Qt Toolkit - QDomElement Class

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# QDomElement Class Reference
[ XML module ]

The QDomElement class represents one element in the DOM tree. More...

`#include <qdom.h>`

Inherits QDomNode.

List of all member functions.

## Public Members

- QDomElement ()
- QDomElement ( const QDomElement & x )
- QDomElement& operator= ( const QDomElement & )
- ~QDomElement ()
- void setTagName ( const QString & name )
- QString tagName () const
- QString attribute ( const QString & name, const QString & defValue = QString::null ) const
- void setAttribute ( const QString & name, const QString & value )
- void setAttribute ( const QString & name, int value )
- void setAttribute ( const QString & name, uint value )
- void setAttribute ( const QString & name, double value )
- void removeAttribute ( const QString & name )
- QDomAttr attributeNode ( const QString & name )
- QDomAttr setAttributeNode ( const QDomAttr & newAttr )
- QDomAttr removeAttributeNode ( const QDomAttr & oldAttr )
- bool hasAttribute ( const QString & name ) const
- virtual QDomNodeList elementsByTagName ( const QString & tagname ) const
- void normalize ()
- virtual QDomNamedNodeMap attributes () const
- virtual QDomNode::NodeType nodeType () const
- virtual bool isElement () const
- QString text () const

## Detailed Description

The QDomElement class represents one element in the DOM tree.

Elements have a name() and zero or more attributes associated with them.

Attributes of the element are represented by QDomAttr objects, that can be queried using the attribute() and attributeNode() functions. You can set attributes with the setAttribute() and setAttributeNode() functions.

For further information about the Document Objct Model see http://www.w3.org/TR/REC-DOM-Level-1/. For a more general introduction of the DOM implementation see the QDomDocument documentation.

## Member Function Documentation

### QDomElement::QDomElement ()

Constructs an empty element. Use the QDomDocument::createElement() function to construct elements with content.

### QDomElement::QDomElement ( const QDomElement & x )

Copy constructor.

The data of the copy is shared: modifying one will also change the other. If you want to make a real copy, use cloneNode() instead.

### QDomElement::~QDomElement ()

Destructor.

### QString QDomElement::attribute ( const QString & name, const QString & defValue = QString::null ) const

Returns the attribute with the name name. If the attribute does not exist defValue is returned.

See also setAttribute(), attributeNode() and setAttributeNode().

### QDomAttr QDomElement::attributeNode ( const QString & name )

Returns the QDomAttr object that corresponds to the attribute with the name name. If no such attribute exists a null object is returned.

See also setAttributeNode(), attribute() and setAttribute().

### QDomNamedNodeMap QDomElement::attributes () const `[virtual]`

Returns a QDomNamedNodeMap containing all attributes for this element.

See also attribute(), setAttribute(), attributeNode() and setAttributeNode().

Reimplemented from QDomNode.

### QDomNodeList QDomElement::elementsByTagName ( const QString & tagname ) const `[virtual]`

Returns a QDomNodeList containing all descendant elements of this element with the name tagname. The order they are in the node list, is the order they are encountered in a preorder traversal of the element tree.

### bool QDomElement::hasAttribute ( const QString & name ) const

Returns TRUE is this element has an attribute with the name name, otherwise FALSE.

### bool QDomElement::isElement () const `[virtual]`

Returns TRUE.

Reimplemented from QDomNode.

### QDomNode::NodeType QDomElement::nodeType() const `[virtual]`

Returns `ElementNode.`

Reimplemented from QDomNode.

### void QDomElement::normalize ()

Calling normalize() on an element brings all its children into a standard form. This means, that adjacent QDomText objects will be merged to one text object (QDomCDATASection nodes are not merged).

### QDomElement& QDomElement::operator= ( const QDomElement & x )

Assignment operator.

The data of the copy is shared: modifying one will also change the other. If you want to make a real copy, use cloneNode() instead.

### void QDomElement::removeAttribute ( const QString & name )

Removes the attribute with the name name from this element.

See also setAttribute() and attribute().

### QDomAttr QDomElement::removeAttributeNode ( const QDomAttr & oldAttr )

Removes the attribute oldAttr from the element and returns it.

See also attributeNode() and setAttributeNode().

### void QDomElement::setAttribute ( const QString & name, const QString & value )

Sets the attribute with the name name to the string value. If the attribute does not exist, a new one is created.

### void QDomElement::setAttribute ( const QString & name, double value )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

### void QDomElement::setAttribute ( const QString & name, int value )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

### void QDomElement::setAttribute ( const QString & name, uint value )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

### QDomAttr QDomElement::setAttributeNode ( const QDomAttr & newAttr )

Adds the attribute newAttr to this element.

If an attribute with the name newAttr exists in the element, the function returns this attribute; otherwise the function returns a null attribute.

See also attributeNode().

### void QDomElement::setTagName ( const QString & name )

Sets the tag name of this element.

See also tagName().

### QString QDomElement::tagName () const

Returns the tag name of this element. For an XML element like

      <img src="myimg.png">

the tagname would return "img".

See also setTagName().

### QString QDomElement::text () const

Returns the text contained inside this element.

Example:

      <h1>Hello <b>Qt</b> <![CDATA[<xml is cool>]]></h1>

The function text() of the QDomElement for the <h1> tag, will return "Hello Qt <xml is cool>".

Comments are ignored by this function. It evaluates only QDomText and QDomCDATASection objects.

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