How to change/update a single line

[nmanumr]

i use editor.getValue to get the editor text, made some changes and then use editor.setValue to update the editor text but when file are too large this technique fails because the whole file is highlighted again.

so, i want to know is there any way to just current line and then update it.

[itskhurrams]

one way of doing is
for (var linenumber = 0; linenumber < editor.getModel()._lines.length; linenumber++)
{
editor.getModel()._lines[linenumber]._text = "some text";
}

[hediet]

An other way is to use editor.executeEdits:

editor.executeEdits("my-source", 
    [{ identifier: "my-ident", range: new monaco.Range(1, 1, 1, 1), text: "text" }]);

[nmanumr]

and how can i get current line

[itskhurrams]

you can get current line number via,
editor.getPosition().lineNumber

You can get the current line text via:
editor.getModel().getLineContent(editor.getPosition().lineNumber)

[alexdima]

To edit a model:

• if the model is attached to an editor and you want undo to work:
  • editor.executeEdits combined with editor.pushUndoStop as desired (before or after or both)
• if the model is not attached to an editor
  • model.pushEditOperations
• if you don't care about the undo stack:
  • model.applyEdits

I would really not recommend using editor.getModel()._lines[linenumber]._text. This will edit the text, but it will not send out correct events to the view, it will not update markers, and it will not update the tokenization state correctly. As a general rule, doing anything that implies accessing things with _ in their name should be avoided at all cost.