how expand/move range object

[Thomas]

Hi dudes,

I have a range object for text (not the one in the IE, the one for
Mozilla). Now I have a function to reduce/move the range in the text
to the LEFT, e.g.:
range.setStart(range.startContainer, startPos-1);
range.setEnd(range.endContainer, endPos-1);
range ist the range object created via
window.getSelection.getRangeAt(0).
Now I have the problem to extend or simply move the range to the
RIGHT.
range.setEnd(range.endContainer, endPos + 1);
range.setStart(range.startContainer, startPos + 1);
I thought I could simply switch the sign, but this doesn't work, I get
the following error (yes, I exchanged the order for expanding, so that
first the endContainer is moved and afterwards the startContainer ;-)
):

Error: [Exception... "Index or size is negative or greater than the
allowed amount" code: "1" nsresult: "0x80530001
(NS_ERROR_DOM_INDEX_SIZE_ERR)" location: "xxx.html Line: 79"]
Source File: xxx.html
Line: 79

Thx for any help,
Thomas

 

[Martin Honnen]

I have a range object for text (not the one in the IE, the one for
Mozilla). Now I have a function to reduce/move the range in the text
to the LEFT, e.g.:
range.setStart(range.startContainer, startPos-1);
range.setEnd(range.endContainer, endPos-1);
range ist the range object created via
window.getSelection.getRangeAt(0).
Now I have the problem to extend or simply move the range to the
RIGHT.
range.setEnd(range.endContainer, endPos + 1);
range.setStart(range.startContainer, startPos + 1);
I thought I could simply switch the sign, but this doesn't work, I get
the following error (yes, I exchanged the order for expanding, so that
first the endContainer is moved and afterwards the startContainer ;-)
):

Error: [Exception... "Index or size is negative or greater than the
allowed amount" code: "1" nsresult: "0x80530001
(NS_ERROR_DOM_INDEX_SIZE_ERR)" location: "xxx.html Line: 79"]
Source File: xxx.html
Line: 79

That will probably depend on what kind of node the current end or
startContainer is and whether there is anything left to move to. If
needed you must change the container.