Viadeo Twitter Google Bookmarks ! Facebook Digg del.icio.us MySpace Yahoo MyWeb Blinklist Netvouz Reddit Simpy StumbleUpon Bookmarks Windows Live Favorites 
Logo Documentation Qt ·  Page d'accueil  ·  Toutes les classes  ·  Classes principales  ·  Annotées  ·  Classes groupées  ·  Fonctions  · 

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


Detailed Description

The QDomElement class represents one element in the DOM tree.

Elements have a tagName() and zero or more attributes associated with them. The tag name can be changed with setTagName().

Element attributes 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. Attributes can be removed with removeAttribute(). There are namespace-aware equivalents to these functions, i.e. setAttributeNS(), setAttributeNodeNS() and removeAttributeNS().

If you want to access the text of a node use text(), e.g.

    QDomElement e = //...
    //...
    QString s = e.text()
    
The text() function operates recursively to find the text (since not all elements contain text). If you want to find all the text in all of a node's children, iterate over the children looking for QDomText nodes, e.g.
    QString text;
    QDomElement element = doc.documentElement();
    for( QDomNode n = element.firstChild(); !n.isNull(); n = n.nextSibling() )
    {
        QDomText t = n.toText();
        if ( !t.isNull() )
            text += t.data();
    }
    
Note that we attempt to convert each node to a text node and use text() rather than using firstChild().toText().data() or n.toText().data() directly on the node, because the node may not be a text element.

You can get a list of all the decendents of an element which have a specified tag name with elementsByTagName() or elementsByTagNameNS().

For further information about the Document Object Model see http://www.w3.org/TR/REC-DOM-Level-1/ and http://www.w3.org/TR/DOM-Level-2-Core/. For a more general introduction of the DOM implementation see the QDomDocument documentation.

See also XML.


Member Function Documentation

QDomElement::QDomElement ()

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

QDomElement::QDomElement ( const QDomElement & x )

Constructs a copy of x.

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

QDomElement::~QDomElement ()

Destroys the object and frees its resources.

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

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

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

QString QDomElement::attributeNS ( const QString nsURI, const QString & localName, const QString & defValue ) const

Returns the attribute with the local name localName and the namespace URI nsURI. If the attribute does not exist defValue is returned.

See also setAttributeNS(), attributeNodeNS(), setAttributeNodeNS(), and attribute().

QDomAttr QDomElement::attributeNode ( const QString & name )

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

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

QDomAttr QDomElement::attributeNodeNS ( const QString & nsURI, const QString & localName )

Returns the QDomAttr object that corresponds to the attribute with the local name localName and the namespace URI nsURI. If no such attribute exists a null attribute is returned.

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

QDomNamedNodeMap QDomElement::attributes () const [virtual]

Returns a QDomNamedNodeMap containing all this element's attributes.

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

Reimplemented from QDomNode.

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

Returns a QDomNodeList containing all descendent elements of this element that are called tagname. The order they are in the node list is the order they are encountered in a preorder traversal of the element tree.

See also elementsByTagNameNS() and QDomDocument::elementsByTagName().

QDomNodeList QDomElement::elementsByTagNameNS ( const QString & nsURI, const QString & localName ) const [virtual]

Returns a QDomNodeList containing all the descendent elements of this element with the local name localName and the namespace URI nsURI. The order they are in the node list is the order they are encountered in a preorder traversal of the element tree.

See also elementsByTagName() and QDomDocument::elementsByTagNameNS().

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

Returns TRUE if this element has an attribute called name; otherwise returns FALSE.

bool QDomElement::hasAttributeNS ( const QString & nsURI, const QString & localName ) const

Returns TRUE if this element has an attribute with the local name localName and the namespace URI nsURI; otherwise returns FALSE.

bool QDomElement::isElement () const [virtual]

Returns TRUE.

Reimplemented from QDomNode.

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

Returns ElementNode.

Reimplemented from QDomNode.

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

Assigns x to this DOM element.

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

void QDomElement::removeAttribute ( const QString & name )

Removes the attribute called name name from this element.

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

void QDomElement::removeAttributeNS ( const QString & nsURI, const QString & localName )

Removes the attribute with the local name localName and the namespace URI nsURI from this element.

See also setAttributeNS(), attributeNS(), and removeAttribute().

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 )

Adds an attribute called name with value value. If an attribute with the same name exists, its value is replaced by value.

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

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

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

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

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

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

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

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

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

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

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

void QDomElement::setAttributeNS ( const QString nsURI, const QString & qName, const QString & value )

Adds an attribute with the qualified name qName and the namespace URI nsURI with the value value. If an attribute with the same local name and namespace URI exists, its prefix is replaced by the prefix of qName and its value is repaced by value.

Although qName is the qualified name, the local name is used to decide if an existing attribute's value should be replaced.

See also attributeNS(), setAttributeNodeNS(), and setAttribute().

void QDomElement::setAttributeNS ( const QString nsURI, const QString & qName, int value )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

void QDomElement::setAttributeNS ( const QString nsURI, const QString & qName, uint value )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

void QDomElement::setAttributeNS ( const QString nsURI, const QString & qName, long value )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

void QDomElement::setAttributeNS ( const QString nsURI, const QString & qName, ulong value )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

void QDomElement::setAttributeNS ( const QString nsURI, const QString & qName, double value )

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

QDomAttr QDomElement::setAttributeNode ( const QDomAttr & newAttr )

Adds the attribute newAttr to this element.

If the element has another attribute that has the same name as newAttr, this function replaces that attribute and returns it; otherwise the function returns a null attribute.

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

QDomAttr QDomElement::setAttributeNodeNS ( const QDomAttr & newAttr )

Adds the attribute newAttr to this element.

If the element has another attribute that has the same local name and namespace URI as newAttr, this function replaces that attribute and returns it; otherwise the function returns a null attribute.

See also attributeNodeNS(), setAttributeNS(), and setAttributeNode().

void QDomElement::setTagName ( const QString & name )

Sets this element's tag name to name.

See also tagName().

QString QDomElement::tagName () const

Returns the tag name of this element. For an XML element like this:
    <img src="myimg.png">
    
the tagname would return "img".

See also setTagName().

QString QDomElement::text () const

Returns the element's text or QString::null.

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 only evaluates QDomText and QDomCDATASection objects.


This file is part of the Qt toolkit. Copyright © 1995-2003 Trolltech. All Rights Reserved.

Publicité

Best Of

Actualités les plus lues

Semaine
Mois
Année
  1. « Quelque chose ne va vraiment pas avec les développeurs "modernes" », un développeur à "l'ancienne" critique la multiplication des bibliothèques 94
  2. Apercevoir la troisième dimension ou l'utilisation multithreadée d'OpenGL dans Qt, un article des Qt Quarterly traduit par Guillaume Belz 0
  3. Les développeurs ignorent-ils trop les failles découvertes dans leur code ? Prenez-vous en compte les remarques des autres ? 17
  4. Pourquoi les programmeurs sont-ils moins payés que les gestionnaires de programmes ? Manquent-ils de pouvoir de négociation ? 42
  5. Quelles nouveautés de C++11 Visual C++ doit-il rapidement intégrer ? Donnez-nous votre avis 10
  6. Adieu qmake, bienvenue qbs : Qt Building Suite, un outil déclaratif et extensible pour la compilation de projets Qt 17
  7. 2017 : un quinquennat pour une nouvelle version du C++ ? Possible, selon Herb Sutter 8
Page suivante

Le Qt Labs au hasard

Logo

Utiliser OpenCL avec Qt

Les Qt Labs sont les laboratoires des développeurs de Qt, où ils peuvent partager des impressions sur le framework, son utilisation, ce que pourrait être son futur. Lire l'article.

Communauté

Ressources

Liens utiles

Contact

  • Vous souhaitez rejoindre la rédaction ou proposer un tutoriel, une traduction, une question... ? Postez dans le forum Contribuez ou contactez-nous par MP ou par email (voir en bas de page).

Qt dans le magazine

Cette page est une traduction d'une page de la documentation de Qt, écrite par Nokia Corporation and/or its subsidiary(-ies). Les éventuels problèmes résultant d'une mauvaise traduction ne sont pas imputables à Nokia. Qt 3.2
Copyright © 2012 Developpez LLC. Tous droits réservés Developpez LLC. Aucune reproduction, même partielle, ne peut être faite de ce site et de l'ensemble de son contenu : textes, documents et images sans l'autorisation expresse de Developpez LLC. Sinon, vous encourez selon la loi jusqu'à 3 ans de prison et jusqu'à 300 000 E de dommages et intérêts. Cette page est déposée à la SACD.
Vous avez déniché une erreur ? Un bug ? Une redirection cassée ? Ou tout autre problème, quel qu'il soit ? Ou bien vous désirez participer à ce projet de traduction ? N'hésitez pas à nous contacter ou par MP !
 
 
 
 
Partenaires

Hébergement Web