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DOCS: Add YAML example for including extra JS in the CMS

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Loz Calver 2018-10-11 12:33:53 +01:00 committed by GitHub
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docs/en/02_Developer_Guides/15_Customising_the_Admin_Interface/How_Tos/CMS_Alternating_Button.md
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@ -136,8 +136,13 @@ extras.
Continuing our example let's add a "constructive" style to our *Clean-up* button. First you need to be able to add
custom JS code into the CMS. You can do this by adding a new source file, here
`app/javascript/CMSMain.CustomActionsExtension.js`, and requiring it
through a YAML configuration value: `LeftAndMain.extra_requirements_javascript`.
Set it to 'app/javascript/CMSMain.CustomActionsExtension.js'.
through a YAML configuration value:
```yml
SilverStripe\Admin\LeftAndMain:
extra_requirements_javascript:
- app/javascript/CMSMain.CustomActionsExtension.js
```
You can now add the styling in response to `afterrefreshalternate` event. Let's use entwine to avoid accidental memory
leaks. The only complex part here is how the entwine handle is constructed. `onbuttonafterrefreshalternate` can be