/// <summary>Removes the option at the given index.</summary>
public void remove(int index)
{
// Get it at that index:
HtmlOptionElement option = item(index);
if (option != null)
{
// Remove it:
option.remove();
}
}
/// <summary>Sets the option at the given index as the selected one.</summary>
/// <param name="index">The index of the option to select.</param>
public void SetSelected(int index)
{
bool runOnChange = true;
if (index == -3)
{
// Setup/ auto selected when the tag has just been parsed.
runOnChange = false;
index = 0;
}
// Get and set:
HtmlOptionElement element = GetOption(index);
SetSelected(index, element, runOnChange);
}
/// <summary>Searches parent (which must be a parent) for the given node.
/// Each time an option element is encountered, currentIndex is increased.</summary>
private HtmlOptionElement GetOption(Node parent, ref int targetIndex)
{
if (parent.childNodes_ == null)
{
return(null);
}
// For each child node..
for (int i = 0; i < parent.childNodes_.length; i++)
{
// Get it:
Node child = parent.childNodes_[i];
// Might be an optgroup containing it. Check if it is:
if (child is HtmlOptionElement)
{
// Is it the one we're after?
if (targetIndex <= 0)
{
// Yes!
return(child as HtmlOptionElement);
}
// Just decrease index:
targetIndex--;
continue;
}
if (child.childNodes_ != null)
{
// Go recursive:
HtmlOptionElement inChild = GetOption(child, ref targetIndex);
if (inChild != null)
{
return(inChild);
}
}
}
// Not found here.
return(null);
}
/// <summary>Sets the option at the given index as the selected one.</summary>
/// <param name="index">The index of the option to select.</param>
/// <param name="element">The element at the given index.</param>
/// <param name="runOnChange">True if the onchange event should run.</param>
private void SetSelected(int index, HtmlOptionElement element, bool runOnChange)
{
if (element == SelectedNode_)
{
return;
}
Dom.Event e = new Dom.Event("change");
e.SetTrusted(false);
// Cache previous:
int prevIndex = SelectedIndex_;
HtmlOptionElement prevNode = SelectedNode_;
// Update current (so onchange gets the correct value):
SelectedNode_ = element;
SelectedIndex_ = index;
if (runOnChange)
{
if (!dispatchEvent(e))
{
// Restore to previous:
SelectedIndex_ = prevIndex;
SelectedNode_ = prevNode;
return;
}
}
// Update placeholder:
if (SelectedNode_ == null)
{
// Clear the option text:
Placeholder.innerHTML = "";
index = -1;
}
else
{
Placeholder.innerHTML = SelectedNode_.innerHTML;
}
}
/// <summary>Sets the given element as the selected option.</summary>
/// <param name="element">The option to set as the selected value.</param>
public void SetSelected(HtmlOptionElement element)
{
SetSelected(-2, element, true);
}