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authorQt Continuous Integration System <qt-info@nokia.com>2011-02-10 06:17:37 (GMT)
committerQt Continuous Integration System <qt-info@nokia.com>2011-02-10 06:17:37 (GMT)
commitabb425e3db6c20c5271788cb1ec4e1fe37b9ea5b (patch)
tree86b68eb00cd024dc7e6293dcf8329f300c83af48 /doc/src/declarative/javascriptblocks.qdoc
parentfd3b8a0e008dd00e363ac173a2cfcabcab31c454 (diff)
parent27b71c5b0b432235da1931ae830e9ad52ee450e7 (diff)
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Merge branch 'qt-master-from-4.7' of scm.dev.nokia.troll.no:qt/qt-integration into master-integration
* 'qt-master-from-4.7' of scm.dev.nokia.troll.no:qt/qt-integration: (182 commits) Fixes XPASS Revert part of commit 7c1ab9b6a8 Fixed wrong casing of a Symbian library. Fixed wrong static library extension on Symbian. Fixed library casing. Remove dependencies to pre-Symbian3 platforms from Symbian3 packages My changes 4.7.2 Don't accept input methods when a TextEdit or TextInput is read only. Correct error message On windows xp using a higher port makes the declarativedebug* tests work Correct assert Fix qt.sis platform dependencies for Symbian^3 builds. Fix few QFileDialog static method issues in Symbian^3 Update QDeclarative DEF files for Symbian Export QDeclarativeRefCount so that symbian compiles. Make Flickable's wheel handling more like QAbstractScrollArea. Changing header or footer failed to delete the previous. Avoid index-out-of bounds related crash in Grid Move Qt.application docs into Qt global object page Add initial size to ListView in FolderListModel example ...
Diffstat (limited to 'doc/src/declarative/javascriptblocks.qdoc')
-rw-r--r--doc/src/declarative/javascriptblocks.qdoc42
1 files changed, 10 insertions, 32 deletions
diff --git a/doc/src/declarative/javascriptblocks.qdoc b/doc/src/declarative/javascriptblocks.qdoc
index d221205..65877f9 100644
--- a/doc/src/declarative/javascriptblocks.qdoc
+++ b/doc/src/declarative/javascriptblocks.qdoc
@@ -200,37 +200,12 @@ Likewise, the \l {Component::onDestruction} attached property is triggered on
component destruction.
-\section1 Property Assignment vs Property Binding
+\section1 JavaScript and Property Binding
-When working with both QML and JavaScript, it is important to differentiate between
-QML \l {Property Binding} and JavaScript value assignment. In QML, a property
-binding is created using the \e {property: value} syntax:
+Property bindings can be created in JavaScript by assigning the property with a \c function
+that returns the required value.
-\code
-Rectangle {
- width: otherItem.width
-}
-\endcode
-
-The \c width of the above \l Rectangle is updated whenever \c otherItem.width changes. On the other
-hand, take the following JavaScript code snippet, that runs when the \l Rectangle is created:
-
-\code
-Rectangle {
-
- Component.onCompleted: {
- width = otherItem.width;
- }
-}
-\endcode
-
-The \c width of this \l Rectangle is \e assigned the value of \c otherItem.width using the
-\e {property = value} syntax in JavaScript. Unlike the QML \e {property: value} syntax, this
-does not invoke QML property binding; the \c rectangle.width property is set to the value
-of \c otherItem.width at the time of the assignment and will not be updated if that value
-changes.
-
-See \l {Property Binding} for more information.
+See \l {Binding Properties from JavaScript} for details.
\section1 Receiving QML Signals in JavaScript
@@ -315,10 +290,13 @@ This restriction exists as the QML environment is not yet fully established.
To run code after the environment setup has completed, refer to
\l {Running JavaScript at Startup}.
-\o The value of \c this is currently undefined in QML
+\o The value of \c this is currently undefined in QML in the majority of contexts
+
+The \c this keyword is supported when \l {Binding Properties from JavaScript}
+{binding properties from JavaScript}. In all other situations, the value of
+\c this is undefined in QML.
-The value of \c this is undefined in QML. To refer to any element, provide
-an \c id. For example:
+To refer to any element, provide an \c id. For example:
\qml
Item {