Utilizing an Angular framework to access external JavaScript libraries when the document is fully

Question

Utilizing an Angular framework to access external JavaScript libraries when the document is fully

I'm incorporating a third-party JavaScript library into my .NET Core ASP Angular application. This library executes its functionality within the $(document).ready method. However, I've encountered an issue where the library's logic isn't being applied correctly when navigating to an Angular route because the $(document).ready method isn't triggering.

To address this problem, I have included the external JavaScript library in the scripts section of my angular-cli configuration.

In an attempt to resolve the issue, I edited the third-party JavaScript file and added a method that calls the same logic as the one triggered in the document ready event. Now, I'm facing difficulty figuring out how to invoke this method from my Angular TypeScript component.

To simplify and test the solution, I created a basic JavaScript file named Tester.js, which is listed in my -angular-cli.json under the scripts tag:

(function ($) {
    "use strict";

    $(document).ready(function () {        
        CallMe();
    });

    function CallMe(){
         console.log('HEY I GOT CALLED');
    }

 })(jQuery);

My goal is to trigger the CallMe() method from within a TypeScript component file. While the CallMe() method successfully fires once on the document.ready event, I am struggling to find a way to execute it dynamically from my TypeScript scripts.

Do you have any suggestions or ideas on how to achieve this?

javascript jquery angular typescript

Answer 1

Answer №1

Step 1

Firstly, check the availability of the external library on npm. If it is available there, you can import the desired function instead of making changes to a vendored file.

For instance, it might offer an API like this:
YourTsComponent.ts

const CallMe = require('library').CallMe
// or
import { CallMe } from 'library'

// trigger on route change
CallMe()

If such an option exists, great! If not...

Step 2

Validate your assumption by creating a global variable (attaching CallMe temporarily to window). If your assumption is correct, calling this global variable on route change should produce the desired outcome.

Tester.js

(function($) {
  "use strict";

  $(document).ready(function() {
    CallMe();
  });

  function CallMe() {
    console.log('HEY I GOT CALLED');
  }

  // TODO - remove (testing purpose)
  window._CallMe = CallMe
})(jQuery);

YourTsComponent.ts

// trigger on route change
window._CallMe()

If that doesn't yield results, it's time to reassess your assumption.

However, if it does ...

Step 3

Transform the vendored library into a module that your app can utilize. The process may vary depending on the type of module system you are using. For instance, with require.js:

Tester.js

(function(factory) {
  if (typeof define === 'function' && define.amd) {
    // AMD
    define(['jquery'], factory);
  } else if (typeof exports === 'object') {
    // CommonJS
    factory(require('jquery'));
  } else {
    // Browser globals
    factory(jQuery);
  }
}(function($) {
  "use strict";

  function CallMe() {
    console.log('HEY I GOT CALLED');
  }

  $(document).ready(function() {
    CallMe();
  });

  return CallMe
}));

YourTsComponent.ts

const CallMe = require('/path/to/tester.js')

// trigger on route change
CallMe()

If rewriting a vendored library is not preferable

You could explore overriding the default behavior of .ready so it can be re-executed. There are various answers available here for this approach, but remember, altering jQuery's default behavior carries more risk than modifying a single vendored file.

Answer 2

Step 1

Firstly, check the availability of the external library on npm. If it is available there, you can import the desired function instead of making changes to a vendored file.

For instance, it might offer an API like this:
YourTsComponent.ts

const CallMe = require('library').CallMe
// or
import { CallMe } from 'library'

// trigger on route change
CallMe()

If such an option exists, great! If not...

Step 2

Validate your assumption by creating a global variable (attaching CallMe temporarily to window). If your assumption is correct, calling this global variable on route change should produce the desired outcome.

Tester.js

(function($) {
  "use strict";

  $(document).ready(function() {
    CallMe();
  });

  function CallMe() {
    console.log('HEY I GOT CALLED');
  }

  // TODO - remove (testing purpose)
  window._CallMe = CallMe
})(jQuery);

YourTsComponent.ts

// trigger on route change
window._CallMe()

If that doesn't yield results, it's time to reassess your assumption.

However, if it does ...

Step 3

Transform the vendored library into a module that your app can utilize. The process may vary depending on the type of module system you are using. For instance, with require.js:

Tester.js

(function(factory) {
  if (typeof define === 'function' && define.amd) {
    // AMD
    define(['jquery'], factory);
  } else if (typeof exports === 'object') {
    // CommonJS
    factory(require('jquery'));
  } else {
    // Browser globals
    factory(jQuery);
  }
}(function($) {
  "use strict";

  function CallMe() {
    console.log('HEY I GOT CALLED');
  }

  $(document).ready(function() {
    CallMe();
  });

  return CallMe
}));

YourTsComponent.ts

const CallMe = require('/path/to/tester.js')

// trigger on route change
CallMe()

If rewriting a vendored library is not preferable

You could explore overriding the default behavior of .ready so it can be re-executed. There are various answers available here for this approach, but remember, altering jQuery's default behavior carries more risk than modifying a single vendored file.

Utilizing an Angular framework to access external JavaScript libraries when the document is fully

Answer №1

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