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setStartBefore

Figure 10-2

Several methods help you get more specific with selections while still setting these properties for you.

These are the following:

setStartBefore(

refNode

)

— Sets the starting point of the range to begin before

refNode

(so

refNode

is the first node in the selection). The

startContainer

property is set to

refNode

’s

parent and the

startOffset

property is set to the index of

refNode

within its parent’s

childNodes

collection.

setStartAfter(

refNode

)

— Sets the starting point of the range to begin after

refNode

(so

refNode

is not part of the selection; rather, its next sibling is the first node in the selection). The

startContainer

property is set to

refNode

’s parent and the

startOffset

property is set to

the index of

refNode

within its parent’s

childNodes

collection plus one.

setEndBefore(

refNode

)

— Sets the ending point of the range to begin before

refNode

(so

refNode

is not part of the selection; its previous sibling is the last node in the selection). The

endContainer

property is set to

refNode

’s parent and the

endOffset

property is set to the

index of

refNode

within its parent’s

childNodes

collection.

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Advanced DOM Techniques

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