// RemoveChildren removes all of the child nodes of the node given
func RemoveChildren(node dom.Node) dom.Node {
n := node.Underlying()
for n.Call("hasChildNodes").Bool() {
n.Call("removeChild", n.Get("lastChild"))
}
return node
}
// SetInnerText removes all child nodes from the given node and sets a single
// Text Node with the given string
func SetInnerText(node dom.Node, text string) dom.Node {
n := node.Underlying()
for n.Call("hasChildNodes").Bool() {
n.Call("removeChild", n.Get("lastChild"))
}
n.Call("appendChild", js.Global.Get("document").Call("createTextNode", text))
return node
}
// SetPreText does similar to SetInnerText, but linebreaks are converted to <br />s
func SetPreText(node dom.Node, text string) dom.Node {
n := node.Underlying()
for n.Call("hasChildNodes").Bool() {
n.Call("removeChild", n.Get("lastChild"))
}
for i, part := range strings.Split(text, "\n") {
if i > 0 {
n.Call("appendChild", js.Global.Get("document").Call("createElement", "br"))
}
n.Call("appendChild", js.Global.Get("document").Call("createTextNode", part))
}
return node
}
// GetShadowRoot retrieves the shadowRoot connected to the pass dom.Node, else
// returns false as the second argument if the node has no shadowRoot.
func GetShadowRoot(elem dom.Node) (dom.DocumentFragment, bool) {
if elem == nil {
return nil, false
}
var root *js.Object
if root = elem.Underlying().Get("shadowRoot"); root == nil {
if root = elem.Underlying().Get("root"); root == nil {
return nil, false
}
}
return dom.WrapDocumentFragment(root), true
}
// Observe registers a DOM Node to receive events for
func (m *Observer) Observe(n dom.Node, i ObserverInit) {
j := js.Global.Get("Object").Get("constructor").New()
j.Set("childList", i.ChildList)
j.Set("attributes", i.Attributes)
j.Set("characterData", i.CharacterData)
j.Set("subtree", i.Subtree)
j.Set("attributeOldValue", i.AttributeOldValue)
j.Set("characterDataOldValue", i.CharacterDataOldValue)
if i.Attributes {
a := js.Get("Array").New(len(i.AttributeFilter))
for i, f := range i.AttributeFilter {
a.SetIndex(i, f)
}
j.Set("attributeFilter", a)
}
m.Call("observe", n.Underlying(), j)
}