How to Integrate External JavaScript Scripts and Invoke Functions in Angular?

Incorporating External JavaScript Scripts and Function Invocation in Angular

Problem:

You possess a JavaScript file, titled "abc.js," housing a function named "xyz()." Your objective is to access and invoke this function within your Angular project. How can you achieve this?

Solution:

1. Reference Scripts in Angular Configuration File:

Locate and open the "angular-cli.json" file (or "angular.json" for Angular versions 6 and above). Under the "scripts" property, specify the path to your external JavaScript file, as seen in this example:

<code class="json">"scripts": [
    "../path" 
 ]</code>

2. Declare Variable in typings.d.ts:

Create a file named "typings.d.ts" in the "src" directory if it doesn't exist. Within this file, declare a variable that will reference your external script:

<code class="typescript">declare var variableName:any;</code>

3. Import into Angular Component:

In your Angular component, import the variable you declared in "typings.d.ts" using the following syntax:

<code class="typescript">import * as variable from 'variableName';</code>

Now, you can access the function "xyz()" from your Angular project by calling "variable.xyz()".

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