Uncaught TypeError: Failed to execute 'getComputedStyle' on 'Window': parameter 1 is not of type 'Element'.

[north-krimsly-hp]

Greetings Swagger-UI team,

We're using version 3.9.3 integrated with Drupal 7. When I load a page with Swagger-UI rendered OpenAPI spec on it, I get the Javascript console error "Uncaught TypeError: Failed to execute 'getComputedStyle' on 'Window': parameter 1 is not of type 'Element'." in swagger-ui-bundle.js line 98 and "Uncaught ReferenceError: SwaggerUIBundle is not defined". These errors are encountered whether the OpenAPI spec files we are attempting to render are version 2 or version 3. These errors show up on both Chrome and Safari on OS X 10.13.3. Our site also uses jQuery 1.12.

The code we wrote to render an OpenAPI spec using Swagger-UI in a Drupal page was working using version 3.6.1 of the Swagger-UI library. We did the integration by dropping in swagger-ui.js, swagger-ui-bundle.js and swagger-ui-standalone-preset.js from the dist folder. We did not copy over the .map files. We used the following code to render a Swagger-ui instance. Do you know why the code below worked in 3.6.1 but is failing in 3.9.3? I've tried many different approaches but can't figure out why it isn't working anymore.

Thanks

`<script>$(document).ready(function() {
const swagger_ui_139 = SwaggerUIBundle({
url: 'path-to-swagger-file/swagger-file.json',
dom_id: '#swagger-ui-container-139',
validatorUrl: null,
docExpansion: 'none',
supportedSubmitMethods: '[]',
presets: [
SwaggerUIBundle.presets.apis,
SwaggerUIStandalonePreset
],
plugins: [
SwaggerUIBundle.plugins.DownloadUrl
],
layout: 'StandaloneLayout',
});});</script>

<script>`

[shockey]

Hey @north-krimsly-hp!

Take a look at #4038, your issue may have the same root cause. I mentioned some workarounds, so give them a spin and let me know what happens!

[north-krimsly-hp]

Hi Shockey,

Hey that workaround worked! I modified the page so that the swagger-ui Javascript files load in the footer instead of the document head. I also set the defer="defer" attribute on those scripts, and finally I made an additional script that fires before the swagger-ui scripts load, that sets window.noZensmooth = true.

Thanks very much, I'm not sure I ever would have figured it out. I hope the Zenscroll team fixes the problem though, it was very difficult to trouble-shoot.

[shockey]

Glad you got it working! Yeah, it was a tough thing to track down - it took @ponelat and I most of a morning to even identify 😄

[shockey]

Hi folks - Zenscroll has released zenscroll@4.0.1 which fixes this issue on their end.

Future versions of Swagger-UI will capture this fix as well.

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