Script tag in Aurelia view is not executed

Question

I'm adding a simple script block to a simple aurelia view:

<template>
    <script type="text/javascript">
    alert('Hello!');
    </script>
</template>

The script is never run, even though the view is rendered correctly and I can see that the script block does appear in the DOM.

I have also tried dynamically inserting a script block via the viewModel and also tried with:

 <script type="text/javascript" src="http://blah"></script>

I understand it's not best practice to do this, but I'm trying to integrate a third party widget that will then render an iframe. The alert shown above is just a simple way of the verifying the issue that I'm seeing.

The real life scenario is as follows:

• I make an api call to a third party from my view model.

• The following is returned:

  <script type='text/javascript' language='JavaScript' src='https://secure.na1.echosign.com/public/embeddedWidget? ` wid=CBFCIBAA3AAABLblqZhBU33GaMRZ2lMelHKzti7RkanxMP5v- uW_f8CEiKoopNNofJWyXhmE56Su3HTbY*&token=CBNCKBAAHBCAABAARNiZ7Yba0h7dnLaQRBAdTdH9UrJZKryP' />

I need to append this to the DOM and have it execute. I am working around this issue by calling the above url via fetch and then I exec the response, but it seems like a tedious/hacky way of doing it.

Answer 1

I would recommend adapting the solution provided in this answer: Use JS variable to set the src attribute for <script> tag.

In your VM's bind or attached method (most likely):

let scriptURL = api.getURL();

let scriptElement = document.createElement('script');

scriptElement.src = scriptURL;
scriptElement.onload = () => {
    // do anything you need to do here, or call a VM method
    this.someVMMethod();
};

this.scriptElementInHead = document.querySelector('head').appendChild(scriptElement);

If need be, you can even remove the script element by keeping a reference to it and removing it from the head element when the component is being unloaded in the unbind or detached methods.

 detached() {
   document.querySelector('head').removeChild(this.scriptElementInHead);
 }