Loading an Angular2 app is made possible by ensuring that it is only initiated when a DOM element is detected

In my main.ts file, the code below is functioning perfectly:

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';

platformBrowserDynamic().bootstrapModule(AppModule);

However, I want to make sure that the app is only bootstrapped when the main selector is present. To achieve this, I tried the following approach:

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';

document.addEventListener('DOMContentLoaded', function() {
  var shouldBootstrap = document.getElementById("my-app-selector");
  if (shouldBootstrap) {
    platformBrowserDynamic().bootstrapModule(AppModule);
  }
});

Unfortunately, this solution is not working, possibly due to the mix of JavaScript and TypeScript in this scenario. Is there a method to detect an event and check for the existence of a DOM element to prevent unnecessary Angular2 bootstrapping?

I am considering this approach because I serve the bundled JavaScript with webpack.

Thank you!

Answer №1

When working with selectors, it's helpful to use

console.log(document.getElementById("my-app-selector"))
to check what is returned - whether the selector is present or not. Based on this information, you can create your if statement accordingly:

if (document.getElementById("my-app-selector") !== undefined){
  platformBrowserDynamic().bootstrapModule(AppModule);
}

Alternatively, consider using let instead of var in typescript:

let shouldBootstrap = document.getElementById("my-app-selector");

Answer №2

If you're using webpack, simply include your bundle file after the selector tag.

Error: my-app selector couldn't be found

 <body>
 <script src="../dist/app.bundle.js"></script>
 <my-app>Loading...</my-app>
 </body>

It should work like this

 <body>
 <my-app>Loading...</my-app>
 <script src="../dist/app.bundle.js"></script>
 </body>

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Javascript promise failing to deliver

As a beginner in the world of JavaScript development, I am excited to be part of the stackoverflow community and have already gained valuable insights from reading various posts. Currently, I am facing an issue where I need to load a file, but due to its ...

What is the best way to retrieve the object of the selected option from a single select input in Angular

I'm currently working with an array of objects that looks like this: let myArray = [{'id':1,'Name':"ABC"},{'id':2,'Name':"XYZ"}] I'm trying to retrieve object values based on a dropdown selection, but so ...

The Jhipster drag-and-drop module, also known as ng-d

Just diving into the world of AngularJS and I decided to play around with the Jhipster framework. My goal is to create an angular module that enables drag and drop functionality for components. However, my code seems to be failing right from the initializ ...

Implementing Dual Submit Buttons in Node.js using Express Framework

Struggling with implementing a like and dislike function in my node js app. Currently, I can only do one at a time. Below is the HTML code snippet: <form method="post" name="ratings"> <input type="submit" name="vote" value="like"> < ...

Verify the legitimacy of the object

I'm encountering an issue while attempting to create a function that verifies the validity of an object. const isPeriodValid = (period: Period | null): boolean => { return period && period.start && period.end; } export interfac ...

Customize Text Area's Font Based on Selected Option in Dropdown List

I'm currently working on an HTML file that includes a dropdown list and a text area. Here's the code snippet: <select id='ddlViewBy' name='ddlViewBy' onchange='applyfonttotextarea()'> <option value = ' ...

Exploring Angular 17 with the Nebular framework through the implementation of Standalone Components

Exploring Angular in combination with Nebular for UI has been my recent focus. To get started, I decided to create a quick app and dive into the intricacies of these frameworks. After setting up Angular, I initialized a new app using app new my-app. I en ...

Issue with debugging capabilities in Javascript on VSCode has been detected

UPDATE: I'm seeking guidance on configuring VSCode for debugging Javascript. While I'm familiar with JavaScript functioning in a browser, I find it tedious to rely solely on console.log(). I am looking to debug and step through my code effectivel ...

Electron Web Workers do not have compatibility with NodeJS modules

I'm currently working on a desktop application using Electron paired with ReactJS. From the initial renderer process, I create a hidden BrowserWindow to launch another renderer process. Within this new renderer process, I set up a web worker that wil ...

Display a div every 3 seconds with the help of jQuery

I am seeking a solution to display the second div (box2) every 3 seconds. Can anyone help me achieve this using jQuery? <div id="box1" style="background-color:#0000FF"> <h3>This is a heading in a div element</h3> <p>This ...

Using ng-bootstrap with Bootstrap 4 beta as an npm dependency

After updating my npm dependencies in package.json to Bootstrap 4 beta and ng-bootstrap to 1.0.0-beta.5, I encountered an "UNMET PEER DEPENDENCY" for popper.js when running npm install due to its new addition as a dependency in Bootstrap 4 beta. Despite th ...

Issue with Material UI select component not displaying the label text

I've been struggling with Material UI's "Select" for quite some time now - spent about 10 hours trying to make it work the way I want. Any help would be greatly appreciated. This question is connected to a previous one: Select MenuItem doesn' ...

What is the process of integrating data from the OpenWeatherMap API into the WindowInfo feature of Google Maps?

My current project involves retrieving weather information from the openweathermap API and displaying it in an infowindow on Google Maps. However, there seems to be an issue where I am getting data from the previous marker instead of the current one. var ...

Why won't my boolean value in the Angular service reflect in the HTML code?

For my project, I am utilizing a stepper and I need to display or hide a div based on the selected product. However, I am encountering an issue where the HTML isn't updating when I try to call the done() function. .service public beneficiary = true; ...

How can we manage a discovered item in Promise and Recursion scenarios without relying on a callback function?

I need to iterate asynchronously and recursively over a folder hierarchy on the server. When a file is found, I want to call a custom method. Here's my current code structure: searchFile(root, handleFile); // recursively loop through folders and ha ...

"Tips for removing all child elements from a parent element using Angular's Renderer2 in versions 5 and above

Manipulating the DOM programmatically is recommended using Angular's Renderer2. Within my directive, I extract some text from el.nativeElement.innerText, modify it, and aim to append it to my element: const text = renderer.createText(`${el.innerTex ...

Is it possible to create a webpage where the header and footer remain static, while the content in the body can be dynamically changed

I am in the process of creating a webpage where main.html will load a page with a static header and footer that remains unchanged when navigation links are clicked. I'd like to achieve this using Javascript, with the body content being sourced from an ...

When using angular's ngHide directive on a button, it will still occupy space in the

At the bottom of this HTML file, there are 3 buttons displayed. The first image illustrates the layout of the 3 buttons. The second image demonstrates what happens when the middle button in the footer is commented out. The third image shows the situat ...

Utilizing JavaScript to retrieve data from a self-submitting form

From my database, I am able to create a list of options for users to choose from. Once a selection is made, the values are submitted back to the same page and retrieved using Javascript. Within the same form, there are radio buttons and a multiple selecti ...

Close the $uibModal from the inside

Utilizing Bootstrap's $uibModal to create forms for my web application has been a smooth process, except for one issue - the inability to close the dialog once it has been displayed. I hesitated to post such a basic question here after spending two d ...