I am trying to inject HTML into a Custom List schema. Essentially I am injecting a button that would go next to every document in a document library.
Is this possible to do without having to build a completely seperate page and control to surface the data? I'm thinking perhaps something in the custom list template schema or some type of JS injection. I'm using SP 2010.
You might want to look into custom fields.
MSDN: Creating Custom SharePoint 2010 Field Types
Avinash blog/guide on how to create your own custom field
It may not be the right way, but it will push you more towards using SharePoints API to its full potential.
Not sure if this will help, but have you thought about Calculated Columns? I have come across this blog and there are lots of examples how to insert HTML/CSS into list using a Calculated Column (I am using this technique for displaying images in list columns).
I think JS should work too but I've never tried, give this a shot maybe it will help. http://blog.pathtosharepoint.com/2008/09/01/using-calculated-columns-to-write-html/#comment-9825
What about a custom action in the Edit Control Block for each item, you can point this at a URL and pass the ID of the list item on the query string.
As @Tudor mentions; it's possible to use a calculated column to output HTML to the page. An alternative to Christophe's solution would be to use Pentalogic's (the company I work for) free HTML Calculated Column.
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