How to get the caret position (cursor position) of a iframe which has designMode ‘on’ in firefox

Took me a couple of hours to find this out. Couldn’t find it on the internet. With a little bit of improvising finally found out the way.

var range = document.getElementById('iframe_id').contentWindow.getSelection().getRangeAt(0);

thats it.


Since this is an iframe we are talking about you should know the startOffset and endOffset is wrt to the container of the start pos and end pos text. In here what I meant by the container is that iframe may contain html tags.

For eg: name is <b>saminda</b>. I like js.....

if you had selected the text “is samin” from the iframe the endOffset would be 5, not startOffset+3+5. Hope you understood


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10 Responses to “How to get the caret position (cursor position) of a iframe which has designMode ‘on’ in firefox”

  1. Mohammad Khatib Says:

    Thanks for this information.
    I am finding a hard time SETTING the caret position in the a designMode enabled iframe, do you know away of doing so?


  2. samindaw Says:

    this is for firefox, i daresay for other browsers this can differ.


    //we are saving the current selected range obj

    //and we need to create a new range object to set the caret position to 5
    var range = document.createRange();



    //remove the old range and add the newly created range


    note the sel.anchorNode and sel.focusNode properties. If you understand the contents that in an iframe in designmode is also just bunch of xml tags (xml nodes), it is exactly what the properties mean. the selectionstart can be in one node while the selection end can be in another node. in the above sample i’m just putting both of them in the same node. Try debugging and see the values in the object “sel”. u’ll understand.


  3. Mohammad Khatib Says:

    Wow, this is awesome, this is exactly what I needed.
    Thank you very much

  4. Jon Says:

    Have you noticed that the caret will span multiple lines for FF if the focus is set programatically? If you click on the RTE then all is fine, but if there is a block of text (within a div, p, etc) and focus is called on it, I end up with a very tall blinking cursor. Very strange.



  5. iFrame in desingMode="on", cursor positioning - JavaScript / Ajax / DHTML answers Says:

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