Inserting a new text at given cursor position

Question

I am working on customizing the codemirror for my new language mode. As part of this new mode implementation, I am writing a new tool bar where user can select some text and

Answer 1

To add the new line at the end -

function updateCodeMirror(data){
    var cm = $('.CodeMirror')[0].CodeMirror;
    var doc = cm.getDoc();
    var cursor = doc.getCursor(); // gets the line number in the cursor position
    var line = doc.getLine(cursor.line); // get the line contents
    var pos = { // create a new object to avoid mutation of the original selection
        line: cursor.line,
        ch: line.length - 1 // set the character position to the end of the line
    }
    doc.replaceRange('\n'+data+'\n', pos); // adds a new line
}

Call function

updateCodeMirror("This is new line");