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Element node understanding in the DOM

Source: Internet
Author: User
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Node information

Each node has properties that contain some information about the node. These properties are:

    • NodeName (node name)
    • NodeValue (node value)
    • NodeType (node type)
NodeType

The NodeType property returns the type of the node.

The most important node types are:

element Type node Type
Elements 1
Property 2
Text 3
Comments 8
Document 9

in the actual application, is often used is the element node, attribute node and text node, below we through the small section code to explain

1: Element node

ELEMENT Node code
  2. <HEAD>
  4. <TITLE> Empty Valley leisurely </TITLE>
  6. </HEAD>
  8. <BODY>
  10. <table>
  12. <tr>
  14. <TD id= "John" name= "MyName" >John</td>
  16. <td>Doe</td>
  18. <TD id= "Jack" >Jack</td>
  20. </tr>
  22. </table>
  24. <script>
  26. var d = document.getElementById ("John");
  28. alert (d.nodetype)
  30. alert (d.nodename)
  32. alert (d.nodevalue)
  34. </script>
  36. </BODY>
  38. </HTML>
<HEAD>  <TITLE> Empty Valley leisurely </TITLE> </HEAD> <BODY>  <table><tr><td id= "John" Name= "myname" >john</td><td>doe</td><td id= "Jack" >Jack</td></tr>  </table>  <script> var d = document.getElementById ("John"), alert (d.nodetype) alert (d.nodename) Alert (d.nodevalue)  </script> </BODY></HTML>

Analyze the result of the run with the values of the three properties:

Nodetype:element_node

NodeType Value: 1

NodeName: Element tag name//here is TD

Nodevalue:null

2: Attribute node

Attribute Node code
  2. <HEAD>
  4. <TITLE> Empty Valley leisurely </TITLE>
  6. </HEAD>
  8. <BODY>
  10. <table>
  12. <tr>
  14. <TD id= "John" name= "MyName" >John</td>
  16. <td>Doe</td>
  18. <TD id= "Jack" >Jack</td>
  20. </tr>
  22. </table>
  24.   
  26. <script>
  28. var d = document.getElementById ("John"). GetAttributeNode ("name");
  30. alert (d.nodetype)
  32. alert (d.nodename)
  34. alert (d.nodevalue)
  36. </script>
  38. </BODY>
  40. </HTML>
<HEAD>  <TITLE> Empty Valley leisurely </TITLE> </HEAD> <BODY>  <table><tr><td id= "John" Name= "myname" >john</td><td>doe</td><td id= "Jack" >Jack</td></tr>  </table>  <script> var d = document.getElementById ("John"). GetAttributeNode ("name"); Alert ( D.nodetype) alert (d.nodename) alert (d.nodevalue)  </script> </BODY></HTML>

Analyze the result of the run with the values of the three properties:

Nodetype:attribute_node

NodeType Value: 2

NodeName: Attribute name//name

NodeValue: Attribute value//myname

3: Text node

Text Node code
  2. <HEAD>
  4. <TITLE> New Document </TITLE>
  6. </HEAD>
  8. <BODY>
  10. <table>
  12. <tr>
  14. <TD id= "John" name= "MyName" >John</td>
  16. <td>Doe</td>
  18. <TD id= "Jack" >Jack</td>
  20. </tr>
  22. </table>
  24. <script>
  26. var d = document.getelementsbytagname ("TD") [0].firstchild
  28. alert (d.nodetype)
  30. alert (d.nodename)
  32. alert (d.nodevalue)
  34. </script>
  36. </BODY>
  38. </HTML>
<HEAD>  <TITLE> New Document </TITLE> </HEAD> <BODY>  <table><tr> <TD id= "John" Name= "myname" >john</td><td>doe</td><td id= "Jack" >jack</td></ tr>  </table>  <script>    var d = document.getelementsbytagname ("TD") [0].firstchildalert ( D.nodetype) alert (d.nodename) alert (d.nodevalue)  </script> </BODY></HTML>

Analyze the result of the run with the values of the three properties:

Nodetype:text_node

NodeType Value: 3

NodeName: #text

NodeValue: Text content//John

Element node understanding in the DOM

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Related Keywords:
dom node node element node element node dom element methods org w3c dom element dom delete element html dom element

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