dom-node

How can I change a JS element to see if it is a node or an empty variable? user113716 It depends on what you mean by an empty variable. If you mean it hasn't had a value assigned, you can check for undefined alert( someVariable !== "undefined" ); Or if you know it has a value, and need to see if it is an element, you could do something like this: alert( someVariable && someVariable.nodeType ); Or if you need to verify that it is a type 1 element, you could do this: alert( someVariable && someVariable.nodeType === Node.ELEMENT_NODE ); This eliminates text nodes, attribute nodes, comments, and a

how i can use .getElementsByTagName in DOMNodeList Object ? Like: procedure TForm1.selecionarClick(Sender: TObject); var DOMDocument: iXMLDOMDocument; DOMNodeList: iXMLDOMNodeList; DOMNode: iXMLDOMNode; DOMElement: iXMLDOMElement; i: Integer; begin Memo.Text := ''; with DOMDocument do begin DOMDocument := coDOMDocument.Create; DOMDocument.load( 'C:\Usuarios.xml' ); DOMDocument.preserveWhiteSpace := false; DOMNodeList := DOMDocument.selectNodes( './/usuario[@codigo="'+codigo.Text+'"]/' ); for i := 0 to DOMNodeList.length - 1 do begin end; end; end; My XML structure: <?xml version="1.0" encoding

I have 4 columns, none of whose height is fixed, and I need to find the height of these columns so that the height of the largest column can be set to the other three. How can I do this with React and not using the 'minHeight' css? I am a newbie in React and the closest question I found here was ReactJS get rendered component height . Also I found this link which says that this could be done by getting the DOMNode and using the Refs, but I'm with no success. You can just use the ref callback and access the DOMNode inside it. class Example extends React.Component { constructor(props) { super