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Editorial Team
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Asked: 2026-05-19T13:34:00+00:00

In a Swing application I’m using a JTextPane with an HTMLDocument backend. At one

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In a Swing application I’m using a JTextPane with an HTMLDocument backend. At one point I’m inserting some sort of placeholders programmatically into the document with

document.insertString(…)

For some reason, using the

HTMLEditorKit.insertHTML()

method doesn’t make the text appear in the JTextPane.

What I’d like to know is what position I’m inserting to in the document, that is, the HTML document which is written in the background. I can say

JTextPane.getCaretPosition()

but this only gives me the offset in the document visible to the frontend, not the resulting one.

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1 Answer

  1. Editorial Team

    It has no sence because the result document’s html text can be different. E.g. end of line could be “\n” or “\r\n” depending on OS and JVM settings. HTML skips e.g. double spaces or spaces between tags. Two tags without space between them and with a line break between them has the same offset in the Document.
    You can add a custom tag with specific id and search the result document’s html text for the id.

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