DOM - Atributo do objeto do nó - previousSibling

O atributo previousSibling especifica o nó imediatamente anterior ao nó atual.

Sintaxe

A seguir está a sintaxe para o uso do atributo previousSibling .

nodeObject.previousSibling

Exemplo

O conteúdo do node.xml é o seguinte -

<?xml version = "1.0"?>
<Company>
   <Employee category = "Technical">
      <FirstName>Tanmay</FirstName>
      <LastName>Patil</LastName>
      <ContactNo>1234567890</ContactNo>
      <Email>[email protected]</Email>
   </Employee>
   
   <Employee category = "Non-Technical">
      <FirstName>Taniya</FirstName>
      <LastName>Mishra</LastName>
      <ContactNo>1234667898</ContactNo>
      <Email>[email protected]</Email>
   </Employee>
   
   <Employee category = "Management">
      <FirstName>Tanisha</FirstName>
      <LastName>Sharma</LastName>
      <ContactNo>1234562350</ContactNo>
      <Email>[email protected]</Email>
   </Employee>
</Company>

O exemplo a seguir demonstra o uso do atributo previousSibling -

<!DOCTYPE html>
<html>
   <body>
      <script>
         if (window.XMLHttpRequest) {
            xmlhttp = new XMLHttpRequest();
         } else {
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
         }
         xmlhttp.open("GET","/dom/node.xml",false);
         xmlhttp.send();
         xmlDoc = xmlhttp.responseXML;

         function get_previousSibling(p) {
            a = p.previousSibling;
            while (a.nodeType != 1) {
               a = a.previousSibling;
            }
            return a;
         }

         x = get_previousSibling(xmlDoc.getElementsByTagName("Email")[0]);
         document.write("Previous sibling of Email is : ");
         document.write(x.nodeName);
      </script>
   </body>
</html>

Execução

Salve este arquivo como nodeattribute_previoussibling.htm no caminho do servidor (este arquivo e node.xml devem estar no mesmo caminho em seu servidor). Obteremos a saída conforme mostrado abaixo -

Previous sibling of Email is : ContactNo

↰ Previous page