's an example of how to create a component dynamically:


   ```typescript

   import { ComponentFactoryResolver, ViewContainerRef, ComponentRef } from '@angular/core';


   export class YourComponent {

     constructor(private resolver: ComponentFactoryResolver, private viewContainerRef: ViewContainerRef) {}


     createComponent(componentType: Type<any>): ComponentRef<any> {

       const factory = this.resolver.resolveComponentFactory(componentType);

       return factory.create(this.viewContainerRef.injector);

     }

   }

   ```


3. **Find a Component by Selector**:

   To find a component by its selector, you can query the DOM. You can use Angular's `Renderer2` to access the DOM. Here's an example:


   ```typescript

   import { Component, ElementRef, Renderer2 } from '@angular/core';


   @Component({

     selector: 'app-your-component',

     template: '<div>Your dynamic component</div>',

   })

   export class YourDynamicComponent {

     constructor(private el: ElementRef, private renderer: Renderer2) {}


     findComponentBySelector(selector: string): Element | null {

       return this.el.nativeElement.querySelector(selector);

     }

   }

   ```


Please note that dynamically creating and manipulating components in Angular is a complex task and should be used with care. Ensure that the component you want to find is rendered in the view before attempting to query it. The approach might vary slightly depending on the specific requirements and structure of your application, so adapt the code to your needs as necessary. Also, be sure to check the documentation and updates for Angular 15 or the specific version you're using for any changes or new features.

Comments

Post a Comment

Popular posts from this blog

bad character U+002D '-' in my helm template

 In Helm templates, the hyphen character (`-`) can sometimes be treated as a reserved character, particularly when defining values or labels. To include a hyphen character in a Helm template without issues, you can use one of the following approaches: 1. **Quoting the Hyphen:**    You can enclose the hyphen in double quotes, like this:    ```yaml    key: "-"    ```    This way, Helm will interpret the hyphen as a string rather than an operator. 2. **Using Backticks:**    If you need to use the hyphen within a Go template function or inside backticks, you can escape it with a backslash (`\`), like this:    ```yaml    value: `{{ .Values.someField | printf "%s \\-" }}`    ```    The backslash prevents Helm from interpreting the hyphen as a special character. 3. **Variable Assignment:**    Assign the value to a variable and use it. For example:    ```yaml    {{- $hyphen := "-" }}    key: {{ $hyphen }}    ```    This way, you can use the variable `$hyphen` wher
Read more

GitLab pipeline stopped working with invalid yaml error

 When your GitLab pipeline has stopped working with an "invalid YAML" error, it means there's a problem with your `.gitlab-ci.yml` file. This could be due to syntax errors, incorrect indentation, or other issues in your pipeline configuration. Here's how to troubleshoot and resolve this issue: 1. **Check for Syntax Errors**:    Carefully review your `.gitlab-ci.yml` file for any syntax errors. Common issues include missing colons, indentation problems, or mismatched quotation marks. Use a YAML linter or an online YAML validator to identify and correct syntax errors. 2. **Indentation**:    YAML relies heavily on proper indentation. Make sure that all lines within the same block have consistent indentation (typically using spaces, not tabs). Incorrect indentation can cause YAML parsing errors. 3. **Dashes and Lists**:    Ensure that you use the correct syntax for lists (arrays) in YAML by starting each item with a dash (`-`). Be consistent with your use of dashes throug
Read more

How do I add a printer in OpenSUSE which is being shared by a CUPS print server?

 To add a printer in openSUSE that is being shared by a CUPS print server, you can use the following steps: 1. **Ensure CUPS Client is Installed:**    Make sure your openSUSE system has the CUPS client tools installed. You can install them using the following command:    ```bash    sudo zypper install cups-client    ``` 2. **Discover Available Printers:**    Use the `lpinfo` command to discover available printers on your CUPS print server. Replace `cups-server-hostname` with the hostname or IP address of your CUPS server:    ```bash    lpinfo -v -h cups-server-hostname:631    ```    This command should list the printers shared by the CUPS server. 3. **Add a Printer:**    Use the `lpadmin` command to add a printer. Replace `printer-name` with the name of the printer you want to add and `printer-uri` with the URI obtained from the `lpinfo` command:    ```bash    sudo lpadmin -p printer-name -E -v printer-uri    ```    For example:    ```bash    sudo lpadmin -p MyPrinter -E -v socket://cu
Read more