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insertBefore(newChild [, refChild] )
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Parameters
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ComponentnewChild
The component to insert.
ComponentrefChild
[optional] The reference component. That is, the component before which the new component must be inserted.
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Returns
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Component. The component being inserted.
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Throws
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WindowException
HIERARCHY_REQUEST_ERR: Raised if the component is of a type that does not allow children of the type of the newChild component, or if the component to insert is one of this component's ancestors.
WRONG_WINDOW_ERR: Raised if newChild was created from a different window than the one that created this component.
NOT_FOUND_ERR: Raised if refChild is not a child of this component.
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